LA3 question

XR4Ti / Sierra / Sierra Cosworth Discussions - Questions, problem resolution, general talk, technical tips and modifications.
User avatar
merkurdriver
Level 8
Posts: 5873
Joined: Tue Jan 21, 2003 4:29 pm
Location: Northeast Ohio
Contact:

Re: LA3 question

Post by merkurdriver » Wed Jul 18, 2018 12:16 am

my8950 wrote:
Mon Jul 16, 2018 6:15 pm

Regarding ECU swap to the LA3/8UA types, I've read that the benefit is the 16MHz clock speed among other things improves the performance. As mentioned it also gives more "headroom" for modifications.
Agreed x 100. Its like getting a new desktop computer thats twice as fast as your old one was.
Mass air meter conversions fumble all over the place on any of the 8 bit ECUs, but LA2 LA3 8UA 16 bit ECUs manage to convert the information fast enough to actually work properly. Thats my biggest reason for going to a 16 bit ECU.
FYI
(We are working on a plug and play piggyback chip for mass air conversions that only work with the LA ECU...
so far put down 325 HP, 360 ft.lbs at the wheels with an LA3, chip, mass air conversion, plus some other stuff )

User avatar
Spaldino
Level 4
Level 4
Posts: 382
Joined: Mon Nov 29, 2004 9:34 am
Location: Kalamazoo, MI

Re: LA3 question

Post by Spaldino » Wed Jul 18, 2018 11:48 am

what about timing after you install the LA3? didn't the Turbo Coupes run a different timing than our XRs?
88 Mono-white XR: Side exhaust, Walbro, MC2 Front Adjustable Coilovers, Rear Bilsteins, Full Poly bushings, MC2 Diff Mount, Rapido intercooler, Some sort of mild cam(?), Rear Disc conversion, 225s on 17x8 wheels.

User avatar
John Brennan
Level 8
Posts: 11489
Joined: Wed Jun 18, 2003 4:19 pm
Location: Scottsdale, AZ "Summer Is Coming"

Re: LA3 question

Post by John Brennan » Wed Jul 18, 2018 11:51 am

Spaldino wrote:
Wed Jul 18, 2018 11:48 am
what about timing after you install the LA3? didn't the Turbo Coupes run a different timing than our XRs?
Yes, static timing (with SPOUT out) is 10* BTDC, just like every other Lima EEC except the PF-Series for the XR 5-speeds.
This is my car, and these are my people!
1989 XR4Ti 5-Speed
2001 BMW Z3 3.0 5-Speed
2015 Fiesta ST 6-Speed
2015 Edge 3.5 V6 Auto/Paddles

cmouta
Level 3
Level 3
Posts: 235
Joined: Wed Mar 05, 2008 5:25 pm
Location: West Haven, CT

Re: LA3 question

Post by cmouta » Tue Jul 31, 2018 10:34 am

merkurdriver wrote:
Wed Jul 18, 2018 12:16 am
(We are working on a plug and play piggyback chip for mass air conversions that only work with the LA ECU...
so far put down 325 HP, 360 ft.lbs at the wheels with an LA3, chip, mass air conversion, plus some other stuff )
That's a bit of interesting info nonchalantly slipped in there. When can we expect to hear more about this?
Chris
2013 Nero Fiat 500C Abarth
1988 Mono Rosso Red Merkur XR4Ti
1974 VW Thing
2006 Bajaj Chetak 4T w/ sidecar

User avatar
merkurdriver
Level 8
Posts: 5873
Joined: Tue Jan 21, 2003 4:29 pm
Location: Northeast Ohio
Contact:

Re: LA3 question

Post by merkurdriver » Tue Jul 31, 2018 11:50 am

cmouta wrote:
Tue Jul 31, 2018 10:34 am
merkurdriver wrote:
Wed Jul 18, 2018 12:16 am
(We are working on a plug and play piggyback chip for mass air conversions that only work with the LA ECU...
so far put down 325 HP, 360 ft.lbs at the wheels with an LA3, chip, mass air conversion, plus some other stuff )
That's a bit of interesting info nonchalantly slipped in there. When can we expect to hear more about this?
Its in the works...we'll technically its been working for a long time, just need to make a plug and play user-friendly version.

