Chris Bailey Posted July 9, 2016 Share Posted July 9, 2016 (edited) So a few months ago we had the supra dyno'd. These were the figures at Abbey Motorsport on the hub dyno. 654rwhp on V-Power 708rwhp on E70 Would anyone have a rough idea what the loss is for autos? Roughly 15%? I'd like to know a rough figure for the flywheel power, I'd imagine 750+bhp on Ethanol. *Once the stage 4 SRD box is fitted it will be going back on the dyno* Edited July 10, 2016 by Chris Bailey (see edit history) Link to comment Share on other sites More sharing options...
Luxluc Posted July 9, 2016 Share Posted July 9, 2016 Add 40-50 bhp to rhhp to get fwhp mate Link to comment Share on other sites More sharing options...
Mk4Gaz Posted July 9, 2016 Share Posted July 9, 2016 Pretty sure it's loosely 15% on manuals, and 18% on autos bud. But, when mine was mapped on the hub dyno, I was told that the power figure given was fwhp despite being measured at the hubs. I can't remember the reason why? This was from torque developments Link to comment Share on other sites More sharing options...
a98pmalcolm Posted July 9, 2016 Share Posted July 9, 2016 Hi Chris, yep 15% difference Link to comment Share on other sites More sharing options...
johnny g Posted July 9, 2016 Share Posted July 9, 2016 Autos are notoriously difficult to get accurate engine numbers from. Stick with RWHP as that's power to the ground and is all that matters Link to comment Share on other sites More sharing options...
mplavery Posted July 9, 2016 Share Posted July 9, 2016 Autos are notoriously difficult to get accurate engine numbers from. Stick with RWHP as that's power to the ground and is all that matters As above, I be over the moon saying my car is 708RWHP It's only when your car not pushing much power like mine (BPU) then we say what the fly wheel is lol Link to comment Share on other sites More sharing options...
Luxluc Posted July 9, 2016 Share Posted July 9, 2016 Rhhp is NOT rwhp. Link to comment Share on other sites More sharing options...
Big Mark Posted July 9, 2016 Share Posted July 9, 2016 15% for autos, not sure for manuals tho 10 or 12% I think. Link to comment Share on other sites More sharing options...
Luxluc Posted July 9, 2016 Share Posted July 9, 2016 That is the case if you go on a rolling dyno ; dynapack (hubdyno) are different. Link to comment Share on other sites More sharing options...
JackyBoi Posted July 9, 2016 Share Posted July 9, 2016 When people ask how much power my car has I always give them a wheel horsepower figure not the flywheel one, anyone else the same? Seems a bit deceiving saying a power number that never reaches the ground lol Link to comment Share on other sites More sharing options...
kitch79 Posted July 9, 2016 Share Posted July 9, 2016 When people ask how much power my car has I always give them a wheel horsepower figure not the flywheel one, anyone else the same? Seems a bit deceiving saying a power number that never reaches the ground lol /QUOTE] Manufactures don't so why bother. If you bought the new Dodge Challenger hellcat with what they say is 707bhp, if asked what power does it have would you say to them "ooh 600" ... Hell no ha. Link to comment Share on other sites More sharing options...
Lee P Posted July 9, 2016 Share Posted July 9, 2016 Abbey is a hub figure, we usually add around 40-50hp on for flywheel with a manual car, auto would be a bit more. That's just a guess though so It's best just to go by the hub figure as that is the true figure. Link to comment Share on other sites More sharing options...
Chris Bailey Posted July 10, 2016 Author Share Posted July 10, 2016 Abbey is a hub figure, we usually add around 40-50hp on for flywheel with a manual car, auto would be a bit more. That's just a guess though so It's best just to go by the hub figure as that is the true figure. So for an auto what you thinking add like 60-70hp? Link to comment Share on other sites More sharing options...
Luxluc Posted July 10, 2016 Share Posted July 10, 2016 750+ bhp on ethanol Chris Link to comment Share on other sites More sharing options...
Chris Bailey Posted July 10, 2016 Author Share Posted July 10, 2016 750+ bhp on ethanol Chris That was my thinking, not bad really. But 708rhhp isn't to be sniffed at. Not a touch on yours though Link to comment Share on other sites More sharing options...
Guest Budz86 Posted July 10, 2016 Share Posted July 10, 2016 I've always quoted the hub figures as a lot of people I know have used abbey and it's just become the benchmark as there are no variables. Plus, as people say the whole percentage loss to calculate the fly figure is just a guess. There is also the whole argument that it shouldn't be a percentage at all as you would have the same amount of loss regardless of how much power you're making overall. Link to comment Share on other sites More sharing options...
Chris Bailey Posted July 10, 2016 Author Share Posted July 10, 2016 I've always quoted the hub figures as a lot of people I know have used abbey and it's just become the benchmark as there are no variables. Plus, as people say the whole percentage loss to calculate the fly figure is just a guess. There is also the whole argument that it shouldn't be a percentage at all as you would have the same amount of loss regardless of how much power you're making overall. /QUOTE] How much power is yours at the rear hubs? Link to comment Share on other sites More sharing options...
Guest Budz86 Posted July 10, 2016 Share Posted July 10, 2016 700 on pump and 800 on E60. 570 and 630 ft/lbs respectively Link to comment Share on other sites More sharing options...
Chris Bailey Posted July 10, 2016 Author Share Posted July 10, 2016 700 on pump and 800 on E60. 570 and 630 ft/lbs respectively /QUOTE] Not bad, we are unsure on torque. Got to put it back on the hub dyno once the stage 4 box has been fitted. Link to comment Share on other sites More sharing options...
ibby Posted July 10, 2016 Share Posted July 10, 2016 Stage 4 box ? Link to comment Share on other sites More sharing options...
jcbt Posted July 10, 2016 Share Posted July 10, 2016 Stage 4 box ? /QUOTE] We are auto and the uprated box we currently have is an SRD stage 3 box which will be upgraded to a stage 4 this winter Link to comment Share on other sites More sharing options...
ibby Posted July 10, 2016 Share Posted July 10, 2016 Oh right, i thought the only upgrade was a getrag auto or a bmw gearbox. Link to comment Share on other sites More sharing options...
Sheefa Posted July 10, 2016 Share Posted July 10, 2016 Lee told me to stick with the hub figure mate as I started quoting circa 850fwhp Mine in reality is about 800 but I'm sticking with the 753 wheel figure Link to comment Share on other sites More sharing options...
Chris Bailey Posted July 11, 2016 Author Share Posted July 11, 2016 Thats what we normally tell people is the hub figure, just didnt know if there was a definate answer at all. Link to comment Share on other sites More sharing options...
ShawnPreece Posted July 12, 2016 Share Posted July 12, 2016 When people ask how much power my car has I always give them a wheel horsepower figure not the flywheel one, anyone else the same? Seems a bit deceiving saying a power number that never reaches the ground lol I like being part of the 700 club... don't take this away from me haha Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now