Japerformance Ellon

[jcscoob]

No probs mate[y] I dont think he will he is looking for consistency as much as you are []

[andrew_forrest]

 

One thing you can say about modern dynos is that they are generally very consistent. But I guess you knew most of this already.

 

No, I didn't know that. Would that explain how a certain Sti8 got 400+ at Dastek and circa 370 at WP ?

Nor will they tell you how fast your car will be on the street/track. Currently the UK's fastest std internals 2.0 Subaru on the 1/4m shows only 340bhp on a DD RR Similar cars showing 420+ however are running slower times and mph.

Not a Dastek unit but recently I was mapping some cars on a customers rolling road (against my better judgement) and one car lost 15 bhp after sitting overnight unaltered

You certainly can't compare DD rolling roads in different locations (or is that different operators) so I don't expect a dastek operated in different hands to be any different.

For some light reading - http://www.andyforrestperformance.co.uk/26063.html

Andy

[craig mac]

Thanks, I didn't think you were. I agree there doesn't seem to be any consistency between these dynos right now. Guess people should just keep going to the same dyno. No real way of measuring improvements otherwise. I hope when Craig has run this week that we can at least say that Dastek UK and our dynos are comparable! They should be.(hopefully he'll not move the goalposts with different fuel etc!)

[]

One thing Jap did was uped my tyre pressure to 50 psi b4 the run? what is that about?

Craig

[AlanG]

One thing Jap did was uped my tyre pressure to 50 psi b4 the run? what is that about?

Craig

 

Minimise tyre distortion on the rollers which can affect readings.

[craig mac]

We hope that the Playsatan2 is coming on Sunday (come on Colin you know you want too)[][]

Want to see that one eat some cars of the Dark Side

Craig

[rossyboy1]

Carl, I remember the fridge V1 very well and followed the story with great interest []

My car actually hit 1.5 bar peak [6] on the rollers, so there certainly isn't an issue there. I think Simon's words were "holy shit" when the boost pressure was off the graph on the printout []

I too expected more and I think I will try wp to satisfy my curiosity. Like I said though, the difference on the road from 1.2 to 1.45 is marked to say the least. I'm starting to agree with those above that RRs are irrelevant []

 

[Russs]

 

One thing you can say about modern dynos is that they are generally very consistent. But I guess you knew most of this already.

 

No, I didn't know that. Would that explain how a certain Sti8 got 400+ at Dastek and circa 370 at WP ?

Nor will they tell you how fast your car will be on the street/track. Currently the UK's fastest std internals 2.0 Subaru on the 1/4m shows only 340bhp on a DD RR Similar cars showing 420+ however are running slower times and mph.

Not a Dastek unit but recently I was mapping some cars on a customers rolling road (against my better judgement) and one car lost 15 bhp after sitting overnight unaltered

You certainly can't compare DD rolling roads in different locations (or is that different operators) so I don't expect a dastek operated in different hands to be any different.

For some light reading - http://www.andyforrestperformance.co.uk/26063.html

Andy

 

Sorry Andy, the key word was meant to be "modern". Perhaps I should've made that clearer. You won't argue that chassis dynos have come on leaps and bounds.

Been over this before, but the STI8 you are talking about made 400bhp at Dastek UK when Gerry has admittted there was a minor issue with the dyno, but I guess you knew that. Ask Chris, we made every effort possible here to make that car make more power....

I don't have any real expectation from comparing dynos figures, just hope. I think it will be interesting to try. Happy to report back either way.

Interesting point about the car sitting overnight and losing 15bhp. When we do the 1st run on a car, with engine up to temp, but not  transmission up to temp, there is always less power at wheels. You can probably see this from some of saturdays graphs. Obviously the 2nd run sees more at wheels, but pretty much the same at flywheel, because the Dastek dyno calculates the losses. Wouldn't be the same on a dyno dynamics machine, and may well explain what you've seen.

I am sure you know all this really, but not everyone here does.

Besides, you are almost not disagreeing with me on some points, I must be making some sense!

 

[andrew_forrest]

I was unaware that the reason for the Sti 8 discrepancy had been established.

I was indeed talking about a DD RR regarding the 15bhp overnight loss, this was to highlight just one good reason not to try and compare different rollers. One positive (ish) point about the DD is that the ramp rate is locked when in shoot 44 mode and that limits the duration of the run to a short and sensible level.

Once you start to play with acceleration rates, it is all too easy to overcook and damage a high powered engine on the rolling road, as I'm sure you are aware.

Andy

[Boyakasha]

Sorry Andy, the key word was meant to be "modern". Perhaps I should've made that clearer. You won't argue that chassis dynos have come on leaps and bounds.

Been over this before, but the STI8 you are talking about made 400bhp at Dastek UK when Gerry has admittted there was a minor issue with the dyno, but I guess you knew that. Ask Chris, we made every effort possible here to make that car make more power....

I don't have any real expectation from comparing dynos figures, just hope. I think it will be interesting to try. Happy to report back either way.

Interesting point about the car sitting overnight and losing 15bhp. When we do the 1st run on a car, with engine up to temp, but not  transmission up to temp, there is always less power at wheels. You can probably see this from some of saturdays graphs. Obviously the 2nd run sees more at wheels, but pretty much the same at flywheel, because the Dastek dyno calculates the losses. Wouldn't be the same on a dyno dynamics machine, and may well explain what you've seen.

I am sure you know all this really, but not everyone here does.

Besides, you are almost not disagreeing with me on some points, I must be making some sense!

Russs I'll have to agree with you mate, with the exact same mods on my car it made about 370bhp, so I was shocked when Chris told me he made just over 400bhp, however when the car was RR at WP then I realised there must have been a problem at Dastek on the day.

As Andy has said before it is how the car performs on the road that really counts so sometime RR Figures don't tell the whole story.

Anyway Russs I'll need to swing by and say hello as I haven't seen you in ages.

 

Marc

[Russs]

Thanks Marc, be good to catch up []

If you remember, there was a real fuss at the time about how if you wanted 400bhp you go to one mapper, if you wanted 370bhp you go somewhere else......[:|]

Bet those people (who should've known better!) don't come forward and apologise now [:@]

[andrew_forrest]

  As Andy has said before it is how the car performs on the road that really counts so sometime RR Figures don't tell the whole story.

 Marc

I couldn't agree more Marc, it's too easy to get hung up on the peak numbers...... but hey, thats what sells dyno time

 

Andy