Geo Posted October 16, 2006 Share Posted October 16, 2006 Ok all, im BPU but not had a chance to get it on a rolling road to find out the performance. Boost goes to 1.2. Any idea's of what it would be?? Quote Link to comment Share on other sites More sharing options...
Jake Posted October 16, 2006 Share Posted October 16, 2006 Auto? Manual? Autos, usually between 290 and 310 at the wheels on a rolling road or between 350 and 400 on a hub dyno like Thor's. Quote Link to comment Share on other sites More sharing options...
Pig Posted October 16, 2006 Share Posted October 16, 2006 Auto? Manual? Autos, usually between 290 and 310 at the wheels on a rolling road or between 350 and 400 on a hub dyno like Thor's. lol, funny! Quote Link to comment Share on other sites More sharing options...
Jake Posted October 16, 2006 Share Posted October 16, 2006 lol, funny!Huh? What's funny? Quote Link to comment Share on other sites More sharing options...
Geo Posted October 16, 2006 Author Share Posted October 16, 2006 Manual mate. so im looking at 400bhp then? Quote Link to comment Share on other sites More sharing options...
Pig Posted October 16, 2006 Share Posted October 16, 2006 Huh? What's funny? Ahhh, miss read slightly. I read it as there would be an extra however many HP @ Thor. Quote Link to comment Share on other sites More sharing options...
Jake Posted October 16, 2006 Share Posted October 16, 2006 Not 400 at the wheels, that would be very unlikely. My BPU auto makes 300rwhp on a RR and 350.5rhhp on a hub dyno. A manual TT should make a little more but not a huge difference. You can claim 400 flywheel from just 270rwhp if you like, just allow 33% losses. A lot of folk's flywheel bhp claims are unrealistic. Quote Link to comment Share on other sites More sharing options...
Jake Posted October 16, 2006 Share Posted October 16, 2006 Ahhh, miss read slightly. I read it as there would be an extra however many HP @ Thor.There would be. The Thor dyno is well known to be rather 'ego flattering'. Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted October 16, 2006 Share Posted October 16, 2006 Indeed, my car gained 40 rw 'X' p on their dyno Quote Link to comment Share on other sites More sharing options...
Pig Posted October 16, 2006 Share Posted October 16, 2006 Not 400 at the wheels, that would be very unlikely. My BPU auto makes 300rwhp on a RR and 350.5rhhp on a hub dyno. A manual TT should make a little more but not a huge difference. You can claim 400 flywheel from just 270rwhp if you like, just allow 33% losses. A lot of folk's flywheel bhp claims are unrealistic. I claim 25% losses on an auto. Only cause it give me a pub figure of 500bhp lol. If im talking to people who know what they are talking about its 380RWHP. There would be. The Thor dyno is well known to be rather 'ego flattering'. I know.....thats where ill be off to when im in need of a good print out to put on the for sale section. lol edit: done the maths....im claiming about 32%....bless my heart eh! Quote Link to comment Share on other sites More sharing options...
Jake Posted October 16, 2006 Share Posted October 16, 2006 You got 380rwhp on a rolling road, right? Not a hub dyno? 380rwhp = 500 flywheel if you allow 24% losses. That sounds fair enough to me mate. It's the folks that allow 20%-25% losses for a hub dyno that are kidding themselves, IMO. Quote Link to comment Share on other sites More sharing options...
Jezz Posted October 16, 2006 Share Posted October 16, 2006 You got 380rwhp on a rolling road, right? Not a hub dyno? 380rwhp = 500 flywheel if you allow 24% losses. That sounds fair enough to me mate. It's the folks that allow 20%-25% losses for a hub dyno that are kidding themselves, IMO. Is the actual loss figure on a hub dyno a big can 'o' worms? I would have thought about 15%? Quote Link to comment Share on other sites More sharing options...
Ewen Posted October 16, 2006 Share Posted October 16, 2006 Sorry, but I'm not understanding the difference between a rolling road dyno result (at the wheels) and a hub dyno result (at the wheel hubs)...are they not measuring the same point of the power train ? Is there that much loss between the hubs and the tyre footprint ? Yours, thick but curious. Quote Link to comment Share on other sites More sharing options...
