Actually, the big question in my mind is now why peak torque and peak dissipated power were both 300rpm higher on run 1 than on the other 2 runs. The higher engine speed on run 1 explains the higher dissipated power since peak power is a function of torque and engine speed.

Actually, the big question in my mind is now why peak torque and peak dissipated power were both 300rpm higher on run 1 than on the other 2 runs. The higher engine speed on run 1 explains the higher dissipated power since peak power is a function of torque and engine speed.

Not certain....but could it be because the car got clamped down onto the rollers with cool tyres....then as the runs progressed the air in the tyres heats up and increases thus forcing the tyre into the rollers a bit more causing more drag and loss of top end power??

I do know that when VW Driver mag did their article that making the tyre pressures higher helps reduce drag from the rollers due to the clamp down straps!

tbh i dont trust amds rollers, but good figures none the less, i run 213bhp on there and 373llb/ft of torque lol with my spec below standard pd150 not a hybrid

Who really gives a flying....

If it feels pokey then it probably is.

People must be jealous.

My willy sometimes performs better on different girls, oh well

Exactly who gives a toss lol doesn't matter if amd over read, everyone go to amd then they will all be on the same scale. I just like janner sy is annoyed as Ross did a faster 0-60 and quarter mile time than him in a fwd diesel which he can't seen to accept lol aswel as him not being able to launch an automatic car lol :p

Sure look what happened to me when I quoted figures lol talk about an argument, regardless of what people say about the rollers if it say XXXbhp on the screen then what do you expect people to say lol

Brilliant hit a nerve have we lol

Sent from my MZ601 using Tapatalk because I can

As lots have said, you`ll never get an exact figure. You`ll get a good comparison by going to a decent RR and all going on the same day. But then even with that, there temperature raising thru the day etc. It`s how the car drives and performs more than anything.

Matt

Lets save it for the Pod! Anyone up for VAGfest later this year (if its on?)

OK - checked calendar but not on, maybe GTI festival October 16th. For watercooled "VW"

Shame I doubt I will have the new turbo on by October - probably going to be a Winter project now

Just provoking a little debate Jason.

Three more days before the pod... really need to pracice the starts.

Going there because at the end of the day, it counts a lot more than some "represenative" figure that can change from one day to the next.

Seems retarded but OK my car is 163bhp.....

Mine is a pd130.. So 130bhp ;-)

Haha

Just provoking a little debate Jason.

Three more days before the pod... really need to pracice the starts.

Going there because at the end of the day, it counts a lot more than some "represenative" figure that can change from one day to the next.

Looking forward to the times! If you don't pop consistent mid 13s I will be very surprised. Just watch those starts as if you feel the front end "juddering" off the start line, that's likely to be wheel hop and that kills CV joints (as I found out on the pod strip engaging 3rd gear a while back) - Nothing worse than being towed off the quarter mile....

Theoretical maximum for the standard PD130 injectors is about 210-215hp.

Thats where laws of physics (SOI vs. duration) ends and braking during coastdown starts.

I remember once mine was rollered at 163bhp and then another run at 173bhp, then 178bhp and then 195bhp or something... 4 runs and 4 completely different figures.

Who's to say it wouldn't run over 200bhp on the next run?

Then when I had my current figures... It ran 233bhp, then 240bhp, and then he stopped... Next run could have been 250bhp? Who knows?

4 runs, 4 completely different figures, no tuning between the runs?

Everyone here who owns/runs a dyno knows how that was done

Looking forward to the times! If you don't pop consistent mid 13s I will be very surprised. Just watch those starts as if you feel the front end "juddering" off the start line, that's likely to be wheel hop and that kills CV joints (as I found out on the pod strip engaging 3rd gear a while back) - Nothing worse than being towed off the quarter mile....

Any pointers more than welcome Jason.

What actually causes wheel hop?

When I did my 0-60 vid I had the traction control on so don't think I got any.

Theoretical maximum for the standard PD130 injectors is about 210-215hp.

Thats where laws of physics (SOI vs. duration) ends and braking during coastdown starts.

Thanks for confirming what I suspected, unfortunately most people simply aren't listening or won't believe you.

Interesting seeing your intercooler heatsoak illustrated so graphically across the three power runs CT17, do you use spraybars on it?

Jason a new turbo?? Lol same as the one now or bigger? And what can we expect? What are the limits and factors which decide what turbo can and can't be fitted? Or can any turbo be made to fit?

Any pointers more than welcome Jason.

What actually causes wheel hop?

When I did my 0-60 vid I had the traction control on so don't think I got any.

wheel hop is caused by movement in both the suspension and the dogbone mount under shifting, but its mainly in the suspension to be honest. With decent condition coilovers, wheelhop should be minimal really.

Any tips? Well, ideally you want to start in 2nd, but with my old clutch I could never get 2nd gear starts right - either too much revs or the engine just died due to such a sharp bite point. The new one might be more condusive. I would say start in 1st but quickshift to 2nd quite early and then simply redline all the gears (if your tuning is anything like mine anyway it will go right to the limiter hard)

New turbo? Yes, ultimately I am planning to fit a hybrid version of the same turbo I have now.

Cheers.

Cheers.

No worries

Also, I might be wrong, but I think in your three dyno runs you calculate your wheel horse power by deducting dissipated power on each run from the crank HP. When doing that, each run is pretty much around 240 wheel horse power, which is pretty darn good!

(WHP is the true power ultimately and the rest is down to calcs and deductions)

wheel hop is caused by movement in both the suspension and the dogbone mount under shifting, but its mainly in the suspension to be honest. With decent condition coilovers, wheelhop should be minimal really.

Yep!!!

Also with lowered stiff suspension it happens more because of the preload on the suspension itself........fit a set of anti-lift console bushes like these to help get rid of it!!!

http://www.superpro.eu.com/catalogue/16/skoda-fabia-mki-2000-_to-2005/#SPF3273K

Theoretical maximum for the standard PD130 injectors is about 210-215hp.

Thats where laws of physics (SOI vs. duration) ends and braking during coastdown starts.

so jabba have manufactured another 50+bhp on mine?

but surely less fuel is needed for the bigger turbo to get the power, then having a smaller turbo and maxxed out fueling??

so jabba have manufactured another 50+bhp on mine?

Yep, looks like a "corrected" flywheel figure from where I'm sitting.

Putting my statistical analysis hat on for a second, if you do say 4 runs, and each gives a slightly differenct figure, surely the correct figure to quote is not the highest, nor the lowest, but the average of the runs?

Putting my statistical analysis hat on for a second, if you do say 4 runs, and each gives a slightly differenct figure, surely the correct figure to quote is not the highest, nor the lowest, but the average of the runs?

Now for the maths....which average?????? Do you add all the figures together and then divide by the number of figures.........or.....do you take the highest and the lowest figures and add them together and divide by two???

I think theres another way......brains a bit tired...but I think there are three ways....Mean, mode, median??????.....abit fuzzy I know!!! :S

Now for the maths....which average?????? Do you add all the figures together and then divide by the number of figures.........or.....do you take the highest and the lowest figures and add them together and divide by two???

I think theres another way......brains a bit tired...but I think there are three ways....Mean, mode, median??????.....abit fuzzy I know!!! :S

Indeed!

Mean = Add all together and divide by number of figures

Mode = Most common value

Median = middle value

I'd go for the Mean value.

So, (283.3 + 276.8 + 267.9) / 3 = 276.0

Thankyou class, that's your maths lesson over for the day