I am picking my truck up today with the ls1 e-fans installed.
How much of an improvement do you guys think I will get in the 1/4 mile?
My ud pulley was worth .13 reduction in the 1/4.

 

i didn't notice much gain in my efans until the stock clutch fan would normally come on. then that is when you can tell the diff. my truck felt sluggish with the stock clutch fan engaged. but with efans you don't feel that.

 

Doing the E-fans and the Crank Pulley I gained 16rwhp on the dyno and it cut my track time from a 15.011 to a 14.89 (spun more afterwards as well).

 

I felt a nice differecne with mine. I don't have before and after track times but from what I hvae heard, e-fans are worth about .15 off your et on the .25

 

I went from 15.3 to 15.1 w/ the e-fans and 160 thermo and TB by-pass mod. and then to 14.7 w/ removing the gibson and putting on the Dynomax and cooler weather...Zed

Also truck would spin from stop after putting on the DynoMax and w/ the Gibson it wouldn't.

 

City MPG should go up 2 mpg in the summer. The AC will be much cooler when sitting in stopped traffic in the summer. Highway MPG should go up at least 1.