Southern Softies - Southways Automotive 14 Dec 2013 PICS

[charlie-r]

Just a thought and I hope someone corrects me if I'm wrong but....

I've never done a dyno day before, and I noticed the guy corrected all our figures off ambient air pressure which went into the air filter, but I thought in a turbocharged car you wouldn't be able to correct it because that ambient temp is then heated up during compression in the turbo to x degrees and then cooled via the intercooler to another temp. Just done a quick bit of reading and apparently you can't sae correct turbo engines? So we should be gloating about our non corrected numbers instead?

[charlie-r]

In an na car the temp/pressure of the air in controlled by your conditions, but in a turbo the pressure is controlled by your wastegate? I'm sure I've got something wrong but it's something to mull over

[jamesy12345]

In an na car the temp/pressure of the air in controlled by your conditions, but in a turbo the pressure is controlled by your wastegate? I'm sure I've got something wrong but it's something to mull over

A bit of light reading on that here......

http://forums.nasioc.com/forums/showthread.php?t=873912

[charlie-r]

Yeeeaahhh 283.7bhp bragging rights!

[oblark]

Very happy with this

[smithy]

What was it at the fly? You can't compare whp dyno to dyno, as they all measure different.

I'm not going argue but you cannot compare crank bhp because the drag loss on different rollers is not comparable .the is a article about rollers some where .saying that whp is the most accurate reading .

[JUDGENINJA]

Very nice...

[S70T5Chris]

I'm not going argue but you cannot compare crank bhp because the drag loss on different rollers is not comparable .the is a article about rollers some where .saying that whp is the most accurate reading .

You are going to argue, you always argue your point! Even though it's invalid.

[merc85]

Well done Rob, Glad to see all those mods paying off And also well done to MRP wicked whp mate

[smithy]

You are going to argue, you always argue your point! Even though it's invalid.

Me I never argue but have a good debat lol

[LiamT4]

I'm not going argue but you cannot compare crank bhp because the drag loss on different rollers is not comparable .the is a article about rollers some where .saying that whp is the most accurate reading .

People just ignore that article smithy. The fact is if a dyno can't get reliable whp figures then it has f*ck all chance of getting the crank figure correct. A dyno is connected to the car by the wheels, so it measures power at the wheels, how the numbers are then corrected is down to many things. Most dynos I've been to (and I used to go to a lot) would show similar whp AND bhp for the same car (on different dynos), only varying by a few %, which could be down to many things. Theres only been one exception to this rule, where the whp has been way off, but the bhp still seemed to be reasonably accurate for the cars.

[S70T5Chris]

People just ignore that article smithy. The fact is if a dyno can't get reliable whp figures then it has f*ck all chance of getting the crank figure correct. A dyno is connected to the car by the wheels, so it measures power at the wheels, how the numbers are then corrected is down to many things. Most dynos I've been to (and I used to go to a lot) would show similar whp AND bhp for the same car (on different dynos), only varying by a few %, which could be down to many things. Theres only been one exception to this rule, where the whp has been way off, but the bhp still seemed to be reasonably accurate for the cars.

I haven't been on many different manufacturer dyno's. But the best examples I can think of, from my own car - was my T4 ran on a maha, and was 'x'whp (I can't remember the exact figures), and was 222bhp at the fly. 2 weeks later I ran on a Mustang dyno, the flywheel horse power was 221bhp, but the whp was much higher than the maha whp.

If you lined up the same car on ten different manufacturer dynos, I bet the BHP result would be more consistent than the WHP results. You can't compare whp results dyno to dyno, they vary so much.

Already rolling, a 300bhp Scooby will be as fast as a 300bhp V70 all day long, there'll be nothing in it. But your fwd V70 will be (for arguments sake) 270whp, and the 4wd Scooby will be 230whp. You reckon the Scooby will be slower? NO! WHP is something that Americans (and Smithy) are obsessed with! And it's wrong to think that it tells the true picture of a cars performance.

Just look at these results from today. Rob's car is 310bhp at the fly, and 300whp?? Come on. And Judge's T4 is 260whp(????), yet 259 at the fly!! I fully believe the flywheel results from today, they seem very sensible, and what you'd expect, but the whp is a perfect example that defunks the argument that whp is the most accurate reading in the real world. The whp results are only valid for the dyno that it is run on, and nothing else.

[smithy]

I haven't been on many different manufacturer dyno's. But the best examples I can think of, from my own car - was my T4 ran on a maha, and was 'x'whp (I can't remember the exact figures), and was 222bhp at the fly. 2 weeks later I ran on a Mustang dyno, the flywheel horse power was 221bhp, but the whp was much higher than the maha whp.

If you lined up the same car on ten different manufacturer dynos, I bet the BHP result would be more consistent than the WHP results. You can't compare whp results dyno to dyno, they vary so much.

Already rolling, a 300bhp Scooby will be as fast as a 300bhp V70 all day long, there'll be nothing in it. But your fwd V70 will be (for arguments sake) 270whp, and the 4wd Scooby will be 230whp. You reckon the Scooby will be slower? NO! WHP is something that Americans (and Smithy) are obsessed with! And it's wrong to think that it tells the true picture of a cars performance.

Just look at these results from today. Rob's car is 310bhp at the fly, and 300whp?? Come on. And Judge's T4 is 260whp(????), yet 259 at the fly!! I fully believe the flywheel results from today, they seem very sensible, and what you'd expect, but the whp is a perfect example that defunks the argument that whp is the most accurate reading in the real world. The whp results are only valid for the dyno that it is run on, and nothing else.

Judge t4 didnot get 260whp it was at the crank thankyou and goodnight lol

[S70T5Chris]

Judge t4 didnot get 260whp it was at the crank thankyou and goodnight lol

Look again - Wheel power (measured) - 260.5hp

I tell you now, the only reason that company installed that dyno, is because it gives the highest whp readings known to man!

[T5frankie]

what is this corrected power thing?

[T5frankie]

i agree with chris something not quite right with those figures

[S70T5Chris]

what is this corrected power thing?

A few dynos I've seen give a measured and correct flywheel hp, the Maha does. It's the corrected hp result that counts. Sometimes it works the other way, and the corrected is higher than the measured IIRC.

[S70T5Chris]

i agree with chris something not quite right with those figures

[T5frankie]

A few dynos I've seen give a measured and correct flywheel hp, the Maha does. It's the corrected hp result that counts. Sometimes it works the other way, and the corrected is higher than the measured IIRC.

so is robs 324bhp or 310bhp? as he has put on the rolling road table 324bhp

[S70T5Chris]

so is robs 324bhp or 310bhp? as he has put on the rolling road table 324bhp

310bhp