Euro/UKand US spec cars are broadly the same, engine, transmissions and turbo's are identical.crazydriving said:what is the max boost preassure on a stock Eurospec supra...
and how many rwhp does a bpu supra with 20psi max boost preassue got?
Oh - I'm glad someone from England straightened us Yanks out as to how US dynos work.Syed Shah said:No, American dynos do RWHP as crank, so really that 400rwph is 400 @ crank and 470 is rubbish.
But one of the problems with this if getting confirmation of the RWHP of a stock MKIV dyno'd in the US. I have seen two figures quoted recently one of which was 305 RWHP(some 45 hp more than the other). Now correct me if I am wrong here but I can't see how you derive 305 RWHP from a 326 crank HP car, manufacturers figures remember.VickSupra said:
Oh - I'm glad someone from England straightened us Yanks out as to how US dynos work.
D'oh. do your homework.
Dyno measures HP at the wheels (RWHP for the Supra).
Typical drivetrain losses are about 15% for 6-spd and 20% for auto.
If a BPU 6-spd dynos 400 RWHP, then crank is about 400/(1-.15) ~ 470 crank.
If a BPU auto dynos 400 RWHP, then crank is about 400/(1-.2) ~ 500 crank.
Gavin Loughton said:Now correct me if I am wrong here but I can't see how you derive 305 RWHP from a 326 crank HP car, manufacturers figures remember.
I know that some other cars and particular model of cars are under-rated by the manufacturer.
FWIW, also see this listing of engine specs.
I notice that the Japanese model 2JZ-GTE is "voluntarily" under-rated at 280 hp. Also look at the "Aristo" JP rating and comments (rated 280, real ~ 350).
I don't know about the Euro-spec version.
US dyno's appear too measure hp somehow differently.
I can agree here to the extent that our two main brands of dynos (Mustang and Dynojet) yield different results.
Again, I would not presume to tell you what UK dynos measure.
I do know that I got 327 RWHP at low boost and no DP. I look forward to dynoing again now that I am BPU. I fully expect to show 380-400 RWHP at higher boost (18 psi).
BTW - As far as I am aware, our "corrections" to RWHP measurements (and even 1/4 mile times) are to bring them to a standard temperature and atmospheric pressure for comparative purpose - NOT to estimate crank HP.
I suggest a little homework in the Performance/Dyno section here.Syed Shah said:Exactly Gavin, US dynos measure much higher, and you also have this "corrected" RWHP figure.
Basiclly, a stock 6sp should give about 260-70rwph and a BPU should give around 320RWHP max.
US dyno's appear too measure hp somehow differently.VickSupra said:
I am seriously at a loss for words in regards to this guy's statments.Basiclly, a stock 6sp should give about 260-70rwph and a BPU should give around 320RWHP max.
Come too the UK there are loads of them! Please read the messages above and make sure you understand them before you post ill considered remarks.ThomasKenyon said:
I am seriously at a loss for words in regards to this guy's statments.
I bet there is not a single, well tuned, BPU Supra putting down only 320 RWHP.
Anywhere in the world for that matter!!
This thread is proof that driving on the wrong side of the road can have a dramatic effect on one's intelligence.