Ultimate TBI Mods: Adjustable Fuel Pressure Regulator
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- Опубліковано 15 жов 2021
- How to install an adjustable fuel pressure regulator on a GM TBI system
this gives you the ability to adjust fuel pressure and fix the low pressure the factory system can give out. the result is better fuel economy and horsepower.
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I did the adjustable regulator/spacer on my sons Camaro. We knew the 305 was coming out of the car, but we kept tweaking on it, and made several passes down the quarter mile to see what we gained. By far, the biggest gain we achieved, to the tune of knocking 4 tenths of his ET, was installing a 3 inch open element air cleaner! (Get the flat base, not the drop base. It will clear the hood)... Now I had some keyboard genius argue that the open element would be worse, (blah blah blah) by letting hot air in the throttle body. ANY air is better than no air, and ET slips don't lie!
What your model Camaro release? I want one of those air cleaners to put on my truck to plumb out for actual cold air intake
I had not done the regulator change to adjustable but I say to get more power with a high volume fuel pum-run 5.7L tbi injectors, and install roller tip rocker arms 3/8 × 1.6...I too have a 88 Iroc-Z 5.0 5 speed...runs really good. Done this mod to my 94 Z71 350 X-Cab...it runs quicker. O ya Hawks Motorsports sells open hood louvers to extract under hood heat, while bringing in cool air under the hood
92 here I'm going to try the triangle air cleaner from edelbrock.
@@Aceman597 Save your money, those air cleaners are junk! If your engine backfires one time, it will set the foam filter on fire. Summit sells the round open element air cleaners with a filter for 30 bucks.
It will choke most things to death.v@@Aceman597
This video is soo professionally done. THANK YOU!
Good sound, good light and focus. The commentary is stellar in concise delivery..
Agreed 100% Absolute professional quality video and clear instruction!
So this would be a bust ? Glad I didn,t waste my time and money ,professional or not
This will be great for my 93’ Buick Road Master project 🔧
@ 3rd Gen Guy, I've been doing a lot of research on ways to upgrade and or modify a TBI for more fuel pressure/volume and more CFM's for a 1988 GMC Sierra SLE 4X4 auto trans with basically a stock 5.7L 350cid with flat top 9:1 compression Wheeler pistons, upgraded camshaft to a Comp Cam CL12-256-4, new lifters and springs, Holley Headers long tube 1-5/8 tubes to 3 inch collectors with CO2 sensor bung, 2-1/2 exhaust piping and dual Flowtech Raptor mufflers, cold air intake, 180 degree thermostat, swirl spacer between intake manifold and TBI, dual electric radiator/condenser cooling fans, replaced the pickup stator in distributor while I had it out, I ported my heads exhaust and matched intake to manifold, I did the grind and polish on TBI, thicker injector pod spacer, 14-18 psi regulator spring in TBI, but my present TBI stock fuel pump is barely putting out 11 psi fuel pump pressure, but I'd read an another platform that any type of fuel injected gas engine that's making over 230 horsepower needs to have a fuel pump upgrade, and they recommended the ACDelco in tank electric fuel pump, pn# 25163473, Summit Racing pn# ADO-EP381 $141.99, don't forget to replace the strainer, this fuel pump produces at least 60psi, therefore, you'll have plenty of fuel pressure for whatever type of fuel injection you have, the regulator will control the fuel pressure. I'd also read for the TBI units, you can regulate your fuel pressure to as much as 14 psi, but don't go any higher. Most stock TBI fuel pumps average about 10-12 psi, and one psi makes a big difference in fuel injection and high performance engines. Lastly, I'm gonna research to see if a larger/higher volume fuel injectors and MAP sensor upgrades might be needed for my engine build, along with, I'm gonna see about a specific computer chip for my setup with tbichips.com. Thanks for the video for the add on fuel regulator, I may very well do this on my TBI, especially for the upgraded 60 psi fuel pump.
Get that AC-Delco unit--it will likely fix your fuel delivery issue. I bought one for my '91 K1500, but I just put a (stock) rebuilt TBI unit on the engine. Mods are coming, later. Also, if the guy posting this video who says he has a TBI rebuild video didn't replace the throttle shaft bushings, the TBI unit is going to be "sucking air," something mine used to do. NO power or performance, after the previous owner put an Edelbrock aluminum intake and spacer under the TBI unit, as well as a better cam. After I replaced the TBI with one that was TOTALLY rebuilt, (including throttle shaft bushings) I could finally feel it pulling better, even with just 3.42 gears in the diffs.
