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*Jeff240sx* · 03-29-2002, 12:50 PM

Hey man.
I don't think that I would raise the ratio with a turbo.  If anything, it would seem logical to want to be in the turbo spool up for as long as you could.
Plus, you would have to do a map of your gears, to find out what rpms each shift would put you at, and if it is in the turbo spool-up area, or below it.
Running the numbers on CarTest:
Stock
0-60 - 7.2
1/4 mile - 15.8 @ 87.8mph in 4th
Top Speed - 133
EPA - 23.3 combined
Swapped ring and pinion
0-60 - 7.4
1/4 mile - 15.7 @ 88.4mph
Top Speed - 129
EPA - 21 combined

I wouldn't do it.  If anything, I'd lower the ratios, like 300zx tt's have 3.86 or something, and Silvias have 3.7-ish.  That is for more time in the boost zone.
-Jeff

03-29-2002, 12:50 PM	#2
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0)	Hey man. I don't think that I would raise the ratio with a turbo.  If anything, it would seem logical to want to be in the turbo spool up for as long as you could. Plus, you would have to do a map of your gears, to find out what rpms each shift would put you at, and if it is in the turbo spool-up area, or below it. Running the numbers on CarTest: Stock 0-60 - 7.2 1/4 mile - 15.8 @ 87.8mph in 4th Top Speed - 133 EPA - 23.3 combined Swapped ring and pinion 0-60 - 7.4 1/4 mile - 15.7 @ 88.4mph Top Speed - 129 EPA - 21 combined I wouldn't do it.  If anything, I'd lower the ratios, like 300zx tt's have 3.86 or something, and Silvias have 3.7-ish.  That is for more time in the boost zone. -Jeff __________________ Whatup?