2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

[Dragginwagon406]

by Dragginwagon406 » Sun Nov 28, 2021 8:29 am
maxracesoftware, would you be willing to make another analysis of a friend's 427 SB Monte,
for comparison? I'll graph his from your numbers the same way,
and overlay them for comparison. Hp wise, they're fairly close (although, I have more torque).
His is much closer to ideal on the car so it should be interesting to see them graphed together.

you forgot to state :
1]= Car weight w/Driver ??
2]= does he have Cowl Induction , HoodScoop , or no Ram-Air device whatsover ??
3]= what type of rear Tires ?? real Slicks or very good DOT Street Tires ??

1. He says 4050, but it's hard for me to understand where an aluminum-headed small block is picking up its heft.
2. He has a fiberglass cowl hood but no ram air
3. Sticky rear tires: ET Streets R bias ply. 28/11.5/15 "[the wheels] They're weld knockoffs from Jegs. SSR Spikes 15x4 1.75 bs / 15x8 4.5 bs. They're light as well. I saved over 50lbs from my Centerline combo."

Thanks for your efforts.

[maxracesoftware]

i need more Info to be sure of my results :
1]= what are Trans Gear Ratios
2]= whats the rear gear ratio
3]= whats the Stall RPM
4]= whats the Shift RPM
5]= whats the Cross or Finish Line RPM

[Dragginwagon406]

i need more Info to be sure of my results :
1]= what are Trans Gear Ratios
2]= whats the rear gear ratio
3]= whats the Stall RPM
4]= whats the Shift RPM
5]= whats the Cross or Finish Line RPM

Amend to 3800 lbs
TH350, 2.52, 1.52
411 gears 9 in
4000 stall (4500 pk tq from dyno)
shift rpm is 6000 2nd, 6500 drive
Cross the stripe at 6500

[1980RS]

Draggon, you better watch out. I might be looking for a 4100 lbs. car with 2.56 gears to put my new 468 in, but I will have to tell you I for sure will run some converter in the car. Projects like yours keep testing stuff alive and well.

[Dragginwagon406]

Draggon, you better watch out. I might be looking for a 4100 lbs. car with 2.56 gears to put my new 468 in, but I will have to tell you I for sure will run some converter in the car. Projects like yours keep testing stuff alive and well.

Go for it!

The irony is, if more people built their cars like this, more would enjoy them more and keep them longer. The car is so easy to drive and so much fun to drive around.

[BLSTIC]

"My squirrel mind can only imagine the dozens of mechanical landmines which await a 51 year old car during a 1, 2, 3, or 4 mile race."

I remember years ago seeing finsh line pictures of stock bodied muscle cars with big horsepower, many seeing speeds well over 150 mph. Some of the pictures showed fenders and hoods all warped out of shape from the poor aerodynamic nature of the bodies. The one that really stood out was a car that had the front wheels a couple of inches off the ground going through the traps at the end of the track.

Yeah, our understanding and application of aerodynamics has come a long ways in production cars. The fact these cars don't even have a proper excluder to keep hot engine compartment air from being recycled through the radiator is entertaining.

At a minimum, a chin spoiler would be in order for a high speed run, but probably a roll of duct tape too

If you ran a smooth front undertray that went from said chin spoiler to at least as far back as the lowest part of the sump and/or crossmember you'd likely reduce air pressure in and under the engine bay noticeably. You'd probably increase air pressure in front of the radiator too depending on how the original car was designed.

Do that along the entire car and you might even end up with a car that's only half trying to kill you at high speed.

[maxracesoftware]

i need more Info to be sure of my results :
1]= what are Trans Gear Ratios
2]= whats the rear gear ratio
3]= whats the Stall RPM
4]= whats the Shift RPM
5]= whats the Cross or Finish Line RPM

Amend to 3800 lbs
TH350, 2.52, 1.52
411 gears 9 in
4000 stall (4500 pk tq from dyno)
shift rpm is 6000 2nd, 6500 drive
Cross the stripe at 6500

the Dyno Sheet shows a bunch of really low BSFC readings
hard to say whats going on there ??
Inertia Factor= 1.27

Wallace Calculator shows : between 476.4 HP -to- 516.4 HP
... i get close to same thing as the Wallace Calculator

AL 427_Wallace_Calculator.jpg

AL 427_ETA_487HP.jpg

 

He would need to Run something like these 2 Simulations
to show up what's on his Dyno Sheet :

AL 427_ETA_Pro.jpg

AL 427_QuarterPro.jpg

[Dragginwagon406]

i need more Info to be sure of my results :
1]= what are Trans Gear Ratios
2]= whats the rear gear ratio
3]= whats the Stall RPM
4]= whats the Shift RPM
5]= whats the Cross or Finish Line RPM

