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

General engine tech -- Drag Racing to Circle Track

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Dragginwagon406
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by Dragginwagon406 »

Monza355 wrote: Tue Nov 23, 2021 5:12 am
vortecpro wrote: Tue Nov 23, 2021 4:13 am The beauty this build is the pure street ability, GM engineered converter, 2.56 gear, Cooper street radial tires, just a super fun car you can drive any where with the factory type drive line, no OD trans which I like a lot. Of course I told Mike this could be done, many thought I was crazy, but Mike made it happen with this survivor Monte, nice work! I can't wait to build my version: A 1970 ElCamino with a 2.56 gear, factory converter, and 650 HP with a lighter tire rim combination and a street drag radial, should be very interesting.
What’s the approximate stall speed of this converter and is it a 12” or 13” unit ?
I can't tell you, I don't have a tach in the car.
Monte Interior.jpg

The factory converter is tight, but not as tight as a TH400 from an RV, tight.

The factory converter is loose, but not 10" Hughes, 3500 rpm loose.

I can't remember for sure, I did measure them, but I didn't take a photo (very much unlike me). I think it is about 11.25". The TH400 RV converter was 13" plus (might have been 14") and of course, the Hughes is 10".

The stud is in the middle :mrgreen:

Converters.jpeg
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Last edited by Dragginwagon406 on Tue Nov 23, 2021 6:00 am, edited 1 time in total.
1.88, 11.84 @ 119.27, 4100 lbs, 2.56 gears, stock stall, 225/70-15 Cooper Cobras
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by Dragginwagon406 »

vortecpro wrote: Tue Nov 23, 2021 4:13 am The beauty this build is the pure street ability, GM engineered converter, 2.56 gear, Cooper street radial tires, just a super fun car you can drive anywhere with the factory type drive line, no OD trans which I like a lot. Of course I told Mike this could be done, many thought I was crazy, but Mike made it happen with this survivor Monte, nice work! I can't wait to build my version: A 1970 El Camino with a 2.56 gear, factory converter, and 650 HP with a lighter tire rim combination and a street drag radial, should be very interesting.
I agree, super fun car and glad I built it this way. Thank you!

Most of all, thanks for sharing your knowledge. Your 620 hp 467 videos are top notch. I studied them relentlessly, and took notes.

I can't wait to see your build come to life. It'll be hard to imagine you not going 10s, every other big block Chevy you've built has run 10s (peanut port, and I'm sure the smooth idle 427 will too) :mrgreen:
1.88, 11.84 @ 119.27, 4100 lbs, 2.56 gears, stock stall, 225/70-15 Cooper Cobras
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by Rick! »

vortecpro wrote: Mon Nov 22, 2021 4:55 pm Although he did see negative air early on in the day, theres still the fact the baro was under 29.2, just remember 0 DA in a 29.2 baro IS NOT the same as a 0 DA in a 30.30 baro.
It was mineshaft air most of the day. Here is the the processed weather data from airdensityonline for US 131 November 5, 2021. The correction factors use Pat Hale type formulas for each fuel type.
The correction factors were below 1.00 to barely above 1.00. Typical CFs are 1.03 to 1.06 for "average air". DA is just a temporary calculation to get to a proper SAE correction factor using Temp, Baro, Humidity and a real fancy expression to calculate water vapor pressure.

Image
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by maxracesoftware »

for a Weather HP Correction Factor = 1.0000 i calculate 507.6 Peak HP occured at 733 Feet distance

if i understood correctly , it was in 2nd Gear thru the 1/4 Mile ??
 
VortecPro_1970_MonteCarlo_ZeroHPCF.jpg
VortecPro_1970_MonteCarlo_ZeroHPCF_733Ft.jpg
 
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by vortecpro »

Yes, second gear, your input is always appreciated.
Racing a NA NHRA stocker should be mandatory before any posting.
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by Dragginwagon406 »

Rick! wrote: Tue Nov 23, 2021 7:44 am
vortecpro wrote: Mon Nov 22, 2021 4:55 pm Although he did see negative air early on in the day, theres still the fact the baro was under 29.2, just remember 0 DA in a 29.2 baro IS NOT the same as a 0 DA in a 30.30 baro.
It was mineshaft air most of the day. Here is the the processed weather data from airdensityonline for US 131 November 5, 2021. The correction factors use Pat Hale type formulas for each fuel type.
The correction factors were below 1.00 to barely above 1.00. Typical CFs are 1.03 to 1.06 for "average air". DA is just a temporary calculation to get to a proper SAE correction factor using Temp, Baro, Humidity and a real fancy expression to calculate water vapor pressure.

