BADFNZ

iTrader: (19)

I have a 4600 stall and 3.23 gears, which means it's unGodly loose on the street.

Let's say I have a TR224 making 345 ft/lbs of torque @ 3k RPM. Let's also say that hypothetically, I went to a bigger cam which makes 320 ft/lbs of torque @ 3k.

So 320/345=.93, meaning I'll be making 7% less power at 3k.

Now let's also say I have a set of 3.42s sitting in my garage which I can throw in to help with the looseness.

So 3.23/3.42=.94 meaning I'll have 6% more gear.

Since 6%<7%, does this mean the converter will feel even more loose or does this equation not work in this situation?

Sorry for all the math and hypotheticals

SStrokerAce

iTrader: (2)

Are we just talking about street driving or are you concerned more with track performance?

Bret

BADFNZ

iTrader: (19)

Not worried at all about performance, just trying to make it feel less loose on the street. But if you had something to add about performance, I'm interested.

SStrokerAce

iTrader: (2)

Well the lower TQ around stall will bring down the stall RPM, and the bigger gear will let you drive around at a higher RPM where there is less slippage so it will not feel as loose.

That help?

I'm just thinking about the match of the cam to the RPM range of the motor (stall to shift point) and how the gears should be matched to that in terms of weight, power, tire size etc....

Bret

BADFNZ

iTrader: (19)

I agree, which is why I'm going to a bigger cam in the first place. The shift extension is 6100 and my shifts are at 6500, so I have a very narrow RPM range, which the TR224 isn't built for. I need to shift my peak up a bit in order to take advantage of the RPM range, hence the bigger cam.

And considering the small RPM range and slippage, I don't think there will be that much of a difference in RPM through the traps from a 3.42 to say a 3.73 or something. This is with a pretty much stock weight and a 26" tire. Yeah I might get a slightly better advantage with the 3.73, but since I'm still on the 10-bolt, I think the 3.42 might be a better choice.

BADFNZ

iTrader: (19)

Anyone else?

SStrokerAce

iTrader: (2)

No you are right on target

Tech

iTrader: (1)

Put steeper gears in.

PREDATOR-Z

3:42's will not help much IMO, I would go minimum 3.73
I drive a similar range cam 224/220 and a VIG 3200 2.5 str with 3.73's and at proper idle you can feel some looseness but it does fine.
For A4's 3.73's are good gears.