392rwkw's

[Blown BA]

After reading all this page you guys have confused me :lol: l going to have my pineapple juice

[Miyagi]

twas still a monster of a car, no matter how u look at it!

[macka'sxr6t]

I don't want to start a fight,

Everyone who was there seen how Craigs car tried to launch itself of the dyno.

even after checking everything and strapping it down again the car tried to do it again.

No dis-respect to Dean he has an awesome machine. His car even though producing the same approximate power and times to Craigs did not do anything as far as lift off on the dyno in that manner or to me sound as strong. It was obvious to everyone who seen it that Craigs was making heaps more power in those two runs for what ever reason.

I cannot explain it but we all know what we saw, Nick is still cleaning up the from the people standing on the side of the car when it started to head towards them. :lol: funniest thing I've seen in a long time. They were like rats jumping of the Titanic.

Craig if your car has the internals and the abiltiy to make 400 rwkw. You owe it to yourself to make it happen, now that you've had a taste of that feeling of nearly reaching the magic 400 rwkw.

I'm as confused as the next guy but it looked impressive anyway.

macka

[aps]

Fiction

This is a great example of why it's important to back up dyno numbers with 1/4 mile times. The times and mph that my car and Deans car are getting mean the cars have very similar power. I think that for peace of mind a few good 1/4 mile runs will tell you what sort of power you have. Traction isn't real important as the mph will tell the story.

Geea.

<{POST_SNAPBACK}>

Craig I believe you will find that the retarder was hot and not able to hold and measure the power correctly..............this was a common occurance in the old days when the smaller retarders got very hot the power figures just kept on getting bigger as the retarder got hotter.

As you correctly stated the mph shows the real power and I believe that the HPF dyno is measuring your power level very accurately, APS measured Deans car at around 334 RWkW's and his and your mph are very close............in other words 2 + 2 = 4.

No doubt Nick has some problem with his Dyno (sorry Nick no offence intended) maybe you should look into watercooling the retarder, this is what APS did to handle very big grunter engines and to achieve repeatable power readings, dyno run after dyno run.

With water cooling on the large retarder you can run big grunter engines (500+ rwkw) for long periods of time without any sign of retarder fade.

Bottom line Geea the mph you run is proof of the power your car produces, if you know the weight of your car and the mph you've run over the 1/4 mile then basic math will show you the real power of the engine within 5 horsepower or so.

Peter

APS

[Guest]

stay away from the keyboard for a day and walla look at the posts

graig can you pls post the hpf sheet so I can try to find reason?

I am lost as even macca just said I had to restrap in a diferent manner for traction!

sorry guys for the skid marks?

dyno was calibrated 5 weeks ago for autosalon and we keep getting complaints of to low this is definatly the first to high?

what gear did they run it in?

what ramp rate?

how did they strap it?

did they use shoot6?

im stumped these are the only thing that I can think of?

through analysis of data in the first 3 cars run pretzel had set ramp rates to 100 and from miss ally's on it was set to 80 thus explaining some or most of deano's?

what can I say Geea but get that pineapple juice out come around and lets try replicate? I already offered it bring ian or whoever infact anyone from here welcome 2!!!

[Guest]

Fiction

This is a great example of why it's important to back up dyno numbers with 1/4 mile times. The times and mph that my car and Deans car are getting mean the cars have very similar power. I think that for peace of mind a few good 1/4 mile runs will tell you what sort of power you have. Traction isn't real important as the mph will tell the story.

Geea.

<{POST_SNAPBACK}>

Craig I believe you will find that the retarder was hot and not able to hold and measure the power correctly..............this was a common occurance in the old days when the smaller retarders got very hot the power figures just kept on getting bigger as the retarder got hotter.

As you correctly stated the mph shows the real power and I believe that the HPF dyno is measuring your power level very accurately, APS measured Deans car at around 334 RWkW's and his and your mph are very close............in other words 2 + 2 = 4.

No doubt Nick has some problem with his Dyno (sorry Nick no offence intended) maybe you should look into watercooling the retarder, this is what APS did to handle very big grunter engines and to achieve repeatable power readings, dyno run after dyno run.

With water cooling on the large retarder you can run big grunter engines (500+ rwkw) for long periods of time without any sign of retarder fade.

Bottom line Geea the mph you run is proof of the power your car produces, if you know the weight of your car and the mph you've run over the 1/4 mile then basic math will show you the real power of the engine within 5 horsepower or so.

Peter

APS

<{POST_SNAPBACK}>

peter understand what your saying but its my understanding that as a retarder gets hot it loses eficiancy thus does not apply as much load which reduces force on the load cell reducing torque and power readings?

and to throw a spanner in the works I have retarder fans which cool verry eficiantly thus have never had retarder fade that I can remember?

dont know mate this one is beyond me?

all I can say is all welcome to come and see a re run?

[geea]

Hey Nick, sorry if my car has caused any grief. I'll be heading to Calder on 26th November, weather permitting. I will have my race tune, fuel and Nitto's. If you'd like to run it up whilst I'm on the way out I'd be more than happy to drop in. Hopefully you'll be able to figure out what happened.

Thanks again for a great day and making me king for a day, it felt good.

Geea.

[aps]

Nick I'm nearly sure you will find it's a retarder problem of some kind as I've never seen a car vary 60 rwkw's ( when in fact the car is not producing the power) of couse there are other facts which can vary the power such as acc rate and how the car is held on the dyno, etc, etc.

I have no doubt mate that you have a problem with the dyno as the power you measured (392 RWkW's) would result in a much bigger mph than what geea is seing at the track over the 1/4 mile. With that amount of power the car would run 125 mph at a minimum, our blue ute with 400 RWkW's would run 125 to 127 mph consistently.

In any event I hope you get to the bottom of the problem as it's frustrating when you know there's a problem though can't find any logical explanation.

Peter

APS

[Guest xrtwpn]

Even then 125mph to 127mph with 400rwkw is a low mph IMO for the power out put

Look around at other cars with similar power example the vl turbo with 400rwkw run 140 to 150 mph and yes the cars are lighter but the xr6t should still run at least 130 to 140mph our times wont be at higher due to weight but the mph should still be up there

This is what has got me confused about these cars they have big power but they dont pull the times to back the power up

Coming from a ls1 world where with 350rwkw the car can pull 125+ mph without much problem why cant these cars ???

and before someone says it having traction problems on street tyres has nothing to do with it when you bolt a set of slicks on your mph will be slower but your time will be quicker

[aps]

Even then 125mph to 127mph with 400rwkw is a low mph IMO for the power out put

<{POST_SNAPBACK}>

Well the mph all comes down to both the the power and weight of the car.......that simple.

Peter

APS

Edited 15/11/04 10:21 AM by aps