These pipes you see here in this video were made from scratch with a few U-bends and straight pieces of mandrel bent steel exhaust piping. Aluminum would be lighter but its much harder to weld and powercoat. The CM Kit would probably fit fine if you were using the stock turbo or something not much bigger than stock. It's been 2 years since I tried it; maybe they've improved the design since then.
The MAF measures the amount of air going into the engine. The ECU takes this signal and injects a certain amount of fuel based on that. If you vent air to the atmosphere, the engine is getting less air than the ECU expects, so the mixture will be rich when you are shifting. Not a big deal at this level but the chance to recirculate was there and I did it
Getting the injectors put in this weekend and I have a tune ready for it. I think the car will finally be "ready" in a couple of days. I still need a stronger clutch to hold all that power though. But it'll take some time to save up the money.
@christom On the passenger side of the intake manifold, towards the front of the car, is a popoff valve that will release pressure if it gets too high above stock. You need to remove that valve and replace it with the plug the non-turbo cars have in its place (or some other plug that fits)
I finished my injectors today and I've set the boost to 12 PSI while I start tuning the car. Ultimately I want to run around 18-20 PSI, but I'll still need a clutch to hold that much.
From what I understand, lightweight pulleys only add a handful of HP. I don't know if I want to underdrive my accessories and get rid of the harmonic balancer for a minor improvement. And I've have to get the custom made in anycase as unorthodox pulleys are long discontinued. I hope to make around 400 RWHP, I'll need a better clutch to get there though.
Technical answer to why I did this: On a MAF based system, it's better to have the air that the MAF has metered actually going into the intake to be combusted rather than being vented into the atmosphere (recirculation). Otherwise you'll end up with a rich condition whenever you are shifting. Real answer to why I did this: I did this to muffle to "whoosh" noise, which I quickly found annoying driving my friends car.
Was your car originally a turbo? The VIN will start with JN1C if it was. If it was not, showing JN1H, the original owner may have converted the original NA motor to turbo, in which case you have a turbo'ed 9:1 compression motor. That would explain the increased power. The 87 W turbo motor is rated the same power from the factory as the older engines. They didn't change the compression ratio. Of course it's possible to make 300 with 10 PSI, just not with the stock turbo.
yo great job i got a z31 87 na ...bt i just got a turbo motor i wanna drop in it ...u got ant tips or anything i need to know so it all works out good,..
Some say the stock turbo is too small for a 3 liter V6, especially if you want lots of boost. If you're only going slightly bigger, then an electronic boost controller would probably more than make up for whatever extra lag you're introducing.
Hey I'm getting a 1985 Z31 turbo and I'm planning to install an intercooler. I am aware of all the parts i need (I researched them from your videos) but im still in the dark about the intercooler piping. Since the cm performance intercooler piping kit didn't fit properly, did you rebend the kit pipes to accomodate the spacing and bends? Please Respond as I might be ordering the parts soon. Thanks!
And what car would you say is "fast". There are Z31's in the 7, 8, and 9 second (1/4 mi)range (videos of which can be found right here on YT). But I could never afford to get my car that powerful, though.
good job on your piping, only one who goes thru the fabrication can actually appreciate ones hard labor, screw these ricer kids whos only transportation is their moms saturn.
@charlie514 My car has a boost leak somewhere, and I've spent about 2 months trying to find it with no success...it's getting cold here now so I have to put it away, and I can't really afford a pro (and who is a pro with these cars really, after 20 years) to look at it for me. I wish there were something good to show for all this work!
300 WHP with the stock turbo? I don't see how that would be possible...the stock turbo loses efficiency at around 1 bar of pressure, and that's not anywhere near enough to get 300. The stock system only adds about 40 HP at 7 PSI. How will you get another 100HP with only 7 more pounds of pressure? The stock turbo is too small.
These pipes you see here in this video were made from scratch with a few U-bends and straight pieces of mandrel bent steel exhaust piping. Aluminum would be lighter but its much harder to weld and powercoat. The CM Kit would probably fit fine if you were using the stock turbo or something not much bigger than stock. It's been 2 years since I tried it; maybe they've improved the design since then.
The MAF measures the amount of air going into the engine. The ECU takes this signal and injects a certain amount of fuel based on that. If you vent air to the atmosphere, the engine is getting less air than the ECU expects, so the mixture will be rich when you are shifting. Not a big deal at this level but the chance to recirculate was there and I did it
Good tip with the poly mounts.
On the front of the plenum there's a vacuum hose that goes to the fuel pressure regulator. I used a T fitting off that line to connect to the BOV
Getting the injectors put in this weekend and I have a tune ready for it. I think the car will finally be "ready" in a couple of days. I still need a stronger clutch to hold all that power though. But it'll take some time to save up the money.
