hi all

took my car to TDI at lakeside today for a cylinder leakage and compression test and a power run on there dyno!

first just like to say how good they are!

got a power fig at 231.8hp and 237.2 lb-ft at the hubs!

how do i covert this to the flywheel?

 

What car do you have? and most places normally quote you flywheel power

Tony

 

its an 96 wrx wagon!

they did tell me how to convert it there but me being me forgot what they said! they do it to the hub as you get a truer reading as every car as we all know is different ( i.e looked after, driven ect) so the amount of lose throw gear box drive shafts and that will be slightly different! where the power at the wheels is what it reads!

 

231bhp is above the 218bhp they are out of the box so not too bad if its standard

Tony

 

218 is that what they are at the hubs standered? what they at the flywheel standered? might be able to work it out for mine!
thanks, its not standered but not much done yet! just go to get a new ecu before i can do much more to it!

 

220ps so equates to about 218bhp, normally its 22% losses on a 4wd car.

 

so that would make mine around the 282bhp mark! not bad! few more mods planned soon so it will go up!

 

But that 218bhp is at the flywheel though! (Manufacturers always quote the highest of measuring standards, for obvious marketing reasons).

When you do the flywheel correction to the OP's 231.8bhp at the hubs, it's even more impressive!... If you add on about 20% (give or take) - for the engine and 4WD losses - then the OP's looking at around 280bhp-odd FWHP!

 

OP beat me to it... hadn't refreshed the page before posting

 

losses from a hub dyno will be low, depending on the gear it will be in the 35-60hp range at that power level.

 

Ah I think we have crossed wires, 220ps is the fly power, if you have 231bhp with an exhaust and filter for instance, then that isn't bad, but that is fly bhp, not wheels/hub.
The WRX 5 door (wagon) runs a different turbo to that of the saloon on your year car, so unless its had some major mods, its as bout as powerful as a uk car with similar mods (then take the 22ish percent off).

Tony

 

Well, OP does categorically state that it's 231.8 at the HUBS (as mentioned by the tuner,TDI) - so no reason to believe that's wrong info.

So that being the case, it must have the usual supporting mods and a remappable ECU fitted, as that would indeed give about about 280bhp at the FLY i.e.therefore the 231.8bhp at the HUBS.

 

OP clearly says 231hp at the hubs, so more power at the flywheel. bhp is traditionally used to mean at the flywheel as measured by a brake (old skool term for engine dyno).


Eh?

Do you mean, you would expect it to make around the same flywheel power as a mildly modded UK car, which would equate to the 231hp measured at the hubs?

 

BHP levels sells cars, torque figures wins races So how many lbs of torque was your car producing??

 

the 231hp is def at the hubs and not the flywheel!

it has an apexi turbo exhault air filter and a chip on the ecu from a jap company bozz speed! got to get a few things sorted but not alot!

280ish will do me for a bit till i save up a few quid!!

 

237.2 for torque so if you work that out the same way around the 290 mark!

 

If you read what i put before you will note i did say unless the car has some serious mods then its going to equate to that of a mildly tuned uk car, 280bhp is top end (very top end) of the tuning scale on a TD04 turbo, and there were no mention of chips, just mildly modded which to me is exhaust and filter, so 231@fly would be about right for those on a normal car (plus i dont rate dyno hub testing that much, next rolling road could drop that 20bhp)

OP, you need to see what turbo is on there, it SHOULD be a TD04 as its a wagon, it may have been changed to reach 231bhp@hubs or the dyno is out.
Oh and the torque, remembering they measure it 1ft off the engine (hence lb-ft), 237 seems right for 280bhp on an older car, it doesnt quite convert the same way as bhp.

Tony

 

the turbo was changed from the td04 to and apexi unit!
tryed to find out some info on them but didn't find much, only they are sort after in japan and not many about for sale any more! its an IHI turbo that apexi gave the spec for!

 

Sorry just a question on the above, my 94 type-ra had a rolling road run and got 247.6hp and about 245 ftlb torque.

does that sound about right ??

 

If unmodified, then you should be very happy... should be 'only' 237bhp/224lb ft std This is entirely normal - some motors make a bit more; some a bit less. That said, your torque is nice and high, compared to std.

When I had mine RR'd before any mods, I got 249.5bhp (can't remember the torque, but it was a similar % increase to the bhp figure).

 

Goto rototests own database at Powertrain Performance Graphs - Rototest Research Institute and Powertrain Performance Graphs - Rototest Research Institute and compare your numbers to those on stock/other scoobs, then you'll know what you've gained!

Simon