jpldude

So I replaced the fuel pump as I was losing pressure under boost. Now the pressure is good. But the waste gate actuator does not seem to be working. The boost just ramps up even tho I have my manual boost controller set to what should be basically no boost. If I remove the actuator how would you recommend testing it? Also, what sort of mileage do you think I can expect? Also, if the EGO correction is running then at boost what keeps it from pushing the AFR back to 14:1 after a few seconds?

My fuel pump is suspect and I want to get a new one. I was running a stock 280zx turbo pump that I got at the wrecking yard. I have a 260z turbo setup with 300 cc/min injectors and megasquirt and spark. Anyone know of some economical pumps that I can get to replace this one?

What is involved in moving from MS&Spark to MS&Spark Extra? Just curious.

checked the fuel filter and it is clear. It seems like it must either be either the fuel lines or the fuel pump. any comments on how I can effectively test these parts with the least effort/complicated setup.

alright. I bought a fuel pressure guage and installed it. When we hit about 3lbs of boost the pressure drops from around 38psi to 17psi. Any idea what might cause this sort of thing? I remember reading something about the fuel feed and return line setup. I was just using the original pipes. Would this cause these sorts of symptoms? Also, how can I test if my used 280zx turbo fuel pump is not working properly?

So it doesn't seem like the fuel pressure regulator would cause the sort of problem I am experiencing. Does anyone know why I would suddenly have fuel supply problems when I start boosting...even at just a couple pounds. The fuel pump is out of a 280zx turbo.

I went out to tune last night on a relatively flat stretch of highway, but I came up against something that I could use some help on. I can tune it just fine as long as I keep my foot out of it and it never boosts. As soon as we get a couple pounds of boost it goes way lean and even tho the injector opening time is goes up alot. So I was thinking that I may have messed up somewhere in my setup. Specifically, I think I have a stock NA FI fuel pressure regulator ( the silver thing on the fuel rail ). Would it dramatically cut fuel pressure under boost? Should I have found one off a turbo car or something? thanks for any input.

Moby, So I am pretty sure my injectors are 300 cc/min and I am running a setup more or less based on your sticky. Should I be running decent from your example VE, Spark, constansts, etc? If my injectors are 300 cc/min are they the same as the stock ones? (Please bear with me this is one of the few areas I am not entirely sure about, I do understand most everything going on in the system) Also, can someone please confirm if the wideband O2 sensor should be sorta jumping around all the time? I would have thought that they would filter the output from it to give a more steady reading for easier understanding. Anyone who can comment on any of this I would really appreciate it. Even more exciting is if there is someone with experience in the LA area that can help me tune. thanks for any help.

Yeah I have read this about a dozen time and unfortunately still get lost.

hi, I have a 260Z that i am currently running megasquirt and spark and a t3/t4 turbo and all the neccessary support components and i have also just installed a broadband o2 sensor and the car runs and drives smoothly. It appears to be running rich all the time and the boost seems to be coming in rather late and when it does come it doesn't seem to be producing the type of power I was expecting. So, I guess what I'm asking for is some methodology/precedures that will aide me in tuning my vehicle and getting some more power out of it. thank you in advance for help.