@christom On the passenger side of the intake manifold, towards the front of the car, is a popoff valve that will release pressure if it gets too high above stock. You need to remove that valve and replace it with the plug the non-turbo cars have in its place (or some other plug that fits)
I finished my injectors today and I've set the boost to 12 PSI while I start tuning the car. Ultimately I want to run around 18-20 PSI, but I'll still need a clutch to hold that much.
whats the litte hose for on top of the blow off valve?
nice vid and good explaining .
i too want too build a intercooler on my z31.
nice video man! you should post this on some of the z21 forums!
From what I understand, lightweight pulleys only add a handful of HP. I don't know if I want to underdrive my accessories and get rid of the harmonic balancer for a minor improvement. And I've have to get the custom made in anycase as unorthodox pulleys are long discontinued. I hope to make around 400 RWHP, I'll need a better clutch to get there though.
Wow...This is pure inspiration.
I have an 86' N/A z31 2+2. and i now
im saving money to buy piece by piece.
Whats the total psi now??
could you post a video please about your turbo cooler.......the oil cooler
Here in aus it is illegal to vent to atmosphere anyways so good job mate.
want to see a update please, how the car been
@christom That was answered in another comment - the piping kit is made for turbos not much larger that stock. Mine was too big
Technical answer to why I did this: On a MAF based system, it's better to have the air that the MAF has metered actually going into the intake to be combusted rather than being vented into the atmosphere (recirculation). Otherwise you'll end up with a rich condition whenever you are shifting. Real answer to why I did this: I did this to muffle to "whoosh" noise, which I quickly found annoying driving my friends car.
Was your car originally a turbo? The VIN will start with JN1C if it was. If it was not, showing JN1H, the original owner may have converted the original NA motor to turbo, in which case you have a turbo'ed 9:1 compression motor. That would explain the increased power. The 87 W turbo motor is rated the same power from the factory as the older engines. They didn't change the compression ratio. Of course it's possible to make 300 with 10 PSI, just not with the stock turbo.
yo great job i got a z31 87 na ...bt i just got a turbo motor i wanna drop in it ...u got ant tips or anything i need to know so it all works out good,..
Some say the stock turbo is too small for a 3 liter V6, especially if you want lots of boost. If you're only going slightly bigger, then an electronic boost controller would probably more than make up for whatever extra lag you're introducing.
Hey I'm getting a 1985 Z31 turbo and I'm planning to install an intercooler. I am aware of all the parts i need (I researched them from your videos) but im still in the dark about the intercooler piping. Since the cm performance intercooler piping kit didn't fit properly, did you rebend the kit pipes to accomodate the spacing and bends?
Please Respond as I might be ordering the parts soon.
Thanks!
And what car would you say is "fast". There are Z31's in the 7, 8, and 9 second (1/4 mi)range (videos of which can be found right here on YT). But I could never afford to get my car that powerful, though.
so does the hose just go to the bottom of the bov?
What brand is your intercooler and how much did it cost?... I had a z31 as well and I made my intercooler setup but your looks much nicer...
did you have a clutch fan as well as a dual electric fans?
Hey I like your tight work with piping. I am fabricating pipings to my Z and I am also keeping the AC system along...
It goes back into the intake pipe right after the MAF
Stock, it came with the POV. I removed it and used a plug from a N/A motor.
good job on your piping, only one who goes thru the fabrication can actually appreciate ones hard labor, screw these ricer kids whos only transportation is their moms saturn.
how many psi are you running in this vid, and what is a POV?
@voodooblock17 No, clutch fan is gone. You need all that space
@charlie514 My car has a boost leak somewhere, and I've spent about 2 months trying to find it with no success...it's getting cold here now so I have to put it away, and I can't really afford a pro (and who is a pro with these cars really, after 20 years) to look at it for me. I wish there were something good to show for all this work!
which country your in?
nice ty wraps dude! Just kidding. Been there done that. gonna recirc my sr soon. Fun at first, annoying after about ten min.
300 WHP with the stock turbo? I don't see how that would be possible...the stock turbo loses efficiency at around 1 bar of pressure, and that's not anywhere near enough to get 300. The stock system only adds about 40 HP at 7 PSI. How will you get another 100HP with only 7 more pounds of pressure? The stock turbo is too small.
Yeah I know. The first time I did it I used it ALOT more. So I did it over to try and not use it but I get caught up and forget. Alright?
Alright is said 26 times in this 6 minute video ...
It won't work with a turbo much bigger than stock
i have a vg30et with around 60,000 miles on it...anybody who is interested send me a messege...