st pete chad

ok so i finally got the car to the track.still need to get it tuned but i think it did good for the way it is right now.was only running 8.7 psi so i think 16psi should put the car into the 6.5 range if i can get it to hook.im curious what this would have been in the 1/4.i looked it up online but i was told not to go by those times because a turbo car will pick it up on the top end.im guessing low10s maybe high 9s ?


i turned the boost up a little but the track would not hold it i was just blowing the tires off it

Razor

No.. A high 6 second pass is a high 10 second pass. At best your car will pickup 25 on the backend so 101+25=126. Thats MPH for like a 10.80 at 126. You need 135 for a 9 second run with a good 60 foot. Like a 1.40. A 9 second pass is more like a 6.50.

You need to get the car tuned and sorted out before turning the boost up. If not... you'll hurt it. Very easy to grenade a motor with a turbocharger.. very very easy. Typically from leaning it out when the boost comes up.. then detonating it from not running proper octane/air fuel.

st pete chad

it will be quicker then 126 i have already hit 130 in the 1/4 but i had to keep letting off the gas because i was running out of gear with my 3.73 and this is only at 8.7 psi

so you went 6.1 in the 1/8 and 9.3 in the 1/4 so thats 7tenths better in the 1/8 then me and you think thats high 10s i was thinking low 10s

i had another pass 1.7 60ft went 6.8 at 107 so it picked up 6MPH but i lost 2tenths in the 60 because it lifted the tires and then started spinning.

Razor

When I ran a 6.19 it went 9.68. I also ran 140 which was 113. Cars typically pickup 20-25 when their in the 11's. 23-27 when in the 10's.. 25-30 when in the 9's. 27-32 in the 8's. It ran 6.20-6.30 and 9.8-9.9.

Rule of thumb it has to break into the 6's to be in the 10's. Its like a 1.56. So you take the 1/8 multiply by 1.56'ish and you get your round about number so 6.859 x 1.56 =10.70 at 127 if I was a guessing man The MPH has to go to up.. thats the battle. The 60 will be your ET. But on a street car.. 1.40-1.50 should be the norm with good tires and some boost of the line.

Razor

Unless you have a 6 speed Supra then its 50 MPH from 1/8 to 1/4

Iraq&Roll

A good working torque converter will play a big part in the 1/4.

st pete chad

i was kinda going off your time slip you posted where you reached 1 goal of yours.it shows you went 6.1 1/8 and 9.3 in the 1/4...either way im kinda happy i dont think 6.8 is bad for a car that needs tuned only running 8.7 psi and car only has 11 degree of total timing.

Razor

Yes but an automatic car can only pull so much HP. You can measure HP and interpolate how much it will run in the 1/8 and 1/4. This assummes a properly functioning setup.. meaning TQ converter is setup properly. If its too loose it wont pull past the 1/8 mile as efficiently and wont make the target MPH increase. In his case bad tq converter is 20 pickup. Good is 27-29. Assumming AFR, boost, and timing are under control.. then coupling from the tq converter

Razor

Its running great for the little exposure you've had messing with it. How many would love to drive a car to the track and crank out a 6 second 1/8 mile run. Thats nothing to sneeze at..

Just take small steps on boost increase and watch what the motor tells you.

st pete chad

yea i wont mess with the boost anymore till its tuned.the timing is crap on it only 11.as for the convertor its a PTC convertor and it seems to be real tight.its a 4000 stall when driving on the street i dont feel much slip at all.

it made 550& 600@ the wheels but the dizzy was bad and would not pull past 4800rpm and clutch was slipping.so i hope with the c4 it should make 600+ with 16psi

if i knew then what i know now i would not have went with a c4 i would have went with a glide or turbo400