From Saturdays dyno day.

@10psi
M2 Stage3:

Pettit:


Pettit @13psi:


This is a DimSport dyno, without retarder/brake. Similar to dynojet.

After I put in HKS TP, I'm going back to make another run @13psi.

 

Looks like the M2 and the Pettit are about the same. I have always guessed that would be the case.

Did you cool down the intercooler between runs? Looks like heat soak has significantly effected the last run.

 

Interesting, why does the graph stop at 6700 rpm?

 

I am just guessing its an auto since it says 4 speed and 3.9 gear ratio.

 

Nah... the operator didnt calibrate it correctly (it uses aproximation of revs - doesnt pick them from the coil).
At around 6900RPM it should be actually around 7500RPM, where I left off, as I wasnt making any power anymore.

There was about 5-10mins between runs with big vent in front of the car blowing into IC (also had opened hood).

Last measurement was strictly ignition related. If youoverlay both printouts from 10 and 13psi, the latter has much better power up to ignition breakup.

It also seems that these measurements are normalised/averaged, as ignition breakup usually shows as small jumps in the power curve.

 

Does the E-spec run a 3.9 rearend then?

 

Hmmm, interesting. Depending on your mods, you might have a problem since most of the people here in the states dyno'ing with the Pettit ECU are closer to 320rwhp at 13 PSI.

 

those numbers are not too shabby besides the last dyno @13psi. what level octane were you running on your dyno?

 

In my experience there's 10-15rwhp increase per 1psi of boost.
And if HKS TP gets rid of my high RPM ignition breakup, I should be able to run 13psi, thus around 310-320rwhp I think/hope.

I think measurement at 10psi is quite good. 280rwhp/268lfs-ft tq.

There's a problem alright
But the point is that there's not much difference in M2 Stage3 and Pettit Unlimited ECU.

However, I run midpipe (which M2 doesnt suggest, or so they say).

 

I have put in some 100 octane. But thats a little bit different to US octane numbers. I think its like 95 octane in US or so.

"91 RON octane is equivalent to 87 CLC octane"

 

According to other existing dynos, there is a difference. I've yet to see a M2 ECU (without a piggyback) make 340rwhp+.

 

Well... then at least at 10psi there wasnt a difference.

And also I have ignition breakup at higher boost regardless of ECU

340rwhp on Pettit ECU is just plain awesome
That was probably at 14psi though.

Maybe I'll put in some octane booster and try it out just for the bragging rights, lol.

But keep in mind my motor has about 40k miles on it and turbos about 85k.

 

That's one reason why I said something else is probably going on. You shouldn't have break-up at those power levels.

Yes, those are numbers running 14-15 PSI which I way I mentioned you should be around 320rwhp at 13 PSI with the Pettit ECU.


Unless you have low compression, you shouldn't be dropping off that much power unless something else is wrong.

 

I wonder what the injector duty cycles were like for each computer? 115%?

 

Here's someone who dyno'd a Pettit ECU on a stock ported motor:

 

Why ? At 280rwhp there should be still plenty % left

 

There is a very big misconception about high injector duty cycles here on the forum...

 

Its ignition related, I'm 99% sure.
I see no other explanation that I made 10rwhp more @10psi compared to 13psi.
New plugs, new plug wires, new grounds.
At 10psi its perfect, smooth, powerful.
At 13psi it stumbles. And not as its shown on the graph, but more abruptly, then picks up but its already lost its momentum and thus low hp reading.

 

There could be many reasons (i.e. fuel problem, coil not working properly at higher levels, etc) but what I was indicating is that an ignition amp if it fixes the problem is just really masking it. You shouldn't be getting any break-up, if that's the problem, at those power levels.

I've seen guys run the stock ignition much higher without problems.

 

Mahjik, those numbers were with a MP, correct?

 

IIRC, yes. That's why I suggested he should be near 320 at 13 PSI when the MP was at 324 at 12 PSI.

 

Thanx, I was just curious about the numbers (I run a Pettit ECU); not trying to stick my nose into the debate.

 

No problem. RTS3GEN dyno'd his car with a Pettit ECU and Pettit ported engine (all the bolt-ons) and got 359rwhp at 15 PSI (he also has a 11.77 run at 14 PSI).

 

Any hints what to look for or where to look ?

What can cause car to stumble at higher boost ?

Too bad they cant do AFR readings, it would tell a lot.

Can there be a bad coil. Isnt coil like its either working or its not ? Can it be something inbetween ?

I have an old O2 sensor inthere, but it shouldnt matter in higher revs.

Really, I'm stumped.

 

Duty cycle should be 89-92 unless someone screwed with it.