Had my car on the rollers today for a power run. Results were not what I expected. (Not saying in a good way or bad way)

My spec is.....

2wd Saff.
Standard comp.
BD10s.
Double valve springs.
Ported & polished head.
803 injectors.
3 bar map sensor.
T34 .55 with 360 bearing and cut back blades.
4x4 intercooler.
22psi peak.
20psi held.

Car was rollered in 3rd gear. I always thought 4th was the gear to use?

Anyway your opinions and guesses please....

Ill post my results later.

Cheers, Ian.

 

id say about 320-330 ish but i know what power you got i know motorscope run 4x4s in 3rd for some reason and 2wds in 4th

 

the reason they use 4th gear is its closest to 1:1 ratio gearbox to engine

 

same as above.

you could easy go for a lot more boost,well enough so the greens don't max out

 

a true 330 bhp.


If it was dyno'd on a DD RR in dyno power mode, 3rd gear is correct.

 

360-370

 

320 - 340....

 

it was running more boost but it had to be turned down as it was running lean....

 

Had it peaking 26 and holding 20 and it was leaning at top end, plugs were white.

I want bigger injectors and more boost.

 

lawnsy beat me to it. ^^^^^^

 

well mine run today just before ian's....

comp around 7-0.1
grays t34
l&b bottom end
std head and cams
32psi

and it done 335.1bhp in a 3rd gear run and for some reson it would only get a 26psi boost spike.....i asked him to run it in 4th to try and get a higher boost spike but he said it would make no odds

 

If it werent hitting full boost, Then it wasn't loading the car up fully.

Which in turn will give a less bhp figure.

 

Should have made more than that surely

 

not realy bothered at the end of the day its what it goes like on the roads not the numbers.......

and i left 2 nice big black lines out of the ind est....

 

So did I, and some wiggly sideways type ones too.

 

Go on fella

 

everyboby will moan all day about R/R graphs.......................mine only held 25psi.......................made 420bhp......................."not on a standard head".....shock horror........................it holds 27/28psi on the road.................if it drives good.................fook the graph...........

 

Im only bothered that the fuelling etc is ok and its not going to melt.

Anyway it drives ok still, feels quick and is pretty responsive.

This is what I got.


The fella said they shut the throttle off when power starts to drop, but when he actually looked they were shutting off when the power was still climbing.

 

Did you get a AFR and boost plot too?

 

yip but for some reson the computer would not print that page so we have to call back for them

 

Make sure you get them mate, as gives important info for references.

 

Suprised it only made that

You had good torque, almost 350lb/ft

Maybe a 500 type intercooler might help a bit as well.

Steve.

 

i made 456bhp today at 25psi

 

What ACT's were you seeing?

did he fit the RR ACT sensor on your car?

 

Wheel or fly figure seems a bit low imo

 

Thats flywheel figure.

 

Boost plot and at the wheels figure.

 

DD rollers dont give ego boosting results, just look at the Results from the APT day. Thats why my car will run on DD once its in and mapped.

Good result Col Whats new then?

 

ive got a 500 cooler

 

Its only hitting 20psi, and drops to 17psi.

 

They use a lower gear as it pushes UP the power figure, due to lower speed at the wheels and lower friction between tyre and roller.
tabetha

 

A typical response when your claimed million bhp dont get proved on the rolling road. Remember all Cossies feel fast until you go in a fast one.

 

I was talking about BigErn's

Steve.

 

...........what do u mean..???...........i was happy as fook to get over 400 on my spec engine.........

 

Bloody hell BigErn G4 made nearly 40bhp more than that on a standard lump and turbo something must be a miss there

 

Lawnsys was well down on the boost on his graph too, wonder why??

 

MadRod I was there when Pete got 420bhp, its not a "claimed" figure.

 

RR road loadings is the issue.


BigErn, What ACT's are you seeing?

 

yeah but these cars are fast around corners too pal, not just in a straight line down an airfield

 

PMSL @ ESCYSCOTT