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3" Catback Turbo Spools Slower

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Old 04-06-2011, 09:36 AM
  #31  
Tedro951
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Nevermind, I should have known to stay out of this one....
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Old 04-06-2011, 09:50 AM
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Originally Posted by Fastrax203
Not true on my '97 Miata Turbo.
Isnt that a girly car?
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Old 04-06-2011, 09:51 AM
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Originally Posted by Tedro951
Nevermind, I should have known to stay out of this one....
can't blame ya for trying...

Well I took the car for a drive this morning and got into Wot in first gear which to my shock actually got 10psi, which it usually is. I think getting that huge leak fixed at the muffler helped a lot. I checked for vac leaks and I'm good. I check the front of the exhaust and everything appears to be fine. So once the other minor leaks are fixed I should be good.
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Old 04-06-2011, 09:52 AM
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Originally Posted by carlege
Isnt that a girly car?
He did say "Turbo" that makes it a mans car :P
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Old 04-06-2011, 09:54 AM
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Originally Posted by CyCloNe!
can't blame ya for trying...

Well I took the car for a drive this morning and got into Wot in first gear which to my shock actually got 10psi, which it usually is. I think getting that huge leak fixed at the muffler helped a lot. I checked for vac leaks and I'm good. I check the front of the exhaust and everything appears to be fine. So once the other minor leaks are fixed I should be good.
I dont know i doubt the leak at the muffler had anything to do with it. Did he reinstall the old muffler bearings?
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Old 04-06-2011, 09:57 AM
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Originally Posted by carlege
I dont know i doubt the leak at the muffler had anything to do with it. Did he reinstall the old muffler bearings?
Muffler Bearings? Lost me with your hip young lingo there
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Old 04-06-2011, 10:03 AM
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Originally Posted by carlege
Isnt that a girly car?
Girly car with the girly hair drier accessory.
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Old 04-06-2011, 10:07 AM
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Originally Posted by CyCloNe!
here's what it looks like, crappy pic and angle:

I think the problem is that your car is upside down. Put it back right side up and it will run better.

Seriously folks – back pressure on the exhaust side of the turbo will not make it spool faster – and leaks on the exhaust side will not make it boost less or slower.

However – welding on the car exhaust while connect to the engine without discontenting the battery may annoy the hell out of your electronics!
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Old 04-06-2011, 10:15 AM
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Originally Posted by Chris White
I think the problem is that your car is upside down. Put it back right side up and it will run better.

Seriously folks – back pressure on the exhaust side of the turbo will not make it spool faster – and leaks on the exhaust side will not make it boost less or slower.

However – welding on the car exhaust while connect to the engine without discontenting the battery may annoy the hell out of your electronics!
Thanks for your wisdom Chris, might just all be in my head then
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Old 04-06-2011, 10:51 AM
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I recall hearing that 935s were notoriously under-performing cars due to excessively low back pressure from oversized open exhaust....
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Old 04-06-2011, 11:08 AM
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LOL! Love the use of the dixie cups on that one...
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Old 04-06-2011, 11:11 AM
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Originally Posted by CyCloNe!
I'm going to check for exhaust and boost leaks to make sure, if not then it's just simply like what Fastrax said... I already found one decent exhaust leak right at the weld for the muffler inlet, I got that fixed but it's still a little slow on spool. I think I got a few RPM's back lol.


Nope it's an NA with a leafblower taped to the intake
The leak at the muffler has no effect on boost. Look for a vac leak and check for leaks between the exhaust manifold and the turbo. AFTER the turbo, leaks make no difference in spool.
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Old 04-06-2011, 11:16 AM
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Originally Posted by Oddjob
I recall hearing that 935s were notoriously under-performing cars due to excessively low back pressure from oversized open exhaust....
I'm surprised that thing even runs, what with those to huge exhaust leaks at the end of the exhaust pipes.

Just joking of course. For a more helpful response, re-read Chris W's post. He is right.

(And, just in case it comes up again, the earth is not a disk sitting on the backs of huge elephants).
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Old 04-06-2011, 11:25 AM
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Cyclone: the only way i know how to check for exhaust leaks is to run some sea foam through a vacuum line. This produces alot of smoke and may make your engine run rough through the process but it is good at making leaks obvious.

Any one have any better solutions?
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Old 04-06-2011, 11:28 AM
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Originally Posted by Oddjob
I recall hearing that 935s were notoriously under-performing cars due to excessively low back pressure from oversized open exhaust....
lol. I just saw a 917 at Brumos that had the same problem. Terrible performer!
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