How much rwhp does have if it is running 103mph?


LT1 Coupe,hard top A/4

Estimate

 

I'd say around 260-270. What are your modifications?

 

Depends on what rpm it is at, and modifications. I'd say around 250-260 is good though (since auto).

 

It depends on the weight of the car and the diameter of the tire. Was that on street tires or slicks? If it is on street tires, and the car weighs about 3500 with you, I'd say 260. 3600 lbs, 270, and 3800 lbs 280 rwhp. If that was on slicks, I'd say add anywhere from 25 - 30 rwhp. Then again, if you dyno on slicks, that would probably be accurate to a better degree. What mods does the car have? That and the weight would be a much better judge of hp, next to a dyno. With the calculator I have, I am rarely more than 5 hp off. Go get some dyno numbers so I can verify!

 

ok is A4 on 16'' rims and street tires

I have long tubes, cai, and only muffler(ultra flow 2.5 inlet), stock tips 2.25 outlet
stock exhaust, 160 thermostat, fans temp programed

 

Do you have the race weight??

 

no

I haven't took anything off yet

leather, all that stuff

 

I think you guys are lowballing him bigtime. I used to trap mid to high 102 consitently at ~1500-2000 DA. That was back when i had 277rwhp in an M6. Sample time 1.95 60' 13.464@102.61 Check my sig for exact mods at the time.

He has an A4 so he should be somewhat higher, not to mention longtubes Once i did exhaust i trapped 106mph. So depending on his altitude i'd put him at 285rwhp.

Why don't you go dyno your car?

 

Well, if an A4 and M6 run the same trap speeds/dyno the same, the A4 will be more powerful at the flywheel but RWHP will be the same...

 

Very very true, I was

kinda.

I think an auto will still trap OH SO SLIGHTLY slower than a manual with the same peak rwHP. They go through a larger rpm range on the downshift which will lower their area under the curve, but their curves are different shaped anyways so maybe i'm completely wrong on that.

However the point remains that
1st off, he trapped higher than me so i gave him a few guestimated HP over me.
2nd off, I was also (possibly incorrectly) assuming that he was at higher elevation than i was since most of the country is. That will show up in lower traps but no SAE rwHP #s.

Blah blah blah we still don't know his weight, blah blah blah,
I'm rambling about NOTHING again and should have kept my mouth shut....

Lets just say he has the exact same rwHP as i did and we'll split the difference, my 285 guess was 8 off and yours 7 off madwolf, cheers to you

 

Very good points!

I don't have much experience with various altitudes but I would think the RWHP should stay the same regardless of the altitude. No?

 

It's not really the altitude at all. It's actually the trend that higher altitudes typically (on average) have lower barometric pressures.

Since Barometric pressure IS taken into account in the SAE and STD corrections, someone in lets say denver will put down the same RWHP but trap mucho slower than someone around sealevel.

 

Right, I knew about the ETs being lower at higher altitudes but didn't think the RWHP would be different too. I guess I was wrong.

According to SAE J1349 (correction factors) the density of the air (and not only that... temperature, etc) influences horsepower. (DUH!)

Some interesting info here.

 

This is also an interesting link which i found after i got duped by the ford dyno shop i went to. It indicates that just SAE alone implies 'SAE Jxxx' and STD implies 'SAE STD'. Both corrections established by the SAE though. I wonder if absolutely everyones 'SAE' numbers are really the J correction and not 'SAE STD'. I smell a conspiracy!!!