I am building a L98 for my GTA 5-spd. I'm using a ZZ4 cam, headers, exhaust, K&N,!TB, Coil, Chip, ported plenum, and a few others. I thought I heard that with a bigger cam you had to adjust the IAC, TPS and something else. I have the Speed Density TPI also, is it more "finicky"? Well, I appreciate all the help! Thanks

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'91 GTA:5.0-5-spd, chip, K&N,Flows,Coil,Air Foil, 350 soon to come!
'39 Chevy coupe
'52 Chevy p/u

 

If you had a maf, you might need to lower the tps voltage until you get a custom chip so it will idle below 1500rpm. However, since you have a map then you will NEED to get a custom chip asap.

I've got my tps voltage at .35 until I get a chip...I guess it couldn't hurt to try but I don't think it will make much difference on your car.

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87 IROC-Z, 5.7, auto, 3.27, leather, !cat, Holley fpr, K&N'S, SLP 1-3/4" Jet-Hot coated headers, SLP .218/.224 .495/.502 cam, Comp 1.5 roller tip rockers, $uperPITAram, Edelbrock lower intake, Holley 52mm tb, Dynomax\Flowmaster catback. Coming Soon(?)- Fasttrack/Accell DFI

1989 Pontiac 20th Anniversary Turbo Trans Am - 161,000 miles, !cat, 9" K&N

 

You will not need a custom chip for a ZZ3/4 camshaft with speed density. The engine vacuum is the same as the stock cam.

 

Thanks guys! Anyone else? Later

 

Read my post about IAC min idle min opening at the prom section.

 

OK... thanks!

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'91 GTA:5.0TPI-5-spd, Hypertech Stage 2 chip, 160stat,!TB,!Cat, K&N, Flowmaster muffler, Accel Coil,TPI Air Foil, 1LE Alum DS, poly-tranny mount, KYB's all around, & a Hotchkis Strut tower brace.
Mods in progress:
-L98 w/ZZ4 cam/springs
-Edelbrock headers
-3" flow setup
Future:
-T56/heavier clutch
-Hurst or Ripper
-4.10's
-Ram Air II Hood
-1.5" Springs
-Rebuild suspension!
Others:
-39 Chevy coupe
350/350/3.55posi
-52 Chevy p/u
-77 Bonneville 400PONTIAC/400turbo/posi
Original 50k mile 2 door... Gramp's old car!
*** Gotta love those Poncho's***

 

And while your at it, consider burning your own PROM.