I've put my dyno plot up in the rides section under paulb

 

Its the first time I've been on a dyno but it looks like it would have achieved higher than 230 if he hadn't done the test in auto and had it change gear. Shouldn't these plots just keep rising until they flatten at ~6000 rpm ? Any comments ?

I'm just trying to find reasons why I got relatively low results. Anyway, next time I'll be more aware of what to expect. I'd like to see other peoples plots to compare.

Hi Paul - nice to have met you on Saturday.

 

I think you're not the only one who was a bit disappointed with the results (the name Jeff springs to mind ).

 

When on the rollers, the car should have been kept in one gear (which is kinda hard to do with an auto box). Also, there is more hp loss through the transmission than with a manual transmission. AndyP mentioned a figure to me but I can't remember what it was (think it was something like 60hp but don't hold me to that).

 

Given that figure (60hp loss @ transmission) and the fact that you've got a completely standard car, that should equate to 230+60=290bhp at the flywheel - which is correct for a standard TT so I wouldn't worry too much

 

Anyway - lets see if some other people with auto transmissions put up their plots for comparison.

 

Cheers mate!

 

Danny

Yep, thats mucked up alright, it should go up steeply to a point, then start to taper off to a slower incline, that may fluctuate slightly up and down but stay level.....I'm afraid its not great, except to say the acceleration looks fine to the gear change so I'd expect your power curve to look OK.

 

Paul mate the plot for my auto had the dips in too, instead of a steady rising power line,and as I have said elsewhere the power runs not done in hold with overdrive off where flawed and not valid, the arse doing the test needs to learn how to test auto`s. Since posting my 1st complaint have spoken to 3 RR operators and they all have confirmed the problem we suffered and that the operator was at fault, so take it that your motor was not correctly done and the figure you have is good concidering that.

I think a RR day for auto`s only would be a good idea. (Oops look at that, now I`ve done it)

 

Jeff TT

Ps I just want to say again to clarify my position I enjoyed meeting you guys and Warren did an excellent job, the day was actually a great success, my moan was at the operators lack of enthusiasm only.

 

I can't post my torque chart because the server is arsing me around, but here is my bhp chart :-

 

 

This appears to have been run in 3rd with overdrive and TC definitely off. Not sure whether the guy knew about the hold feature on Jap boxes though.

Paul

Looking at your curve it seems that you have a lot more power 5000rpm and below than Warren's at the same rpm but his goes on to awesome levels. Does this also mean that the really hot motors lose out at the lower rpm numbers? I thought the modded ECU's could make sure you got the same driveability at low rpm as the stock unit.

Are we going to see more curves? I am interested to see what the differences are. On the auto transmission power loss I thought that in 3rd you are straight thru the box with no gears meshing and the clutch locked up so there should be no more transmission loss on a properly tested auto than on a manual also in 4th and straight thru the box. In 4th on an auto and 5th in a manual you introduce some gears and the losses they bring.

Willie

Just thought again - on WOT the lock up cluth on an auto lets go and you are probably back with torque converter losses?

Anyway

I saw a Scooby do rr day and they had around 70bhp lost in 4wd transmissions - thought a good 2wd transmission would be around 40bhp but it goes up with the rpm that full power comes in.

 

willio on my fist run i made 400 at 4000 rpm, but started getting detonation, i was running that at about 1.2 bar.

we need to establish how much boost each person was running, cause on my highest run was at 1.bar or 14 psi

i think my turbos contribute to the funny curves

Originally posted by 300z:

willio on my fist run i made 400 at 4000 rpm, but started getting detonation,

 

Have you thought about installing Aquamist?

http://www.aquamist.co.uk/

 

" aquamist is ERL's latest generation

of water-injection equipment.

The main function of these systems

is to suppress detonation caused by

high temperature and pressure developed

within the combustion chamber when

the effective compression ratio has

been taken beyond the auto-ignition point

by either a turbo or a supercharger.

Water, with its high latent heat content,

is extremely effective for controlling

not only the onset of detonation but also the

production of oxides of nitrogen in

the modern leanburn engines.

ERL's latest products are designed with

great care to ensure each system meets the

highest standards of both electronic and

mechanical reliability. "

 

 

The second MR2 that we dyno'd had an Aquamist system on it and we discovered that it was delivering a little too much. Actually got a higher reading by turing the system off. Of course, this is exactly what a session like this should be telling us. So maybe with the aquamist on a correctly setup it would be giving more than 200bhp !!

Any more plots to go up?

 

I wanna understand the logic behind the power! Warren has the force with him - love to know how you keep it without pistons and crankshafts doing the ballistic thing!

 

I'd also like to see the proof behind the Stillen chart in real examples.

 

Warren - If you use that power on the road does it give your back end some strain? I read mega power can cause the rear bushes to collapse and wheels to toe out big time.

 

Originally posted by WillieO:

Warren has the force with him - love to know how you keep it without pistons and crankshafts doing the ballistic thing!

 

Because my friend he has already had the pistons expire, so that will explain why he's getting away with it!

 

Coz he only had his engine rebuilt recently

 

 

I dont run my car at anywhere near that boost.

I honestly run it at .6 bar as that is still 320 at the wheels. I get wheel spin in third and sometimes 4th lol, depending on surface.

 

Despite what you hear the stock pistons and crank are good for over 500 bhp