fast347

ok my car is a4 has a built 348 stage 2 heads,cam is 230/227/ .591/.571@112,mac headers,no cats,ls6 intake,pulley,3.73,3600vigilante stall,borla,mti lid,ported throttlebody, i run 26x10.5x15 on 15x10 welds car ran 7.522 1/8@92mph with a 1.66 on 60ft car pulls hard of the line but after the 1/8 it feels like it's runing out of gear also car won't stall any higher than 2,500 rpm at the line it want to go forward would a taller tire help me in top end 1/4 time is 11.806@115 mph

Villain281H

iTrader: (5)

Running the 28 x 10.5 tire will add about 1.5-2" of diameter, which will drop your top end rpm down about 150-300 rpm. It will also give you a slightly longer footprint for help in launching. It will also makes your time between shifts a little longer.

Derek

Matt D

iTrader: (49)

Stick with the 26" tires. Auto with 3.73s and a 28" tire will be too much for your N/A setup.

fast347

what is the best way to launch on my vigilante 3600 stall, I tried 2000rpm and 2500 and i still manage 1.6 on 60ft any higher car will start to roll forward.

Matt D

iTrader: (49)

Don't foot brake the converter, flash it. Stab the gas off of idle on the second yellow light

Bryan @ Speed Inc.

iTrader: (19)

i'm with kinky ^^^ flash the 'verter.

fast347

Thank's for the help is just that, I use to have a m6 z28 with similar mods and I am new to a4 getting use to the converter and what improvement would i get if a flash the converter off the line i was getting 1.6 60'ft

Matt D

iTrader: (49)

I could see mid to low 1.5s.

fast347

thank's again for the help. I just waiting for the track to be open in a couple of weeks.