FCar2000TA

iTrader: (7)

Do 4.10 gears cause more parasitic loss than the stock gears in a T56 car???

alamantia

iTrader: (10)

no more than any other ratio

FCar2000TA

iTrader: (7)

I have been told that 4.10s will soak up 10 RWHP over stock gears. This comes from a very reputable source.

BlackScreaminMachine

iTrader: (17)

GMHTP when they did the Grapes of Wrath artical showed like a 1-2 hp decease and they mentioned a past car that had a 4.10 losing 3-4, but again its frictional loss.

What you gain in performance will out weigh the peak #

keliente

iTrader: (22)

Jeez who cares, you can't race on a dyno anyway. I did 4.10s and lost four tenths at the track, that was worth whatever horse power "went missing".

alamantia

iTrader: (10)

Backlash has an effect on drag of hypoid gear sets, differenttypes of gear sets require different increments of backlash. Stock gears are set as low as 0.002" where aftermarket sets can go as high as 0.012" I could only assume that would be the factor right there. Chances are that if you are going from Stock GM 273"s 323's or 342's and setting up 4.10"s that the 4.10's would be aftermarket resulting in a different backlash. In the artical did it say anything about this?

alamantia

iTrader: (10)

heres the answer, and who knew it would be so simple...

http://www.sdp-si.com/D220/PDF/D220T079.pdf

see?

FCar2000TA

iTrader: (7)

my braincells are commiting suicide now

alamantia

iTrader: (10)

serioulsy, what the hell was that? Id just install them and enjoy them.

99zman

iTrader: (23)

ive seen 5-10hp rwhp loss.

DaGeneral

iTrader: (3)

Install them, then go out and punch it from about 15mph(assuming you have an M6)...when you get sideways, we'll remind you exactly how much power you lost. It's a kickass feeling...screw HP, like they said earlier, you don't race on the dyno.

austin21

**** HP you now have TQ ...MUCH BETTER

alamantia

iTrader: (10)

Yeah torque moves a car HP just keeps it moving

Zepher

I know that when we dyno'd my friends 99 HOSS after putting in the 4.10's it showed a 10hp loss, but the car picked up about 5mph and dropped 7tenths in the 1/4 mile (13.9 stock, 13.2 with 4.10's).
LPE Cam and longtubes dropped the ET to 12.01.

Smoke Panther

iTrader: (10)

If it's so reputable, why don't you post up that source?

The drop in your 60' has been proven to offset w/e you lose in peak HP. If that wasn't true, people would go slower when doing a gear swap, not faster

chicane

Uhm... no.

And that link to the 'basic principals or power-loss determination' has nothing to do with hypoid/complex helical gear sets.

Proud2bSS

iTrader: (2)

Ed Zachery....totally differing systems

alamantia

iTrader: (10)

Foamys smart

davered00ss

iTrader: (4)

I did 4.10's at the same time as my Spec stage 3 clutch with billet steel flywheel & and LS6 intake and put down the same rwhp. so I assumed I lost whatever the LS6 gained me. roughly 10rwhp?

ForumMoto

For all of you that have dropped your gears, how is it on the freeway? I drive my car around alot, but was thinking of 3.73's or even 4.10's if it isn't going to affect my driveability and freeway mileage that bad
-Jason