I tuned and race my 383 car in KY at 495 ft. elevation last fall. I come to live in Tucson (~2,800 ft) with the SAME carb setup and it is running lean!! What's up with that?

Only change are the headers. I went from a 1-5/8" TES set of headers to Hooker SC 1-3/4" long tube headers. Is this why? Do they scavenge the cylinders that much better?

BTW, I have an Autometer Air/Fuel gauge and a Bosch O2 sensor on the driver's side header that is giving me the A/F readings. The gauge appears to be running properly.

What do you guys think? Thanks.

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Phil87IROC
Blue '87 IROC, 383 Crate Motor, KB pistons, AFR 190 heads, TPIS ZZ-9 cam, Edelbrock RPM intake, 1" TD spacer, Hooker SC/LT headers w/ Mufflex Y-pipe, Edelbrock 750 cfm Carb (#1411), Stock T-5, GM 3.42 gears w/Auburn posi.
Ohio Valley Dragstrip (KY) Trophy Bracket WINNER - 8.39 ET on a 1.82 sec. - 60'. Best MPH = 84.44. Still Tuning Carb!
Red '89 IROC L98, TES w/Flowmaster, 1LE DS, 700R4, T-Tops, K&Ns w/open air boxes, 160 T-stat, Hypertech Chip, gutted MAF & CAT, Jacobs Ign., 53kv coil, MSD wires.

[This message has been edited by Phil87IROC (edited June 17, 2001).]

 

I wouldn't be surprised if the headers had something to do with it. TES are a lousy set of headers...especially on an engine like that 383 (I'm assuming you're talking about that car). Steping up to a good set of LT's would likely require some retuning.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

After some thought I agree......

Tuning is half the fun!! That's why there's T&T at the tracks!!

Thanks Jester!

Phil