Sonny

Hi All:

Just got my FD on the dyno for the first time. Here's the chart:



Mods:
Mazda Reman with about 25k miles on it
M2 Stage 3 ECU
Bonez DP
Greddy/Trust old school exhaust (single tip)
Cheap Bastard intake kit
Double-throttle plates removed
Hallman Evo RX boost controller set at 12 psi
Stock intercooler
Stock main cat

The dyno operator had a hard time getting the RPM signal to correctly pickup. The best he could manage was something that showed the RPMs cut in half. As a result, the torque was not plotted. HP is a function of torque and RPM, so for a given HP, if RPM is cut in half, torque must double. It made the chart really hard to read. I told the guy to stop the runs at around 7500.

As you can see, this ECU dumps in a lot of fuel on top, but it didn't foul out the plugs like I was expecting it to. Overall, I am really happy with it! It's Jim LaBreck's (jimlab) old M2 ECU from several years ago. I was pretty set on selling this thing and getting a Power FC, but now I think I'll keep it.

You can also see the Adam's Cheap Bastard intake makes a very big difference in the higher RPM range. I lost about 12whp from ~5500 to ~7500.

Sonny

RE Suzuki

Thats a good number! you have similar mods as my fd. Only mod difference with you is that i have arc induction box, greddy smic and stock exhaust. Now I know aprox. how much I'm pulling out without putting my car on dyno.

FDeez

Damn. Those are definately good numbers! Negative's old FD made 280HP to the wheels. He had the M2 airbox and an M2 intercooler on you. Good stuff.

overkill

Those are great numbers given your mods, congrats! One thing I noticed is that I beleive the rpm scale on the bottom is not correct....

sicminded

nice dyno.

to give everyone else an idea on what other cars are putting down on this dyno, my brother with a ws6 dyno'd 324whp on this exact same dyno at atp in fremont. he had basic bolt ons.

question: when you are saying that "Adam's Cheap Bastard intake makes a very big difference in the higher RPM range", are you trying to say/ or pointing out that his intake is an advantage or disadvantage in the higher rpms. a little confused because by saying "very big difference" it seems like you are saying that his intake is an advantage and a good thing, but when you are saying that you "lost about 12whp" isn't losing horsepower a bad thing?

just wanting to clarify your results with his intake.

thanks,
chris

tiger18

iTrader: (1)

i need to ask a really silly question here guys. is 280BHP relly that good i thought standard cars put out 255BHP. unless im confusing power to the wheels with engine power

RX7Wishing

^ yes.. you are confusing it.

Sonny

sicminded: Sorry if that was confusing. The last pull (green one) is the one with Adam's mod disabled. I lost a lot of power from 5500-7500. So, his airbox mod/heatshield combo are a great advantage...especially for the price!

tiger18: A bone stock FD makes 255hp to the crank. They usually dyno at around 215-220 whp (wheel horsepower). That's about a 15% loss. So, if my car made 280 whp, it is making about 322hp to the crank (using the same math).

Sonny

SpeedKing

iTrader: (4)

Nice numbers for those mods!

the ancient words

chuck the pos stock intercooler and main cat and liberate about 40 rwhp.....it feels GOOD

edit: you're flirting with disaster running 12 psi on the stock IC....the thing heat soaks when you fart on it

sicminded

no problem. i was just curious. thanks for answering.

later,
chris

RE Suzuki

what happens when you run 12psi on stock IC? I had it running on stock ic for 6 months with 12psi...

adam c

iTrader: (2)

280 is pretty good Sonny. I would like to take a ride in your car sometime I want to see if it really goes like a "raped ape". It looks like it does!!

I think its ok to run 12 psi on the stock intercooler. When I got my DP & M2 ecu, Kyle at Mostly Mazda took the car for a ride with me. I had a stock intercooler at the time. He checked the boost to make sure it was at 12 psi. He said that 12 psi is where it should be. He didn't want it any higher than that, and it may have been because of the intercooler. Anyway, he is an expert, and says it is OK at 12 psi.

scratchjunkie

^ too bad kyle is gone, that ******.

adam c

iTrader: (2)

When did he leave? Where did he go?

KevinK2

Problem is it takes 14-15 at the turbo to get 12 at top end, and stock IC is not efficient, esp at sustained load like track events. Water spay helps 2nd problem, but nothing fixes the high pressure drop.

overkill

More than likely the reason why Kyle does not want the boost any higher is because of our low actane here in CA. Kyle married some girl and moved down to Texas where is is working as a mechanic at a Mazda dealership, last I heard. But, it is true that the stock I.C. is horrible at cooling intake temps as well as heat soak. If he changes to an aftermarket I.C., he's looking at a good 20 hp gain.

Those are pretty good numbers for Sonny. I dyno'ed 277 whp/243 tq with the following mods below- minus the hks twin power. I had massive breakup at high rpm's because one: the M2 ecu runs quite rich and two: my ignition was weak up top. I think the fact that I have 125K miles on the engine and turbos did not help my numbers. I'm buying a new engine soon, and have replacement turbos that I ported ready to put on. I also have a greddy prfec B and will use it along with a reso MP. Let's hope my numbers will be around 330rwp. Wish me luck!

adam c

iTrader: (2)

Kevin,
I agree with you that the stock intercooler isn't very good. It is harder on the turbos, because it isn't very efficient. However, Kyle that told me 12 psi is safe. He is an expert, and I believe him. It certainly is harder on the turbos, but it isn't going to kill them ..... right away

Overkill,
Thanks for the info on Kyle. He was very helpfull to me, and quite knowledgeable. I hope he is doing well in Texas. I'm sorry he is gone

overkill

Yea he was a good guy, I'm sorry he's gone, but then again, M2 is no more as well.

JaNusSolSumnus

M2's site is still up, what do you mean they are 'no more'?

I'm very happy with my M2 stage3 but I am awaiting a RX7.com ECU I reacently purchased because it can handle a midpipe which is where some real power can be had. I wish the M2 could sustain one as from the way it runs now I can tell the tuning was well adjusted.

~Kris

overkill

Brian has sold the shop and the current owner has no plans to specialize in rotaries. Brian has retained the online store though.

In regards to the M2 ecu and midpipe, I plan on running the greddy profec B to control boost when I put on a reso MP. With that setup, I will be able to use the M2 with a midpipe safely. One other factor that helps is that the M2 ecu is mapped overly rich which give you more of a safety margin. Good example is to look at Sonny's a/f ratio at high rpm's. My a/f ratios went below the graph when I dyno'ed at ATP. I think it was somewhere in the 9's!

Sonny

^^^ Yeah, based on the a/f ratios shown, I would tend to think that the MP would be safe if the boost could be kept under control. With your ported wastegate, that should hopefully be enough.

Sonny

KevinK2

Some happily run an Apexi SAFC with a chipped ecu to get the mix right at the top. Can reduce fuel flow in rpm bands, when at wot, among other things. Since it reduces the pressure signal to ecu to lean out, only issue would be if omp flow is reduced ... don't know.

JaNusSolSumnus

Yea, thats the thing though -- my wastegate isnt ported and I have no plans of removing the turbos for that anytime soon. I'll see how the RX7.com ECU runs, a couple people raved about it so I should be happy, if not I'll sell it and go back to the M2.

~Kris

BlackRX7Turbo

I have close to the same mods as you, and close to the same power -- 275HP.... my chart looks very different, though.... mine show obvious rise up to 4500RPMs, then you see it jump quickly up....

The difference in my setup is M2 stage 2 ECU, underdrive pulley, HKS intake... I don't have a boost controller, though... and I have no idea what double-throttle plates are for! (doh!)