STi Time Attack 2008 - new dyno figures !!

duncan · Post by **duncan** » Sun Mar 09, 2008 5:33 pm

They may be a little optimistic on that boost to be honest, but comparative to before they are valid I believe.

I am getting it on gary's dyno on wednesday (with boost at 1.5 bar i hope)

rolty · Post by **rolty** » Sun Mar 09, 2008 5:54 pm

Not bad results at all Duncan!! I look forward to seeing the results of the runs at APT 8)

Listerofsmeg · Post by **Listerofsmeg** » Sun Mar 09, 2008 9:48 pm

so what weights were you actually using for the plots dunc?

ScoobieWRX · Post by **ScoobieWRX** » Sun Mar 09, 2008 10:28 pm

Your Dyno graph + losses i figure that you have about 448 BHP at the fly. I figured in about 21% for losses such as transmission, body Cd, tyre drag, average extra weight etc....

I'd be very interested to know how close your Delta dash gets to prediciting what the rolling road says. I'm using a spreadsheet at the mo which imports a log and works it all out from that so long as all the other car specific spec figures you put in are correct.

I bet Delta dash is conservative and you make more than it says.

Taking bets now between 450 and 500bhp at the fly

duncan · Post by **duncan** » Sun Mar 09, 2008 10:34 pm

As I said earlier, I think this is a little optimistic although I would love it to be true. It is fair to compare against earlier figures that showed at best 320 whp, so whatever happens it is 50 whp up

Weight is the thing that will affect the figures. I was using 1570kg for the car inc me, laptop and a chunky tool kit.

Gary's dyno is being used as a tuning tool (which they are rather good at) rather than a set of figures.

ScoobieWRX · Post by **ScoobieWRX** » Sun Mar 09, 2008 10:58 pm

You car in std guise weighs 1500Kg. I don't know how much lighter or heavier your car is now but i reckon you are being a bit conservative on the extra weight issue :lol: Therefore i reckon your dyno plot is going to be very conservative

I would have figured that average weight of 14st (89Kg) + c. 43Kgs for a full tank of fuel and another 20Kgs for odds and sods (baggy jeans, loose change and a can of Red Bull) you're about 80Kgs short on the Dyno.

I think you'll be pleasantly surprised :thumb:

duncan · Post by **duncan** » Thu Mar 13, 2008 6:31 am

Had it on the weighbridge last night.

Looks like I had taken more weight out of it than I thought.

Down to 1421 kg with a 1/4 tank. Good news as it is a net 100 kgs loss since this time last year.

but it does mean this road dyno is over optimistic. lol

We did have it on gary's dyno though and with boost set low to 1.3 bar (because it was erratic any higher than this) it made 438bhp.

It shows potential if I can get it under control and can run it at higher boost but at present there is too much of a boost spike when running up from low revs to make it feel very nice or look pretty on the dyno. Lots more work to do on the map

ScoobieWRX · Post by **ScoobieWRX** » Thu Mar 13, 2008 6:48 am

Your delta dash doesn't seem a million miles away though...that's good. At least you get a rough idea from it

duncan · Post by **duncan** » Thu Mar 13, 2008 6:50 am

with me and laptop/toolkit and 1/2 tank the weight would be 1530 kg - so on that basis I think DD would come up with the same figures as gary's dyno give or take 5 bhp

ScoobieWRX · Post by **ScoobieWRX** » Thu Mar 13, 2008 6:51 am

:thumb: