Dyno sheets and discussion for UK Rotaries!

[Warthog]

Rich just sent you a PM on the FDUK site.

[John Yorke]

What were your dyno dynamics figures John compared to dynapack?

Did them back to back to ensure the tests were the same

Dynopack [Abbey]: 346.5 ATH @ 7238rpm 291.2 FW torque @5640rpm
AFR 11.5 , boost 1.0 bar

Dyno Dynamics [CPL]: 315.7 ATW @ 7200 265 Ftlbs torque @5640 ATW

Works out about 10bhp difference if you work the figures back to FW

[Carl]

Hi john,
What gear did you do the runs in on each of the rolling road\'s?What revs did you max out at?
Were both test\'s done with in an hour or so of each other on the same day?
Regards
Carl:)

[maximtaylor]

I agree Carl, more tests are required to come up with hub / roller figures.

Anyone else had there car on both types (Dynapack and Dyno Dynamics) for comparison?

[chris]

Max,
Can you put my results on the spreadsheet please
Owner: chris sense tuning
engine built by: sense tuning
Tuned by Reworx
Car FD
Street port 13b 2 hybrid 12a turbo\'s
RWHP 405 HP
Flywheel 481.3 HP
@ reworx 24/12/2004

[John Yorke]

Originally posted by Carl
Hi john,
What gear did you do the runs in on each of the rolling road\'s?What revs did you max out at?
Were both test\'s done with in an hour or so of each other on the same day?
Regards
Carl:)

Hi Carl

Both runs were in 3rd gear
Revs were more or less the same peak power was approx 7200 both power runs finished soon after that, no more than 8k
Both tests were within the same week, unfortunatly I have to work in between times;)
The car had the same fuel [Optimax]
Apart from having the dyno machines side by side I think that is about as close as you will get, as a comparison.
I think if you go through this rather long thread there are graphs to show all the details........................ :confused:

[Carl]

Originally posted by John Yorke
Hi Carl

Both runs were in 3rd gear
Revs were more or less the same peak power was approx 7200 both power runs finished soon after that, no more than 8k
Both tests were within the same week, unfortunatly I have to work in between times;)
The car had the same fuel [Optimax]
Apart from having the dyno machines side by side I think that is about as close as you will get, as a comparison.
I think if you go through this rather long thread there are graphs to show all the details........................ :confused:

Hi John,
Thanks for that,are you sure about the run being in 3rd gear at Abbey?I allways do them in 4th on the Dyno Hub.
Regards
Carl

[20B_boy]

Makes pretty much zero difference on the Dyno Dynamics - does it change much on the hub dyno then?

I remember Guy had an R32 on his dyno which was then taken to Abbey the same day - a similiar rollers/hub variance to that which John saw fwiw.

[88GT-R]

Hi,

Can you adjust the spreadsheat to read 348whp, taken in September 04 at AVB sports in Germany. Streetport tuned by myself. 352nm at the wheels.

John

[jonyb]

Had a good drive up to Thor at Warwick Saturday (2 April) with me local Jap car club.

Having run me motor in and already having a Dyno figure from Geff @ReWorx, was really for a day out and check up  to make all was ok.
Anyway, final figure turned out at 379hp on the hubs, was a little shocked as had been 323rwhp at Geff\'s.

Is this variance acceptable, i can understand that two different machines,different days, different operators and all that and i would always try to get to Reworx if i can.....dont know.

As far as engine and mods, both on the same spec. no changes between the two runs.

 .8 bar, a/f looked good and an \'interesting\' drive.

J.

[Carl]

Originally posted by jonyb
Had a good drive up to Thor at Warwick Saturday (2 April) with me local Jap car club.

Having run me motor in and already having a Dyno figure from Geff @ReWorx, was really for a day out and check up  to make all was ok.
Anyway, final figure turned out at 379hp on the hubs, was a little shocked as had been 323rwhp at Geff\'s.

Is this variance acceptable, i can understand that two different machines,different days, different operators and all that and i would always try to get to Reworx if i can.....dont know.

As far as engine and mods, both on the same spec. no changes between the two runs.

 .8 bar, a/f looked good and an \'interesting\' drive.

J.

Yes dynos do read differently.
I went to TDI the other day and the use a hub dyno,they reckon that there readings are 7% less than the one at Abbey.They are both different makes.
That is why I have said many many times that dyno\'s are only a tool to tune your car, and for consistancy in tuning you should try to use not only the same make of dyno but the exact same one if at all possible when making changes and tuning again.
All dyno figures should be taken with a pinch of salt.
Regards
Carl

[Carl]

Out of interest when I was tuning the other day we maxed the cars out to 170mph to put a good load on the engine.Not all dyno\'s can do that.Some are more limited in their speed.
Regards
Carl;)

[jonyb]

Originally posted by Carl
Out of interest when I was tuning the other day we maxed the cars out to 170mph to put a good load on the engine.Not all dyno\'s can do that.Some are more limited in their speed.
Regards
Carl;)

170mph.....fking hell, Thor got to 127mph in 4th and that was to much for me........ i stood outside, bit loud....

Understand on your comments for these things, im more bothered that its hp reliable side than big hp re-build time....

fast enough......for the minute, Rotorstock will tell :cool

[20B_boy]

Originally posted by Carl
Out of interest when I was tuning the other day we maxed the cars out to 170mph to put a good load on the engine. Not all dyno\'s can do that. Some are more limited in their speed.

Why did u do that Carl? is it hard to load cars up on the hub dyno then? cant think why you would need 170mph road speed to generate adequate load whilst tuning - or were u just testing out Dave\'s silly-big brakes? :rollin

[Carl]

Originally posted by jonyb
170mph.....fking hell, Thor got to 127mph in 4th and that was to much for me........ i stood outside, bit loud....

Understand on your comments for these things, im more bothered that its hp reliable side than big hp re-build time....

fast enough......for the minute, Rotorstock will tell :cool

Well your car should be reliable since it has been mapped at ReWorx.
The reason that we map to a high speed should be pretty obvious really,the car is not limited to only 120mph so the tuning should be done at the limits of the car and not the dyno whatever the hp you require.After all,how many people only drive their car to the redline in 3rd gear?especially on track days.

The dyno hub puts plenty of load on the engine but enables all of the gears to be properly tuned,if the engine is only tuned in 3rd gear then the turbo will come on boost differently from 4th and 5th and in those gears the tune may not be as safe,But I would have thought that any good tuner would know that.
Regards
Carl;)