nv4gt ws

i ran all 3 tunes today, to me the 87 tune is the best. the 87 tune pulls hard out of the hole and has great street manners. the 91 tune is a strange tune, it almost drives like you have a 4 bbl carb and a sound of its own. pops and crackles bet shifts, but at idle souds like it has a mild cam. the 91 tune is a slug out of the hole. sound wise i like the 91 tune. now the 93 tune to me is close to the 87 tune, but if you dont have top shelf gas it will ping easy. so i am sticking with the 87 tune, i will load the 91 tune only for the sound. i done with the 93 tune.

vasman

I have all 3 tunes.

I have run 87 with 87+ gas and I felt some loss of power vs 93 with 93+ gas. You are not supposed to run 93 tune with less than 93 octane gas.

I have not loaded my 91 yet as this octane gas is not available in my area.

nv4gt ws

been running 93 octane gas with all the tunes.

1morepart

never tried anything but a 93 tune

sonicmetalicS197

Same I've been on the 93 Race ever since stock

doode

im runnin Bama so i don't know how different they are from Brenspeed

87 = throttle response is night and day over stock, but thats about it

89 = torque tune = best one for a DD

93 = race tune = not a huge difference over the 89 tune IMO.

sycd

What are the driving characteristics of a 4 bbl carb?

sycd

Exactly!!! Brenspeed: please fix this!

StickShifty

i only like my 91 tune. pulls hard up high.

my 87 is very flat past 4000, and my 93 doesn't seem to pull as hard as my 91.

gman73

The best way to test the tunes is at a dyno and track. I don't have Brenspeeds tunes. I do have Doug's tunes. 87per. tune of course is better than stock, but doesn't have the low end power of the 91 tq tune. 91 race tune is a blast to drive on the street and has feels faster than the 91 tq tune, but it's not. I have yet to break into the 8s with the 91 race tune (track Density altitude is around 3000') yet I can get into the 8s with the 91 tq tune. Of course this is on an 1/8 mile track.