Motor was just completed. 420w dynoed at 524hp at 5400rpm, peak torque 533 @ 4600rpm.

The car will be used for street/strip, can street slicks put this torque to the ground? How do you go about figuring opitmum gears? I've searched the forums and it sounds like the largest slick I can run is 9". A buddy who is helping me has recommended 26".

Tranny is a C4 being done by a local tranmission shop, converter is being custom made from the dyno sheet I gave them. I wanted to go JPT but they were quoting $2300 with converter and I just can't spend that much. The local guy buys some of his stuff from JPT and says they are the best and if he didn't build transmissions that's what he'd put in his car.

Caltracs are in the plan, as is a detroit locker.

Thanks,
Don

Thanks,
Don

quote:

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Originally posted by mainer:
I'm hoping to be high 11's with this engine.

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It should do way better than that, with traction. A DOT slick would be a minimum, but a drag slick would work best on the track. With that power, I don't see why you can be running high 10s or close to it.

Trying not to be an idiot about this but it's hard to figure out where to start. I was just playing around with this calculator but wasn't sure what variables I should put in/leave out. Should you use rpm at peak torque or peak hp? For a high 11 second car what mph should the car be at?

http://www.superford.org/garage/calculators/index.php#finding_rpm

I appreciate the advice,
Don

Thanks again,
Don

You've got a high 10 second car on your hands. Like my daughter's, it'll run mid 11's on street slicks with marginal traction. With CalTrac's, mono leaf springs, Rancho shocks, some front end mods and 10-26" slicks it will run mid/upper 10's. A 9" rear with 3.89 gears and a converter that stalls in the 4500 range will get you there. Have fun!

quote:

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Originally posted by mainer:
Will 28 spline hardened axels hold up or is it just a matter of time till the axel breaks or the splines twist?

{I'm using 28 splined axels from Moser at 10.60 ets}

Trying not to be an idiot about this but it's hard to figure out where to start. I was just playing around with this calculator but wasn't sure what variables I should put in/leave out. Should you use rpm at peak torque or peak hp? For a high 11 second car what mph should the car be at?

{High 11's can happen at 110+ mph on street slicks, or 120+ with no traction}

Don

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Can vouch for the 8" at 10 second ets though.

quote:

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Originally posted by steve'66:
Don,

You've got a high 10 second car on your hands. Like my daughter's, it'll run mid 11's on street slicks with marginal traction. With CalTrac's, mono leaf springs, Rancho shocks, some front end mods and 10-26" slicks it will run mid/upper 10's. A 9" rear with 3.89 gears and a converter that stalls in the 4500 range will get you there. Have fun!

SteveW

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Agreed! but a 4500 stall converter on the street is not very streetable. It boils down to the old premise of what do you want? a street car or a race car?
3.89 gears are good I'll agree, they give you multiple tire height selection.

quote:

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Originally posted by Mr. FoMoGO:
Street driven a lot 3.70
Street driven some 3.91
Street driven very little 4.10
You do have a 9" rear ?

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I like this kinda info.

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SCOOP

2.26 60'S
14.9 @ 90.86MPH

65 coupe,351w,C4,Big Boss 429 hood scoop,8" 3.40 TracLoc.