Bruce Merrill

Is Mazsport still in buisness. I want to get some intercptor info.

Brettus

iTrader: (2)

No

but ask away - someone may be able to help ...

05rex8

iTrader: (7)

no.
what info do you need?

Bruce Merrill

I am trying to tune a customer built rx8 with cust. instlled Power Mod piggy back, sfr turbo kit. I can not get enough fuel in under 6k rpm low boost under 6psi. It is not gonna happen! I checked the injector duty cycle the primary 2 & high power come on late so there is not much for the piggy back to modifie from the injector circuit. it has (4) 550cc injectgors & stock primary.
I heard thge interceptor is a good ecm to use.
I am stuck & feel realy bad for my customer.any advice is appreciated

fastlaneracing

Check the fuelpump and the fuelfilter its a well known problem.

Red Devil

I've heard pretty good things about the Powermod. Did you try calling SFR, DNA or Mazdatrix regarding its functionality? One of those three might be willing to give you a hand. I have not used a Powermod so am afraid I can't help any more than that. There must be some function to restage the injectors as you like similar to the Int-X.

Brettus

iTrader: (2)

I used the Powermod with some success when I first turboed my car . That was with stock injectors and running about 7-8psi if i recall . I do remember having a lean spot somewhere around 4000rpm that I was having difficulty with tuning out . I imagine your larger injectors are making the issue worse as you cannot scale the injectors with the Powermod .
I found many of my issues went away once I figured out how to stop the ecu from building excessive fuel trims . Can help with that if you wish ? You will need a scan tool to see what the fuel trims are ......

However I now run a flash tuner and have made no alterations to the primary injectors or injector staging and don't see an issue there anymore so I can't see why you can't richen it up with the Powermod .

I currently run 280cc p1s 480ccP2s and stock 380cc secondaries and am pushing 325whp at 11psi although I'm only running 8psi till about 4500rpm.

Razz1

Power Mod is one off. Most people use the Access Port for the RX 8

halimsteven

when we change the injectors, do we have to change the fuel pump too? may be you have to change the fuel pump, i don't know. my car is using the 680CC with primary and 750CC for outside secondary. if you wanna see my map, let me know, and my car still use 40% injector cycle, adn i am running 8psi and 11psi.
let me know if you need to see it
steven

FazdaRX_8

iTrader: (1)

I would tell your customer to switch to the cobbs access port, however you will have to move his maf from the pressure side to the pre-turbo side.

Brettus

iTrader: (2)

/\ the Powermod will work although it will always be less than ideal as it is map based .

MazdaManiac

iTrader: (3)

Not true.
As long as the MAF tube is the correct size and length, it can operate in a blow-through mode.

Bruce Merrill

well the fuel pump & filter are good. remember I have lean under 6k. the fuel trims as far as i can tell last time i checked were around zero under boost. it is like a light switch at 6k(when the power inj. come on) i have been working with sfr for 2 months now over the phone. & power mod tech. I have been threw the whole car. i cant get the afr under 13:1 under boost below 5500rpm. some times it does but usually not.

Brettus

iTrader: (2)

Double check your fuel trims - I adjusted all values (except 500 rpm) below 0psi by what ever the fuel trims were .

I can tell you that i definately did not have this issue once i had it sorted . What duty cycle are you seeing on your P1s ?

Brettus

iTrader: (2)

Like this . Leave the values shown in the 500rpm row at zero otherwise you will have starting issues . Ignore the boosted values as well as this map was from when i was using a combination of flash tool + Powermod
Note the values between 3500 and 4500 take even more fuel out than the rest of the map - I found bogging in that range before i did that.

If you think about how your fuel trims work - they take fuel away from the entire range . So if you have say -16 under load (like I did) that effetively means if you inputted 99 in a cell in the powermod you are only adding 99% to an 84%fuel output = 167% . If you add 99% to a 100% fuel output you get 199% . So you lose 32/199 (or 16%) of your possible fuel delivery by not getting fuel trims to zero - hence your issue .
Also note that it takes several drive cycles for the long term fuel trims (LTFT) to stabilise so you will always see 0 straight after diconnecting the battery.
Hope that helps .

Bruce Merrill

judging from your fuel map did you change the primary1 injector(the 2 that have there own rail. i see you took out quite a bit of fuel (-16) in the idle areas. This car only has 550cc inj. in the prim2 & power. sfr sais that is all i need. from my testing it may be wrong. What injectors did you change & what size did you use? Thnk you for being so helpfull guys!

