Gearing/converter to match engine dyno. - Chevelle Tech
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post #1 of 14 (permalink) Old Jul 10th, 19, 5:02 PM Thread Starter
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Gearing/converter to match engine dyno.

Hey guys just got the engine on the dyno big block with 026 gm Rec port heads. Vic jr and a 950hp 4150. Going in my 71. I removed the s60 rear with 3.73 to use for another project and will be using the 12 bolt the car cane with. Currently has 4:56 gear and a tci super street fighter th400. What gear and converter would you recommend. Ice cream getter with weekend passes on the 1/4. Very little highway driving. Thank you. Also will be testing with a 200 shot of spray in the next few days. Wet on a plate.
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post #2 of 14 (permalink) Old Jul 10th, 19, 6:04 PM
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Ed
 
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Re: Gearing/converter to match engine dyno.

First and foremost you need to get the Strange 60 back. Then talk about gearing and 200 shots of nitrous
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post #3 of 14 (permalink) Old Jul 10th, 19, 8:01 PM Thread Starter
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I would but the s60 is going in a project 68 Camaro I’m building. The engine that’s going in the chevelle is a stock looking matching set. gm block gm heads. Trying to do the sleeper thing. Have gone so far as painting my billet damper and timing cover to try and hide as much as possible. The 12 bolt is factory appearing. So I would like to use that. Based on the dyno sheet would you guys think a 28 tire 4:10 gear and a 2800 converter would be leaving to much on the table? Made several pulls up to 6800 and a few to 7000. Nothing to gain as the hp from 6300-7000 drops of slowly down to 607 at 7000. Engine was designed to make peak power @ 6000 rpm and have capability to rpm some more to dial in shift points and spray. Dyno pulls with 200 spray will be Friday.
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post #4 of 14 (permalink) Old Jul 10th, 19, 8:43 PM
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Gary
 
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Re: Gearing/converter to match engine dyno.

i would use a 373 gear and call hughes at I etc about a convertor. the 248 low gear will work great with a 373
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post #5 of 14 (permalink) Old Jul 10th, 19, 8:58 PM Thread Starter
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Thanks for the reply. Do you think that combo would keep me in my ideal power band based on the dyno sheet? Wish I could find some kind of shift rpm drop calculator.... or I just need more experience setting up big blocks with th400s. Hey all in time. It’s part of the fun.
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post #6 of 14 (permalink) Old Jul 10th, 19, 9:38 PM
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Gary
 
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Re: Gearing/converter to match engine dyno.

yes and definitely better with nitrous. if you allready have the 410 gear try it out 1st then go 373. i bet money you like the 373 better
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post #7 of 14 (permalink) Old Jul 10th, 19, 10:29 PM
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Re: Gearing/converter to match engine dyno.

You really need to decide if you want optimum results NA or on spray. You cant have both without compromises. For NA a 4.10 gear and 28'' tire would work well and is what I use on my car. Peak power at 6000 you would shift 6400-6500 so you would want it to fall back 1000 to 1300 on the shift, so around 5200 stall converter. I would use a custom built 8'' converter that still drives good on the street. If you go nitrous you will need less gear and converter. If you are not concerned with the best ET possible NA you can run a more conservative gear and converter. Depends what your goal is.
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1964 Chevelle 300, all steel, full interior. DOT tires all around, through mufflers. TH400, 12 bolt posi 4.10

Old combo - 454 10-1 , 049 heads home ported 2.19,1.88,DP Intake,1050 4150,Comp XR294HR, 2''x3.5'' headers. 1.43 - 6.82 / 98.98 - 10.77 / 123.83 MPH

