It's more of a blower then a fan, a different concept to the big caged fan used at SRR. Certainly very noisey and certainly shifts some air.
When the car went on the rollers it was soaking wet as it was raining outside.
As soon as the blower came on the water just flew off quite dramatically, I would say equivelent to doing 80-100mph. The water certainly cleared alot quicker then it does when driving at 60mph.

Again this looked very similar to what PE used to use. The more I think about it the more it seems possible that it is PE's old equipment.
The last time I looked into/read about PE I think they were moving premises and investing in new equipment.

I should of really asked Chris, I will try to next time I see him.

250(ish) seemed to be the figure most UK with decat seemed to hit with a decat and filter, back in the day when 300 was the thing of dreams.

IIRC my old classic recorded 309BHP at PE, with a bit of map tweak with a bit leaning out and a touch more boost (about 0.1bar) it hit 314BHP at SRR the1st time I went up there.

2 Runs, 2 plots at 2 different RR settings

338.2BHP / 326.5lbft
http://img.photobucket.com/albums/v90/Scott.T/RR2.jpg

337.8BHP / 323.8lbft
http://img.photobucket.com/albums/v90/Scott.T/RR1.jpg

As mentioned above I logged a few runs out on the road.
putting these into the road Dyno supplied with the logging application gives very similar results to the above.

Normally road dyno's are very subjective and dependant on the parameters entered i.e you can tweak them to give the figure you want to see.
I initially thought the road dyno was coming in about 30BHP down on the above with the default settings for the STi. 'BUT' found that the 2005-2007 STi has a different final Drive ratio to the earlier 6-Speeds. Once this was entered correctley the values from the Road Dyno are very close to the Rolling Road.

I will post the Road dyno plots later

Nice going Scott, it looks like you have found a bit of a gem there :ok:

Sorry but if you turned up with a mapped car he would have no idea what settings to use, if someone were mapping on such a dyno they can trn it down run the car and then map it and turn it up. Which is why dyno dynamics works far better as you know or any operator knows to run a 4x4 car is shoot44 mode. The only variables are the air and intake temps and barometric pressure, which if far out it is obvious and they are print on the dyno dynamics printout and how the car is strapped.

Maha measure the drive train losses but reproduce the at the wheels figures from some strange calc that makes them meaningless. Yes it records the actual losses however if the brakes are binding the tiniest amount it is recorded and massively skews the results.

The dyno dynamics uses 22% losses iirc and although one could argue this is less accurate it is consistent and the variance between operators less.

They often read higher than dyno dynamics as does power engineerings old rollers which is now owned by ecutek and has a temp controlled sound proofed cell for development work now.

It would be interesting to compare data from there but the fact there is no standard settings worries me. Maybe a cheap way to gain power though. Worzel best be ready to order more numbers for the back of the car ;) :d

Simon

Oi, I resemble that remark :fight: :lol:

Another reason I didn't get Angers turbo in the end, getting fed up with giving Halfrauds all that money for new numbers :wink:

It would be interesting if you were to check it out personally Simon if you were down that way? Because a couple of your comments mean he could benefit from putting in the right direction?

As stated before, I will keep going to Charlie, I love the abuse, red hot pizza, arse killing curries and the bog of doom too much to move away :ok:

I wonder if there is a similar mode for the MAHA.
From this I read that when you map on the rollers you use a different setting to when you do a shoot out, is that correct ? and what are the reasons ?

I may try and get a manual for the MAHA, as you appear to be able to download from their website once registered.

+1. SRR not too far for me either!

Interesting reading this thread.
Always a good debate to be had on rolling roads :-)

I always took my cars to power engineering, reason being they were well renowned in the cossie days. Remember getting a -31 actuator and an Ahmed bajoo chip for my saph. It made 280bhp and I was so impressed, how things have moved on :-)

The prototype is soon to have a RCM decat and then will be booked into SRR with Simon and Charlie.
My classic has not missed a beat since JGM mapped it:-)

Had forgoton just how suffocated a scoob feels with the cats in place . Not pleasant .

[QUOTE Had forgoton just how suffocated a scoob feels with the cats in place . Not pleasant .[/QUOTE]


Tell me about it :cry:

no mate.. there are varying modes you can use on the dyno dynamics and various loads but not in a shoot44 pull etc..

