Supercharged M6 guys (and girls?)...
03-18-2010, 09:08 PM
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Supercharged M6 guys (and girls?)... First off if there are any ladies with a supercharged F-body here then holy hell, where have you been all my life?... JK
I was wondering what kind of rear end gear ratios u guys are running with your supercharged F bodies?
Specifically 4th gen F body with T56-M6. Please also list tire size OD.
I will be ordering a built rear end first in preparation for the procharger later on and wanna get the gearing right the first time. My goal is 500+ hp/torque.
Been searching but info is hit and miss. I would like some examples of ppl who actually own this setup and drive it. My car will be 75% street time, but want it to be setup for 1/4 mile without shifting out of 4th. Also couldn't find much info on this..I must be searching in the wrong place, or wrong key words. DURRR.
Thanks
I was wondering what kind of rear end gear ratios u guys are running with your supercharged F bodies?
Specifically 4th gen F body with T56-M6. Please also list tire size OD.
I will be ordering a built rear end first in preparation for the procharger later on and wanna get the gearing right the first time. My goal is 500+ hp/torque.
Been searching but info is hit and miss. I would like some examples of ppl who actually own this setup and drive it. My car will be 75% street time, but want it to be setup for 1/4 mile without shifting out of 4th. Also couldn't find much info on this..I must be searching in the wrong place, or wrong key words. DURRR.
Thanks
03-18-2010, 09:12 PM
#2
I run 3.89's in my 9in at the moment. Nice manners around town. I may want to switch to 3.70's because my car see's a lot of highway time so it'll bring the rpm down just a touch. I run 17in rims with Nitto 555R's at the moment. I havent ran it at the track with my 28x11.50 Mickeys yet. On the street, MPH wise I think I'd still be in 4th for the 1/4th.
03-18-2010, 09:26 PM
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Thanks. I was considering the 3.89s myself because I will also run that same tire on the street, Nitto 555R with 25.7" OD. My car does see alot of highway time but I don't care about sacrificing gas mileage by going to the shorter gears.
The Z already has an addiction to premium fuel, just like my right foot has an addiction to the floorboard. I wonder if there's a connection between those things? Hmm.
I don't beat on my car ALL the time, but I'm not scared to drive it like I stole it.
Going back to 3.70s isn't going to bring your rpm's down much at all. You should check out this gear/rpm/speed calculator-- http://xse.com/leres/ss/calculator.html
The Z already has an addiction to premium fuel, just like my right foot has an addiction to the floorboard. I wonder if there's a connection between those things? Hmm.
I don't beat on my car ALL the time, but I'm not scared to drive it like I stole it. Going back to 3.70s isn't going to bring your rpm's down much at all. You should check out this gear/rpm/speed calculator-- http://xse.com/leres/ss/calculator.html
Last edited by feelnlo; 03-19-2010 at 12:03 AM.
03-18-2010, 09:33 PM
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The two things I am concerned about in regards with going to a supercharger later are:
1. Traction in 1st gear (directly affected by rear end gearing)
2. Running out of gear in the 1/4 mile and hitting the rev limiter in 4th
Altho, if I ran out of gear I could always spin the motor a little past factory rev limit. But then you get into a whole different world. I need to research the effects of this on the engine. I'm not sure if a stock long block would like being over-revved while being force fed at 7~8psi.
Not to mention the stock T56 surely won't like being over-revved, right?
So many variables, I'm still working on my homework.
1. Traction in 1st gear (directly affected by rear end gearing)
2. Running out of gear in the 1/4 mile and hitting the rev limiter in 4th
Altho, if I ran out of gear I could always spin the motor a little past factory rev limit. But then you get into a whole different world. I need to research the effects of this on the engine. I'm not sure if a stock long block would like being over-revved while being force fed at 7~8psi.
Not to mention the stock T56 surely won't like being over-revved, right?
So many variables, I'm still working on my homework.
Last edited by feelnlo; 03-18-2010 at 09:42 PM.
03-18-2010, 10:06 PM
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3.89's with a 26X11.50 got the time in my sig (in 4th gear still). It will still get a little over 25 mpg on the hwy. Not that that was my concern with the car. 
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03-19-2010, 06:55 AM
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Are you planning on keeping with the stock bottom end in the engine, and keeping boost around 8 psi? If so, 4.11 gears will work just fine at the track. If you plan on forging the bottom end and cranking up the boost, then I'd go with 3.70 gears. Bob
03-19-2010, 09:22 AM
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Bob, thanks for the advice.
Its a tough call. Initially I plan to keep the stock bottom end with around 8psi. After that I may want to go forged and crank up the boost. I suppose that would be way later on down the road.
I assume you suggest the 3.70 gear for better hole-shot traction with the increased boost/power levels?
Kind of a noob question but, around how much boost is the max for pump gas/93 octane?
Its a tough call. Initially I plan to keep the stock bottom end with around 8psi. After that I may want to go forged and crank up the boost. I suppose that would be way later on down the road.
I assume you suggest the 3.70 gear for better hole-shot traction with the increased boost/power levels?
Kind of a noob question but, around how much boost is the max for pump gas/93 octane?
03-19-2010, 11:15 AM
#12
Bob, thanks for the advice.
Its a tough call. Initially I plan to keep the stock bottom end with around 8psi. After that I may want to go forged and crank up the boost. I suppose that would be way later on down the road.
I assume you suggest the 3.70 gear for better hole-shot traction with the increased boost/power levels?
Kind of a noob question but, around how much boost is the max for pump gas/93 octane?
Its a tough call. Initially I plan to keep the stock bottom end with around 8psi. After that I may want to go forged and crank up the boost. I suppose that would be way later on down the road.
I assume you suggest the 3.70 gear for better hole-shot traction with the increased boost/power levels?
Kind of a noob question but, around how much boost is the max for pump gas/93 octane?
14 psi is a good average for pump gas and a built engine with a good tune. Bob
03-19-2010, 01:09 PM
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I have 4.10 and bounce off the rev limiter in 4th @ 6700 a good little ways before crossing the line... Im thinking of switching to 3.90... It should put me right around 130mph before i hit the rev @ 6700...
Ive ran 11.4 @ 128 bouncing off the limiter in 4th.... Hope 3.90 will be enough gear to let me pass the traps without hitting the rev
Ive ran 11.4 @ 128 bouncing off the limiter in 4th.... Hope 3.90 will be enough gear to let me pass the traps without hitting the rev
