Dexter, have a read of http://jcdperformance.free.fr/powerdyn_me_uk.htm

Basically, the software takes the rev counter input signal, via the recording hardware, and uses the time taken to accelerate the car (a known mass) works out the force required to do the accelerating at that speed, and then uses the wheel diameter and a few other things to calculate the power of the engine. All the hardware does is take the rev counter signal down to a low enough level that a microphone recording device can register and safely record it

Well we're a bit shocked but here's my results, less than the frenchy power

I don't think that's anything shocking - the 1.7 readings are wrong for a start - theres no way in hell that the 1.7 produces peak of 108bhp. Especially as it has 170k miles

EDIT: It all makes sense now Chris has admitted to purchasing some power resistors of justice!

I really don't understand it, I reckon my last spike is an anomoly, so you are higher than me, but I should be lower. What I don't understand is we are using the same setup, apart from weight (which I should be disadvantaged in, as I was carrying a couple of sheets of MDF and a blueline interior at the time, and didn't factor in) and different wheel sizes. I'm gonna try for another run...

EDIT: Forgot to mention, since I played with my carb yesterday, I swaer I have more low end, maybe I should do another run

yeah, the last upturn in the bhp wave on Chris's is an anomaly. TBH those look about right. apart from that Chris's are artificially high. MAybe a weight parameter issue (not knowing at all how this software works)

Right, I've just done another couple of runs, and I still don't get it, I'm still registering high. My weight is against me (higher weight than you are would put your power up, I'm currently carrying a second interior, and a couple of sheets of mdf, and I havn't booked enough for them, Fake is 1002kg, I'm 60kg, and I've entered 1100 into the box, which also has tools and stuff in boot)

I reckon, and this is purely a guess, that me and Jani are over reading by a bit (in the drivetrain loss figure) and Ali's LE jet isn't fuelling correctly for teh V cam, which has dropped you some horses. I can't think of anything else at the mo.

Anyway, here is new comparison

I have mono plug and I hook it to my laptop, I can also start special funtion in powerdyn that makes recording and analyzing right when I drive.

This is one of my recordings, only modification to it is that I cut it to contain only that acceleration part.

http://www.janiervast.com/projekti/tied ... ynorun.wav

I made little testing and it could be that 12% transmission lost would be much better with this program, again depends from car, mileage, transmission oils, etc.

I have one profile created where I have set transmission loss to 0%, that way you get wheel power, not engine power.

You should eliminate all weird sounds from getting to recording as program just reads spikes and then analyzes rpm and acceleration (rpm change) from those spikes vs time, so if you get some extra spikes there it will go bit crazy

But open that my wave file, you should get pretty same. As you can see I had something wrong with renix as signal strength is not even.

In powerdyn you have this icon gauge with needle, it sits between sound card and .wav or .txt file drop down boxes.
It is useful as you can open your wav file to it and then watch how rpms are read by program, also you can adjust parameters to try to get better result.
When I'm driving with laptop I can get that tacho to show realtime rpm, it also shows if there is some weird jumps.

One error I have got sometimes has been when I saved file to wrong format, I could not get anything decent out from it then.

I use wave unsigned 8 bit format, that is at least what goldwave reports.

1,7l engine should be below 90hp in any circumstances, but really can't think of what would be wrong.

Ali wrote:it gives silly figures (15000bhp at 9000rpm anyone?)

Dude! You hit tha VTAK!

I think the wobble in the top end of your power curve is LE-Jet not being able to fuel properly for the V cam. We'd need to measure that with a wideband lambda sensor to be sure, but I bet it's running a shade lean there, taking the edge off your top end power. Since I recommended it, that'd be my bad...
...but at least it (probably) tells us that LE-Jet can't fuel for a non-standard engine configuration.

cheers

James

Make's sense and Ali did say he couldn't tell any difference, explains why my saloon with plastic bits weighing it down can keep up...

Yeah im peaking at 5200rpm and about 10bhp down, should me more like 5700rpm according to carfolio.com but the torque is spot on

Not sure if yours is high or low compression on a D plate Ali. Low compression B200Es were 111bhp, if I remember correctly. We should swap LH2.4 management onto that thing...you'll get better MPG, better starting, and it'll fuel for that cam properly.

I'll understand if you wait for me to do that on mine first though, since your car has already been the guinea pig once

cheers

James

Yeah mine is the low compression one, i'm going to go out later and grab some other tests, i'll try with stock air filter and my ricer induction kit too, I think i'll wait for you to do that LH2.4 first James
cheers
Ali

Foggy I'm not sure that would work, cos LH2.4 will still run open loop at full chat since it doesn't have the Lambda capacity to run a closed loop at 12.5-13 AFRs, and it would surely be setup for a 2.3 litre which is going to be different to a B200E.

I wonder whether is worth just modding the air flow meter to provide slightly more fuel throughout the curve, sacrificing fuel economy just a tad to provide more power at full chat high RPMs.

Only other way I can see without totally modding the LE-Jet circuit - which is in theory possible once you know which resistors/capacitors to change- is to go for MS.

Right then well I only managed to grab limited runs as my dad was getting sick of the noise sat in the passenger seat! First two are with standard airbox and trim in, second two are with free flow filter and rear seats removed, quite a big difference!






edit: now i've found out how to do averages this is a comparrison