I normally map in shoot44.. I dont like holding turbo cars at a load point as the heat is very quick to build. Do so occasionally to fault find or if in particular there would appear to be something to be gained playing with vvt settings for example but have to be very careful with heat.

what I meant was and I wasnt insinuating they were in st leonards as they dont map but you can alter the before and after by applying different calibration settings on the maha.

very much looking forward to seeing that car ;)

I still think your other classic is the best well looked after original early car I have seen in a long long while

Yeh agree that could easily be done and is probably done at some venues.
I saw the direct result of that when the rollers were set to a load of 70. Power rose to near 350BHP.
It was at that point I said nah!!! somethings not right there, we dropped it to 40, recorded 338, then dropped it a further to 30 and still recorded 337, so settled on that as the decrease had made very little difference.

He was told by the person he bought the RR off that low power 2WD should be on a low setting and higher power cars a higher setting.
The load is used not only to calculate the torque required to spin the rollers but to try and maintain a linear increase in rev/power and prevent the car running through the rev range too fast.

This is my Road Dyno ATW plot taken from a log 15 mins after the RR run.
No tweaking to the parameters have been made other then ensuring the correct gear ratio's, weight and wheel/tyre combination.

The road dyno gives a Power Figure of 243BHP, the Rolling road plot a ATW power figure of approx 255BHP, so not a million mile away.

http://img.photobucket.com/albums/v9...t.T/PPPStd.jpg

Charlie is da man
SSR rocks

Jgm roooooocks

This Is an awesome thread.
The only way to be confident is have as large a number of cars do runs at both sites ant compare the deviations . its a simple standards deviation analysis . Bell curve and all that. simples

Scott do you have any pricing info just for a power run? Pm if u want

Cheers mate

How do you know its a high power car or how high powered before you run it?

If 40 load or what ever it was seems correct for your car for example and we all turn up for a powerrun, others with 400+ are going to over read?

I dont think there is the same setting on the maha.

Dastek takes a reading at a set rpm and load and measures the gearing at that point and seems fairly accurate.

Simon

This is such a minefield by the look of things.

I never though of Charlie as some kind of boffin before, but maybe I should!

Charlie = :ugeek:

It would be interesting to take one car to SRR first, then drive straight down to Chris Langleys and see what (if any) the difference is with the same car.

My guess is you do a couple of runs. From some small info I have managed to google, it may be that on the MAHA the run through the revs has to be within a certain time window i.e 90 seconds from start to finish (+/- a tolerance). The load applied either speeds up the run or slows it down.

The above would have to be performed, I assume too low a load will cause under-reading as the car will accelerate through the rev range too fast.

agree it does look like that

The only reading done on this MAHA is at 25mph (I think) in the gear selected for the run, to determine ratios'


I know there are alot of pro's and con's you only have to google MAHA Vs Dastek or Dynojet or dyno dynamics to see a whole host or forum discussions.

MAHA are though used by a number of German car manufacturers, so shouldn't be written off as being not up to the job.

Never been to a RR session. Got no idea of the power of my car, No idea what i should be looking for in an operator. Wouldn't know if he has being stupid, damaging my car, risking my engine. This makes good reading. Would like to go to a RR meet with others from here so they can tell me if I'm having my pants pulled down.

That's why you go to SRR with JGM

Yes you should , there's more than just strapping a car to the dyno !
On the how clean the place is, i've been on holiday for the last two weeks and popped up to get me engine hoist from the famous back passage and can say someone has been very busy there cleaning (at a guess charlies other half). The loo was never charlies it was a site loo for anyone to use , it now is and is for SSR customers only .Its now very clean and i'm sure it will stay that way now if you lot can aim !

does this mean that Charlie is the man to go to?

Yep.........

it was loverly!:grin:

Chris, in fairness, the Boffin bit about Charlie was a little tongue in cheek, I know he's fookin good at what he does and that theres more to it than just strapping one on (so to speak :cath: ). It's why the vast majority of people go to Charlie :ok:

Pristine bogs hey :zoiks:

Blinding news on the bogs though, you see lads, a bit of well directed "forum bitching" does have the very occasional good effect!

I'm looking forward to using the facilities in the near future.

Someone at work went to get a power run at St. Leonards.

Apparently they bought the kit from a rolling road at Alfriston by Drusilla's roundabout. He went in there afterwards after hearing about them at Alfriston and he said they had sold it on.

Think as has been said above they are new to it in St. Leonards, but by the sounds of it the numbers are about right if you have a mapper or someone with you that knows how things should be set up.

Nice to have options.

how, where do i find Charlie?

thanks C.J