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#2458903 - 02/28/18 11:55 AM What clutch would be best for street and track use?
chargervert Offline
master

Registered: 09/18/04
Posts: 8543
Loc: RI Deep in the rust belt
I just bought a new project car,and I am trying to decide which clutch kit would be best for street and occasional auto cross and circle track,or road course use. The car is a 70 Charger body on a modern Loughlin style Nascar chassis, with a Daytona aero kit on it. The car will be powered by a 472 Hemi with approximately 750 horsepower and a Tremic 5 speed, with a full floating 9 inch rear axle. The Tremic transmission has a Lakewood blowshield with the block protector plate and Kieslers hydraulic clutch throw out bearing kit. Any help with selecting the correct clutch kit would be greatly appreciated. Thanks Pete.


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70 Charger R/T SE 472 Hemi 70 Charger R/T convertible 70 Charger R/T V Code Sixpack 69 Charger R/T SE Sunroofcar 68 Charger 383 68 Charger 318 71 Charger R/T 70 Challenger convertible 71 Challenger convertible 71 Cuda 340 09 Challenger R/T Classic

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#2459251 - 03/01/18 01:28 AM Re: What clutch would be best for street and track use? [Re: chargervert]
68rrunner Offline
member

Registered: 02/06/10
Posts: 148
Loc: Mountain View, CA
The Tremec 5 speed probably won't survive. The upper limit of the TKO's (IMO) is 400rwhp/400rwtq. anything north of that and you should probably look into a T56 or a Legend.
To answer your question, Centerforce probably makes the best stuff for a street car and their stuff can get pretty racey. Give them a call and they can custom build the whole unit to your specs and driving style.

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#2459300 - 03/01/18 07:52 AM Re: What clutch would be best for street and track use? [Re: chargervert]
Uhcoog1 Offline
super stock

Registered: 05/12/05
Posts: 720
Loc: Houston Tx
Pete-

How much did you have to pay for that thing?

I think there are better transmissions available for your build. But if you must stick with the tko, call pro motion powertrain in Florida. They've built tko's that stand up to 800+ hp, sell a 'brace' for the case (which cracks in high torque applications), and will spec a clutch to reduce the shock the trans experiences which in turn will help the transmission last as long as possible.
_________________________
-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course

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#2459365 - 03/01/18 10:12 AM Re: What clutch would be best for street and track use? [Re: Uhcoog1]
chargervert Offline
master

Registered: 09/18/04
Posts: 8543
Loc: RI Deep in the rust belt
I bought this car from a Moparts member who just wanted out of the project. He was really beyond fair with me on it. I would say that I paid about a quarter of what is invested in it. The Tremic TKO came with the car. I will look into Pro Motion Powertrain. Thanks for the information. I may end up using the TKO in my other 70 Charger R/T that will have a more street friendly Hemi in it.
_________________________
70 Charger R/T SE 472 Hemi 70 Charger R/T convertible 70 Charger R/T V Code Sixpack 69 Charger R/T SE Sunroofcar 68 Charger 383 68 Charger 318 71 Charger R/T 70 Challenger convertible 71 Challenger convertible 71 Cuda 340 09 Challenger R/T Classic

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#2469682 - 03/21/18 11:24 AM Re: What clutch would be best for street and track use? [Re: chargervert]
thewolf1970 Offline
member

Registered: 03/14/18
Posts: 7
Loc: texas
Few more options would be Jerico or Gforce and mcleod for your clutch set up. I would get maybe a street twin or a rag style clutch you can adjust the pressure on when street driving and then a race set up easy adjustment.


Edited by thewolf1970 (03/21/18 11:25 AM)

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#2490064 - 04/30/18 03:26 PM Re: What clutch would be best for street and track use? [Re: thewolf1970]
dogdays Offline
I Live Here

Registered: 01/20/03
Posts: 16088
Once again I read about transmissions being "rated" for horsepower. That is meaningless. The only limitations on horsepower would be when the frictional losses in the tranny got so large that the transmission overheated.

The transmission is affected by TORQUE. Torque is what twists the shafts and puts pressure on the gear teeth making them want to slide apart or break off.

I believe that the hp "rating" is the manufacturer assuming a generic street rodded engine and estimating the hp and torque.
the manufacturer assumes that torque and horsepower will maintain the same ratio over the rpm curve. Say the factor used by the manufacturers is 1.2 lb-ft per 1 horsepower. I'd like to think that gearbox designers designed to a target torque for a particular box. So say the transmission is designed and tested for max torque of 600 lb-ft of torque. The manufacturer then applies the fudge factor and sees that 600 lb-ft "converts" to 500hp. Advertising geeks put it in print and there you have it. The transmission is good for 500hp.

Never mind that the transmission is mated to a 500hp Diesel engine running turbos and that engine puts out 450 lb-ft at idle and maxes out at 1100 lb-ft at 2400 rpm. The transmission never saw more than 500hp yet it is in pieces on the track.

R.

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#2490280 - 05/01/18 04:18 AM Re: What clutch would be best for street and track use? [Re: dogdays]
ahy Offline
master

Registered: 01/22/07
Posts: 7562
Loc: IN
To hold with reasonable pedal effort agree something like a Centerforce. I would suggest call Silver Sport who bought Keisler. They have a twin disc clutch they recommend for high HP/torque applications.

I run a Keisler behind a warm BB stroker. The highest rated version (600 ft lb torque rating I believe). It has done OK even though my engine made 687 ft lb on a dyno after freshen and tuneup. With this transmission shifting as you approach and exceed 6,000 RPM can be tough.

I think it is worth getting the right clutch and give it a try. Later on you can upgrade to a Viper based 6 speed if you want.

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#2509456 - 06/16/18 08:42 PM Re: What clutch would be best for street and track use? [Re: chargervert]
mopardude318 Offline
enthusiast

Registered: 12/05/09
Posts: 211
Loc: Gilroy,CA.
what about maybe a Passon A855?
_________________________
408 Stroker 533 HP 520 FT LBS...........................1970 Dart RMS AlterKation

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