If I’m seeing what I’m seeing
This was redundant because once you first installed the gauge it is pre the adjustable fuel regulator, so that should be the immediate tell tale that your fuel pump is maxed out at what the first reading shows. The only way the regulator works is to dampen or “retard” fuel pressure beyond the pumps max capacity. The regulator will not increase pressure beyond what the pump puts out.
I’m happy someone else noticed that 😂
Super well done video, a little above my pay grade and motto of if it ain't broke.................. lol
What’s the part number for the adapter to add the pressure gauge?
I dont know why but sometimes the hole is already in the throttle body and you dont have to drill it for the screw. Also to remove the injector pod you can get away with only removing one fuel fitting.
My thoughts on inching the fuel pressure up:
There is a long way from the in-tank pump to the fuel pressure measuring point. There are quite a few kinks on the original line, and the diameter is as small as GM could get away with.
every kink detracts a little line pressure. Increasing the diameter of the fuel line, most of the way, will open up flow, minimizing pressure drop. Just a thought.
Install a measurement point near the pump, would of course show if there are any gains to expect.
the stock fuel feed line is 3/8in hardline.
there's been guy who made 1,000hp from stock 3/8 lines.
it's usually the fuel pump that';s the limiting factor.
really wish there was part numbers
Never realized your car was auto. Great video by the way.
It'll be a LS1/T56 Magnum soon
I really hate automatics
@@3rdGenGuy yanking out my 305 tune port / T5 from my 92 Z28 and have the LS7 / T56 ready to go in. Just wana see how you do it first as far as mounts,k member, accessories to learn from your errors lol. I'll be watching.
@@JBZ28LS7 I was eyeballing that new GM 570hp LS7 crate motor, but I'm unsure how well my Autocross built suspension will put down power. a 400hp ls1 is good enough for now.
Yeah mine is the 505 HP one. My build is both autocross and drag racing compromising a bit in the drag racing side. Your build is great motivation and has helped me plan about some part selection. Keep it up. These platforms are limited gata work with what fits in the wheel wells and truck steering lmaoo
I've got a completely rebuilt TBI setup for a 350, manifold, Distributor, 193 64cc ported heads w/ SS valves new seals etc, I switched to a carb. I need money for surgery and need to get rid of some parts if your interested.
Hello, please write part numbers of fitting and manometer. Thank you.
Any recommendations for a fuel pressure gauge for 1994 GM 454 TBI? Fuel pressure on my RV is 26-32psi. FYI...at 11:05 your forgot to mention installing the TBI base gasket. best to install the adapter fitting first to make it easier to decide which port to install the gauge in. I don't recommend installing a permanent gauge. The heat will skew the gauge reading with time. Better to install a fuel rated schrader valve in one of the ports.
I don’t miss my TBI 305 in the slightest for my LS1/T56.
I was a cop for 20 years before I got hurt. I had a slick top capris with the LT1-350. I had a pursuit once and my last call out for speed I made was $155 mph. We've been a lot faster but that was the last time I dared looked down at the speedometer. It was stupid and I look back on it and shudder out the what could have been because this was at night and the area where I was was notorious for cattle being out. The guy got away that night after he froggered across four lanes of the main highway in front of 2-18 wheelers and I decided nope. I went the next day and arrested the car!
I call BS you can’t arrest a car
Hi guys
Is it possible to bypass the integrated fuel pressure regulator for using an external type? Thanks
👍
Already watched your rebuild vid. and purchased TBI rebuild kit. Now that winter is starting here in the PNW can bench TBI for my '91 Vert. considering installing this at the same time. Do I order this from Summit, or? Thx
Throttle shaft bushings should be replaced also, or else your TBI unit will be sucking air--aka, vacuum leak. Power will be down, until you do that. I "cheated," and bought a totally rebuilt unit.
I've been watching because I have a ford 300 that is getting a kit from affordable fuel injection that uses this throttle body.
Would it be better to keep, rebuild and upgrade TBI or just do the carb swap if I am going to do work on the engine? I am for sure upgrading the cam and lifters and reolacing springs in heads may also try to swap vortec heads and in the future want to get a drop in 383 kit and rebuild. Not sure if im wasting my time by trying to stick with TBI.
the carb is a better option for future power builds.
a TBI is pretty much capped at 275-300 horsepower.
but TBI really are smooth and reliable.
Hey cool vid, but ah what about the link for the parts eh? I don't see it maybe I need glasses.
