I have just been outside looking into why my turbo is boosting later then before and why i have a very flat torque curve. I took the variator relay out and the pins in the connector have oxidized and gone really black.
I gave it a quick clean and pushed the relay in firmly. Just been out to fill it up and wow what a difference, boost in hard at 2800 (1.37bar) and it feels so much more responsive and faster.
Shame i didn't notice this before going on the rollers. Will clean the connector up properly tomorrow and give it a better test (got a 300mile round trip to do tomorrow).

looks like my variator wasn't doing anything today on the rollers

Ash

Thats good news Ash

Its typical we find these little niggles out after the event

Ben

i know, i think that's what owning a coupe is all about, the little niggles.
I was very impressed with your engine bay, could eat my dinner off it

Ash

Geees, I feel tired after today! Some nice results, especially glad to see Nigel and Luke's power back up, Ash making a good increase and Dan's standard car doing the business

Not sure what to say about mine as it didn't quite get a full set of results. First few runs at 1.9bar were done in 5th gear, but for some reason the dyno was limiting the speed to 150mph and shutting down the run, just as it was getting going!! Unfotunatey 4th gear was spinning the wheels on the rollers so never got a proper run at full boost. Anyway pleased with the results, certainly backs up what I have felt on the road

1.9bar - 403lbs/ft
(run aborted at 150mph in 5th gear)

1.7bar - 457bhp & 369lbs/ft
(4th gear run)

150mph = topped out Dyno. 5th gear?

Anyway, nice figures Leighton.

damn, that's some power, I want !

Flea - I thought you said that Rich ran in 5th for my runs - I've checked the graph for the final 388bhp run and it shows 129mph at peak power, so it must have been in 4th

WOW! So much torque How much WHP Flea?

Nigel, yes he did use 5th on the first run, but I asked him to run it in 4th gear after that.

Matty, most dynos with twin rollers per axle do limit the max speed at which the dyno can run due to the smaller bearings. Something like the Dastek or Dynojet which has big single rollers can take a little more top speed due to the larger bearings although they don't recommend it. It appears the MAHA limits top speed to 250km/h or 155mph.

It's a shame we couldn't stop the wheels spinning in 4th gear, perhaps with a little more time and effort it could be strapped down harder. He tried reducing the load on the dyno so that it would allow it to spin up quicker but the wheels were still breaking free. It also has the effect of reducing boost as it doesn't load the engine enough. I have to admit my tyres are also shot, so that didn't help matters.

Nice Flea

Same question here Flea.. how much wheel Hp and Tq?

best run made 340bhp and 297lbs at 1.5bar but have quite a bad bouncing idle atm and nigel suffered this before and was found to be boost leaks so im suspecting i may have boost leak somewhere the search continues

relly sorry i didnt turn up guys my car bokedown on the m4 engine management came on and injector light had to wait for my fater to bring a trailer proper pissed off really wanted to see how the fueling was doing on my coupe as i can see you all had some very good results may be next time for me cheers


Richie

I don't understand why you couldn’t get a proper run in 5th I though MAHA dynos were good , you gonna take a trip to PT for a power run then

I think it’s fair to disregard your 4th gear runs as "official" as not getting traction is a B***h.

What RPM were you reaching before it kicked out? Obviously you reached peak torque at 403ft/lb at 1.9Bar I was kinda expecting more considering you got a GT3076R. But now we are all left wondering what the BHP would have been....

So the question is when is the next power run?

Er, read above. I don't think you will find many dyno operators wanting to run cars up to 190mph+ especially with eddy current retarders.



The 4th gear run at 1.7bar was fine for traction. The 5th gear run didn't slip so the torque figure is at the point it stopped on the dyno. Based on the 5 speed gearing it would have stopped at 6150rpm, so another 1700rpm to go.



Why? Based on...? All cars on the day made power expected for their level of tune. It begs the question, still think you would make over 400bhp at Powerstation, indeed even the same as your "PT figures" ? Over time I may manage to squeeze a little more out of it but right now, it is what it is.

I though you said it was slipping in fourth So you’re happy to say at 1.7Bar its 457BHP with 369ft/lb what was wbhp?




Based on your dyno graph here:
http://www.torquestats.com/static/cars/modified/Flea/20/upload_274.jpg?1206008769

Was this not your last official dyno figure at 1.6Bar with GT2871R 0.86 and PT map?
It made 480BHP with 366ft/lb.
Now you make 457BHP with 369ft/lb at 1.7Bar with GT3076R and your map.
That’s why is was expecting more power.

