RPM's@the Stripe

[dm62409]

V- gate shifter should be a little guicker than a H- pattern simply because there is virtually no neutral gate between gear changes as compared to the rather large neutral gate of the H- pattern. Ultimately cluchless trans is the quickest as your in the next gear before it backs out of previous gear. Also not clutching on gear changes. Only problem is cost, and fitting into tight floor tunnels.

 

[Iowa 409 Guy]

I've noticed the lack of black marks on the highway between gears when power shifting. It will suprise you on the distance. Lot's of time lost. Probably no way to calculate that, but I'm sure it's significant.

 

[RCampbell]

I've noticed the lack of black marks on the highway between gears when power shifting. It will suprise you on the distance. Lot's of time lost. Probably no way to calculate that, but I'm sure it's significant.

A data logger shows it very clearly.... .10-.15

 

[Iowa 409 Guy]

Wow...thanks Russ. I'm hillbilly low tech.

 

[chevytaylor]

Think of it like a tractor. A tractor has a deep gearing. What happens when you open the tractors throttle and you pop the clutch?...the front wheels come off the ground and you better hold to the steering wheel.


We run a 3.06 first gear and 5.83 rear gear. The car is in second before the 60' lite!

This is a really cool discussion thank you Dave. Many factors involved, but to put things into perspective and if you don't mind me asking Russ, weight of car, diameter of rear tire, engine cubic inches, shift RPM, peak torque/HP at what RPM and finish line RPM? Oh, and what gear box and shifter?

 

[RCampbell]

Car weighs 3220. Tire rolls out 102". Motor is .060 over 426...NHRA SS legal. Launches at 66-6800. Shifts at 9200. Crosses at 9-9100. We are considering a 6.00 gear which would run us to 94-9500 in the lites The motor in the car is just under 1000hp. I have slept since we dynoed it last... hp peak was around 9000. As I recall torque was right around 900. We ran Liberty 4 spd for years. Car currently has a prototype GF2400 4 sod with a Long shifter.
Our best 60' is 1.24 with the rear tires... probably 1.14. In the heat the car will run 8.50s at 157. Which only puts us in the middle of the field...looks like we will be able to start the season with the new motor.

 

[Fathead Racing]

I have a 3.06 first gear with a 4:56 rear and 28" tire. I can attest that in the blink of an eye I am pounding second gear. The torque when second gear starts to pull is unbelievable.

 

[chevytaylor]

Car weighs 3220. Tire rolls out 102". Motor is .060 over 426...NHRA SS legal. Launches at 66-6800. Shifts at 9200. Crosses at 9-9100. We are considering a 6.00 gear which would run us to 94-9500 in the lites The motor in the car is just under 1000hp. I have slept since we dynoed it last... hp peak was around 9000. As I recall torque was right around 900. We ran Liberty 4 spd for years. Car currently has a prototype GF2400 4 sod with a Long shifter.
Our best 60' is 1.24 with the rear tires... probably 1.14. In the heat the car will run 8.50s at 157. Which only puts us in the middle of the field...looks like we will be able to start the season with the new motor.

Thank you for sharing that info Russ A whole different leagueThose Hemi's sure can run man!!!

 

[chevytaylor]

Dave. With car @ 4200+lb's, 474 inches, 530hp, do you know where the peak RPM is for torque and HP?

 

[Iowa 409 Guy]

Hr636 insky cam I think is around 55-5800 rpm. Can't get at info right now.

 

[RCampbell]

Not so different. Like they tell me... doesn't matter who the manufacturer is... all the parts go round and round and up and down!

I'll show my age...we began racing 409s in 1988...doing exactly what everyone is doing now. Had lots of fun. Would still be racing the Belair if pro nostalgia was still around

 

[La Hot Rods]

I need to figure out how to get in on one of Russ's racing trips.
No I didn't stay at a Holiday Inn Express last night but I did crew for Big Daddy.

 

[RCampbell]

James you might want to reconsider...Mopar guys are kinda strange. You might want to wear a paper bag... so the Chevy guys don't recognize you!!

 

[La Hot Rods]

I ain't scared.
I could just say something dumb and you find that .010th you been looking for.

 

[Ishiftem]

James you might want to reconsider...Mopar guys are kinda strange. You might want to wear a paper bag... so the Chevy guys don't recognize you!!

He has a pony tail so I think he'll blend right in. Might no have enough tattoos though.

 

[chevytaylor]

This chart could be helpful.......................................http://www.dickcepek.com/warranties...circumference-and-revolutions-per-mile-chart/