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#1 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,365
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Hit the dyno again today. After installing the new to me, ported plenum and IH, done by Locobob, I'm up 44 hp.
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#2 |
![]() Join Date: Apr 2004
Location: ATL. GA.
Posts: 2,169
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Congrats....Nice gain. What were the numbers?
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Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold |
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#3 |
![]() Join Date: Feb 2014
Location: AZ
Posts: 860
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Are you serious? Porting the plenum and IH gave you a NET 44 hp? You gained over 10% of the overall HP of the LT5? At the wheels? You ran it on the dyno immediately before and after this mod?
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#4 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,365
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I was 353 at the wheels before, actually 2 years ago. Early this winter, bought a ported plenum and injector housing form Locobob, also did injectors and coils. Today, dyno'd at 397 rwhp.
Did a couple of other runs. When I bought the car with a K&N, dyno'd at 311. Did headers and exhaust, 353. Ported P & IH, 397. Key off today, 247, exactly 150 hp loss. Accordion pulled, get this, 386, lost power. Next is a visit to Pete. Steve PS, next on the dyno was a 1,000 hp Mustang. |
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#5 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,365
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Couple of years in between, but that was the major mod, other than injectors that were not giving me trouble. It all started with doing injectors, next thing you know i'm investing in a powder coated plenum and IH.
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#6 |
Join Date: Feb 2004
Location: Ma
Posts: 404
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Nice numbers. Whole new world isn't it? Did you go with OBX all the way back? Also, just curious if the numbers were SAE or STD?
Congrats on the new power.
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1990 ZR1 #2574 Medium Quasar Blue Metallic 1 of 19 |
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#7 |
![]() Join Date: Feb 2014
Location: AZ
Posts: 860
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That's an impressive gain. Would you say the SOTP gain was greater when you added headers/exhaust or when you added the ported plenum/IH?
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#8 | |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,365
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SAE adjusted, but it was a perfect day and there was no correction. -Steve |
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#9 |
![]() Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,365
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Hard to say on SOTP, it was almost 6 months in between drives with the new top end parts. Also should add, Marc chip done with exhaust, and redone for the porting. Marc may have gotten a little aggresive, we think we saw some detonation at between 6k and 6500. -Steve
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#10 |
![]() Join Date: Jan 2010
Location: Mystic CT
Posts: 2,620
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Steve
You're up early? Doug |
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