Last_Wolf

iTrader: (11)

Hi,
I just purchased a 93 rx7 with a power FC. Car has its fair share of problems that I am slowly working out, but I wanted an opinion on the tune currently in it. It looks to have been tuned by rx7store back in 06 where they installed a 35R kit on an AIM tuning street ported rebuilt motor.

Person I bought it from said it was tuned rich and for 93 octane. I live in Hawaii though, the best we have is 92 with 10% ethanol.

Car came with a PLX afr gauge. AFR stays in the 11's until about 6k, where it leans to 12.1, once past 7k or so, it goes to 10
--Unsure of the gauges accuracy. Wasn't hooked up for the past few years, and it was reading 10-11 consistently until I took it too my local auto x, now I am getting the lean area.

Some details:
Base fuel pressure is 34 psi
Compression is 85 or so on both rotors with even pulses
Vacuum is around 15 when idle is stable
Water injection kit installed by me with a 315 cc nozzle
Running the car at 10 psi, is suppose to be tuned to 15 psi though
Knock has not gone beyond 66, but is lower during actual acceleration

I am hoping to hear opinions on the attached tune as far as:
1. Is it conservative enough to run 92 e10? Running NOS octane booster in the mean time.
2. Is the map really tuned to 15 psi or more?
3. Are there any glaring faults in the tune.

Thank you for the time.

DriftDreamzSS

iTrader: (4)

I wouldn't continue to boost with AFR's leaning into the 12's. Are you getting that base fuel pressure reading with the vac line disconnected from the FPR? What fuel pump is in it and has it been rewired? Have you tried to add fuel to the lean spot? This map has more leading timing in it than many other 35r/single turbo maps I have seen around your P17 row and up, split looks nice and conservative. Your fuel map also looks more linear or flat in boost than many ive seen when viewed on a chart, most have more of a visible hump in the fueling values.

If it were my car I would inspect the entire fuel system, calibrate/ verify the wb02 is reading correctly, review the leading timing maps and evaluate for your fuel quality, get rig of that lean spot and carefully log some pulls. Good move on installing the water injection btw. Oh, do you have any issues with it returning to a smooth idle? The F/C values in setting 3 may be a little low for your setup, I know mine needed to be raised.

Last_Wolf

iTrader: (11)

My mistake, base pressure is 40, with vacuum is 34.

When you say my map seems to have more leading timing, I am assuming the timing is more advanced than others you have seen? I saw that the split is 10-12 in the upper ranges, so that seemed ok.

Fuel pump is upgraded according to one of the invoices I have, have not taken the pump out yet to check which one it is though. It is not rewired. I have checked for leaks though and replaced the filter already.

Have not added fuel yet. Like I said initially it never went above low 11 before. After using it for auto x I noticed it was hitting 12.1 in that one area. I already ordered a replacement o2 sensor, but my gauge is old enough that I need to buy the new style harness as well now. I will be ordering it this weekend.

As far as returning to idle smoothly. It normally undershoots a hair and then levels when its warm. Cold start the idle surges, and stumbles on application of gas until 2k rpm. Also it will normally stall out when coming to a stop with the A/C on.

I haven't bothered with messing with the values there or idle relearn yet until I check out the TPS voltages, clean the idle control, and check the linkage adjustments. I also only put in the Datalogit last week.

I'm not too concerned about the process of adding fuel once I know that my WB is correct. From what I understand I can adjust the value in the INJ map until its about right and calculate the change for the base map value.

The timing part is what I am lost on. I don't know how to evaluate if the timing is safe for 92 octane. I have never gotten bad quality fuel at the place I go to (over the past 12 years), they sell in fairly high volume and are basically a Chevron.

At the current leading timing, do you feel the octane booster is necessary? Or should I run some logs with and with out to see if there are any changes? Thanks.

DriftDreamzSS

iTrader: (4)

yes, you can add fuel to the inj map to get it where you want then re-calc the base map to reflect those changes and zero out the inj map back to all 1.0 values. As far as the timing I dont have enough experience to offer you much help there, if the car has run this map for 7 years it very well could be just fine. I know personally I tend to be a bit overly cautious with tuning and like to mimic some of the more conservative maps from the veteran tuners especially since I only have crappy 91 octane. You should consider joining the yahoo tuning group for PFC-datalogit, there are many maps available and many more knowledgeable people to assist you.

Last_Wolf

iTrader: (11)

Yeah, I am assuming that as well with the timing, but figured I would ask anyway.

You have to contact arghx to join that one correct?

Thanks for the comments. Its going to be a while before I get to fine tuning though, I found some more issues that need attention.

con-3-fc3s

Are you from Oahu?.. If so have munkey garage take a look at it..

Last_Wolf

iTrader: (11)

Big island. As far as I can tell I'm on my own. I'm learning quickly enough, and as far as I can tell my timing is more advanced than others, but it seems to be fine as far as knock. The tune is a little rough as far as the AFR in areas, and I found out my IAC doesn't have a signal or ground. Explains my idle problems. New project, just working through it slowly. Thanks for the info though.