Best BIN for runing 1.5 L 4 cylinder

[POZE]

Thanks to all.
I have an adapter to replace the variable venturi with a fuel injector so the original carb becomes a throttle body. I had closed throttle VEs in the 30s with 12 psi fp to get 14.7. I did not change the bpw constant setting of 134. The idle at 14.7 wasn't perfectly smooth like it was at 13:1. I played allot with timing to try for smoother idle at 14:7. I ran smoke machine to look for vac leaks.
I modified the gm dist to work and use 5 deg. timing that is in the scaler. Also using GM alt.
I will continue with this setup knowing you guys can lead me through OL idle. I will look at the XDF and ADX.
So I need to increase the fuel pressure closer to 20?
Will post pictures soon

[EagleMark]

I'd have to say that is the first time I have seen that done with an injector in a conversion! You'll be great around here as we try to think outside the box when possible.

Gotta have a TPS! And MAP!

1project2many was saying a differant injector with differant pressure, not the one you have.

[POZE]

I have the TPS and Map. I can't take credit for the TPS bracket and injector adapter. They came from Patton Machine.

[1project2many]

Even OE engines often require some "fiddling" to make them run well at idle in closed loop. Cam specs can play a big part in this. If you're going to go open loop, and you don't have a cat, you can go open loop "everywhere."

I didn't say turn the fuel pressure up to 20 psi. I said using the 454 injector and adjusting pressure to 20 psi gives about 43 lbs per hour of fuel delivery. If you increase pressure in your current injector to 20 psi you'll increase flow by 24%.

Watching VE is only one step to ensuring the injectors will work. You need to look at the minimum IPW value in the calibration then watch to see if the commanded IPW on the ALDL is matching that value. If so then there's a good chance the injector is too big.

Mark, his injector constant would have to be reduced by almost 60%. That's a big adjustment.

[EagleMark]

Mark, his injector constant would have to be reduced by almost 60%. That's a big adjustment.

I didn't do the math but yeah that's pretty big. Glad I did cover my butt and said when 1project2many says something I listen... In the end correct injector size, correct fuel pressure, correct CID in calculater will give correct BPC to start tuning.

here's a list of TBI injectors, note some 4.3L came with 2 differant size injectors and I don't know the size of them when differant.
http://www.gearhead-efi.com/Fuel-Inj...d-part-numbers

[POZE]

I will replace the injector. Darn that was a new Delphi.
Should I buy the LeMans 1.6 injector? I know you mentioned several different ones.
I don't recall a minimum IPW in the calibration. What am I missing?
I prefer CL and a cat. The cat most likely won't happen.

[EagleMark]

I think 1project2many was giving examples on single barrel injector sizes because his pounds per hour are way off what we have in the injector specs which are all 2 barrel?
http://www.gearhead-efi.com/Fuel-Inj...d-part-numbers

2.8L and 3.1L are two barrel and have 33lb injector which might be closer to what your looking for and easier to find at JY, then service it for under $20 and your way cheaper then a new one, but from what he was saying closer to 59lb so one injector from a 5.7L 2 barrel is 61lb or 5.0L 50 pound...

I don't know your bore and stroke but was playing with the injector sizing BPW spreadsheet and looks like the 33lb at 14psi gives a BPW/BPC/IPW of 137 which is real close to stock BPW of these ECM.

[Six_Shooter]

Some of these pictures make me almost want to put a carb intake back on my 240Z, and run some modified flat top carbs I just got today.... almost.

[POZE]

I looked at the 2.8 and 3.1 injectors and they are the big size injector that will not fit my adapter. The LeMans injector might be the best choice. I think what I need is a 700 series injector to fit the adapter.
When I change the BPC what are the other required changes? BPC vs Vacuum, etc?
The bore is 2.9 and stroke is 3.44. Almost the stroke of a 350. I have heard these were tractor engines before they were MG engines.

[POZE]

The MG is 1978. I like the older chrome bumper cars better but this car came along and it's hard to find rust free original cars in northwest Ohio.
I know this looks like a mess under the hood oops no hood.mg pic 019.jpgmg pic 011.jpg