Got the car serviced the other day and thought it would be best to get it checked on the rollers before i start doing loads of miles on it.

They ran it up on the rollers and it made 190@ the wheels with 14.5 psi, slightly down on boost so they turned it up a little and tried again.

It then made 196.5@ the wheels with 16.4 psi, its down 8.5bhp since last year which is due to the fact its 23deg outside and the car was on the rollers for 1 + 1/2 hours.

Looking at the old graph its very similar but just down a bit top end, the ACT is 7 deg up from the last time.





CLICK HERE FOR THE GRAPH

 

sweet mate very nice...

 

like it

 

well in mate is that in AVA if so i need to get mine up there for a good set up

 

very nice mate, how much roughly does it cost for dyno tunning??
cheers

 

how much that at flywheel?

 

Yes its AVA

 

Well done m8, still good power for that boost

 

Not bad at all mate, car's looking sweet as usual!

 

Ł60

They only measure at the wheels but ive been on a another rolling road and got 231 + 240@ fly on separate occasions

 

seriously?........does that include tunning if not any ideas on a cost and where abouts i can get it done in essex??
cheers

 

Essex you have got Engine Advantages, SCC are in St Albans, Or Power Engineering In Uxbridge Middlesex

 

Its the best money you can spend as it gives you peace of mind and also lets you see if there is any problems with the car

 

ditto, mines is going in next month, do they map there as well mate?

 

As far as im aware

Give them a call and ask

 

I did but i forgot to ask

 

Nice one Davie Healthy power for the boost your running

 

Good to see it's still going strong

 

What spec are you running if you don't mind me asking?

looks a clean car

 

engine advantages is Ł120 for a rolling road set up

 

do engine advantages have a web site? if not can i have the number please
cheers

 

1618cc CVH, stage 2 big valve head (ported and polished), Newman cam, solid lifters, piper vernier, wire ringed block, lowered compression(7.5:1), ARP conrod Bolts, heavy duty bearings, high pressure oil pump, AVA ecu, 7000rpm limiter, AVA modified fuel system, AVA high flow tubular manifold, T28 turbo, 360 bearing, reshaped cosworth front pipe, AVA Large capacity intercooler, samco water and boost hoses, magnecor leads, magnex exhaust, modified airbox, AP 4 paddle clutch

 

Engine Advantages - 01376 502522

very nice full credit to you

 

Aren't flywheel figures meant to be very misleading and unreliable compared to wheel figures?

 

I think the power @ wheels gives a better indication than at @ fly - more reliable anyway

Good figures for just over a bar of boost mate nice one!! Cars looking sweet!!!

 

 

That depends on whether the power@wheels figures compensate for air temp and pressure variables.

 

well done dave!

 

Sweet!

 

What possible explaination could there be for "fannying about with figures" or adding a "fudge factor" to compensate as you put it. Where power is measured @the wheels?

By compensating as you suggest. The only meaningful figure. Power @wheels would then become a mere guestimate along with projected @fly figs.

 

Well said but i havnt a clue what the both of you said

 

So, PAW is the be-all and end-all is it??

Are you not aware of pressure variations according to height above sea-level and runs that take place in different ambient temperature conditions?

Even at AVA's god-given RR, the weather is subject to variation.

 

This is getting a bit technical now

 

LOL. Not really, when you think about it.

Different heights above sea level mean different ambient pressure levels, this affects performance etc. Do some research on the Pikes Peak events and see what is said about the differences when the car is going through the ascent.

But, easier to understand is the climate differences. We all know how much better our cars are on cold days. Now carry this across to the Rolling Road. Modern RR software can compensate for differences in temperature and provide a reading that is more standardised.

Imagine running your car on a Rolling Road in Scotland in winter, then running it on EXACTLY the same Rolling Road but in Cornwall in summer. There is no way that the Power-at-wheels figures would agree!! How could they?

Make sense now??

 

no its not is always baltic

 

not really as ava doesnt move so if situated at the same level all the time plus there fan can be run to show the same ambient temps all year round
if you look at davies past 4 graphs theres only been a 10bhp difference at different times of the year
in summer there fans are pumping out that much cool air your actually feelin cold standing at the entrance,in winter there fans are not needed to do as much hard work,you will get some difference in temps in winter coz of the denser air
anyway rr figures are no good unless the car has been built and tested on the same rr which davies has so all in all he'll be a happy man,its an indication for him as to how well his engine is running and how it compares to other cars been rr one there rollers,and i would say thats good considering some of the allegedly 250-280bhp cars ive seen rr there that dont do what he's doin at the wheels,roll on winter again for the more exagerated bhp figures


also davie runs this boost all year round not just for rr shootouts

 

As above it is the only meaningful figure that can be measured with any degree of accuracy from any given Rolling Road. Surely you wouldnt dispute this fact?

I am aware of preassure differentials & variations in ambient air temperature. Again you appear to sujest that they can/should somehow be compensated for? .

Im not sure about the God-given Roling Road, but you are quite correct about the weather, very changable.

Ive had a good chat with Allan with regards the above, If you have any specific questions you want answered or any aspect your unclear of then he is more than happy to comment.

Maybee a 'nice power' 'cars looking well' comment would have been more appropriate, but NO! instead you appear to have a snide dig at AVA. Seriously Christian whats that all about?

 

Nice one davy , power-boost is great

 

Andy, in NO WAY was that a dig at AVA specifically. I just wanted to point out that while power at the wheels is in many way the most reliable figure, there are still variables involved and they are quite significant.

Every other RR apart from, it would appear, AVA's has the ability to compensate for pressure and temperature to an industry recognised standardisation. Take Dyno Dynamics for example, their system is intended so that you can run a car on any Dyno Dynamics Dyno anywhere in the world and produce a graph that makes some sense from a comparison point-of-view.

OK, sorry Dave for not saying anthing about the car, I have always had respect for your car as I like to see things done differently and yours certainly is! I just got side-tracked!

 

My understanding is that fans 'move' air not 'cool' it?!?

IMO theres no substitute for winter conditions.