reza

Hey there,

I notice on my car with WBO2, that the 5.08 seems to be very lean in the N4P9 to N7P16 range. The target AFR for those region are in the mid to high 12. But I kept on getting AFR around high 13, some 14.
Then I tried 7.07 maps, that gave me the mid to high 12 range for those region.

Anyone else have similar experience?

Car mod engine wise are: dp, hfcat, n1dual, k&n filter in stock airbox, stock ic.

cewrx7r1

iTrader: (2)

If you do a comparison of the two maps with a DATALOGIT, you can see the differences.

It is obvious to me that the 7.07 was made for the 99 and later RX-7s.

Most noticeable when loooking at IGL.

reza

Is this 7.07 map better than the 5.08 for us to use on the US FDs?

I did not look at the IGL, but compared only the INJ. The car seems more powerful and smoother with the 7.07
What differences are there on the IGL? more advance?

POM HB

reza,

Get the 7.07 map and give me

POM HB

reza

I did...but low end still sucks...
I am looking to get more low ends. between -10mmhg to 5psi. This is usually when you are modulating the throttle thru turns....

twokrx7

iTrader: (1)

How much time do you spend at this vacuum to low boost condition under heavy throttle/acelleration? Is the car bogging down under these conditions? slow to make boost? fouling plugs?

Not sure I understand what you are looking to achieve or what problem you might be trying to fix.

In your P4-6 area I tune to 16+ AFR, this is my cruise region with the ported motor up to 90+ mph. Above that I simply tune for a transition to my target AFRs under boost. Maybe around 12 AFR at 5psi. Since I'm not expecting much between vacuum and 5 psi I haven't experimented much, simply made gross fuel adjustments to linearize AFRs and spot timing adjustments to avoid high knock.

reza

Well this is the thing. For Autocross purposes. In mid turn, you don't have full throttle, you modulate. As soon as you clear the turn or going out of turn, I want full power. But the car would not do that...What AFR would allow me to have this?
When I did 3rd gear run straight from 1500rpm to 7500rpm. I feel that 1500 to 3000rpm is slow....bogging...then as soon as boost hit 12psi, it goes, then transition is at 5psi, which also bothers me a lot too...

twokrx7

iTrader: (1)

Let me rephrase what I think I read in your response.

You are trying to accelerate at below 3000 rpm and not satisfied with the performance. May I conclude that one of the following is applicable:

+ you should consider downshifting prior to the corner to come out in a lower gear at higher rpm, don't fear the rpm and heal/toe rev match when down shifting to prevent unsettling the car
+ your boost response is slow or laggy, are you running sequential twins? if so, are they working properly? if not, tuning (advance timing or play with fuel) a bit may help but likely not get a night&day improvement, sorry.
+ perhaps put in an LS1 V8?

???

reza

hehehe....no LS1 for me...only the wimp drives V8.

okay in autocross, you have big turns and tight turns, most of the problem is in the tight turns. And for most part, shifting down will waste more time versus staying in 2nd gear.
Most autocross is in 2nd gear anyway.
I recently change to PowerFC from stock ECU. It seems that the stock ECU is much better in the low end department.
So at the least, I want similar power in low end as stock ECU.

Another issue I have looking at the log is the Precontrol seems open too much the first time, then going back up to recover the boost. I thought that adjusting the base duty will help, but not, the base duty does not determine the first opening of precontrol.
The same thing with the wastegate, it opens too much thus transition drop to 5psi, then recovering back from there.
Don't want to get boost controller, can I do something about this?

POM HB

Hummmm....

More low -end power from stocker ecu? I don't have that. I think when I change to PFC, my car run just like stock ecu down low (but a little bit smoother) w/ more power top end.

twokrx7

iTrader: (1)

I can't help you with the sequential, perhaps you should carry more speed thru those low speed corners

Houdini

iTrader: (3)

Hey Reza, where did you get the 7.07 map?

I finally got around to lowering the transition RPMs on the PFC. It did help my problem but there's still a problem. Might be good for you to try out to help lower control boost spike at transition. Just put the low and high RPMs closer together so the second turbo doesn't spool so long that it overwhelms the system. Probably lowering both will help the primary from running out of breath before the second comes on also.

Hoodin

reza

I did play with the boost transition. Whatever you set it at, it will transition about 500rpm later, that is what it looks like for me.
I left it at 4080rpm. Did try 4500, and it transition about 5000rpm. Then bring up the first number from 3000 to about 3800rpm, now it is nicer. If you let go throttle, then back on it at 3500rpm, the primary will boost, instead of the empty loud exhaust noise and no boost...

I wish there is a good target AFR map with good balance of most power and reliability on a cell. I think the stock AFR from 5.08 is about fuel economy...who cares...

The 7.07 is available from datalogit yahoo group.
Feels much smoother than 5.08.

cewrx7r1

iTrader: (2)

When I converted from SEQ to NON-SEQ turbos, it was obvious that boost built slower, but I partially corrected this by increasing timing in the area of 2000rpm to 3500rpm and increasing fuel to this area which is lean.

My AFRS now change very linearly from my approx. 16AFR at cruise to 11.5 at 12PSI boost to 11 at 15PSI boost.


Before AFRS were in the 14s untill about row P16.

Houdini

iTrader: (3)

if you advance timing on the lower end, you'll get more torque but you have to be careful. If you run race gas, you can advance it more than regular pump gas since it's harder to ignite on it's own.

reza

Chuck,

Is that mean that if I set AFR of 12 to 11, it will give me the most power safely at any RPM/Load range?
I saw some disturbing AFR around N3P8 to N9P17. It is about 1 AFR lower than the target AFR derived from 7.07 or 5.08 maps. The AFR target calls for high 12 to low 13. Should I just put it to under 12?
Oh yea, I don't really care about fuel economy, that is not the reason I have PowerFC.

cewrx7r1

iTrader: (2)

Transistion from idle/cruise to boost happens almost instantly. P rows 1 to 9 are for idle and cruise. These can be made as lean as you want as long as the engine does not buck from being too lean. I run about 16AFR here.

Originally when going through P10 to my P18 row(14 psi in my setup) the AFRs were lean until hitting around P16 row.

I was still having 14sAFS until about P15. This is lean for being on boost. So I richen up the area as previously mentioned. This will increase power and build boost sooner.

Now my AFRs richen up smoothly from 14.7 at P10 to 11.5 at P17.

You only can learn by reading and experimentation!

reza

Thank you Chuck...I did have changed my maps pretty dramatically so far, and the AFR is still too lean than I want it to.
Is it okay to have AFR of 14 in P10, just like you mention? Because the target AFR in the 7.07 was around high 12

cewrx7r1

iTrader: (2)

14.7AFR is Ok in P10 as that is normally 0 psi.

reza

Chuck, I did some tuning about 3 hours of it.
I pulled out a lot of fuel from P2 to P7. Disable the O2 feedback.
What I notice as I pull out more fuel from idle/cruise area is the car tends to jerk during instant throtle. I don't like this.
My solution is to increase the fuel cut recovery to 4000rpm. Thus it does not go lean when I stab the throttle....Its much smoother now, but fuel is wasted during deceleration....
Any comment?