popimpracer
Level 1
Level 1
Posts: 93
Joined: Mon Feb 13, 2006 2:22 am
Location: TN.
Contact:

Re: LA3 question

Post by popimpracer » Wed Aug 01, 2018 2:28 pm

TIME FRAME ON AVAILABILITY? WILL IT WORK ON A REPINNED LA3?

oemoilleaks
Newbie
Newbie
Posts: 31
Joined: Sun Aug 05, 2018 6:35 pm

Re: LA3 question

Post by oemoilleaks » Thu Jan 10, 2019 11:55 am

popimpracer wrote:
Wed Aug 01, 2018 2:28 pm
TIME FRAME ON AVAILABILITY? WILL IT WORK ON A REPINNED LA3?
Very interested on if it will work with a repinned LA3

User avatar
reddy2300
Level 2
Level 2
Posts: 136
Joined: Mon Aug 31, 2015 9:41 am
Location: Columbus, Ohio

Re: LA3 question

Post by reddy2300 » Thu Jan 10, 2019 5:39 pm

thesameguy wrote:
Fri Mar 02, 2018 2:27 am
The 190hp '87/'88 TurboCoupes were intercooled... that's where the power came from. :) You're not gonna see any useful increase with just the ECM. Drivability and probably emissions? Sure. But not power.
Actually, those were just about the worst intercoolers ever devised. Sitting right over the hot turbo with (really) very little airflow. I ran a PE computer with no intercooler in my XR for a long time. I made a huge difference as the timing tables are more aggressive than the PF3 that came out of it. I'd do it again in a heartbeat.

Adding the intercooler made it so I was comfortable raising the boost with the Gillis valve for a few more ponies.
1987 5-speed XR4ti-70K mile "barn find", Rosso Red, Grant wheel, short throw shifter, PE/big VAM, 255lph pump, 3" Stinger/Magnaflow exhaust, MD "shorty" radiator/IC, fake BBS wheels, Koni Yellows, Rapido sway bars, poly/aluminum bushes, Gillis valve,

User avatar
merkurdriver
Level 8
Posts: 5873
Joined: Tue Jan 21, 2003 4:29 pm
Location: Northeast Ohio
Contact:

Re: LA3 question

Post by merkurdriver » Sat Jan 12, 2019 2:10 am

oemoilleaks wrote:
Thu Jan 10, 2019 11:55 am
popimpracer wrote:
Wed Aug 01, 2018 2:28 pm
TIME FRAME ON AVAILABILITY? WILL IT WORK ON A REPINNED LA3?
Very interested on if it will work with a repinned LA3
Yes, it will work on a regular LA3 / LA2 as well as re-pinned LA3's

User avatar
andyofcolumbusmerkur
Level 3
Level 3
Posts: 289
Joined: Mon Jul 15, 2013 7:58 pm

Re: LA3 question

Post by andyofcolumbusmerkur » Sat Jan 12, 2019 9:55 am

So I removed the PE and big vam from my intercooled car, and put them into my non intercooled car. Both cars have the knock sensor wire removed since both have been intercooled at some point. I saw the wire that someone else soldered on to the harness (grounding pin 30) and I left it disconnected for now. So I'm in regular gas mode not premium gas mode. The car feels like it has more power everywhere, and feels more responsive and alive. Base timing is still set at 13. Boost is set pretty low about 15 and it has 93 octane in it. This all makes me think the stock computer is super super conservative. Ford wanted the car to work fine in all conditions and not toast too many motors. So if all you can buy is 91 octane, you have the car filled up with 4 adults and luggage, the gas is kinda stale, and your on the interstate going up a hill in 5th gear you should be ok. If not the knock sensor is there to pull some timing until you notice the car has no power and you finally downshift. So get a better computer, tune the car the best you can with some fresh fuel, keep boost low until you have an intercooler, and just listen for any knocking. You can always sell the parts later if you go a different route. It should be one of the first mods along with exhaust system. Definitely worth the price of admission.
You can barbecue it, boil it, broil it, bake it, saute it. There's shrimp kabobs, shrimp creole, shrimp gumbo, pan fried, deep fried, stir fried, pineapple shrimp, lemon shrimp, coconut shrimp, pepper shrimp, shrimp soup, shrimp stew, shrimp salad, shrimp in potatoes, shrimp burger, shrimp sandwich....

Post Reply