Image
First run was at 11:30 AM, last run at 12:30 PM.

The Draggy gives the DA in the screenshot. Only the last pass was flatfooted.
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1.88, 11.84 @ 119.27, 4100 lbs, 2.56 gears, stock stall, 225/70-15 Cooper Cobras
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by maxracesoftware »

vortecpro wrote: Tue Nov 23, 2021 10:42 am Yes, second gear, your input is always appreciated.
i had a 1970 or was it 1972 dark brown Monte Carlo back then ( bought it brand new , can't remember the Year though :) 1970 or 72 Model :lol:
getting too old :lol:
i have a old Pic of it somewhere in suitcases in a closet
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by maxracesoftware »

Dragginwagon406 wrote: Tue Nov 23, 2021 10:50 am
Rick! wrote: Tue Nov 23, 2021 7:44 am
vortecpro wrote: Mon Nov 22, 2021 4:55 pm Although he did see negative air early on in the day, theres still the fact the baro was under 29.2, just remember 0 DA in a 29.2 baro IS NOT the same as a 0 DA in a 30.30 baro.
It was mineshaft air most of the day. Here is the the processed weather data from airdensityonline for US 131 November 5, 2021. The correction factors use Pat Hale type formulas for each fuel type.
The correction factors were below 1.00 to barely above 1.00. Typical CFs are 1.03 to 1.06 for "average air". DA is just a temporary calculation to get to a proper SAE correction factor using Temp, Baro, Humidity and a real fancy expression to calculate water vapor pressure.

Image
First run was at 11:30 AM, last run at 12:30 PM.

The Draggy gives the DA in the screenshot. Only the last pass was flatfooted.
What Software/Hardware are you using for those 3 ScreenShots ??
..... very close to my calculations :D
VortecPro_1970_MonteCarlo_2.jpg
 
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by maxracesoftware »

Found it : https://dragymotorsports.com/

 
VortecPro_1970_MonteCarlo_1600Ft.jpg
 
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PipeMax v4.70 Download Link : https://www.maxracesoftwares.com/forum/ ... .php?id=57
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by Dragginwagon406 »

maxracesoftware wrote: Tue Nov 23, 2021 11:16 am
Dragginwagon406 wrote: Tue Nov 23, 2021 10:50 am
Rick! wrote: Tue Nov 23, 2021 7:44 am

It was mineshaft air most of the day. Here is the the processed weather data from airdensityonline for US 131 November 5, 2021. The correction factors use Pat Hale type formulas for each fuel type.
The correction factors were below 1.00 to barely above 1.00. Typical CFs are 1.03 to 1.06 for "average air". DA is just a temporary calculation to get to a proper SAE correction factor using Temp, Baro, Humidity and a real fancy expression to calculate water vapor pressure.

Image
First run was at 11:30 AM, last run at 12:30 PM.

The Draggy gives the DA in the screenshot. Only the last pass was flatfooted.
What Software/Hardware are you using for those 3 ScreenShots ??
..... very close to my calculations :D

VortecPro_1970_MonteCarlo_2.jpg
 
Very nice program you have there.

It's the Draggy app, which works with the Draggy Performance Meter.

dragy 10Hz GPS Based Performance Meter https://www.amazon.com/dp/B077KKPMTB/re ... 0GQASMF91W

I mount my iPhone 10 with extended battery using this phone mount.

