turboimpala

iTrader: (4)

Ok me and Tom have been fighting this issue for about a week now and i need a little help. For some reason when running my FIC 1450cc injectors the car will go lean whenever it sees boost and just start chugging.

Ok so i went back to my PTE 1000 injectors and the car ran fine we were able to tune it no problems.

So ordered a brand new set of 1450s and guess what still does the same freaking thing. I cant even tell you how many different ROMs we have tried and nothing fixes it. Im starting to highly doubt its in the tune almost sure it is not. But why do the PTE 1000 run fine?

The cars mods are
Built 2.0 10:1
kelford 272 cams
port polished head with super tech valve springs
double pumper
E85
AMS fuel rail

Thats all the important mods i can think of. Any help would be great as this problem is killing me.

turboimpala

iTrader: (4)

I forgot to add this on speed density running a Omni 4 bar.

turboimpala

iTrader: (4)

Figured out the problem. Apparently the 1450s go static at anything over 80psi of fuel pressure. So everytime my second pump was kicking in apparently I was seeing over 80lbs. Unhooked the second pump and it's running fine. Now here is the kicker do I need to go buy an adjustable fpr? Or is there another way to fix it.

turboimpala

iTrader: (4)

bump I'm going to replace the stock fpr with another stock fpr. Anyone have any other ideas why the car cuts fuel when the second pump kicks in?

turboimpala

iTrader: (4)

Well just replaced the regulator and it's still doing it. As soon as the 2nd pump kicks in it feels like the injectors turn off. If I run one pump the car runs fine and can run 33 psi.

evoyrrah

iTrader: (2)

My cars doin the same thing.....how did you solve it? I've got a 340l pump, stock rail, stock reg on fic 1450s and as soon as it hits 25psi it's like the injectors turn off.....any ideas?

JohnBradley

iTrader: (30)

Is it at low boost like 1-6psi?

evoyrrah

iTrader: (2)

Na more like as soon as it hits like 20-25psi

n2oiroc

iTrader: (33)

sell the 1450's and buy the high impedence 1680's or 2150's. the consensus is...... they are trouble.

JohnBradley

iTrader: (30)

Any large injector will do this. It has so much head pressure it cant open against the lack of boost. When you really need 80psi of fuel pressure (i.e. 40psi of boost) you have 40psi of air on the other side of the nozzle so its still more or less at 40psi fuel pressure.