Went along to a Dyno shootout today at castle coombe with a local jap car club. Was a good day and as the only rotary in attendance i managed to show all those "boingers" a thing or two.
Made the second highest power of the day (got done by a woman in a R33 GTR:Grrr )
Managed 370BHP at the wheels at just under 1 bar :chat
and 322.4 lbft
It was a brand new Dastek dyno & i don\'t think the operator was fully up on how it works as the correction for RWBHP to FWBHP seems a bit out??
370 ATW
413 ATFW
After every run he was putting the car in neutral and allowing it to coast down to a standstill?
Anybody know if this is right? I thought you were supposed to allow it to slow down in the same gear that the run was performed in, to measure the drag through the entire transmission?
good results FWHP seems a bit low though.
Thanks
Lee
Yeah thats what i thought, i don\'t think there corrections figures are right.
I\'m sure they\'re supposed to let the car run down in gear?? I think they use the rolling resistance to measure torque too, as quite alot of peoples torque was lower than expected/previous results.
Here\'s the graph if anyones interested
(http://i165.photobucket.com/albums/u43/lum90/Dynoprintout.jpg)
if power is 370 rwhp fwhp should be approx 440 judging by my results from reworx dyno
Thanks
Lee
Yeah that seems more like it, cheers mate!
Nice result dude!
The coast down procedure is right,so the figures are pretty accurate,you certainly don\'t have a 70 hp drivetrain loss,43hp loss is about right.
I have used that Dyno with RX7\'s and it is very good,it ought to be since it cost £70,000 which 3 times as much as alot of other Dyno\'s.
Regards
Carl
Quote from: CarlThe coast down procedure is right,so the figures are pretty accurate,you certainly don\'t have a 70 hp drivetrain loss,43hp loss is about right.
I have used that Dyno with RX7\'s and it is very good,it ought to be since it cost £70,000 which 3 times as much as alot of other Dyno\'s.
Regards
Carl
Hi Carl does this mean that reworx Dyno is inaccurate then as i made 390.7 rwhp and 469.2fwhp. Im just interested as this was my first experience of a dyno
Thanks
Lee
Hi Lee,
You will have to ask ReWorx about that.
Dyno\'s are only a tool to tune a car safely,hp figures to an extent can be a bit taken with a pinch of salt,what matters most is how the car performs,if it feels and drives great then that is the main thing.
Regards
Carl
The operator of that dyno is a pretty decent chap.
We used the Dyno a few times last year,it has been in what must be nearly a year.
Regards
Carl
Thanks for that carl
Just seemed that my conversion from WHP to FWHP has lost me more BHP than others.
Here\'s an example-
Made 1 more BHP than me at the wheels but 20 more at the fly??
(http://i165.photobucket.com/albums/u43/lum90/johnhudsondynowheel.jpg)
(http://i165.photobucket.com/albums/u43/lum90/johnhudsondynofly.jpg)
As you said, the bloke is a top chap and couldn\'t have been more helpfull throughout the day.
but wgt do it from the hub not the wheel right or am i wrong?????
as do reworx i think, you would have slightley more drive train loss if this is at the wheels rather than at the hubs. could the extra losses also be due to a worn gearbox and or diff?
matt
reworx do it at the wheel not the hub
is reworx not a dynamics, same as thor and wgt?
http://www.mazdarotaryclub.com/forums/attachment.php?attachmentid=30873&d=1179853981
borrowed this from a post from warthog, i believe he has his car tuned there.
matt
reworx use a dyno dynamics......wgt use a dynapack
hey lum, nice figures, is this a target for me to aim to beat? :Tongue1
If you were to leave the engine in gear on the coast down to get a drive train power loss then you would also have the engine producing a significant drag load. That is why it should only be done in neutral.
Regards
Carl
on a hub dyno at Abbey, mine came out at 400 ath, 450 FW.
Thanks for the advice guys!
I\'m pretty happy with the figures & it\'s a great road car, which is what really matters!
Quote from: sweetiewellshey lum, nice figures, is this a target for me to aim to beat? :Tongue1
Not yet mate:p Spoke to greg yesterday and we\'re gonna add some extra timing, fit the 3 bar map sensor & hopefully run it up to 1.3 Bar
cool sounds good, when i get the t04r fitted should be able to run 1.0bar with current mods, the fuel pump might need upgrading if i want to put the boost any higher but we shall see :)
Lum - some nice figures .. what turbo are you runing etc ?
hes running a Garrett T04Z i believe
Indeed i am!
Street ported engine, Garrett T04Z (1.0 a/r) at 1 bar!
It\'s great!
Nice result Liam
Here\'s an interesting article that makes for good reading: http://www.pumaracing.co.uk/coastdwn.htm
Lum, that puts you in 430bhp bracket. However, what Carl is saying is that just because you develop more hp, it does not follow that your bhp losses through the gearbox go up - in other words, it\'s not linearly related to the engine power. At least, I think that\'s what he means. So it may well be likely that engine power is lower. However, what you do know is you are developing 370bhp at the wheels.
Quote from: LumIndeed i am!
Street ported engine, Garrett T04Z (1.0 a/r) at 1 bar!
It\'s great!
Cool .. just want to guage what my set up could produce when sorted out.
What setup are you running mate?