r/r results r33 gtst

[tommygtst]

quite happy ,just been to a rr night at star performance in kirkcaldy ,this is the first time its been dyno,d since i got the car , so after fitting a s.p.a. intercooler, decat, downpipe apexi induction, cold grade iridium plugs, hks actuator, avcr .95 bar (set up by callum at checkpoint)and blitz nurspec i finaly got round to getting some sort of map so just got a r.s.p stage one ecu ,fitted it on wednesday and straight away what a differance , the car flys now , pulls hard, no flat spots, fuelings now sorted, so well chuffed , but proofs in the pudding as they say say!! so change oil,and filter,and fuel filter cleaned air filter this morning and the the results from the dyno tonight are

engine output 340 bhp
wheel output 272
drag output 68
torque 256

[Richf]

68hp transmission losses seems a little high

[tommygtst]

68hp transmission losses seems a little high

think 20% tranny loss is about right isnt it ??

[Richf]

I dont know tbh i've had my car on the dyno around 4 times and had different figures each time

I've heard 35-45hp losses on GTST's being suggested as well

[The Mad Welsh Man]

I think its all down to where (who you take it to) and what make rolling road is used

[skid]

I dont know tbh i've had my car on the dyno around 4 times and had different figures each time

I've heard 35-45hp losses on GTST's being suggested as well

Mine on Abbbey`s Dynopack was 36bhp on transmission loss

[Richf]

Mine on Abbbey`s Dynopack was 36bhp on transmission loss

Thats not actually measured thought is it???

Thor who also use a dynapack dyno werent able to tell me the flywheel power for my car but said drivetrain losses would be between 30 and 60hp

As far as i understand (feel free to correct me) the dynapack dyno doesnt measure the drivetrain loss figure all you get is the figure at the hubs

As opposed to "most" conventional dynos which measure the power at the rollers and then during the run down cycle measure the drivetrain losses and by adding these two figures together they give a flywheel figure

36hp seems low to me and logically I would expect the more hp a car makes the greater the losses due to drag from friction and oil in the gearbox and diff

Of course its a case of does it really matter at the end of the day dyno results do vary greatly depending on type and time of year and are essentially meaningless for comparison purposes

[skid]

Thats not actually measured thought is it???

No Idea to be honest, but one graph was a flywheel figure and the other was of an at the hubs output and consequently the difference was 36

[Checkpoint]

dyno results do vary greatly depending on type and time of year and are essentially meaningless for comparison purposes

Yip.

Dyno's are very over rated, no two makes give the same output and few are repeatable.
Plus the dyno enviroment is far from what you get on the road. An example... we mapped an Evo 6RS on the way to the dyno and it ran perfectly, afr's etc were spot on... ran it on the dyno and it looked terrible afr's looked miles out (still made 603bhp tho ) and the dyno's afr readings were miles from our own equipment! Obviously we never changed anything and re checked it on the way home.... Still Perfect!

This was a new Dyno Dynamics!

[Checkpoint]

Lol, just noticed it was Star's dyno you were on Tommy.... my old GTST made 350 odd bhp on their MAHA dyno with a std ecu at 0.8bar about 5 years ago .... if you believe it

I'm sure the transmission losses were calculated at about 70 odd bhp, but that was wit 4 adults in the car VERY tight straps and a fat git in the boot to stop it spinning

I have a video of it somewhere.

[moddingdog]

I thought 320bhp was the max on stage 1 mods with RSP ecu upgrade?

[Checkpoint]

I thought 320bhp was the max on stage 1 mods with RSP ecu upgrade?

Not if it's on a MAHA

I'm sure Tommys car is running much better with the ecu as the std ecu's fuelling and timing are not exactly great (being polite)