IAC Adjustments After Tuning... rich now?
09-05-2005, 10:10 PM
#1
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IAC Adjustments After Tuning... rich now? I had my car tuned after I installed the cam, and Sean, who tuned the car, agreed with me that the car was running alittle bit rich at idle. So he adjusted everything, did the full tune, and then I went to a second speedshop to get a dyno done for before/after #'s w/ my cam. Well my buddy workin there hooked up the tech 2 and noticed that my IAC was pretty high, so he had one of the mechanics at the shop make the adjustment on the TB and he checked on the tech 2 and comfirmed that it was back down to a more reasonable range.
I really hadn't sat in traffic in between shops, so I can't give a definite comfirmation on this. But my car smells like its running pretty rich at idle. I'm comparing the smell to a friends car who is tuned and runnin the same exhaust setup and my car smells alot more like straight gasoline than his does.
My question is, by having it tuned, and THEN adjusting the IAC screw on my S2 TB, could that have messed up my a/f ratio at idle?
I really hadn't sat in traffic in between shops, so I can't give a definite comfirmation on this. But my car smells like its running pretty rich at idle. I'm comparing the smell to a friends car who is tuned and runnin the same exhaust setup and my car smells alot more like straight gasoline than his does.
My question is, by having it tuned, and THEN adjusting the IAC screw on my S2 TB, could that have messed up my a/f ratio at idle?
09-05-2005, 10:17 PM
#2
The gas smell is most likely because your A/F ratio at low speeds and idle is not as good as it can be. You'd probably benefit from a good speed density tune. Your VE tables are probably not in the ballpark for good A/F ratios when in open loop. Adjusting the TB to drop IAC counts shouldn't jack with your A/F ratio though. Your original tune may not be as good as your friend's tune.
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2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.