Mph Vs Rwkw List

[cooltint]

I consistantly run 107 - 108 mph with around 250rwkw (it's still stock).

Big AL

Edited 20/04/08 09:19 AM by cooltint

[ENVY-T]

12.25 @ 116mph 270rwkws 4 spd stock stall

[blueboost]

a dyno will show a power figue, that the car can make, over the 5 or so seconds it takes to do a dyno run,

if you have a good intercooler, your car might be able to back that up straight after with the same or similar figure, then again, the same figure a third time.

a stock cooler can run an ok figure the first time, say 280rwks, then back that up straight away, and it will run 250rwks, then again and 240rkws,

the same happens down the quarter, you rev it doing your burnout, then rev it right through first, then right through 2nd, the most times right through 3rd,

just like three back to back runs, so two cars with 300rwks (auto's) one can run 119mph, and the other(with a stock cooler might run 112-114mph,

without back to back runs, or very slow ramp rates, you don't alway's see how good the cooler works.

then this is exagerates in hot times of the year,

plus there can be a 2-4 mph difference, if you cool the car right down in between runs, like some push there car up the lanes after cooling them down for an hour,(turbo cars)

hope this puts some light into why some mph's can be so different to others.

there is other reasons to, like the average power through the revrange, but and some over conservitive compensations in temp to timing in the tune to, but heat soak is the biggest one,imo

I did a test with a car, auto standed cooler, it made 280rwks, hot weather, she ran 112mph,

same car, same tune, same boost,(car still had all the standed top pipework and restrictions)

but with a good cooler on the front, the car made 290rwks,

it ran (hot night 117 mph)

hope this makes sence.

David

Edited 20/04/08 10:03 AM by blueboost

[senna_T]

hmmm, so why is my MPH so low? I'm at the top of 4th gear just before rev-limit when I cross the line...

[GreenXR6T]

  senna_T said:

hmmm, so why is my MPH so low? I'm at the top of 4th gear just before rev-limit when I cross the line...

What diff you running?

I have a 3.46 and was just changing into 4th before the line.

[senna_T]

just stock diff mate

[GreenXR6T]

  senna_T said:

just stock diff mate

Yours is a 3.8:1 ratio then, the difference is quite a bit.

A 4.1 would mean another gear change.

[senna_T]

3.73 isn't it? either way it seems my car isn't backing up its feel on the strip

[GreenXR6T]

  senna_T said:

3.73 isn't it? either way it seems my car isn't backing up its feel on the strip

That's the one.

You should've told me that first up and I wouldn't have made a d**k of myself.

[senna_T]

no dramas mate, when are you hitting the track again? now you have your "angry" tune it should be a bit more fun!