Not to argue but its probably a little more than 12 but less than 17.
Determining RWHP
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Melting Slicks
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Determining RWHP
Baseline: LS1-326 rwhp on a dyno. This, before heads and cam. I assume that heads and cam should produce 75 hp. Is that at flywheel or the rw's?If at flywheel that represents a 60 rwhp increase or 386 rwhp or about 480 hp at the flywheel. If the 75 hp is net to the rear wheels then I would be about 500 hp at the flywheel. Let me know your thoughts.
Drifting
Joined: Dec 2003
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From: Upstate NY
The HP gains are usually in terms of rwhp. That being said, I would be disappointed if I spent the money on a H/C package and only got 75 rwhp. I would expect a minimum of 100, and of course that's after all the anciallry bolt ons are done (headers/intake etc.).
Additionally, the driveline loss of hp is usually about 17% for an MN6. More for an auto. So 380 rwhp equates to, roughly, 460 crank hp.
Additionally, the driveline loss of hp is usually about 17% for an MN6. More for an auto. So 380 rwhp equates to, roughly, 460 crank hp.
Le Mans Master
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Burning Brakes
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Le Mans Master
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St. Jude Donor '13-'14-'15
AFR heads report in articles to make 40 RWHP on their 205's----If you do the math on my set-up my stock LS6 mild ported heads only made 17 RWHP---all the usual bolt-ons too LT's etc------
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Melting Slicks
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Former Vendor
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St. Jude Donor '07-'08-'09-'10-'11-'12'-'13-'14-'15
Now on to H/C packages. On my A4 2000 I had a 228 .581 114 LSA XER cam only with all bolt ons and made 375HP/401TQ. With my M6 car with AFR 205 milled to 59cc and 228/232 .585/.591 114LSA XER with all bolt ons I should see about 440HP/400TQ.
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Former Vendor
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St. Jude Donor '07-'08-'09-'10-'11-'12'-'13-'14-'15
Le Mans Master
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He is wrong. The A4 is in the 15% area and M6 is 12%. This has been proven by many, many baseline dynos showing 345 HP 97-00 A4 cars at 295-305HP and M6 at 300-315. There are some that are a little lower or a little higher on a dynojet but they are the exception rather than the norm. 20% loss on an A4 would mean you lose 70HP on a 350HP car. No way
Maybe the tuner was refering to a mustang dyno instaed of a dynojet???
Burning Brakes
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From: Wayne NJ
A 350hp at the crank reguires about 45 hp to power the driveline and you end up with 305RWHP. Im thinkig that a 505HP engine still requires that same amount of hp to power the driveline and you end up with about 460RWHP. So you do some mods on your car and end up with a dyno rwhp figure of 335. So how can you figure what your crank hp is now? Am I a nut and just have too much time on my hands? The cold weather is setting in now in the N.E. It doesnt look like i will be driving the Vette for the next 5 months or so.
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St. Jude Donor '07-'08-'09-'10-'11-'12'-'13-'14-'15
Pro
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A 350hp at the crank reguires about 45 hp to power the driveline and you end up with 305RWHP. Im thinkig that a 505HP engine still requires that same amount of hp to power the driveline and you end up with about 460RWHP. So you do some mods on your car and end up with a dyno rwhp figure of 335. So how can you figure what your crank hp is now? Am I a nut and just have too much time on my hands? The cold weather is setting in now in the N.E. It doesnt look like i will be driving the Vette for the next 5 months or so.
Race Director
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From: Haymarket VA
Hell, make up a number. It will have as much basis as this excersize. The OP started with made up numbers and is trying to extrapolize from those. I'm not being critical. If the question was how much loss between an engine dyno and a chassis dyno that's another question. Most people will use 15% for an M6 and 18-20% for an A4.
Melting Slicks
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Le Mans Master
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St. Jude Donor '13-'14-'15
He is wrong. The A4 is in the 15% area and M6 is 12%. This has been proven by many, many baseline dynos showing 345 HP 97-00 A4 cars at 295-305HP and M6 at 300-315. There are some that are a little lower or a little higher on a dynojet but they are the exception rather than the norm. 20% loss on an A4 would mean you lose 70HP on a 350HP car. No way
Now on to H/C packages. On my A4 2000 I had a 228 .581 114 LSA XER cam only with all bolt ons and made 375HP/401TQ. With my M6 car with AFR 205 milled to 59cc and 228/232 .585/.591 114LSA XER with all bolt ons I should see about 440HP/400TQ.
Now on to H/C packages. On my A4 2000 I had a 228 .581 114 LSA XER cam only with all bolt ons and made 375HP/401TQ. With my M6 car with AFR 205 milled to 59cc and 228/232 .585/.591 114LSA XER with all bolt ons I should see about 440HP/400TQ.
20% seems to be more accurate as far as i've seen--(350-70=280)
If you use this as a basis then all the mods I listed above make sense to me-- I have NEVER seen a stock A4 corvette make 300 RWHP--and that is what they would be making if the powertrain loss was 15%
Burning Brakes
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From: Oregon City , Oregon USA
Wouldn't the percentage of loss in the drivetrain depend a lot on the power being applied. The more power applied the greater the percentage of loss? A good deal of the loss is due to the gear teeth rubbing against each other as they turn. That's why straight cut gears transmit more power than helical cut ones. I would think that since it's frictional losses, the more power applied, the more loss, as a percentage, you'll have.
Melting Slicks
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12,5% in the case of my ZO6, 575 FHP and 511 RWHP.
Christian
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Melting Slicks
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Hell, make up a number. It will have as much basis as this excersize. The OP started with made up numbers and is trying to extrapolize from those. I'm not being critical. If the question was how much loss between an engine dyno and a chassis dyno that's another question. Most people will use 15% for an M6 and 18-20% for an A4.