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C4 Trans

 
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kurt02gt
Newbie


Joined: 09 Jul 2007
Posts: 12
Location: Broadview Hts, Ohio
497.68 points


2002 Ford Mustang

PostPosted: Thu Jul 19, 2007 11:09 am    Post subject: C4 Trans Reply with quote

My stock 4R70W finally took a crap on me. I'm really considering switching over to a C4 since it is a track hoe. The 4R70W parts are very high and it is just cheaper to do the switch.

My question is how much upgrading do I need to do to have a C4 support NA 300-320rwhp? What do I need to upgrade that will help reduce hp loss through this trans?

Thanks

_________________
2002 Mustang GT
Best ET: 11.90@113MPH
Best 60ft: 1.58

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Paul P
Member


Joined: 15 Aug 2002
Posts: 2449
Location: Townsend, Mass.
83052.36 points


1971 Chevrolet Chevelle

PostPosted: Thu Jul 19, 2007 12:11 pm    Post subject: Reply with quote

Looks like the C4 can take quite a lot if built right. Here is a link to some part that I found. They have a tech line I would give them a call.

http://www.broaderperformance.com/c4_transmission_parts.htm

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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William Jones
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Joined: 30 Jan 2006
Posts: 826
Location: Lake city, FL
28640.90 points


1971 Ford Mustang

PostPosted: Thu Jul 19, 2007 10:34 pm    Post subject: Reply with quote

At that horse power rating the C-4 will handle the abuse. I run C-4's and when I changed from the C-6 to the C-4 I picked up 4 tenths avg on my E.t. The weakest link is the input shaft but you can buy hardened shafts. They make rollerized trannys but I haven't seen much of a horsepower loss difference between the roller and non rollerized C-4's. I was able to do a comparison of a rollerized BTE C-4 and a Godley nonroller C-4 in my car and I saw no real difference except that my C-4 shifted harder. I got my tranny's from www.godleytrans.com you can get one without the brake for $695,$895 with. I have been running 10's with these tranny's and haven't broke a single time but did blow a pump seal once, I added hardened input shafts also. He will also refresh one of his tranny's for $365 I think. He doesn't offer rollerized C-4's if that is what your looking for what ever you do don't buy BTE or TCI C-4's the experiences I have had with them have been bad.
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Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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wagon train
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Joined: 07 Jun 2007
Posts: 258
Location: Orange City, FL
7307.16 points


1983 Mercury Capri

PostPosted: Fri Jul 20, 2007 1:19 am    Post subject: Reply with quote

Roller torington bearings also make less heat.
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kurt02gt
Newbie


Joined: 09 Jul 2007
Posts: 12
Location: Broadview Hts, Ohio
497.68 points


2002 Ford Mustang

PostPosted: Tue Jul 24, 2007 10:08 am    Post subject: Reply with quote

thanks for the input. One more question, would I benefit more going with a wide ration plantary gear set to help get the low TQ motor out of the hole.
_________________
2002 Mustang GT
Best ET: 11.90@113MPH
Best 60ft: 1.58

C4 Swap Complete New Times Coming Soon!
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Big Dave
Moderator


Joined: 04 Dec 2005
Posts: 2662
Location: Tampa Florida
120504.72 points



PostPosted: Tue Jul 24, 2007 11:30 am    Post subject: Reply with quote

By changing the gear ratios you can optimize for your power curve (peak torque to peak horse power). Question is do you know what it is (has it been on a dyno)? If not you can guestimate with a desktop dyno, but be advised they are very generous with their numbers (they assume every component is optimized and works with every other component). So you can look at the desktop dyno results and pick a gear that will give you the best launch and drop the fewest RPM between gears. (this is were the track simulation software really shines).

If you pay to access the calculators on this board you can play "what if" with the gear selector calculators and look at how changing the rear gear effects your run with a set power level. Same for the transmission gears (changing one aspect at a time).

Even the best race car is a compromise, as we are restricted by our initial choice of gears, cams, and heads that can not be changed as we go down the track (at least not with our current technology).


Big Dave
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kurt02gt
Newbie


Joined: 09 Jul 2007
Posts: 12
Location: Broadview Hts, Ohio
497.68 points


2002 Ford Mustang

PostPosted: Tue Jul 24, 2007 12:31 pm    Post subject: Reply with quote

yes I have dyno numbers, actually my car is sponsored by the dyno shop.

Peak RWHP: 291@6200rpm
Peak TQ: 320@4200rpm

Right now on my 4R70W trans I drop 2000rpm between shifts but I lockup the converter in 2nd & 3rd gear.

_________________
2002 Mustang GT
Best ET: 11.90@113MPH
Best 60ft: 1.58

C4 Swap Complete New Times Coming Soon!
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