So a friend of mine brought a friend of his over who has an EVO all sorts of fuxored and asked for my help. He had the car tuned by someone else and it was shutting itself off everytime it was off the gas and in still in gear.

And I'm trying to get the car running and tuned well. Any help would be greatly appreciated. So many things about this car are not stock so any specific info anyone has in relationship to his parts would be awesome.

Evo IX GSR
He purchased an HKS 3037 turbo kit.
RC 750 injectors with some aftermarket fuel rail.
Walbro 255lph fuel pump
BOV vented to atmosphere
272 cams


Some questions:
1. Injector scaling
Does anyone have injector scale info on RC 750's?
I have it currently set at 597cc. Previously it was set to 636cc but STFT's while cruising were near 25%. With 597cc injectors, fuel trims lay around 3% which I consider pretty good.

2 Injector Latency:
I've adjusted latency around 14volts
When I log, I can't seem to find when the car won't be near 14 volts so I guess the other values aren't really all that important. Any input appreciated.



3: MIVEC:
I have done some considerable dyno tuning with an almost stock IX and have discovered some pretty amazing things you can do with MIVEC.

However, I have never messed with 272 cams in conjunction with MIVEC and in conjunction with an aftermarket turbo.

I am currently using my MIVEC map with his cams, however I believe there can be lots of power to be gained by adjusting this.

Currently I advance MIVEC as much as possible during spool. Once full spool and peak torque is reached, I gradually taper down to redline.

In theory, how should the MIVEC map be adjusted in regards to the cams and the turbo? He seems to be reaching full spool aroune 4300-4500 RPM. I am considering tapering up to full MIVEC advance at 4300 and then tapering down again.


4: VTA
At first I thought the BOV VTA seemed to cause the dying of the car. Since adjusting injector scaling and latency I don't think this is the case anymore as the car no longer dies. Regardless, what are people adjusting in their maps when VTA?:

5. Currently at idle, the car rests around 16.8AFR but trims are within norms. Advice?

6. Load:
This is a pretty big question for me.
His car does not really reach any sort of high load at all. 200 LoadCalc? That's it?
Again, anything would be appreciated.
Screenshot attached.




I can handle AFR's and Timing. Wanted to iron down the other stuff first.

 

Load calc will be off without compensating for the bigger injectors. Do the 2byte load mod and see what actual load is.

 

Doing the 2byte load mod now.
What do you mean by "compensating for bigger injectors"?
I changed injector scaling as well as latency. Are you saying the load calc will still be off even after doing that?

 

With larger injectors, LoadCalc will be off until you modify the EvoScan XML file to read the same scaling value that you have in ECUFlash.

It's better to just log the 2-byte and not worry about the calculated value anyway.

 

Edit: PD1 answered your question.

 

Thanks. Much appreciated.

 

Latency is off .. you can try this .. 750cc RCs

really depends on how the 272 is setup and what is datum (OE IX comes with cams retarded??) .. using the E7/8 HKS 272 as datum advance helps spoolup and low end .. retard gains high ..

check above for injectors and latency

2byte load .. and log 2byte airflow also if you can ..
this normal as the car is unable to make power .. as you start messing with the parameters .. you'll find that it will move progressively towards the higher columns

 

Thanks.
*EDIT*
Got it. Thanks much. I'll test it out and see.

Strange though. I logged my STFT's at a scale of 600 and my trims were fine.

 

I'm very curious how you came up with your latency #'s?
I didn't see much of anything except for 14Volts. So how do you know what the values should be at say 4.69 volts?

 

Just tested it. It worked well.
It happened to line up to my Fuel map quite nicely too.

 

Something like this might get that thing to spool like it should. Remember tip-in AFR's are important in helping spool as well. 12.5 is a good goal transitioning fast toward whatever your goal AFR is.

 

Thanks John.

My stock EVO IX mivec map is somewhat similar to that.
Is that one for aftermarket cams?
I'm the type to want to know the reasoning behind stuff. So with the aftermarket cams you're still trying to throw as much air as possible to it early on?

 

Yes .. nice isn't it?

Don't ask me about the rest of the voltage latencies .. hehe .. I only changed the 11v and 14v .. if you have starting issues .. change the 11v .. if you have cruising issues .. change the 14v ..

here's the mivec from a Dynoed GT3037
Full boost is 5200rpms on dyno but 4200rpms on the road at 2nd gear (26psi)
any reduction in VVT netted a loss .. almost similar to John's .. guess the minor variation is car specific..

440ftlbs torque at peak ..

 

That map isnt for aftermarket cams per se, but rather to maximize cylinder pressure but opening the intake valve as early as possible. Since I didnt know what "272" cams I was dealing with I didnt have a precise map to give. If it is Cossies, the map is really pretty close. The JDM RS map, as you probably know, has 28.8* advance. The factory system has 30* in it, so opening it early builds pressure which helps spool.

I think that a 3037 (3076) should spool before 4300, but your definition and mine might differ. How much boost by 3000, 3500, and 4300? Is it full boost at 4300 or just starting to move at 4300? What A/R on the hotside if you happen to know. I am curious to know and then hear results to see if this helps or not.

JB

 

Thanks! You've been very helpful.

I will find out more info. I can't see the turbine housing to determine what hotside is on it. There is a heatshield over it.

As far as I know it's the HKS kit 3037 ...so whatever that comes with.
Currently I'm trying to tune it for 20psi and will be going up to 25psi on 93 pump.

When I say "spool" I am referring to having the car reach into the 20's for boost.
Currently it seems to be reaching full spool about 4500. Eww.
I can do better than that.