Here is my graph fom the day click

And a few pic's

luke
mine
owl10
carphone
ash
nick_d
flea
mattm
nigel

Ben

You'll also find most Dyno's top out around 150mph which is why I did a face at the 5th gear run.

Now thats what i'm talking about, turn the limit off and 200MPH.

Have you tried going past 150mph on your dyno Matty? I'm sure I have done it on my local Dastek last year but he wasn't keen for me to try.

Jason it's hard for me to compare the two setups as a couple of months later after that run my engine blew up on PTs dyno... On that day that's what it made at Powerstation. It was much colder, the engine was running a good deal leaner at the top end and the ignition timing was somewhat more aggressive than what I run now. The turbo was a TD hybrid, not an off the shelf GT2871R 0.86, in fact it does appear to flow very similar to my current turbo so who knows.

Anyway enough about me, if I get any more dyno runs I'm sure you will be the first to criticise... sorry question

I see the story unravels more..., I heard that it let go at PT but didn't want to say publically. No 4 plug melted and dropped in or something?



Agreeded I just love the sparing matches, I like keeping you on your toes

Actually it was more than that. They were CP forged pistons, number 4 ran so hot the ceramic tip on the iridium plug dropped off and went all the way through. However, all 5 pistons had severe detonation pitting, indeed on number 5 part of the piston crown had broken off at the edge. This was a brand new engine with about 3000 miles on it including running in.

The reason I didn't go public, especially at the time, is due to the blame game. PT said it was Barbz and Barbz was adamant it was the mapping. Barbz and I have been good friends for a few years now, and at the time I didn't think it was fair for anyone to question his engine builds so I took it on the chin.

I should point out that upon stripping the engine there were no problems, oh other than the destroyed pistons.

TurboJ, has Leighton upset you in the past? Seems you have a chip on your shoulder for some reason???

Just a bit awkward to read your posts... They dont seem to be motivated by genuine interest...

Regards

Dan

Not at all. Flea's a nice bloke I aint got a problem with him at all. Just because we don't agree on all issues doesn’t mean I have a chip. I will always challenge something I don't agree with and have never bad mouthed his work, I know flea is good at what he does. Disagreement and arguing points doesn’t mean negativity towards each other. The way some of my posts read may seem awkward but I was never good at English in skool.

Anyway enough of me an Flea where are all the graphs

Great to see the results from this dyno day at last; been waiting for this for a long time.

Nigel's making 400bhp again, Luke's car now making a 'reliable' 338bhp and a standard remappe car making 259bhp... more than I ran for 4 years with fairly extensive mods All good stuff

As for the top speed on the rollers thing, when I took mine to Track'n'road, the guy did my run in 5th gear and took it up to 6,500rpm or thereabouts, well over 150mph anyway. He told me he always runs them in top gear and even showed me a vid of an F1 car redlining in 6th gear. It was near 250mph apparently... sounded like it too

Good old Greenald

Jason,

just to add, I physically looked at Leightons pistons after the carnage on the rr'd at PT, they were all truly fccuked & detted to death.

I would have mistaken them all for a dart board judging by the erosion on the crowns & amount of heat damage

I have also suffered with the PT map, sure on the day it was okish, but I will NEVER use them again.

Put it this way, if Flea didn't map my coop, I would have quietly had it crushed, and I am NOT joking about that

when you are sat in the MOT station & the CO emissions are getting above 10%, YOU HAVE TO QUESTIONS what the fccuk is going on

IMHO

Sad to hear that about flea's engine I wouldn't wish that upon anybody When Barbz told me what happened years back I was devastated for him as I remember once upon a time when the DTA ECU trashed my first engine. Glad to hear yours is up and running sweet

My last run on the rollers was at Owen Developments. He, (Mark Harrison), ran my car in fifth aswell and max power was reached at 167 MPH.

Sean

If we can all stop this bicuring and get back to what this thread is about

And any more results from the day

Ben

290 lb/ft & 320 bhp....ish

rich lower down and getting lean toward the top, no prizes for guessing where it was mapped (wasnt cheap either)

another coupe going to be heading leightons way soon, well as soon as you lot work hard enough for the govt. (aka my student finance) to pay for it........