question about aluminum ds

[CBus 06 GT]

Not shifting out of 3rd isn't really a good thing. Gears are a torque multiplier, they get you to the sweet spot faster. Only using 3 gears seems like a lazy sorta run and your not getting the full potential of your engine. If your pounding 6,200 rpm's through 4 gears in the 1/4, your humping. I maybe looking at this all wrong, but with my 4:30's, it screams, the power stays on tap. It pulls hard through 4 gears. It's a lot quicker than it was with the 3:31's. Like I say, I might be looking at this all wrong, but with 3:55's your scrubing off some speed it seems to me.

It will really depend on the spread of power. If an engine has a narrow powerband where it makes good torque/HP over a narrow range of RPM, then you want to gear it so you shift 3 times (i.e. use 1st-4th). If you have a broader power curve like with a positive displacement blower, then a 2 shift run may be the way to go. Obviously, there are lots more variables than just that, you have to consider vehicle weight, how hard you can launch/available traction, and how quick you are with your shifts. With an N/A S197 running on DR's, changing the rear to 4.30 and getting a 3rd shift and carrying 6000+RPMs in 4th through the traps is probably the way to get the quickest E.T.

 

[TGJ]

What kind of gains are people seeing with the Spydershaft?

2 - 3 tenths and 1 - 2 MPH regardless if you are F/I or N/A...

Not shifting out of 3rd isn't really a good thing. Gears are a torque multiplier, they get you to the sweet spot faster. Only using 3 gears seems like a lazy sorta run and your not getting the full potential of your engine. If your pounding 6,200 rpm's through 4 gears in the 1/4, your humping. I maybe looking at this all wrong, but with my 4:30's, it screams, the power stays on tap. It pulls hard through 4 gears. It's a lot quicker than it was with the 3:31's. Like I say, I might be looking at this all wrong, but with 3:55's your scrubing off some speed it seems to me.

I have tried shifting 1 - 4 and 1 - 3. I run slower E.T.s when I shift to 4th but I MPH higher. I run faster E.T.s when I stay in 3rd but MPH lower. I will trade MPH for a faster E.T. every day of the week. I have 3.55's with 26/11.5/17 MT ET Street Bias-ply tires when I race.

 

[shaftmasters]

what do you guys/gals recommend for an aluminum ds......site,name?

if you are at stock height, do you have to change the pinion angle?

For anyone interested:
http://cgi.ebay.com/ebaymotors/Alum...006QQitemZ160280012760QQrdZ1QQsspagenameZWDVW

 

[NastyStang113]

You will see more gains with a F/I setup, but maybe 2 tenths on an otherwise stock car.

I personally like the stock 355 gear, because you dont have to shift out of third in the 1/4.

Uhhh ... How do you figure there is more of a gain with F/I?

 

[walter]

Has anyone had any experience with the Roush 26lb driveshaft they put in their Drag Pak cars?