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Twilightoptics
Hardcore (12sec Club)
Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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 Posted: Thu Mar 31, 2011 8:08 pm Post subject: |
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Exactly. The TB up front and a square plenum. The front is say 13:1, the middle about 12.5:1 and the rear about 12:1. Your WB reads 12.5:1.
This is from the Holley tuning engineer BTW.
Less problem on TBI of course with the injectors up top the "mixture" occures before the chamber.
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A redline a day keeps the carbon away! |
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chevymad
Master B
Joined: 11 Jan 2004
Posts: 5477
1987 Pontiac Formula
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| Posted: Thu Mar 31, 2011 8:30 pm Post subject: |
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| And I would guess with the tb more central that would help the most. I just wouldnt have thought about a dry manifold having distribution problems. That from DougF? |
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Alphius
Peanut
Joined: 05 Sep 2006
Posts: 2429
Location: Grand Mound
1984 Chevrolet Camaro Z/28
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| Posted: Thu Mar 31, 2011 11:30 pm Post subject: |
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| Twilightoptics wrote: | Exactly. The TB up front and a square plenum. The front is say 13:1, the middle about 12.5:1 and the rear about 12:1. Your WB reads 12.5:1.
This is from the Holley tuning engineer BTW.
Less problem on TBI of course with the injectors up top the "mixture" occures before the chamber. |
Maybe it's not as bad on some engines? I found this quote supposedly from someone at Holley...
| Random dude on internet wrote: | This is a quote from a guy over at holley I had some contact with.
"I do know they have some distribution issues on the N/A applications but not enough to worry about.
I dynoed the Stealthram Vortec the other day with 8 widebands, non-adder, and at WOT the A/F was within .5 on every cylinder. Looked very good." |
I do target WOT 13:1 on my motor and it loves it. I have targeted all the way from 11:1 WOT to 14:1 WOT and it feels better and crisper at around 13:1 than anywhere else. Although I have not made back-to-back pulls at different AFR to see how it really responds. 
On second thought Luke keep it safe, I don't think of blowing something up at 13:1 because I've run at least 10-15k on this setup with no problems, but sometimes I speak (or type) before I think it all the way through. Keep it in the 12's at WOT and you'll be fine.
Thanks for keeping me honest Paul... 
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84 Camaro Z28 - LS1/T56
85 Silverado - Low and Slow |
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91camaro_rs
Member
Joined: 03 Dec 2008
Posts: 1712
Location: Fox Island, Wa
1991 Chevrolet Camaro RS
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| Posted: Sat Apr 02, 2011 9:59 pm Post subject: |
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buying the AEM wideband right now
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'91 Camaro RS 5.7 TPI- 700r4- 3.27 posi- headers- chambered exhaust- |
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