INURGRL951

Well if you are using no standalone system and trying to get plenty of HP out of a stock injector to do it safely use a Digital FMU. When you get the figures in there that you need it will hold you evenly all threw the rev range by raising fuel pressure in reference to boost. It is not an item that I think is necessary if running bigger injectors,EMS and heavily mods. It's just an thing to get the stocker to get more efficient with other things it just ONE more variable that you have to get right and with an EMS it kinda gets canceled out!

Raceboy

Why do you think it will be problem getting good idle with 3litre engine and 4 cylinders? There's muc more cylinder displacement per injector and I can tell you that it's much easier to get 1000cc injectors idle perfectly on 3.0 4cyl than 2.2l 5cyl engine.

Our 98 is the same as US 93 octane.

INURGRL951

I'm running Bosch 160lbs injectors on a 2.5 and have a great idle warm/cold/hot just as user friendly as stock form. What I have noticed using big injectors there is no need to go bigger then like a stage 2 massair. The only time where there is a idle problem with a big injector car is the fact that when it comes down off of a high rev fast and the voltage drops down too low across the massair causing it to stall. If you look at what the 8v head is capable of there is no need to go bigger then a stage 2 massair thats where the idle problem is at ot the injectors.....my 0.02

333pg333

The 1600cc inj we had were thoroughly tested and showed very poor performance on low pressure to simulate idle. More of a dribble than any atomisation. However we have been pointed in the direction of a better quality and more recent technology inj so hopefully this will prove to be ok. On the E85 there will be no problem. We are looking at least 5bar fpr. The builder wanted to run higher. 1600cc is pretty big for a 4 cylinder motor but it's been done before. I hope to have some good news perhaps next week.

333pg333

Good point Costas. That's one of the issues we're concerned about too. Stalling on backoff. That is exacerbated with light components too I believe. Knife crank, lite rods, lite pistons, lite fly... etc

V2Rocket

max boost will probably be achieved below 3000RPM...

INURGRL951

Yes Patrick that helps check on all the things you just listed and a lightweight clutch setup also my car is centered around response the 50mph-120mph for road courses my top speed been brought down to (gear limited to 163mph with all race cut and harden gears. At 60 mph im tack'n 3000rpm's . It's not the large injector that is the issue it's the voltage drop off throttle that causes the stall for tracking you will not have a problem. excessive tuning and no bigger like i said then a stage 2 massair you will be fine mine is a daily driver and I don't really in need of the injectors other then dyno'n it at high boost. My car stays at around 17-19lbs on a regular.

V2Rocket

are the stock injectors 36lb/hr at 2.5bar or 3bar?

Raceboy

They are 36lbs at 2.5bar, I already mentioned that too earlier in this topic

fast951

The stock injectors are more like 36.x lbs at 3bar

V2Rocket

okidokey