My turboed 3FE, couple ?'s for anyone who has done it, injectors, Megasquirt? (1 Viewer)

[YooperCruiser]

Are you going to fool around with the AFM tension and/or O2 sensor spoofing for part-throttle closed loop operation with the larger injectors? As I understand the ECU looks at coolant temp, AFM position and RPM to calculate base injection timing, then applies an O2 correction to try and maintain target AFR. With larger injectors, open loop (start-up, cold operation) is going to be super rich with the ECU using its base maps w/larger injectors. Also not sure big the O2 correction window is but I can't imagine it's large.

The forums are kinda brutal and the posts are all pretty old, but check out the old MKII and MKIII Supra forums. Lots of guys doing forced induction on what is essentially the identical injection system (licensed copy of Bosch Motronic/Jetronic I believe). Might also find some info on older BMW forums.

Keep us all posted how you make out.

You got me thinking about the AFM so I checked all the resistances with the FSM. Everything checked out except when sweeping the contact it would drop out a few places per sweep. Cleaned it up with a Q tip and contact cleaner and it was good again. Then I rotated the spring wheel 6 teeth counterclockwise and wow what a difference. I need to take some fuel out of the O2 enricher cause when that's active I'm down to 10-11:1, and under higher load and accelerating where I was hitting those lean 15-16's I'm now down in the 12 & 13's, that's still part throttle, I haven't hammered hard on it yet but I never really do anyhow. I'll run it like this for awhile and see how it goes before I do anything else.

 

[bj70bc]

nice

 

[kw90surf]

You got me thinking about the AFM so I checked all the resistances with the FSM. Everything checked out except when sweeping the contact it would drop out a few places per sweep. Cleaned it up with a Q tip and contact cleaner and it was good again. Then I rotated the spring wheel 6 teeth counterclockwise and wow what a difference. I need to take some fuel out of the O2 enricher cause when that's active I'm down to 10-11:1, and under higher load and accelerating where I was hitting those lean 15-16's I'm now down in the 12 & 13's, that's still part throttle, I haven't hammered hard on it yet but I never really do anyhow. I'll run it like this for awhile and see how it goes before I do anything else.

Update?

 

[YooperCruiser]

Update?

No haven't really done anything else and just pulled it out of winter storage yesterday

 

[dogfishlake]

No haven't really done anything else and just pulled it out of winter storage yesterday

Ahhh, life in the land of salt. I get it.
I'll be up your way a couple of times this summer. Would be great to meet for a brew and check your 62 out. I know I have seen a red 6X series up there before, might have been you.

 

[Marco Lau]

FOLLOWING...

 

[Marco Lau]

Can you post a picture of the intercooler??

 

[AussieHJCruza]

I've never messed with a 3F-E on stock ECU so apologies im advance. Is there any way you can look at long and short term fuel trims?

I'd hazard a guess that you're fighting the ECU in closed loop chasing stoich

 

[YooperCruiser]

Ahhh, life in the land of salt. I get it.
I'll be up your way a couple of times this summer. Would be great to meet for a brew and check your 62 out. I know I have seen a red 6X series up there before, might have been you.

Yeah that would've been mine, it's the only one around. I own The Brake Doctor at 1000 S Front Str and it's usually sitting there in the summer. Stop by if you're in town

 

[YooperCruiser]

Can you post a picture of the intercooler??

 

[dogfishlake]

Yeah that would've been mine, it's the only one around. I own The Brake Doctor at 1000 S Front Str and it's usually sitting there in the summer. Stop by if you're in town

That's where I've seen it! Will definitely stop by. Cheers!