How do you pick a stall speed?

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Jan 3, 2003 | 08:50 AM

GregP

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Drifting

Joined: Aug 2000

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From: Annapolis MD

How do you pick a stall speed?

For new car, never run so no prior baselines. How to make a first guess.

Wt ~ 2800#
Since the car has never run before and there is no reference for a baseline, how do I get a good first guess?

Wt ~ 2800# (actually hoping for lower but don't know what I'll be able to get to)
Gear = 4.86:1
Tires = 29.5 x 15.50
HP ~ 550 @ 6000
TQ ~ 560 @ 4500

Thanks - Greg

Jan 3, 2003 | 02:11 PM

VetteLS6

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From: Albuquerque NM

Re: How do you pick a stall speed? (GregP)

Get some dyno time and choose from there. :blueangel:

Jan 3, 2003 | 03:28 PM

0ski_dwn_it

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From: St Marys PA

Re: How do you pick a stall speed? (VetteLS6)

Quote:

Get some dyno time and choose from there. :blueangel:

:iagree:

Everything I have always heard is you want your TC stall ~500 RPM less than max torque. :cheers:

Jan 3, 2003 | 09:49 PM

Russ Bellinis

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Re: How do you pick a stall speed? (GregP)

Are you building a prupose built drag racer or is it going to be a street/strip car? If it is built for drag racing only, 500 rpm below peak torque is probably fine. I think you would lose a lot of driveability on the street with it set up like that, though. You need to have a high enough stall speed so that your engine is making enough torque to get moving when the tc stalls. I think that is where you need to get a dynbo base line, so you know not only peak torque, but what does your torque curve look like?

Jan 3, 2003 | 11:45 PM

VetteLS6

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From: Albuquerque NM

Re: How do you pick a stall speed? (Russ Bellinis)

hey hey hey ....get to the dyno :lurk:

Jan 4, 2003 | 07:14 AM

DeenHylton

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From: Prineville Oregon

Re: How do you pick a stall speed? (GregP)

If this is going to be a drag-only car and it WILL only weigh 2800 lbs. it will go faster with a 2-spd. Powerglide...probably 90% of the 9.90 cars in NHRA run a glide. With a 4.88 gear your engine should be built to turn at least 7,600 RPM (and up). You'd also want to lose the locker and go with a spool if it's strip only. A strip converter for your setup will be from 4000-4500 stall. If you plan on seeing street duty it gets mighty uncomfortable much over 3200-3500 stall. Deen

Jan 6, 2003 | 08:16 AM

GregP

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Drifting

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From: Annapolis MD

Re: How do you pick a stall speed? (DeenHylton)

It's really a street car that will be raced maybe once or twice a year, which is why the 200-4R trans. From all the inputs I've received here and elsewhere it looks like around 1 3500 stall 9" lock-up converter will be the nominal choice.

Thanks - Greg