New combo - 454 .100 over 13-1, Afr 325, SR cam
1.39 - 9.96 - 134.71 MPH so far.
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post #8 of 14 (permalink) Old Jul 14th, 19, 1:43 PM Thread Starter
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Thanks big block. I have a set of 410 in the shop I think I’ll start with those and see if it’s a good street track compromise. Would be nice to get down to the 355-373 area eventually on the spray. Time will tell. Maybe change tires. Currently running a 28. I’m going to see how the car performs with the 2800 stall I have. Only has a few miles on it. If it’s way off from what I’m hoping for, I’ll reassess and do some more improvements over the winter. Hopefully it won’t be a dog with the 410 2800 stall and a 28 tire. I don’t want to make to many changes to engine as I’m very please for a gm pump gas set up. Just some spray. Maybe.
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post #9 of 14 (permalink) Old Jul 14th, 19, 2:34 PM
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I would go with big blocks advise on the converter or no less than 4500. Especially if your trying to make a sleeper out of the car. Bc on the street it would be less likely to blow the tires off the car bc it wouldn't hit the tires as hard on take off bc of the high stall in the car it would have a little cushion on the tires to let it get rolling out before all the power come in on the motor
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post #10 of 14 (permalink) Old Jul 14th, 19, 3:38 PM Thread Starter
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Would driving a 4500-5500 stall on the street with an estimated Cruz rpm of 2300-3500 smoke that converter and or over head the trans? Never being fully engaged and all? My thinking was to get a converter that will lock up right before peak tq? But based on my dyno sheet it seems the consensus is to go with a high stall... is my thinking flawed to want it to flash before peak so I can use the whole Powerband? I’m open to being educated on this based on my dyno sheet and would very much appreciate the lesson. Thanks guys just trying to be better at this whole total package thing.
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post #11 of 14 (permalink) Old Jul 14th, 19, 4:33 PM
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Vince
 
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Re: Gearing/converter to match engine dyno.

Nice results...what compression, cam and intake are you running?

*69 SS 502 EFI /224-228* HR/9.8:1/T56/3.90/ 4000lbs RW 11.5/124mph
*96 Stang 6.0 turbo 10.5/135mph (9.13 ET w/E85 and 16psi) **SOLD**
*2011 Mustang GT premium
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post #12 of 14 (permalink) Old Jul 14th, 19, 8:46 PM Thread Starter
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Pump fuel 10.4 to 1 I’m running a Vic jr intake with a Straub cam
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post #13 of 14 (permalink) Old Jul 16th, 19, 12:53 PM
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Greg.
 
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Re: Gearing/converter to match engine dyno.

Quote:
Originally Posted by 71malibuu View Post
Would driving a 4500-5500 stall on the street with an estimated Cruz rpm of 2300-3500 smoke that converter and or over head the trans? Never being fully engaged and all? My thinking was to get a converter that will lock up right before peak tq? But based on my dyno sheet it seems the consensus is to go with a high stall... is my thinking flawed to want it to flash before peak so I can use the whole Powerband? Iím open to being educated on this based on my dyno sheet and would very much appreciate the lesson. Thanks guys just trying to be better at this whole total package thing.
I had a stock Stall converter in a Stock 400 Trans in 2009 in my 67
on recommendation from my old Speed Shop/SemiPro Racers they installed a 3,500+ Stall Converter
I told them it was running to Hot, even with a Trans Cooler & that on Hwy it was slipping/then engaging
less than a year later I had a Burnt up 400 which got Rebuilt for Free and a 2,400-2,600 Stall Converter put in

This Spring 2019 I had the 400 (9+ yr old Rebuilt) pulled and Rebuilt with a Reverse Manual VB
and a 3,500-6,500 Stall Converter installed along with a new B&M Pro Ratchet Shifter

So far she seems to Stall at 5,000 RPM, but have so far had no problems with Slippage on the Street

When I ordered the Higher Stall Converter this Spring I sent all the needed Specs
for the Cam/Carb size/Header size/Rearend Gear Ratio/Tire size/Weight of Car, to the Converter Company
along with how I drive the car, Street/Hwy and Weekends at the Track,
which is very important that they know if you want a Loose or Tight Converter

Based on my Specs etc. the Company recommended the following Converter which I ordered
9.5" Race/Street - Features - Dual anti-ballooning plates (where applicable), triple bearing package, full furnace brazing,
all fins are hand welded for extra reinforcement, bulletproof sprag and stator design
great for bracket cars or serious street cars. Super efficient.
Dynamic Converters / Pro-Formance Transmissions

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #14 of 14 (permalink) Old Jul 16th, 19, 5:24 PM Thread Starter
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Kirk I just got off the phone with your torque converter guys. Great deal on a 91/2 street/race converter. Calling him back in the am when we find out exactly how much Spray we are going to run. Any one know what it would take hp wise to get to 10.00 in a street car/tire 275, 71? Dyno sheet above. Would only like to spray it as much as I have to and no more. This is my first street nitrous car. Thanks for all the help guys.
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