Jake Posted October 16, 2006 Share Posted October 16, 2006 Is the actual loss figure on a hub dyno a big can 'o' worms? I would have thought about 15%? Well, using my car's results and 24% drivetrain losses as an example: 300 rwhp (measured at Surrey Rolling Road) = 395 flywheel bhp allowing 24% drivetrain loss (24.0506329113924% if you want to be picky) We can calculate that the 350.5 rhhp (measured at Thor) = 395 flywheel allowing 11% drivetrain loss. (11.2658227848101%) Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 16, 2006 Share Posted October 16, 2006 Sorry, but I'm not understanding the difference between a rolling road dyno result (at the wheels) and a hub dyno result (at the wheel hubs)...are they not measuring the same point of the power train ? Is there that much loss between the hubs and the tyre footprint ? Yours, thick but curious. Massive amounts matey. The tyre grip on the road isn't free, it's friction, and lots of it. My dyno place used a transmission loss of about 7% for a manual. I was impressed. -Ian Quote Link to comment Share on other sites More sharing options...
Jake Posted October 16, 2006 Share Posted October 16, 2006 Sorry, but I'm not understanding the difference between a rolling road dyno result (at the wheels) and a hub dyno result (at the wheel hubs)...are they not measuring the same point of the power train ? Is there that much loss between the hubs and the tyre footprint ? Yours, thick but curious. A hub dyno makes no allowance for the weight of, and the other losses caused by, the wheels and tyres. You wouldn't think it would make a huge difference , right? Neither would I, but it seems to if you compare people's results. At the end of the day, any dyno (RR or Hub) can be adjusted by the operator to give inaccurate and flattering results. Giving inflated power figures is good for business - people like good news. Quote Link to comment Share on other sites More sharing options...
supRo Posted October 16, 2006 Share Posted October 16, 2006 The most powerful BPU cars made between 325 and 340 RWHP at Surrey Rolling road in one of the RR days Quote Link to comment Share on other sites More sharing options...
cleland Posted October 16, 2006 Share Posted October 16, 2006 My car did 416 flywheel and 348 at wheels on a dyno dynamics in bpu tune, dont know how accurate it was. I was running 1.3 bar!. Quote Link to comment Share on other sites More sharing options...
TrickTT Posted October 17, 2006 Share Posted October 17, 2006 Have a look at this thread: http://www.mkivsupra.net/vbb/showthread.php?t=76414&highlight=midlands+rolling+road Think these figures are about as accurate as you'll get on a RR dyno, there was 2 stock cars, 1 uk and 1 jap which both made just over 300bhp, a couple of bpu which made around 350 - 380 and mine which is really bpu+ made 418. The two cars with hybrids made 440-450bhp Quote Link to comment Share on other sites More sharing options...
JohnA Posted October 17, 2006 Share Posted October 17, 2006 Yep, on a dyno that shows 300bhp for a stock JSpec, expect to see 350-360max while at 1.2bar. You can always add another 40-50% as 'losses', but it won't make the car any faster. Quote Link to comment Share on other sites More sharing options...
Pete Posted October 17, 2006 Share Posted October 17, 2006 My BPU auto makes 300rwhp on a RR and 350.5rhhp on a hub dyno. Yup, mine was 304rwhp on the RR - http://www.mkivsupra.net/vbb/showpost.php?p=1043482&postcount=88 Quote Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted October 17, 2006 Share Posted October 17, 2006 Im BPU, with a mapped emanage will that eek out an extra 2 or 3 BHP or something? im still trying to work out the need for a mapped ECU with stock turbo's Quote Link to comment Share on other sites More sharing options...
Pete Posted October 17, 2006 Share Posted October 17, 2006 Im BPU, with a mapped emanage will that eek out an extra 2 or 3 BHP or something? im still trying to work out the need for a mapped ECU with stock turbo's Mine was overfuelling by a crazy amount (as they do) so I'd imagine another good 10bhp or more is possible through fuelling alterations. Quote Link to comment Share on other sites More sharing options...
Jim_1979 Posted October 17, 2006 Share Posted October 17, 2006 you should see more with a mapped ECU of some sort mate. When I had my old mr2 people with the same mods but without a mapped ECU were making 20bhp less than me. Quote Link to comment Share on other sites More sharing options...
Getrag Posted October 17, 2006 Share Posted October 17, 2006 Made 378lb/ft at 1 Bar on RR. Was just happy it was fueling well to be honest. A bit rich infact, as above, so would love to map. Quote Link to comment Share on other sites More sharing options...
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