Which is it, 13pct or 15pct??
Thread Starter
Burning Brakes
Joined: Jan 2004
Posts: 1,243
Likes: 6
From: Rowlett Texas
Which is it, 13pct or 15pct??
I have believed ever since getting my 6spd C5 that the drive train power loss was 15 percent. Recently some friends have told me that it's 13 percent. While I'm sure the number is fairly fluid, what would be most accurate?
Thanks,
Thanks,
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
I see many folks on here speaking about a 15% powertrain loss, but two different tuners told me its a conservative 12%.
I'm curious to find out the true percentage, from someone that is considered an authority on the topic....and not a few guys trying to convince themselves they have more power than they do.
I'm curious to find out the true percentage, from someone that is considered an authority on the topic....and not a few guys trying to convince themselves they have more power than they do.
Thread Starter
Burning Brakes
Joined: Jan 2004
Posts: 1,243
Likes: 6
From: Rowlett Texas
I see many folks on here speaking about a 15% powertrain loss, but two different tuners told me its a conservative 12%.
I'm curious to find out the true percentage, from someone that is considered an authority on the topic....and not a few guys trying to convince themselves they have more power than they do.
I'm curious to find out the true percentage, from someone that is considered an authority on the topic....and not a few guys trying to convince themselves they have more power than they do.
Shoot, now I'm getting disappointed.
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
Its not necessarily a set amount. It can be different based on wheels, brakes, shafts, fluids, etc.
And, to complicate it even more, its probably not even a percentage.
A 6 speed may take as little as 12 percent to turn behind a 400 hp motor, but I have a hard time believing it would take 120 hp to turn behind a 1000 hp engine.
Thats using an extreme, but you get the idea. Alot of experienced guys are of the belief that they take a certain percentage up to a point.
And, to complicate it even more, its probably not even a percentage.
A 6 speed may take as little as 12 percent to turn behind a 400 hp motor, but I have a hard time believing it would take 120 hp to turn behind a 1000 hp engine.
Thats using an extreme, but you get the idea. Alot of experienced guys are of the belief that they take a certain percentage up to a point.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
I see many folks on here speaking about a 15% powertrain loss, but two different tuners told me its a conservative 12%.
I'm curious to find out the true percentage, from someone that is considered an authority on the topic....and not a few guys trying to convince themselves they have more power than they do.
I'm curious to find out the true percentage, from someone that is considered an authority on the topic....and not a few guys trying to convince themselves they have more power than they do.
Go figure
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
But the Mustangs have operator entered correction factors which leave them open for inaccurate or tampered results. You can actually make them read higher (than a dynojet), which has been the topic of some pretty heated debates on ls1tech.
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Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
: 
: 
Very heated. 
so the end result and many ppls opinions, a DYNO is a tuning Device only, nothing more.
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
for a stock C5, I've always heard 15% for manual tranny, and 17% for automatic. I dont' remember where those figures came from - or their validity... but that's what I've always read.
Besides, drive-on car dynos are not intended to spec an engine... they're used to verify before/after mod gains.
ain't that teh truth
Besides, drive-on car dynos are not intended to spec an engine... they're used to verify before/after mod gains.
ain't that teh truth
Last edited by Mike Mercury; Aug 13, 2007 at 11:13 AM.
Thread Starter
Burning Brakes
Joined: Jan 2004
Posts: 1,243
Likes: 6
From: Rowlett Texas
The numbers are 345 RWHP and 353 RWTQ rounded up (of course) to the nearest whole number.
BTW, I'll respond to your email with some other ideas and thoughts.
Melting Slicks
Joined: May 2000
Posts: 2,498
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From: Brentwood TN
Drifting
Joined: Mar 2005
Posts: 1,737
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From: Northern VA