Rep Power: 299

i recently bought the comp stage two turbo cam and a tubo xs boost controller and i am wondering if i need to upgrade the fuel system. i want to run about ten psi and i currently have rsx type s injectors. i am wondering though if i will run out of fuel when i boost hard. i have heard i could get away with the injectors through ten psi but i dont know if this is true or not. any help would be great.

 
Rep Power: 327

maybe maybe not, 10 psi is not the same on all turbos! 10psi on a t25 could possible run rsx injectors on stock fuel system with rsx injectors(with piggy back) But 10 psi on a GT40R im pretty sure the stock fuel system wouldnt be able to meet the demand I would suggest you try it and make sure to have a wideband to make sure you dont lean out. would be even easy to watch it with a fuel pressure guage on a dyno.

 
Rep Power: 350

Depends on alot more than your turbo. Depends on how agressive your tune is. Of course the turbo will play a part in it. But it depends on how much power you plan to make with that 10 psi. I'd say you should choose a rough horsepower number to gauge other than how much boost pressure. If you know how much power you want to make and how much fuel pressure you're planning on running, use a BSFC of 60-65 and click the link in my sig for injector sizing. There's a formula that helps figure out what the proper size injectors you should use are.

Also, try making sure that you don't exceed 80% duty cycle on the injector. Anything higher than that can cause inconsistant spray patterns and flutters which can lean out and break things.

And this has been covered before.

 
Rep Power: 299

thanks guys
will the cam affect the fuel decesion in any way?
i am shoting for about 210 or 220hp.
turbo is a garrett 24mm? ( i will have to look again and check this, it is the turbo that comes with the tsi kits.)

 
Rep Power: 293

I used to run 10 psi on my rsx injectors with greddy emanage. It was fine until i would floor it. I blew two headgaskets in two races. I am pretty sure they max out like around 8 but like andyman said its about your tune pretty much but good luck

 
Rep Power: 350

^ I promise you didn't blow your headgasket because your injectors couldn't supply the fuel if you were running 310's.....

 
Rep Power: 293

so then you think my tune was worth ****?

 
Rep Power: 350

Click the link in my sig that says Tuning/Detonation Info. I think it definitely has something to do with your tune.

 
Rep Power: 607

rsx-s injectors will safely work for up to 225whp. What are you using to control them ???


I agree, I have been running 8-10 psi daily for almost 2 years and about 25,000 miles. My motor is completely stock, including injectors and i am still on my stock HG. I floor mine quite a bit while getting onto the interstate from exit ramps and i have run 10psi for more than 30 seconds and i still have no problems. I am not saying that there isn't damage done to my bottom end but so far nothing has broken.

 
Rep Power: 293

so both of you guys do you think it was my tune or boost spikes or what?

 
Rep Power: 607

It is possible, do you have a graph ??

 
Rep Power: 350

Why guess? If you have to ask why you're blowing a headgasket, it's clear that you aren't dyno tuned. My suggestion is to get on the dyno and get someone who knows how to tune to set you up before you run any more boost.

 
Rep Power: 293

My car was dyno tuned and it was tuned pretty good but i don't know if i had a boost spike or something because it was fine for like a month then one day i floored it and it felt weird i looked down and the temp gauge was going up so i put it away and changed the headgasket

 
Rep Power: 350

It could have been a boost spike. Are you internally gated? What are you using for boost control? Engine management? Without being able to see what your car is doing on the dyno, it's hard to know. What are your egt's like?

 
Rep Power: 293

Yes internally gated. Greddy e-01 and Emanage. Thats what i was running when it happened. Now i am Internally gated with e-01 and Ems

 
Rep Power: 299

GReddy e-manage.
.....but like i was asking too, will the cam affect the fuel equation any?

 
Rep Power: 327

It will effect the tune, yes.

 
Rep Power: 299

oh i am sure it will affect the tune but i guess it will not create a greater strain on the fuel system right?

 
Rep Power: 327

It depends on if the tuen will require more fuel or not