Choices, choices
Mark,
About 20 months ago I bought a set of 40 pound green stripe injectors and two REDS chips (with 500 miles on them).
The new combination ran well in my TTA with a stock turbo and D-5, but burned extremely rich (O-2's 800-900+mv at WOT) at 7000 feet elevation, even with AFPR turned down. I didn't like the black soot under the tail pipe in the garage, and wanted to pass emissions too. So, I went back to stock until I found a set of 50's, they were the rave at the time.
I sold the 40 pounders and the chips at a small loss (manufacturer rated at 40 pounds per hour, but actually tested closer to 38 pounds per hour by guys I respected on the board-I think that is why they are known as 38# injectors here on the board.)
The 50 pounders are a much better choice for our mild performance goals/upgrades, in my view. Razor has chips that work for 50 pounders. Also, the MAF extender and translator works great with them. The extender and translator might work well with the 38 pounders too. I don't know if TurboBob has an extender for the 38's or not. If he does, I'm sure he's nailed the parameters down and it will work well for you.
The things I like best about the Extender and translator combination -aside from easy tunability- are the $$ savings of running a stock FPR at 45 psi and the reduced need/dependance on a larger fuel pump over stock (bigger opening in the injector requires less pressure to get the same volume of fuel, compared to a smaller injector openeing -remember, I'm thinking only mild MOds, not full out racing here)
The combination with the greatest potential (for us looking for modest upgrades and performance) is prolly the 57 pounders with the extender and translator plus. If TurboBob is making an extender for the 57 pounders, thats the way I'd go.
Only regret (NOT intended as a flame here
![Smile :) :)](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png)
) is the extender version with the "fast frame rate" does NOT give you Malfunction codes. The multiple reports of the TPS, O2 and KR in the "fast rate" version are revealing and VERY useful in tuning. If I had it to do over, I'd get ahold of TurboBob and have him make a chip that sent Malf codes instead of Prom ID in my "fast rate" extender chip. I don't need the prom ID reported every second....I can write the prom ID on the chip
![Wink ;) ;)](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png)
and tell Turbolink which chip I'm using....I'm sending RAZOR a check this week for a chip to install when I want to check the Malfunction codes
HTH
Leeb