I am installing my 3.9 tommarow morning and my suspension tommarow night...

so what are the impressions now of the 3.9 with FI now that its been a few weeks...

hope to hear good feedback...

 

Most FI people want TALLER gears, not shorter! Traction with turbos is bad enough as is. I'm considering a 3.3

 

so buy some tires and an LSD

I have 2 cars with boost and 4.285 final drive.

I believe it's more of a personal preference. Along with matching gears for tracks. (if you do that)

taller gears help with loading the turbo. But shorter gears aren't going to "ruin" things.

 

there are i believe two people on this site with the 3.9 and single turbo...

 

i am hoping to hear from those people that have installed both turbo and 3.9 i am under the impression that the 3.9 will help the get through the lower end lacking of tq of the single and help the car shine where it happy in the top end of the system...

 

I have it all.....

ST.....8-9 PSI
3.917 gears...
Tilton Flywheel...

I havent track'd yet but seeing as I dont really the gear really affected is 1st....Its a fun car to drive.....as far as effective gains for $ on the 1/4 probably to minimal to notice.....maybe only .01 or .02 off ur times.....

I think the 850 + labor could have been better spend on Cams....IMO

Dont get me wrong on the Highway I eat cars that dont expect it..and my wife thinks the front of my car gets off the ground...LOL yea right on 8PSI....

So acceleration is increased....Slicks or Radials will help a lot but maybe only a Great shifter will get the most out of it.... 4 shifts to get to 5th gear could run you up to 2 seconds....

 

man you car must have insane accel^