[ponjohn]

Originally Posted by Skip Fix

I did back to back on my TA just with the sway bar unhooked not off and no difference in hooking and sure did sway making the turn around at the end of the track.
Front skinny tires made a bigger difference than just the weight loss with them I guess rolling resistance.

My old ventura had a rack conversion and no sway bar at all. It was scary on long sweeping turns, it would push.

That car was meant to do one thing, go straight.

[HWYSTR455]

So is that the general/baseline math, 10th of a sec for every 100 lbs?

Thing with gears, cam selection needs to be in line for any gain there. Isn't it something like you want to be a peak HP RPM as you cross the line?

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[wheneaglesfly]

Originally Posted by HWYSTR455

So is that the general/baseline math, 10th of a sec for every 100 lbs?

Thing with gears, cam selection needs to be in line for any gain there. Isn't it something like you want to be a peak HP RPM as you cross the line?

.

Ideally Yes.
You want to be at Peak HP At 1320 foot mark.
Or at 1000 foot mark and cross 1320 mark 200-400 rpm.
Over.
Not over rev the engine.
Hydraulic Roller cams don't like being over revved.
Stuff breaks fast.

[wheneaglesfly]

Big torque engines like Pontiacs can cheat some.
But chasing down Tenths with available parts now.
Weight reduction can be done also.
Becomes less of a street car.
More like a gutted Race Car.

[wheneaglesfly]

Then a Taller rear tire can be used with a Lower gear ratio.
MPH Trap speeds increased in theory.
Big End MPH 800-1320 target goal.
ET reduction should follow.

[wheneaglesfly]

Transmission/Gear 1st 2nd 3rd 4th 5th 6th Reverse
Powerglide 1.76 1.00 - - - - 1.76
Powerglide 1.82 1.00 - - - -
TH200-4R 2.74 1.57 1.00 0.67 - - 2.07
TH350 2.52 1.52 1.00 - - - 1.93
TH400 2.48 1.48 1.00 - - - 2.00
TH700-R4 3.06 1.62 1.00 0.70 - - 2.29
4L60 / 4L60-E 3.06 1.62 1.00 0.70 - -
4L80E / 4L80-E 2.48 1.48 1.00 0.75 - -
C4 & C6 2.46 1.46 1.00 - - -
727 2.45 1.45 1.00 - - -
904 2.70 1.54 1.00 - - -
Borg-Warner T56 2.97 1.94 1.35 1.00 0.84 0.62 3.38

[wheneaglesfly]

Overall First Gear Ratio :
1 (Tranny Ratio x Rear Gear Ratio)

This indicates the mechanical advantage your car will
have coming off the line - higher number is better (up to a point)





Tranny/Rear Gear 2.41 2.56 2.73 3.08 3.23 3.31 3.42 3.55 3.70 3.73 3.91 4.10 4.56
PowerGlide 4.24 4.51 4.80 5.42 5.68 5.83 6.02 6.25 6.51 6.56 6.88 7.22 8.03
TH200-4R 6.60 7.01 7.48 8.44 8.85 9.07 9.37 9.73 10.14 10.22 10.71 11.23 12.49
TH350 6.07 6.45 6.88 7.76 8.14 8.34 8.62 8.95 9.32 9.40 9.85 10.33 11.49
TH400 5.98 6.34 6.77 7.64 8.01 8.21 8.48 8.80 9.18 9.25 9.70 10.17 11.31
TH700-R4 7.37 7.83 8.35 9.42 9.88 10.03 10.47 10.86 11.32 11.41 11.96 12.55 13.95
4L80E 5.98 6.35 6.77 7.64 8.01 8.21 8.48 8.80 9.18 9.25 9.70 10.17 11.31
Borg-Warner T56 7.16 7.60 8.11 9.15 9.59 9.83 10.16 10.54 10.99 11.08 11.61 12.18 13.54

[HWYSTR455]

Originally Posted by ponjohn

My old ventura had a rack conversion and no sway bar at all. It was scary on long sweeping turns, it would push.

That car was meant to do one thing, go straight.

That's still better than Chevy IIs, those things always go towards the wall!

.