Car Phone Mount - Cell Phone Holder for Car Windshield Compatible with iPhone X XS Max XR 8 Plus 7 Plus 6S Plus 6 Plus SE Samsung Galaxy S9, S8, S8 Plus, Note 8, S7, S6, S5, Google Pixel XL by DaVoice https://www.amazon.com/dp/B00Q3I8H8...a ... UTF8&psc=1
1.88, 11.84 @ 119.27, 4100 lbs, 2.56 gears, stock stall, 225/70-15 Cooper Cobras
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by BobbyB »

Dragginwagon406 wrote: Tue Nov 23, 2021 10:50 am
Rick! wrote: Tue Nov 23, 2021 7:44 am
vortecpro wrote: Mon Nov 22, 2021 4:55 pm Although he did see negative air early on in the day, theres still the fact the baro was under 29.2, just remember 0 DA in a 29.2 baro IS NOT the same as a 0 DA in a 30.30 baro.
It was mineshaft air most of the day. Here is the the processed weather data from airdensityonline for US 131 November 5, 2021. The correction factors use Pat Hale type formulas for each fuel type.
The correction factors were below 1.00 to barely above 1.00. Typical CFs are 1.03 to 1.06 for "average air". DA is just a temporary calculation to get to a proper SAE correction factor using Temp, Baro, Humidity and a real fancy expression to calculate water vapor pressure.

Image
First run was at 11:30 AM, last run at 12:30 PM.

The Draggy gives the DA in the screenshot. Only the last pass was flatfooted.
Very very cool! Have you tested your 60 foot &/or 0 to 60 on the street with your Dragy? Mind sharing?
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by PackardV8 »

Those who want 2.56 gears and a TH400 to run on the strip, well good on 'em and they're going faster than most.

Those with experience, what would this combo turn with the optimum rear gear through a TH200-4R, TH700R4 or a TH400-GearVendors tranny setup?
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by Dragginwagon406 »

maxracesoftware wrote: Tue Nov 23, 2021 11:48 am Found it : https://dragymotorsports.com/

 
VortecPro_1970_MonteCarlo_1600Ft.jpg

 
Could you estimate my speed at 1/2 mile?

I’ve considered trying a 1/2 mile race.
1.88, 11.84 @ 119.27, 4100 lbs, 2.56 gears, stock stall, 225/70-15 Cooper Cobras
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by Dragginwagon406 »

BobbyB wrote: Tue Nov 23, 2021 11:50 am
Dragginwagon406 wrote: Tue Nov 23, 2021 10:50 am
Rick! wrote: Tue Nov 23, 2021 7:44 am

It was mineshaft air most of the day. Here is the the processed weather data from airdensityonline for US 131 November 5, 2021. The correction factors use Pat Hale type formulas for each fuel type.
The correction factors were below 1.00 to barely above 1.00. Typical CFs are 1.03 to 1.06 for "average air". DA is just a temporary calculation to get to a proper SAE correction factor using Temp, Baro, Humidity and a real fancy expression to calculate water vapor pressure.

Image
First run was at 11:30 AM, last run at 12:30 PM.

The Draggy gives the DA in the screenshot. Only the last pass was flatfooted.
Very very cool! Have you tested your 60 foot &/or 0 to 60 on the street with your Dragy? Mind sharing?
I tried one time before rebuilding the suspension and boxing the rear arms, but I haven’t tried since. Not representative of what it could do now.

1/8 mile was 2.35, 8.65 @ 88.47.

I won’t run out a 1/4 mile on the street.
1.88, 11.84 @ 119.27, 4100 lbs, 2.56 gears, stock stall, 225/70-15 Cooper Cobras
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Re: 2.56 Gear, Stock Converter, 4100 Pounds, NA 11s?

Post by In-Tech »

PackardV8 wrote: Tue Nov 23, 2021 12:36 pm Those who want 2.56 gears and a TH400 to run on the strip, well good on 'em and they're going faster than most.

Those with experience, what would this combo turn with the optimum rear gear through a TH200-4R, TH700R4 or a TH400-GearVendors tranny setup?
Back in '83 my '73 4300lb camino ran 11.86 at 129 with 3.42 gears, more tire, think it was pro trac's n50/15, don't remember if I got out of second gear T400 stock 350 furnace brazed convertor. 12"
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