If you are playing around with the instrument cluster, can you try to fix the message center so that it keeps the last selected display when you restart?

i.e. if you have the display set on range, then restart it always goes back to the odometer reading and you have to cycle through again.

If I think of anything else i'll let you know

 

Are you able to change the AFR in open loop to 10.5-11

Closed loop is fine running at 14.7 but for the S/C engines open loop is too rich especially once you invest in the pulley upgrade

This would unlock a heap of power

Cheers
34by151

 

The ECM falls for a closed loop soon enough after a start-up, so i guess there's no reason to change an open loop AFR/

 

Me too!

 

Torque reports "Fuel Status" during WOT runs as "Open Loop using Knock Sensors" so the fueling would have to be based on a table, not the AFR's. When cruising it says "Closed Loop using O2" so there would be a target AFR number.

So there are different values that need to be changed for Open or Closed Loop.

 

Actually it's not an open loop itself. ECM continues to monitor HO2S for a safety reasons.
It's a power enrichment mode (or WOT mode) and it possible to move it even w/o touching a stock fuel maps.

 

Ok, now i have a handy software tool to compile/decompile/crc calculation of vbf file, so i guess thing will be a little bit faster.
Meanwhile, i've disabled a DPF on a 2010 XF 3.0D, took 15 minutes
Tomorrow i'll start to prepare a f/w for a non/meth ROW XJRs.

 

Huh, i wish i could
I'm not a wizard, so it takes some time and huge amount of efforts to disassemble and debug a firmware.

P.S. As for me, i'm missing a "fuel used" data on a message center, which was available on mine X308. It was pretty handy data.

 

Wow - Me Toooooooo!

 

Me to 3.08 diff got it already
Mine is just an XJ 4.2 I have already had a tune in my ECU but the transmission torque limiters and faster shifts also being in the right gear for hill work so its not shifting up then realising it needs to go back a gear
03 XJ8 X350 vin G04612

 

Trouble is under WOT the AFR is too rich robbing power
From what I have recoded its about correct for N/A but for S/C applications is too rich

Cheers
34by151

 

Oh Snap! This is gettin good!

 

It would be great if you can play with larger MAFS for the car. My understanding is that the current offerings for the earlier 4.0 SC engines are not the same for the later 4.2SC. I know with PRO M they will give you a transfer function which you may be able to add into the programming. I know with my fords that I tune myself I can easily to that and fine tune if need be. Very nice of you to share this with the community. I just ordered a tune for my 04 xjr but my 01 xkr is up for something eventually:O))

 

I want the golden goose! lol I want to get the best MPG that I can, but squeeze out any avail power when I mash down. Does that make sense? What's the closest to both worlds that you can get it and what are the trade-offs for leaning in either direction? Thanks again!!!

Rags

 

Ragman
That's what cambo and I are getting at with the Open/closed loop

XxSlowpokexX,
The MAF options like the Pro M will only assist you in open loop (WOT) as yje changes will be learned out by the ecu under closed loop. I can be done but needs a bunch of dyno time under WOT

If the AFR in open loop (WOT) can be lowered it would take care of itself with out need a Pro M or the like

The other big one is getting a change in diff ratios working

Cheers
34by151

 

cambo351, ragman1171, 34by151, please, PM me you e-mails and promise not to spread a binary over the other owners
The flash files are ready.

P.S. WOT AFR is moved to a lean side, but safety wise.

 

Moscow Leaper,

I am interested in the performance tune for my 05XJR as well. Is the SDD a requirement? I have a WDS.

Woodford Jag

 

In regards to the MAF meter I wasn't concerned with turning A/F ratio but to install a larger diameter one in order to reduce restriction

 

You can change the MAF now for a bigger one (within reason) and the ECU will adjust but other than overcoming any restriction it wont have much effect as the ecu will compensate by changing the STFT and LTFT

Cheers
34by151

 

I have been tuning my supercharged v6 eaton supercharged vehicles for years. With the twin helix roots type supercharges that we have removing restrictions on the inlet side of the charger makes a huge difference, Ive seen up to three psi increase from minor intake mods. I already have an upgraded 3.5" inlet on my 2004 xjr and want to just match my MAF size wise. ProM makes the 92mm MAF which would be perfect but the transfer function is for the earlier 4.0 engines. I don't feel comfortable doing this without being able to play with the parameters. All in the name of performance. I have nothing to add really to this thread so Ill just watch:O)..VERY INTERESTED THOUGH!