Cool to see some info on pump gas tunes. I've been playing around lately on pump gas (no alky) and reading up on what tunes people have used. Seems to be most are runing from 17 to 20 degrees of timing with those running less timing being able to make more boost. Some people have said that even though you can run more boost with the timing pulled down to 17 degrees, that it isn't necessarily making more power.
Last week in some hot weather on pump gas, I was able to run 19lbs of boost with 19/18 timing running almost 111mph in the 1/4 on street tires with major peddling in the beginning of the run. I upped the boost to 20lbs and pulled out only half a degree timing but let out because I started to get a little knock up top. My ET was quicker though and I upped my 1/8 mph from 87mph to 90mph and knocked almost two tenths off the 1/8 ET. If I lower the timing down to 18/17 I don't think I'll get any knock at 20lbs boost and will run faster than 19lbs boost at 19/18 timing. I think I can get 112-113mph out of it. On sticky tires not peddling it, maybe 115mph.
I think the heat was hurting power too, as it was almost 90 degrees out and muggy. Curious if I will got knock in say 70-80 degree weather at the same boost. The inlets temps going into the MAF were also very high as I just had a cone filter under the hood. I think the IAT temps were at 150 degrees or so. I put my big mouth cold air kit on and the inlet temps are now close to ambient air temp. On alky I didn't notice any difference in power as it seemed to neutralize any advantage the lower inlet temps could make. I'm curious if there will be advantage with the lower inlet temps when I'm not running alky. I know a lot of people say the airflow restriction form a cold air kit hurts the potential, but I also switched from a 3" MAF pipe to a 3.5" MAF pipe with the 4" cold air kit so I doubt I'm hurting any airflow.
Anyway, I'd also like to hear more input from others running pump gas only for ideas. Any experience from running in hot weather to cooler weather and the effects would be appreciated too. I saw a lot of info on pump gas tunes, but not many where people were racing though. I'm shooting for high 11s on pump gas and street tires. I've already run 11.8@118 on street tires and 11s on pump gas and sticky tires would be no problem. Doing it on both is a challenge though.
