Mph Vs Rwkw List

[ENVY-T]

Any Dynowog tunes here.

Mine was when I ran my PB.

[GreenXR6T]

Rob, in my limited drag experience I'm finding that a quicker 60' (say 0.1 better) and faster ET has marginally dropped rather than increased my mph by 1 to 2 mph in my auto.

It's a bit harder to get your head to understand it, and it seems to defy logic, so I'm going to try to work this out mathematically to see if I can prove it.

I think it's because if you have a good (or better) half track mph you'll complete the second half track more quickly, and have insifficient time to reach the mph that your accelerative capability could provide.

I have an applied maths background, so I tend to looks at numbers a bit differently.

I have a spreadsheet that where I have another rough way of comparing power, and that is by the average rate of acceleration of the car in the second half of the track, which takes into account half tack and full track speed, and the time taken to complete it. Of course gear shift times may infleunce results.

That leads to the other issue of peak power versus sustained power. Some people may have a good peak power level, but it drops off sharply (all over quickly). If you sustain the power/torque over a wider rpm you will have a good rate of acceleration. In the manual if you change to 4th in the second half track your average acceleration will be disadvantaged compered with a manual. In my 1st run in my manual F6 I believe I ran the entire 2nd half in 4th gear and picked up 47mph. My manual car is set is set up for sustained power up to around 7200 revs, so that gives you a different perspective on the matter.

I'm still new to all this, so I welcome comments from more experienced guys.

Brian

Your right Brian that with the better 60' time does not increase the mph. Your theory sounds on the money.

I just went over my time slips and the better 60' times didn't always produce a better time or mph.

Whatever the reason, mph is the true indicator of the real HP of the car.

The 60' time is how much traction you get off the line.

[GreenXR6T]

Brian, I alluded to this a couple of years ago, I summed it up as average power accross the rpm range..

It's all well and good having 300rwkw, but when it's late in the revs and drops off in 200rpm, it's not much good to you.

Every car that has posted a very good ET makes bulk power (Torque actually) early to get the weight moving and (as you say) Sustains that power to charge down the mph in the top half.

Boost = Torque. Get boost in as early as possible and your 60' & ET will benefit. Hold that power till the upper rpm limits and you have a good mph to reflect the power..

Further to this, as we discussed a while ago; your car wasn't that much quicker than mine to cover the second half of the track, even though it made nearly twice as much power..

Manuals probably suffer from ( this is my theory) time in each gear. Not shift time, not boost dropping off, not having less boost off the line, none of that!!

I managed a 1.61 60' in a manual with a stock clutch, don't give me the no boost off the line bolony arguement!

We not only have to manually shift (which isn't much slower than the A4) but we have to also shift once more (big hp guys twice) than the autos. Also time spent in the torque band is less. We move around the revs quickly and the car has less time to accelerate with each given amount of power at any particular rpm point (make sense) First gear is over in a blink, then we hit 2nd. Auto uses the available power for longer.. I drove around this issue and that's how I got good ET's from my power. Shift early, spend more time with the engine making power for the given gear. Shifting earlier also makes the engine load up, hence make boost quicker, hence make torque earlier - hence accelerate quicker.

Are we off topic enough??

Your right too in it's no good having say 400rwkw at 4000rpm and it drops off rapidly before 6000.

Won't changing earlier leave you in a torque hole (lag) and need more time to build up revs into the power band.

You've got the runs on the board in both ET's and 60' times I can't argue with that, just adding my unknowledgable opinion

Edited 23/04/08 02:03 PM by GreenXR6T

[GreenXR6T]

New tune= 392rwkw and a best of 115mph. M6

Edited 23/04/08 02:02 PM by GreenXR6T

[turbotrana]

Figures dont gel mate. You probably have less power than you "think" you have

[GreenXR6T]

I'm only relaying what my tuner has supplied me, a dyno sheet with 392rwkw.

[JP300]

Rob basically went out with a more agressive low down tune which gives him more torque down low so when the car is hot it may sacrifice the top end power. As Blueboost found when the cars are hot they can loose a few MPH. I have noticed this too, the car does not feel as strong. His previous tune was on par with gropers efforts (see table).

I have to compliment Rob-GreenXR6T, he gets full marks for effort... He ran nine times last night. I thought I was crazy when I ran 8 times in one night. He just kept saying that he was just having a lot of fun and did not care if he was killing his clutch or tyres!! Onya mate, that's the spirit!

Sorry back to the topic ... good to see some good numbers from C&V directly, how about a few more from their customers and also from some of the other shops? Cmon guys !!

Edited 23/04/08 10:36 PM by JP300

[CV PERFORMANCE]

Sorry back to the topic ... good to see some good numbers from C&V directly, how about a few more from their customers and also from some of the other shops? Cmon guys !!

They are all customers cars!

CV PERFORMANCE

[groper]

118mph I ran consistantly on a very hot, humid night in far nth qld summer. I doubt I had anywhere near 396rwkw that night...

at that speed, crossing the line in 4th gear (M6) is very near the revlimit and WAY out of the powerband so I have ordered a set of 3.46 diff gears instead of my 3.73`s.

this new gearing, combined with colder drier air this winter, I expect to see 122mph+ maybe more...

[MYWPN]

Any Dynowog tunes here.

I have a dyno wog tune.

wait to the near future I can assure you that mph will sky rocket