I’m trying to do the same for my 454 tbi I was wondering where can I get that fuel pressure regulator and the custom fuel line adapter with the fuel gauge?
a few companies sell them. CFM technologies, summit, jegs ex ex.
@@3rdGenGuy thank you but another question how is it reading what the regulator is pushing out ? Wouldn’t it be reading the fuel pumps pressure since it’s before the regulator and not after?
@@ManuelReyes-dw8ym If I recall correctly it works because the fuel flows through the injectors before it gets to the regulator. The injectors are normally in a state of closed which allows fuel to flow through to the regulator but not out into the intake when closed. So any pressure over 11 psi is released into the return line. Remember injectors themselves do not spit the fuel/create the pressure. They only get energized to open and allow the pressurized fuel to squirt out of them. If you put the gauge after the regulator it would read little to no pressure because there should be no restriction other than the size of the fuel line on the way back o the tank.
So what’s keeping the newly installed pressure screw in place? I heard no mention of tapping threads into the throttle body.
the spring housing is threaded.
You don’t have to remove brake booster line
Any idea how to remove the idle adjuster plug (?) and install a/the T-27 torx screw? Thank You!
i just drilled into it and it flew out.
Once you get the plug out the screws behind there. You don't have to add a Torx
I would like a bluetooth remote guage into the cab something like that. This way under load throttling if at times you see a drop in pressure to 7 pounds say, you can figure out way, maybe there is enough pressure while your watching but not while driving.
There are Test kit fuel pressure gauges you can buy.
that way you could see fuel pressure while driving.
@@3rdGenGuy I’d like a Bluetooth or a signal transmitting gauge, so I don’t have to plum fuel into the cab. The real classic old cars the gauge that showed a person how much fuel they had was actually a glass and you could see the actual fuel floating in there.
I have a 95 silverado with a 305 what part number or were can i buy this kit from
it's from CFM technologies website.
good discribtion... nice thx...did you adjust the pressure?
mine was at 11psi stock, so I was only able to set it to 11.5psi.
SOME systems are as low as 8psi, so those cars would have a better result.
There's a new spring you can get that takes it to 13-14 psi, anyone tried it? Apparently it's works very well
i did the quarter mod and upped my pressure from 11 to 14. i could tell a big difference
@@andysmith434 what is the quarter mod?
@@dreweddy25 put a quarter under the spring in the fuel pressure regulator. From my experience it raises it about 3 psi.
Im running a 15lb spring. 46mm bored TBI and manifold bored to match. TPI fuel pump for more FP. Custom chip etc.Engine is an L98 out of an Iroc I rebuilt. Does pretty good.
So essentially it’s the same as it was
Hello I could be wrong but your fuel pressure regulator is located after the fuel pressure gauge so it's not going to show a change in fuel pressure.
Great point!! Could have fine pressure from the pump but who knows what the regulator is doing!!!!!!! Dang!!
the port that you had the gauge on had a oring already on it from the first time around
So the pump can't produce more than 11psi. So now we know this is a wasted exercise. Thanks!!
Stick with a stock regulator.
IDK how many times I have to explain this.
NOT ALL OEM REGULATORS WILL GIVE YOU THE PROPER PSI!!!!!!!!
some 100% new regs with a new pump will give you 8psi
8psi vs 11psi is about 30% fuel flow, a MASSIVE amount.
my car happened to be at the correct psi, MANY of the MILLIONS of TBI cars are much lower than that.
Did you check the o ring on the fuel line itself I have the same problem with mine
it had the correct ring/plastic seal. just bad machining caused a leak.
Please help me find the adapter for the gauge ???
marine-performance-parts.com/
And now the supercharger
Very good video I use Teflon on gas lines 👌
if this is a joke thats a good one
@@laudennn no its not a joke wrf you talking about
@@badassbees3680 Gas eats Teflon tape. Use Permatex 2
Just what I was waiting for the audio got quiet. At 13;25 is the part that I need, but I don't know what it's called. I took pictures and no one knows at the part stores. Please someone tell me what that ring is called.
you mean the "Air Cleaner Mounting Gasket"
same size as any carburetor.
like $4 online as well
also comes with the TBI rebuild kits if you buy one.
@@3rdGenGuy Thanks. I literally just found out what it was called. Yes that is what I was talking about. 😊. Getting the part in the morning.
Fuel pressure should hold key off. I think your fuel pump isolator is leaking, replace it with fi hose.
my old TBI fuel pump was some $30 eBay special so that's probably why lol.
never caused issues though.
