09-20-2008
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#1
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Join Date: Mar 2005
Location: Blaine, MN
Drives: '91 Automagic
Posts: 13,908
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Can't hold boost, did a boost leak test, check inside.
SO yeah, put on the new TB (thanks kevbo, works awesome), fixed my j-pipe bolt (turbo was stripped out).
DId a boost leak test about to 35psi. Small leak out of AFPR on the vacuum line fitting, i guess i need to use some teflon tape on the fitting maybe?
Only other place is the nipple on the top of the TB, i should probably have those welded up too. But these are really small leaks.
Anywho driving the car last night, car would spike to 33psi but settle to 22psi, i just want to hold boost steady and i can't.
Please help with any suggestions or ideas.
Thanks
Aaron
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09-20-2008
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#2
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Can't hold boost, did a boost leak test, check inside.
You want to hold 33psi to redline on a 16g?
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09-20-2008
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#3
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Join Date: Jul 2006
Location: North Branch
Drives: 2004 Corvette M6 F45
Posts: 972
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Re: Can't hold boost, did a boost leak test, check inside.
Try using some colder gas.
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09-20-2008
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#4
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Join Date: Jul 2004
Location: MN
Drives: four tires
Posts: 1,608
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Re: Can't hold boost, did a boost leak test, check inside.
Quote:
Originally Posted by Halon
You want to hold 33psi to redline on a 16g?
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Exactly(agreed). Over upper 20's isn't happening.
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09-21-2008
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#5
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is Nashty
Join Date: Oct 2007
Location: Stillwater
Drives: Cyborg from Japan
Posts: 2,080
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Re: Can't hold boost, did a boost leak test, check inside.
Yeah our turbo's will always drop at the higher rpm. They aren't efficient enough and just run out of steam. Although if you went with an external wastegate you could hold the boost ALOT better to redline.
__________________
-1990 Mitsubishi Cyborg 4WD-
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09-21-2008
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#6
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Join Date: Mar 2005
Location: Blaine, MN
Drives: '91 Automagic
Posts: 13,908
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Re: Can't hold boost, did a boost leak test, check inside.
well 2gtsi on here was holding 29psi steady to redline. CB holds 30psi to redline.
Others spike mid to high 30s but still settle in the high 20s.
Anyone heard of the AFPR leaking how i described?
Know where i can get the TB welded?
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09-21-2008
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#7
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Banned
Join Date: Sep 2008
Location: @ The Track
Drives: ... More than you can afford, pal
Posts: 100
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Re: Can't hold boost, did a boost leak test, check inside.
Quote:
Originally Posted by turbotalon1g
well 2gtsi on here was holding 29psi steady to redline. CB holds 30psi to redline.
Others spike mid to high 30s but still settle in the high 20s.
Anyone heard of the AFPR leaking how i described?
Know where i can get the TB welded?
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You have a tig welder in your garage and your want to know where to get your TB welded?
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09-21-2008
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#8
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Join Date: Mar 2005
Location: Blaine, MN
Drives: '91 Automagic
Posts: 13,908
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Re: Can't hold boost, did a boost leak test, check inside.
^funny guy you are.
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09-21-2008
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#9
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It was a auto get over it
Join Date: Apr 2006
Location: rochester mn
Drives: something better then you
Posts: 1,987
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Re: Can't hold boost, did a boost leak test, check inside.
I have a tiny leak from my AFPR as well but its so minimul that I dont bother with it
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09-21-2008
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#10
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Join Date: Jan 2008
Location: osceola wisconsin
Drives: gutlass
Posts: 787
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Re: Can't hold boost, did a boost leak test, check inside.
Quote:
Originally Posted by turbotalon1g
^funny guy you are.
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if you have a tig welder i can come do it for you for free
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09-21-2008
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#11
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Banned
Join Date: Sep 2008
Location: @ The Track
Drives: ... More than you can afford, pal
Posts: 100
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Re: Can't hold boost, did a boost leak test, check inside.
Quote:
Originally Posted by brando
if you have a tig welder i can come do it for you for free
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He knows how to weld he's just being a lazy ass.
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09-21-2008
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#12
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aka Goodbye
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Re: Can't hold boost, did a boost leak test, check inside.
Do you still run a 2.4?
__________________
2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
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09-21-2008
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#13
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flips McGee
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Re: Can't hold boost, did a boost leak test, check inside.
Quote:
Originally Posted by turbotalon1g
well 2gtsi on here was holding 29psi steady to redline. CB holds 30psi to redline.
Others spike mid to high 30s but still settle in the high 20s.
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Let's see logs or video, otherwise I call BS. Evo guys claim the same shit, and it just isn't realistic on a 16g, even on a 2.0. Besides, boost does not always equal more power, as seen on both Jim and Hughes learned on friday.
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09-21-2008
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#14
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Join Date: Jul 2006
Location: North Branch
Drives: 2004 Corvette M6 F45
Posts: 972
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Re: Can't hold boost, did a boost leak test, check inside.
2.0 stock internals. Time to sell me the Evo 3 and upgrade to a Holset.
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09-21-2008
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#15
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Join Date: Mar 2005
Location: Blaine, MN
Drives: '91 Automagic
Posts: 13,908
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Re: Can't hold boost, did a boost leak test, check inside.
I have seen dyno graphs, the one for CB are all over tooners and link forums.
I talked to Jim and he said his boost is falling off, the only other thing i can think of is the intake pipe being stock could be a restriction.
Steve i am on a 2.0L.
This turbo is going no where but to hell when i done with it, whats a holset?
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09-21-2008
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#16
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Can't hold boost, did a boost leak test, check inside.
I've heard of AFPR's leaking at the top by the adjustment nut. I personally put teflon on mine so I don't have to worry about it.
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09-21-2008
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#17
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is Nashty
Join Date: Oct 2007
Location: Stillwater
Drives: Cyborg from Japan
Posts: 2,080
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Re: Can't hold boost, did a boost leak test, check inside.
Holset is a brand of turbo's.
__________________
-1990 Mitsubishi Cyborg 4WD-
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09-21-2008
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#18
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Kevin
Join Date: Jan 2004
Location: Shoreview
Posts: 3,356
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Re: Can't hold boost, did a boost leak test, check inside.
I used solder to fill my TB nipples, works great.
__________________
Misses the Mitsu Community
Currently on Corvette #4
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09-21-2008
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#19
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91 TSi AWD
Join Date: Oct 2003
Location: St. Paul, MN
Drives: red 91 TSi AWD auto
Posts: 348
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Re: Can't hold boost, did a boost leak test, check inside.
I couldn't hold more than 26psi on my previous 16g.
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09-21-2008
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#20
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is Nashty
Join Date: Oct 2007
Location: Stillwater
Drives: Cyborg from Japan
Posts: 2,080
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Re: Can't hold boost, did a boost leak test, check inside.
My tb is JB welded The only way to hold that kind of boost on these turbo's is to go external pretty much..
__________________
-1990 Mitsubishi Cyborg 4WD-
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