Amend to 3800 lbs
TH350, 2.52, 1.52
411 gears 9 in
4000 stall (4500 pk tq from dyno)
shift rpm is 6000 2nd, 6500 drive
Cross the stripe at 6500

the Dyno Sheet shows a bunch of really low BSFC readings
hard to say whats going on there ??
Inertia Factor= 1.27

Wallace Calculator shows : between 476.4 HP -to- 516.4 HP
... i get close to same thing as the Wallace Calculator
AL 427_Wallace_Calculator.jpg

AL 427_ETA_487HP.jpg





 

He would need to Run something like these 2 Simulations
to show up what's on his Dyno Sheet :
AL 427_ETA_Pro.jpg
AL 427_QuarterPro.jpg

That’s great! Thank you, greatly appreciated.

His ET outperforms his mph, quite the opposite of my results. To me, It would appear that there must be an explanation, either he let off before the end, or the engine is going flat somewhere (maybe even at high rpm), or maybe a really bad headwind?

Would you tend to agree? I’ll graph his against mine tonight, should be interesting.

[econo racer]

What are yall trying to do? See who can pull a camper at 120 mph?

[vortecpro]

Victor's right hand drive LS5 Vortecpro 467 fully loaded 1970 Monte Carlo, Turbo 400, power everything, 467 4200 pounds, 3.55 gear, 11.0 @ 122 NA driver.

[vortecpro]

Draggon, you better watch out. I might be looking for a 4100 lbs. car with 2.56 gears to put my new 468 in, but I will have to tell you I for sure will run some converter in the car. Projects like yours keep testing stuff alive and well.

Your testing keeps me alive and well, its very much appreciated in my shop! I'm still waiting for you to get on me with your peanut port combo LOl
Can't wait to test my stuff in this 30.0 baro, under 500 feet DA I live in now, NO MORE 8000-10,000 DA for me!

[Dragginwagon406]

Victor's right hand drive LS5 Vortecpro 467 fully loaded 1970 Monte Carlo, Turbo 400, power everything, 467 4200 pounds, 3.55 gear, 11.0 @ 122 NA driver.

It’s a beautiful car, and Victor does a nice job getting the power down on the track.

It’s going to be interesting to see what 44 more cubic inches of VortecPro power can do when dropped into a 13-Second street car.

[vortecpro]

Amend to 3800 lbs
TH350, 2.52, 1.52
411 gears 9 in
4000 stall (4500 pk tq from dyno)
shift rpm is 6000 2nd, 6500 drive
Cross the stripe at 6500

the Dyno Sheet shows a bunch of really low BSFC readings
hard to say whats going on there ??
Inertia Factor= 1.27

Wallace Calculator shows : between 476.4 HP -to- 516.4 HP
... i get close to same thing as the Wallace Calculator
AL 427_Wallace_Calculator.jpg

AL 427_ETA_487HP.jpg





 

He would need to Run something like these 2 Simulations
to show up what's on his Dyno Sheet :
AL 427_ETA_Pro.jpg
AL 427_QuarterPro.jpg

That’s great! Thank you, greatly appreciated.

His ET outperforms his mph, quite the opposite of my results. To me, It would appear that there must be an explanation, either he let off before the end, or the engine is going flat somewhere (maybe even at high rpm), or maybe a really bad headwind?

Would you tend to agree? I’ll graph his against mine tonight, should be interesting.

How do you figure that? 1320/118.24=11.16 And again thats just a jumping off point, typically when I have 119 MPH HP I have a 10.90 car, look closely at Larry's simulations of the first 60 and 330 feet. Its one thing to make power-its another thing to utilize the power.

[408 Nova]

Take a 1970 Monte Carlo on street radial tires, bone stock survivor with a 2.56 gear, Turbo 350 with the factory stock GM TQ converter, add a 496 with 9.8 compression with a 228 @ .050 hyd roller and GM 049 heads-will it run 11s?

An interesting comparison would be my 2019 Dodge Challenger 1320.

It run almost exactly what this Monte Carlo runs.

This Dodge weighs around 4500lbs with me in it. It has 485 hp net, 8 forward gears, stock 2200 converter, and a 3.09 rear gear on factory 28.5" tall drag radials.

On average, it sixty's a 1.65, 1/8 mile et is a 7.60 at 93 mph, and 11.85 at 115 in the 1/4 mile, in 1000 foot air.


I'm thoroughly impressed with this Monte Carlo for sure.

[77cruiser]

What are yall trying to do? See who can pull a camper at 120 mph?

There is a record for that.