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Author
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Topic: hp loss....
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Dubz
Gearhead Posts: 1781
From: Manitoba Canada
Registered: Oct 2002
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posted 04-08-2003 03:46 AM
   
Approx how much hp loss should i be looking at with my c6 with a B&M transpak shift kit? 25% or less?If i am making 400 fwhp (some people say the loss is logarithmic) or is it like some people think is a set value no matter what hp you are making (according to a couple pages stock c6 take 50-60hp) [This message has been edited by Dubz (edited 04-08-2003).]
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Hans olsson
Gearhead Posts: 670
From: Sweden
Registered: Apr 2000
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posted 04-08-2003 02:44 PM
The only thing i know for sure is that when our motor made 412 Hp we made 360 Rwhp according to computer based drag strip dynos.
??? 360/412=0.87 for a total loss of 13 percent. 412-360= 52hp loss
This was with a C-4.
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- 71 Mach1 351c
- E/SA 11.89-110 mph
- F/SA 11.76-111 mph
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Dubz
Gearhead Posts: 1781
From: Manitoba Canada
Registered: Oct 2002
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posted 04-08-2003 04:29 PM
with an aluminum drive shaft that should be less as well correct?? assuming the lesser rotational weight will take less torque to spin
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Ryan Wilke
Gearhead Posts: 2125
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 04-08-2003 04:57 PM
It's my understanding that a 'good' C-4 can take 400-500HP and it uses less HP than a similar-built C-6. So - IF you've got the $$$, a C-4 can be built to take it, is lighter & 'uses' less HP. Remember: It's just MONEY!!
-- something I could use more of!  Ryan 
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Dad Vishus
Gearhead Posts: 856
From: Moscow, Iowa, USA
Registered: Dec 2001
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posted 04-08-2003 05:16 PM
quote:
Originally posted by Ryan Wilke:
It's my understanding that a 'good' C-4 can take 400-500HP and it uses less HP than a similar-built C-6. So - IF you've got the $$$, a C-4 can be built to take it, is lighter & 'uses' less HP. Remember: It's just MONEY!!
-- something I could use more of! Ryan
KVs car weighs about 2800 with him in it and runs 6.20s in the 1/8 mile. I don't know the exact math formula but if that isn't over 600 HP, I'm greatly surprised.  His C4, which was origianlly prepped by Trans-King, has gone over 400 passes without being touched and with no problems. We had Bruce Micetich of Advance Transmission in Knoxville Iowa freshen it a couple of times and he always complained about the high internal pressure, but didn't change it and it has been very reliable. As I recall, KV bought that trans. about 6 or 7 years ago and paid $1100 for it. We ran a C6 before that and when we changed over, all incrementals improved greatly. He has since rollerized it which it wasn't originally. A properly prepped C4 will stand alot of horsepower and abuse. I beleive the figures I heard for HP consumption were 60 for the C6 and 35 for the C4. I could be wrong.  ------------------
63 Falcon 377 Cleveland stroker Flying Toilet alchohol injection. 6.19 @ 110 MPH 1/8 mile
2002 Ranger FX4 daily driver
2000 F350 PSD Crew cab dually - Like commuting in a B52!!
98 US Cargo Phantom II 28'
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Ryan Wilke
Gearhead Posts: 2125
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 04-08-2003 05:25 PM
DV:
I'd call KV's Trans King prepped, rollerized C-4 a "BETTER" C-4; which is much better than a 'good' C-4. I was thinking of a solid, OEM C-4 slushbox with a bolt-in kit..... I'd also guess that a top-shelf C-4 from JPT would also take a bunch more than 500HP! Ryan
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