C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

dyno but low numbers

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Old Feb 25, 2008 | 11:54 PM
  #21  
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Originally Posted by BLWN BUX
Your A/F looks OK faily stable for the Power you are producing.
its a bit lean in spots We usialy dont like to see anything leaner (Higher) than 12:0 but that is not why you are not making power.

You need a Boost gage. You will never know if your belt is slipping or not. You say it has a High output impellar? They quite make them years ago and SN owners would love to have one. They are called VR4's. They are very rair and It is likely that you have the stock 850 CFM impellar. It will make 7# on a 350 CFM TPI only if you have the right pully ratio and the belt is not slipping.

has your car ever had a boost gage on it that you have sean go to 7-8# ?

The blower puts a big load on the engine. If there is not enough boost and power added then there is no point in keeping it installed.

BTW: Once your engine starts to make more power, then it will be real lean and need a re-tune.

Good Luck

Chad
i have the sn-93 with the highoutput impeller installed i know the vr-4 they stop making them years ago,i will put a guage on it tomorrow ans see where the boost reads.
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Old Feb 26, 2008 | 12:50 PM
  #22  
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3.5 psi guage
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Old Feb 26, 2008 | 01:09 PM
  #23  
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Originally Posted by antoine
3.5 psi guage
Ouch... you may have found your problem.
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Old Feb 26, 2008 | 02:24 PM
  #24  
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i hope so
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Old Feb 26, 2008 | 09:38 PM
  #25  
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Let us know how it turns out

Chad
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Old Feb 26, 2008 | 09:52 PM
  #26  
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i'm off this week and today i was hearing a air leak at the tpi so tomorrow going to my job so they will do a smoke test to see where the
air leak is.
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Old Feb 27, 2008 | 04:09 PM
  #27  
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hey chad,

i thought your car was red?
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Old Feb 27, 2008 | 05:30 PM
  #28  
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It looks like he may have had a color change, as the seats are still red. It does list red in his profile.
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Old Feb 27, 2008 | 11:23 PM
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It was Red on Red and I change the paint to "Black Christle" I did the interior to all black as well, but I left red stripes in the seats.

I for got to change my profile, thanks for te reminder

Chad
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