Gear Selection
#1
Gear Selection
Need advice on gearing....Car is a C5 'Vette, M6 manual trans, roughly 1,100whp, 28" tire. I am wanting to go 8.90 - 9.0. I currently have 3.90 gears and with those gears I could theoretically hit 160mph @ 7500 RPM. Should I keep the 3.90s or go with 3.73s which theoretically give me 167 at the same RPM. Or should I go lower than 3.73s.
#2
TECH Fanatic
iTrader: (5)
If you have 3.90's then you are lower than 3.73. If you mean lower numerically like a 3.54 then, that would be geared higher or taller. Get a Moroso power speed calculator or get an app for your phone, those things have every tire size-gear-rpm scenario, you'll probably trap in 4th gear which is 1:1 and that's what those things are based on. IMO, you have the right gear now. Does your car have a cage? Youll be asked to leave if you run a big mph like that and you don't have one.
#4
I would run it with the gear you have to see where you are before changing anything.
An 8.90 ET should only take around 153 MPH or so on a well sorted car. Unless you have to run lower boost in the lower gears, then it may be getting up towards 160 MPH.
Al
An 8.90 ET should only take around 153 MPH or so on a well sorted car. Unless you have to run lower boost in the lower gears, then it may be getting up towards 160 MPH.
Al
#5
TECH Fanatic
Need advice on gearing....Car is a C5 'Vette, M6 manual trans, roughly 1,100whp, 28" tire. I am wanting to go 8.90 - 9.0. I currently have 3.90 gears and with those gears I could theoretically hit 160mph @ 7500 RPM. Should I keep the 3.90s or go with 3.73s which theoretically give me 167 at the same RPM. Or should I go lower than 3.73s.