Tbi gm have a bleed in the fpr so they dont hold pressure and they dont have a check valve in the fuel feed side
Gm TBI doesn't hold fuel psi as per its design. You could possibly add in a valve downstream to make it hold psi as the TPI units do but its needed.
I have a question, how much do you think an LS1/T56 swap would cost if I paid someone for the labor?
depends on the shop, but a LOT!
most shops are charging over $100 an hour for labor these days.
that ans a LS1 and T56 are gonna set you back $4-5K on the low end.
it isn't cheap unfortunately.
@@3rdGenGuy I'm in Central Texas. I work on outboards I am not a certified outboard mechanic but I have about 20 years experience doing it. I charge $130 an hour I spoke with my friend who owns a shop real close to me he charges 175 an hour and is going up just like with everything right now. He said most shops charge between $150 and $250 an hour
Did you realign the inlet line in after installing the adapter? The adapter is longer than the OE one which will alter the line angle coming in. Likely enough that the O-ring isn't able to seal. Line needs to come in as straight as possible. You can follow the line back to the first bracket and disconnect it which likely will give you some wiggle room.
the hard line was bent to fit.
the adaptor was just a smidge off machining wise.
@@3rdGenGuy I bought the same one and just installed it on the TBI. We'll find out here shortly if it works. Install is tomorrow. I opted to add a fuel schrader valve on mine..
@@3rdGenGuy Know where the machining mistake was? And did you notify the machinist/maker?
@@3rdGenGuy Update: Installed my TBI and after several minutes of run time...leaks at the pipe plug and the schrader valve threads. Permatex 2 used.
it's annoying, but set the psi and probably just remove the fitting like I did.
Might be crazy but if it’s leaking with the gauge. Get some good thread tape like you use on a shower head to keep the water from leaking.
the machined adapter leaked at the nylon gasket.
wouldn't stop leaking, so I just set the fuel pressure and removed the adapter.
You cannot use "shower head" Teflon on gasoline application. It melts. There are some specialty sealant tapes that are specifically made for petroleum applications (they are typically colored yellow), but definitely DO NOT use standard Teflon tape.
might be crazy but why even do the shit to begin with pretty damn pointless and plus if your going to have it apart rebuild the whole tbi put new orings and screens in injectors. dumb video it wont accompish a damn thing
@@3rdGenGuy Leak appears to be from the inlet line. Likely a torn o-ring. Use only Viton o-rings. Leak started after second removal of inlet. The nylon seal needs replacing anytime the fitting is removed (1 time use).
Knowing what pressure the pump is giving the TBI is great but how do we know what the regulator is sending to the injectors. You now have it adjustable without any way of knowing what it is???
it's the same pressure.
what that gauge is reading, is what the TBI injectors are getting fed.
Does this mod help with the map sensor pushing too much fuel? I have a 93 350 with a mild cam and I'm having issues flooding out...
unfortunately trich running could be a million things.
@@3rdGenGuy ive changed out the TPS, IAC, temp sensor, 3 diff MAP sensors, new brake booster just to be sure ( for vacuum reasons) and still wants to flood
@@shawncarney8691 did you find a solution for your problem ?
l have the same problem , i changed the fuel pump to after market one as a look like oem one now it's flooding , i am in doubt maybe it's putting more than pressure it needs .need to put a gauge to check the pressure .
but is is it possible changing to more power fuel pump rise's the pressure ?
@@shawncarney8691 Fuel regulator spring is likely issue.
@@biohazardworkshop1758 was told that a custom chip burned for my specs would fix the issue but have pulled the trigger on it yet
Can you leave this gauge system connected? And where can i get one for my 87 chevy 350?
you can leave it connected,
CFM technologies sells kits, so does Jegs and summit racing.
Brutal, thanks for sharing this with us all. I'am going to put this on my 87 chevy silverado v10 5.7 tbi so I can check the pressure off and on. Do you have any advice for troubleshooting hot hard start for a 350 tbi?
you just as well as buy a rebuild kit put new o rings and screens and everything in the injectors your already there
ua-cam.com/video/XfQ5-a3sRKk/v-deo.html
What does increased fuel pressure do for this TBI setup?
sets fuel flow to where It should be at.
Do you happen to know if this mod will pass emissions (smog)?
there is no reason why it shouldn't.
the mod brings fuel pressure back up to where it should be.
Cool, but what good is the mod if it is going to leak.Couldn’t even use the gauge.
that's how cars go man.
Where did you get that adapter???
CFM technologies.
although I think Jegs also sells one.
Where do u get that kit
CFM technologies.
You remember what kind of adapter that is that the fuel pressure gauge is going into ?
