Chamama

I have a 2005 JDM Evo9 GSR, ROM ID 88570008.
Currently Stock ECU.
Bolt-ons: 75mm catback, Stock cat , 65mm downpipe, Ralliart hiflow air filter, Ralliart hard pipes (intercooler + intake), ARC 079 I/C

I recently added the LC-1 wideband and datalogged. The ecu is stock. Need some input on 2 things:

1) Is the car running too lean? I have seen the fuel and timing maps, and the jdm map is more agressive than the USDM. I don't see afr less than about 11.0 till redline and at 3.5k its around 13.0. The good thing is the car is not knocking more than 1-3 counts. (except decceleration). Do i need a flash? (only eflash possible for me)

2) I am seeing pretty high levels of knock(4-9) at lift-off (decceleration). Will it be a problem?

Please note that the fuel here (bangladesh) is not more than 90 octane. Is it possible to tune the car by eflash and produce more power at these poor octane levels? JDM injectors are also a bit bigger, 542cc.

Any input welcome.

jcsbanks

It does look a bit lean through the midrange, JDM 9 GSR is like that, and I prefer it to be richer. Reduce lean spool enable from 3500 to 2500 RPM and richen the fuel map in the 2500-4500 RPM in particular. I try to get rid of lift off knock by retarding the areas it drops through as you lift.

With 90 PON and high temperatures it will be hard work. JDM injectors are the same size I believe, just they are scaled differently in the ECU to the US models.

jrsimon27

iTrader: (1)

yep injectors are the same as the usmodel but are scaled differently,the jdm evos tend to be leaner then the usamodels my car when stock and had at peakboost 12.8afrs and 11.5by midrange and by redline 11.2 this was when it was stock only with tbe.
i woulnt worry for 1-3ks

Chamama

Is it better to reduce lean spool to 2-2.5K rpm (e.g. FQ360) and then richen the fuel map, OR just disabling it alltogether and then leaning out the fuel map ?

jcsbanks

Whichever you prefer, I do the former.

Chamama

Well guys, thanks to John Banks, NJ and countless others' posts, I have started to learn about tuning on my own.

Here are two 3rd gear pulls. Determining factors: 90 octane fuel, ecu based boost control, Very HOT weather.
Please comment on Fuelling, Timing, Boost etc.

If anybody wants, I can send my .hex file for further review.

Chamama

bump for some input/advice on post #6

roger smith

iTrader: (4)

My guess is your have the boost at stock?
You could do things to make it so it never drops under 19 or 20 or whatever psi you want.

I like your timing, doesn't waver a bit.

asdfasdf128

iTrader: (60)

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