Dyno sheets and discussion for UK Rotaries!

[bnaellis]

Formula for calculating Flywheel Horsepower:

Drivetrain loss on an FD RX-7 is about 18%. Therefore take 18 from 100, and you get 82. Then take the rear wheel horsepower figure and divide it by 0.82.

e.g. 217rwhp / 0.82 = 265fwhp


RGDS

[Gman]

Ah 286.5 HP at the flywheel then.

[J4P RX]

OK I went today and got them to print my graph from record.  Run was done on 21/7/03 @ CPL Dyno Dynamics.

274 @ Wheels

HKS Air Filters
Knightsports ECU
Racing Beat Exhaust
HKS Hard Pipe Kit

Cheers
Lee

[Gman]

Thats pretty s**t hot Lee, well done.

[J4P RX]

Yeah, for whats on the car its very good but I knew this as  it does shift.  Thing is I have now seen the graph, and its not particularly good.

I have a dip where the 2nd turbo comes on, and then between 5000 rpm and 5500 rpm I go from 170 ATW to 255 ATW which seems pretty steepfor 500rpm.  This may explain why in the wet I can just light it up in 3rd on the 2nd turbo.  I suppose this is a good thing though, better to have the power there.

Trouble is right after my power actually drops by about 10, before gradually rising up to the 274 ATW then tailing off after about 6500.  Now Im just wonder what it would be like if the end of my power graph was smooth and not the mess it looks on paper.  Should be a fair bit to come.  I think ill leave it pretty much as is though.  No point in getting a Power FC for the small gain if any and I dont like them.

Cheers
Lee

[iaint]

I wonder if there\'s any chance that the weird look of the graph is wheel-slip related?  I assume it was on rollers?

Iain

[bnaellis]

Hi Lee,

What boost was that dyno\'d at ?? I guess numbers are  high for the mods mainly to do with the fact when it was dyno\'d  it had a freshly built engine ?

rgds

[J4P RX]

Pretty sure its not wheelspin Iain.  Dyno Dynamics have a good repuatiton for not having problems with it.  You really can feel the 2nd turbo kick in so I believe the graph.

Brian, I guess it may well be because that was dynoed on a new engine.  It is running 1bar boost though.  Pretty high.  Im doing a dyno day in Crawley next month (just power run) so it will be interesting to see how it compares.

Cheers
Lee

[bnaellis]

What company is this with and what day I may be free so will pop down and maybe contcat then to stick something on the dyno myself.

rgds

[J4P RX]

Brian,

The day next month I am doing is at Austec Racing in Crawley.

http://www.austec.co.uk/

Its basically just a club dyno day with the SXOC, ut as I live there it would have been rude not to go!

Places are full, however I asked for two spaces - one for me and one for my mate Ben with his FD.  He will have an Apexi fitted and mapped by then though as he needs it to sort the car, so chances are he wont be bothered about the power run as he would get a figure from mapping the Apexi.

Ill ask him if he still wants this space bearing in mind the above.  Its MArch the 20th, and its £35.  Its only the normal club day power runs though, and not mapping etc.

Cheers
Lee

[bnaellis]

bugger i\'m away that day.
There close to my premises though so I suspect I\'ll be popping by sometime soon.

rgds

[Robertio]

I guess I\'ll just put the best for each venue:

Robbie Calder
Carl Hayward
Max / Me
282fly 214rwhp 242lb/ft
Star Performance - MAHA
16 Nov 2003

Robbie Calder
Carl Hayward
Max/Me
312fly 260rwhp 254lb/ft (actual figs higher, these from 500rpm increment)
Dastek Dynometer
17 Jan 2004

[jay]

21.2.2004
CPL Racing
241 rwhp
runnin 0.8 bar and mapped by Geff@Reworx...

Standard engine 32000 miles
Blitz front mount
HKS filters
de-cat
Apexi Exhaust
Sard Bov
Apexi Power FC


Cheers Jay...:wave

[J4P RX]

Just bumping this so someone updates the table.

Cheers
Lee

[Gman]

Who can update the table?