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New owner. boost problem question

Found this site through a google search, excited to learn everything I can!



I can hear the turbo spool up but no boost is shown on my AEM gauge.
I can hear turbo flutter when I press the clutch in after trying to boost.

I have replaced the turbo with a rebuilt K26-6 from Lindsey Racing.
Replaced the TPS
Replaced the Cycling Valve. When I block off the wastegate line, I have no boost enhancement.
All vacuum lines are brand new.
I tested the BOV by trying to suck air through it. I cant blow air into it either. I removed it today and everything looks good.

Hopefully theres a few 944 wrenchers that could help me out.

Last edited by Champagne; 12-10-2008 at 05:45 PM..
Old 12-10-2008, 05:26 PM
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is your gauge broken or not hooked up right? is there no actual boost? without it, these cars are dogs. i mean absolutely without acceleration.

blocking the wastegate line and nothing is affected? bad wastegate, it sounds like to me.
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Old 12-10-2008, 06:20 PM
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Gauge is hooked up good and works perfect.


Question - If the wastegate was bad woulden't the exhaust just get bypassed and cause the turbo not to spool?

I can hear the turbo spooling, no boost. I must be losing all that PSI from somewhere between the Turbo to the intake. Right?

I figured it was the BOV, but I can't suck any air or blow any air into it. I am assuming this means the BOV is in good shape.

Also: Intercooler couplers look good.

Last edited by Champagne; 12-10-2008 at 06:35 PM..
Old 12-10-2008, 06:30 PM
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i think the turbo would still spool, a bit, it just wouldn't create much boost. plus, if you had a leak big enough to lose all the boost from the turbo, you'd also have a huge vacuum leak and your car would run like crap.

however, if you feel that may be the problem, just trace all the plumbing from the turbo to the intake and check the gaskets on the intake/head and all the rubber connections at the hard pipes.
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Old 12-10-2008, 06:36 PM
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I think you're right! Wastegate.

I just took the car for a spin around the block... wastgate exhaust pipe is lighty warm. I read on another thread that some people have some for sale.
Is this the best option, or should I upgrade into a dual port from Lindsey? I realize I would need a MBC and everything.-- Is it worth the extra $500 and time under the hood??


I only want to boost 10 psi.


I called Dave Lindsey, I asked "Why does it flutter when my gauge isnt reading any boost?"

He said " The reason it flutters even when you can't see boost on the guage is that you're looking at the pressure in the plenum (after the throttle), but the turbo can actually be producing a bit of boost in the intercooler and intake pipes"

He said its 99.9% a wastegate issue.

Last edited by Champagne; 12-10-2008 at 07:45 PM..
Old 12-10-2008, 06:50 PM
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will an '89 Turbo S wastegate fit an 86 ? I realize the bolts will be diffrent size.
Old 12-10-2008, 08:03 PM
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From what I recall, waste gate should be the same between all 944 turbos. The piping is modified between 86 and 87+ cars.
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Old 12-11-2008, 02:29 AM
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I am ordering a single port wastegate today as I have no intention of boosting more than 10psi or hooking up a MBC.
Lindsey Racing is too expensive right now, and the ones on ebay arent made for an 86..

Before I order the '89 wastegate from ebay ---

I found an '88 wastegate from a lister on Rennlist with 120k miles for 55 bucks + shipping. good deal ? I just need a stock application and would paypal $60ish for a proper 86.

Last edited by Champagne; 12-14-2008 at 09:43 AM..
Old 12-14-2008, 09:39 AM
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Quote:
Originally Posted by Champagne View Post
I am ordering a single port wastegate today as I have no intention of boosting more than 10psi or hooking up a MBC.
Lindsey Racing is too expensive right now, and the ones on ebay arent made for an 86..

Before I order the '89 wastegate from ebay ---

I found an '88 wastegate from a lister on Rennlist with 120k miles for 55 bucks + shipping. good deal ? I just need a stock application and would paypal $60ish for a proper 86.
I don't have experience with this yet, but it looks like later years are interchangeable. From Paragon Products:

There is a slight difference between the early (86/87) wastegate and the 88 and later models. It is limited to the shape of the cooling fins and diaphragm bolt flange area. All other dimensions and components are the same. Both styles are interchangeable. We prefer you order for the year of your car.

So it appears that ordering an 88 or 89 wastegate is okay, even though they do have different part numbers for an 86/87 wastegate and an 88+ wastegate. I would be hesitant to order a used wastegate that is old and has many miles. They don't just fail due to use, they have a diaphragm that gets old and brittle and fails. You're not likely to have much luck (at least for very long) with another used wastegate, and you'll have invested a lot of effort to replace it. I know a new one is pretty expensive, that's the only reason I haven't gone that route yet, just waiting for mine to fail first.
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Last edited by jmj996; 12-14-2008 at 09:52 PM..
Old 12-14-2008, 09:33 PM
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I read on Lindsey Racing that the bolts are the reason. To install an '88+ wastegate on a 87 or 86, you need different bolts.

I ordered a dual port with a MBC. lol, for the same price I should do a little upgrading. I guess I will delay my catch can install untill everything is here at once.

Where does everyone go to get oil rated hose?
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Old 12-15-2008, 12:18 PM
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Quote:
Originally Posted by Champagne View Post
I read on Lindsey Racing that the bolts are the reason. To install an '88+ wastegate on a 87 or 86, you need different bolts.

I ordered a dual port with a MBC. lol, for the same price I should do a little upgrading. I guess I will delay my catch can install untill everything is here at once.

Where does everyone go to get oil rated hose?
Have you been down in there before? Seems like a LOT has to come out to get access. I had the intake off for a head gasket job and almost pulled the OAS to install new o-rings. Didn't get to it, I could easily see how to remove the top two bolts but the bottom one looked like a bear to get out with a few other things in the way, and I didn't want to risk screwing anything up (and I had already had enough, I wanted to get the engine back together).

Is a catch can really worth the trouble? If it's all the trouble for a catch can versus just cleaning out the intake once in a while, seems I'd rather clean out the intake.
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99 996 cab: 2004 - present,GT3 & Strosek mixed body
86 951: 2008 - present,951MaxChips,LSD,LBE,924t hood & rear spoiler, Koni/Eibach/Ground Control, 3Bar FPR, lowered,brake cooling, Lindsey spherical bushings
99 986: 2002-2006, PSE (my favorite of the three, but with kids, it had to go)
1986 951 pic
Old 12-15-2008, 09:29 PM
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you do not need to pull the AOS to install a catch can. You just install it where ever you want between the top of the AOS and J boot connection.


I do not want to pull the Turbo/down pipe to acess the AOS bottom screw.. I unbolted the AOS heatshield but have had NO luck getting it out. Is it possible to get the AOS heat shield out without removing the downpipe?
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Old 12-16-2008, 03:37 PM
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hello MrPorsche951 i mean Champagne !
Anyone have a Stock working wastegate for an 86?
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Old 12-24-2008, 04:35 PM
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