Drax240z

PVC piping has a melting point of about 84C if I remember correctly. It won't turn into a puddle at that temperature, but I'd be wary about putting pressure through it. CPVC will get you another few degrees, I think its 94C. You may want to try to measure what engine bay temps you are getting while not moving to see if thats enough. (run the car hard, then park and let it idle to simulate heavy traffic, and then measure temps)

Hehe, have to love those mysterious fixes. Maybe it was a bad seal somewhere? Glad to hear you've got it fixed though.

Jamie, the stock 4 speeds are not that vague. Mine is tight and has good feeling. I believe there is an article on zhome.com about making a new bushing out of brass. The Nylon ones do wear out... I have about 1/2" or less side to side play when in gear.

Holy crap Dan! That looks AWESOME!

Well I've been doing some 3 pc wheel research lately, for our FSAE car. (13" wheels only mind you) Check out Keizer, Fiske, Panasport, Centerline, and BBS. They all make 3 piecers. I really like the Fiske stuff, but its pretty major $$$.

Yeah Pete, I think your car is quite possibly the finest example of a hybridz out there, and I am sure not many that have seen it could disagree. (hell you can tell by the pictures) I'd really like to see the car in a magazine or two!

You mean it has more power than the tercel you've been driving? Glad to hear it! Can't wait to see it.

I'm confused. Too many scotts. The external spring one is a nice solution. You could take off the old wastegate rod, and thread it. Then put on 2 nuts/washer to act as an adjustable spring perch, so you could vary the effect of the spring. Woohoo, coilovers for your turbo!

Music to my ears! Can't wait to see pics.

Huh, well I learned something. Gotta love it when that happens. OK, so no wastegate. One question... Do you feel lucky pu... oops, wrong question. Are you just trying to make boost sitting still and free revving the engine, or are you getting no boost under load as well? (ie: driving)

Expandable foam would work well. Just make sure you get it smooth, and glossy before you lay any glasswork down on it. Oh yeah, make sure its sealed in there with some type of paint, otherwise the resin may attack it.

quote: Originally posted by Joe75z: nah it is hooked up right, and there is no wastegate on this turbo, just uses a blowoff valve. You mean pop-off valve? If you are expecting a blow off valve to control your boost levels, you've got problems. No wastegate? Not internal nor external? I'd be afraid to run without one. Why don't you have a wastegate? If its not a wastegate problem then I would wonder if you were getting oil pressure to the bearings in the turbo or not. Or if it was incorrectly rebuilt.

quote: Originally posted by Z_Ferrari: I have my reference point on my wastegate connected to the little nipple on the turbo inlet. I am thinking this is a vacuum source only, as the turbo is sucking all the air from the point to the airfilter. What I got out of that is that the vacuum reference is hooked up before the turbo inlet, so that it will never see boost, and that the wastegate will never open. Did I misread it?

Done what before? I'm just spilling a little of what I know of fluid dynamics.

It can be done, and it has been done. There are a lot of discussions here on that very topic, so try a search, and then see if you still have questions.

Well 'better' is a relative term. You'll be quieter with 2 pipes as opposed to 1 large one. As long as you plan on the slightly less flow you could run 2 pipes without a problem, just size accordingly. Also, it can be a heck of a lot easier to have good ground clearance when running 2 smaller diameter pipes as opposed to one large one. Lots to think about, but at least you'll be able to make an educated decision yourself.

Dude, absolutely that could be causing your problems! Basically the wastegate opens at a set pressure, in the stock case its 6-7psi. It uses the vacuum line to trigger it. If you have it hooked up right at the turbo outlet, which is how it it stock, the 6-7psi is what is right at the turbo outlet. Once you add an intercooler and have a pressure drop, your wastegate may be seeing 6-7psi, but instead of your engine actually seeing 6-7psi in the manifold, its likely more like 4-5psi. (Assuming a 2psi pressure drop across the IC) So technically with no other mods, you may be losing power by adding an intercooler. (granted the higher air density could offset this somewhat, but thats another point all together) Now, by connecting the vacuum reference line to the turbo inlet, your wastegate will NEVER see the 6-7psi that it is designed to open at. It will only see vacuum. Therefore your wastegate will NEVER open. Which sounds like exactly the symtoms you describe. Do yourself a favor, and if you are running an intercooler, reference the wastegate from between the IC and the throttle body. Then your engine will be seeing the same pressure of air after the IC install than it did before. [ July 08, 2001: Message edited by: Drax240z ]

Crap, I lost it in my last hard drive wipe. No matter how much I prepare, I always lose something when I wipe. I have a feeling I know which bosch pump it is, likely the same one as on my buddies 323i. I'm surprised that is enough pump for your application actually. I hear you on the custom everything route. I feel that way sometimes too. Every time I want to do something, I have to design and make a piece to do it. Too bad there wasn't enough demand for this swap to warrent making a kit with custom brackets, etc.

You don't need to pull the turbo right out to check it. Just remove the piping going from the air filter to the turbo, and reach your hand in while its on the car. Its a realy pain in the ass to get the turbo off the manifold while out of the car, let alone while its in it!

You're probably going to have a lot more luck trying some of the Z31 sites out there for this info... I really don't know much about the engine except its hella light, and produces good power.

Its probably worth your time to give them a call and ask them. I don't think the dual 4F setups would work though.

Right on Ross! Glad to hear you're finally infected. What fuel pump did you end up going with in the end? You need to get that bad boy over here and take me for a spin.

The area of a circle is equal to Pi*radius^2. For this lesson we'll ignore the surface friction on the pipe walls. Basically having 2 2" pipes, are going to yield 2*3.1415*(1)^2 or 6.283in^2 cross sectional area. Having 1 2.5" pipe will yield 1*3.1415*(1.25)^2 or 4.908in^2 cross sectional area. Of course there is flow loss due to surface friction, and you will see more flow loss with 2 pipes than with 1. (it depends on circumference basically)

The extra volume you've added in the intake system (ie the intercooler) is causing a pressure drop. The better the IC you get, the less the pressure drop will be. (normally) Usually you can simply turn up the boost a little to compensate for the drop.

The advantage is a lower center of gravity. I don't think this is a modification worth the time or effort for anything but an all out racecar. New manifolds would most likely need to be constructed, as well as possibly modifying the oil system.