I installed 3.73's in my car from 2.73's, ran ET Streets on the car instead of the stock GSC's, and was expecting to hitt 12's. My old best before gears/tires was a 13.28@105.9 on a 2.1 60'. With gears/tires i made 3 passes.
13.8@105.6
13.39@105.7
13.29@105.8

Needless to say im a little unhappy with the results

 

What were your reaction times before and after? My best guess w/o seeing a timeslip would be that your takeoffs were worse after the mods.

 

converter + tune = 12.5's probly better

 

stock converter + ET streets = poor results.

 

one problem is i couldnt stall the car past 1500, the brakes wouldnt hold. The car is tuned, but it was short shifting first a little bit. Maybe need to adjust the shift points a bit. A converter seems to be a must now.. the car has it up high but needs more help getting there. Get its big butt movin

 

what is with people not posting any damned needed info around here lately when asking a question


hard to comment on the before/after comparison without knowing the sixty foot on those et street passes...

 

this is the second thread i've looked at in 2 seconds where you've said this and it is not correct. are you confusing r/t with sixty foot?

 

I was wondering that same thing.

 

sixtys on street tires ranged from 2.11-2.18
sixtys on et streets ranged from 2.03-2.12

 

i pulled 1.8 60ft's on sumos street tires

 

What size were the ET streets? You are giving back gear if they are taller than your stockers.

How wide are they? I think they are costing you more up top than they are helping you down low. A nitto or comparible DR is all that you need at your power level. Anything more is overkill and will slow you down.

Just my 2cents

 

what psi are you running the et streets at???

 

the weather was about 80* with very high humidity! The car short shifted with the et streets for some reason, and the car just wouldnt stall. we get the brake thing fixed and a stall the thing will fly.
id say converter and a nice set of drag radials and 12.5's for sure!!!

 

Sounds like your shift points need to be redone. Find someshop with LS1 edit or Hp tuning and this should make a big difference.