PE vs LA3 Timing Tables
PE vs LA3 Timing Tables
Commonly people ask how much more aggressive the PE is compared to the LA/8UA ECU's. Also, It should be a good base to create spark tables in standalone systems.
Looking at it, I'm really surprised how much timing is there at low loads. Where there is 50* commanded here, I'm only running mid 30's, low 40's on my setup. I'll have to slowly increase my table in MegaSquirt and see how throttle response changes. This could be the source of my boost lag.
Here is the original link to the .pdf as sourced from TF:
http://rothfam.com/svo/reference/PEvsLA3spark.pdf
I've uploaded a mirror as well in case this one goes down:
http://www.uconncarclub.com/Joe/XR/PEvsLA3spark.pdf
Credit goes to the poster here where I first found the link:
http://forum.turboford.org/ubb/ultimate ... p=1#000003
Looking at it, I'm really surprised how much timing is there at low loads. Where there is 50* commanded here, I'm only running mid 30's, low 40's on my setup. I'll have to slowly increase my table in MegaSquirt and see how throttle response changes. This could be the source of my boost lag.
Here is the original link to the .pdf as sourced from TF:
http://rothfam.com/svo/reference/PEvsLA3spark.pdf
I've uploaded a mirror as well in case this one goes down:
http://www.uconncarclub.com/Joe/XR/PEvsLA3spark.pdf
Credit goes to the poster here where I first found the link:
http://forum.turboford.org/ubb/ultimate ... p=1#000003
Pardon this question as I'm just starting to educate myself on the ways of EFI tuning. Gimme a carb and I'm good to go, but this EFI stuff I need to learn now. In the past I just paid someone else to do it, but now I want to do it all myself.
That said - what is the parameter that the load is based on? The value that went from .3 to 2.6?
Thanks in advance
That said - what is the parameter that the load is based on? The value that went from .3 to 2.6?
Thanks in advance
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I have two XRs, one with a PE (the other stock but to have an 8UA when I get time to install it...)--the PE'd XR moves out so much more sharply under even modest depressing of the pedal, and give the pedal a bit more and it simply leaps.
YMMV
YMMV
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Lijewski: "Sum Ergo Drive-O. Mucho!
Lijewski: "Sum Ergo Drive-O. Mucho!
Ive read that thread before as well as trying to use this table as a basis for my MS install. What I can say from experience is that the timing values listed there with using 1 for load as roughly 100kpa will get you into detonation problems. I think what is misleading here is how much timing is pulled both based on knock and ACT values. Be wary of entering these without dialing in the ACT and Knock settings in your MS. At least this was the case with my experience so far.
Jeremy Kemp
RIP: the Mutt….1988 XR4Ti Chestnut Brown/Spice Leather
MC2 Coilovers and Bushings, Contour Rims and Rotors, Ported Motorsport Head, Cosworth 4x4 Intercooler, Holset HY35 Turbo, 80LB Injectors, Megasquirt2 EFI
RIP: the Mutt….1988 XR4Ti Chestnut Brown/Spice Leather
MC2 Coilovers and Bushings, Contour Rims and Rotors, Ported Motorsport Head, Cosworth 4x4 Intercooler, Holset HY35 Turbo, 80LB Injectors, Megasquirt2 EFI
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I was just about to type essentially that, so yes, Load = Air massMarkM wrote:I believe LOAD is based on the mass of the air going into the engine (as measured by the Vane Air Meter (VAM)) at the time of the calculation.MKEMerkur wrote: what is the parameter that the load is based on? The value that went from .3 to 2.6?
Brad
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the tps reading is partly there for the ecu to know when changes are being made. similar to the "power pump" ( i think that's what it's called) on a carb.
in an alpha (again, i think that's what it's called) system, the whole system runs off assumptions made from tps position rather than all the other air metering inputs.
in an alpha (again, i think that's what it's called) system, the whole system runs off assumptions made from tps position rather than all the other air metering inputs.
ian the re-animator
Correct. I believe it's called Alpha-N. It's rarely used, but is setup for mainly race motors that don't pull much vacuum.xr4man wrote: in an alpha (again, i think that's what it's called) system, the whole system runs off assumptions made from tps position rather than all the other air metering inputs.
Very good to do, but unfortunately, they are hard to find and quite expensive when you do. You will need an intercooler like you have and then to set your base timing to 10*.JimG wrote:Would the PE be a good mod for my stock '86 with a intercooler & 3"dP? If so what changes would I have to make?
The LA/8UA ECU's from the TurboCoupes are a great alternative as well.
To compare and contrast, and if anyone has any corrections/additions, I can put this up in the 1st post.
LA/8UA
- More timing than any factory XR ECU
- Goes into open loop at a higher RPM than the 5 speed XR ECU which results in better fuel mileage
- 16 bit processor vs. the 8bit of the SVO and XR ECU which gives a smoother idle and slightly better drivability
- Most aggressive and powerful Ford factory ECU for the 2.3 turbo
- 8bit ECU like the XR so no improvement in idle or drivability