Tweecer + FMU question

eschlenz said:

Last summer I upgraded my fuel pump to a 255LPH. I immediately noticed a drop in performance suggesting a rich condition. Hooking up some narrowband a/f gauges only convinced me further especially at WOT (I know I need to get a WB O2).

In my quest to tune this puppy, I've just purchased a spacer kit to change the FMU ratio. I've also purchased the Tweecer RT. I'm going to start by moving my FMU ratio down from 10:1 to 8:1. From that point forward I will be looking to the Tweecer to help me out.

I know I need to ditch the FMU and go with the injectors and MAF. But for now it stays ($$$).

Question 1: Pushing closer to 5 or 6 PSI (I'm at altitude), can I just ditch the FMU completely with my stock injectors (24#) and MAF? Or is that too much for the setup to handle.

Question 2: I've heard the Tweecer and FMU combo can be a pain. Has anyone had success with this combo?

Click to expand...

eschlenz said:

Thanks for the response. I figured running just the 24's might be too risky. I'm going to keep the "band-aid" FMU for now and make the injectors/MAF my next purchase. Then the WB, I just wish the WB's weren't so pricey.

Any suggestions on the size of injectors I should go with? I always hear people say go as big as possible to provide headway for future mods, especially with a Tweecer since it's tunable. But what is too big? If I had to guess I'd say 42# seem right???

Click to expand...