Brettus

iTrader: (2)

No- the p1s are stock (280cc) the p2s are 480cc and the secondaries are stock(380cc) .
Larger injectors than this are not required at the power level I am at 320-330whp .

The -16 values are there to stop the pcm generating large fuel trims . The simplest thing to do is watch the LTFT under load IE open loop (does not take much load to get into OL) . I would be very surprised if your OL fuel trims are 0 or even close to that as you have made major changes to the air intake and how it behaves .

Now apply that value to all the cells below 0.6psi . Above that you will need to retune once the fuel trims settle back down to close to zero . Disconnecting the battery may be a quicker way to get to where the trims are settled.

Bruce Merrill

maybe ther is a problem with this car that i am missing. the seccondarys dont start working till 4500rpm we are making boost below that & can not get enough fuel to the engine. i will watch the fuel trims more closely. we are very rich above 6000rpm.

FazdaRX_8

iTrader: (1)

fuel injectors hook up wrong?

Brettus

iTrader: (2)

A powermod log i did showed the secondaries kicking in (20%) at 3370rpm and about 3psi boost .......

Bruce Merrill

I dont think the power mod has the capability to log wich stage is on. i was measuring with a lab scope on ch injector circiut. before & after the powe mod. I would not dought if they come at 3750 but the ms is ver small at that point.
they are wired exactly how poer mod shows it to be done. i went threw the wiring several times. six injectors on six channels.
are you using the fueler map?

Brettus

iTrader: (2)

here is some of the log - Rad told me the PM logged the secondaries only ......


3213 RPM 0.2 "Hg 13.1:1 A/F 33% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 0.0%
3233 RPM 0.1 PSI 13.1:1 A/F 34% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 0.0%
3235 RPM 0.4 PSI 13.1:1 A/F 40% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 0.0%
3244 RPM 0.9 PSI 13.1:1 A/F 49% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 0.0%
3275 RPM 1.1 PSI 12.3:1 A/F 58% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 0.0%
3295 RPM 1.5 PSI 12.3:1 A/F 66% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 62.1%
3316 RPM 1.8 PSI 12.3:1 A/F 72% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 62.1%
3333 RPM 1.9 PSI 12.3:1 A/F 84% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 62.1%
3347 RPM 2.3 PSI 11.5:1 A/F 92% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 62.1%
3357 RPM 2.5 PSI 11.5:1 A/F 95% TPS 5.00V MAP IN 5.00V AFM IN 0.0% DC OUT 0.00ms 0% FUEL 0 IGN 62.1%
3372 RPM 2.8 PSI 11.5:1 A/F 95% TPS 5.00V MAP IN 5.00V AFM IN 20.4% DC OUT 3.60ms 0% FUEL 0 IGN 62.1%
3413 RPM 3.2 PSI 11.5:1 A/F 93% TPS 5.00V MAP IN 5.00V AFM IN 21.0% DC OUT 3.68ms 0% FUEL 0 IGN 62.1%
3389 RPM 3.4 PSI 11.0:1 A/F 96% TPS 5.00V MAP IN 5.00V AFM IN 21.8% DC OUT 3.86ms 0% FUEL 0 IGN 62.1%
3445 RPM 3.7 PSI 11.0:1 A/F 97% TPS 5.00V MAP IN 5.00V AFM IN 22.7% DC OUT 3.95ms 0% FUEL 0 IGN 62.1%
3489 RPM 4.1 PSI 11.0:1 A/F 93% TPS 5.00V MAP IN 5.00V AFM IN 23.4% DC OUT 4.02ms 0% FUEL 0 IGN 62.1%
3478 RPM 4.3 PSI 11.0:1 A/F 93% TPS 5.00V MAP IN 5.00V AFM IN 23.5% DC OUT 4.06ms 0% FUEL 0 IGN 62.1%
3470 RPM 4.6 PSI 10.6:1 A/F 96% TPS 5.00V MAP IN 5.00V AFM IN 24.1% DC OUT 4.14ms 0% FUEL 0 IGN 62.1%

Bruce Merrill

wow thats not like my car. i better re log this thing. my car even reads puls at idle. it gets alittle confusing whith 3 stages of injectors. i think my power mod is wacked. some times it has good fuel. most of the time it dont.

Brettus

iTrader: (2)

FYI . P1 duty cycle - done this morning
this is with
8psi 3500-4500
9psi 5000
10psi 5500
11psi 6000-8000

Bruce Merrill

primary1 inj. work from idle all the way
primary2 work from around 4k & uo on mine
high power/ 3rd stage come on around 6k on mine.
i am unsure as to what your data reflects above