CFM technologies sells them. don't know the thread pitch or anything like that.
Just get a fuel pump for a 97 c1500 and you will have plenty
After all this, did you manage to increase the fuel pressure at all or was it already at its peak before installing the adjustable fitting?
He said it was already at its peak
Mine was unfortunately basically right in the money as is.
Some systems are as low as 8psi stock. This video took forever, so I wasn't gonna not release it ha ha
@@3rdGenGuy Okay, got it, thanks!
Where do I get this kit?
CFM technologies sells them.
It looks like your injectors are shot. I don't think they should be spraying that much fuel, should be a fine mist instead. I had that same issue with my 93 GMC. You might get more fuel pressure if your injectors were replaced with ones that spray correctly.
minelooklikethatimgunnareplacethemsorrynospacebar:(
@@Ozzy920 Joe Biden is that you
@@ianwillmott3408 lmao.....funny af!!
Change it to a 4bbl carburetor or EFI. Too much trouble on a TBI.
TBI run great if cared for.
off-road guys replaced Carbs with TBI units back in the day because they aren't affected by elevation change or high angle of attacks.
What benefits does higher or lower fuel pressure provide and why did you want it adjustable?
GM had a 8-12psi acceptable range for fuel pressure. That's an insane difference in potential power if your car is stuck at 8psi. Mine was actually fine, but I did the video anyways.
@@3rdGenGuy what are the parts numbers for the fuel line and gauge assembly and the adjustable fuel pump regulator
@@3rdGenGuy 1994-1995 TBI 454 had 26-32psi fuel pressure.
We’re u buy that part
I think Jegs, summit and CFM technologies sell them still.
Do you have links to the products talked about in this video?
marine-performance-parts.com/
What are the specific part numbers?
If this mod is before the pressure regulator, how can changing the spring raise the fuel psi?
t.y.
У меня на 4.3 показывает давление 0 ,но работает
Поправка,теперь все работает в штатном режиме,оказывается питание насоса было напрямую от замка
So pretty much you did all that for nothing good job
the video makes money, so it's not all for nothing ha ha.
I wonder why the 454 needs a 20 plus # pressure.I have a 94 454 that i suspect has a weak pump
@@williamreilly8520 the 454 TBI ran at a higher pressure than the 305 and 350s.
Stop using a knife to clean gasket edges, use a dremel with a wirewheel; goes by A HECK of a lot faster lol ta ta 👋
not a fan of wire wheels.
I always end up with metal wires sticking into my body ha ha
How is fuel mileage affected if you raise your fuel pressure from 9 to 12?
shouldn't change at all.
unless ur tbi was in really bad shape.
Then MPG would increase
@@3rdGenGuy interesting. Thanks for the video. 👍
so you spent how much money and all the time to do this and you get the same pressure as you did before ? maybe if you want more pressure you need a pump that puts out more pressure to start with in the first place . SO what did we learn here ? CAN ANYONE PLEASE EXPLAIN ??
again, SOME cars are below 8psi.
mine happened to be within the upper range.
@@3rdGenGuy again, SOME videos should be made and a lot of them shouldn't .
again, SOME comments should be made and a lot of them shouldn't .
@@3rdGenGuy and yet YOU made the video
"and yet YOU made the comment"
so what the hell was the purpose the pump can only supply so much thats def a waste of time in my books
GM TBI engines run better at higher (correct) fuel pressures. the factory pressure is usually ALL over the place.
the range was something super wide like 9-14psi
12psi+ ran the best, below had less power and ran worse
Ultimate mod? The regulator leaked and the fuel pressure went from 11 to 11. I'm not sure why we watched this😂😂
that's the thing, Some cars are running at 8psi or lower.
in that case 8psi to 11psi is HUGE a 27% fuel increase.
i went from 10psi to 11, so a 9% increase.
Teflon tape
Not for fuel.
Ultimate TBI mod that didn't work...
A fuel pump from a 96 suburban should fix that problem
I didn't know that at the time, but ya; using a later year pump nets a bit more pressure.
Also a tbi chip
TBI chips are basically a scam. unless someone is burning a chip on the fly just for your car.
been there lol
@3rdGenGuy I was told to go that way but also wear rubber gloves when your touching the chip because it could mess up touching it by hand
Also the injectors are ment for only 12 pounds if you go higher than that they can give out. There is a tbi upgrade but it cost like $2500
another words-- a total waist of time
Some cars don't respond to the mod.
some do.
some cars are at 8 or 9psi. so it's a MASSIVE improvement