YakATK

Alright. Just wondering about some safe boost levels here.

Engine will be the following:
IC moved to FMIC, Cone Filter Intake, 3inch straight pipe exhaust, Walbro fuel pump, stock injectors.

This is for a S4 Turbo engine with around 170,000km on it (I think). How much boost is still safe for that fuel system with the mods listed? Would it be safe to be around 10psi? Would be getting boost controller ASAP for it and gauge and stuff.

Also, anyone know what kind of HP that would be putting out on stock 8psi boost?

Thanks for info.

BDC

Don't go over 10psi. You've made some nice changes, but the bottom-line is this -- The stock EFI system is still in place. Anything over fuel cut boost is not good to do. It's the same classic problem all of us FC owners have had for years and years. I blew two engines because of being stubborne on this point and running FCD's so don't do it.

8psi, using your stuff, oughta net you around high 190's to 210 to the wheels I'd suspect.

B

darkwaveboi

if you have an SAFC you can go up there (10ish psi), but with that S4 turbo be VERY VERY careful to watch your boost EVERYTIME you floor it. Also, if your injectors havent been cleaned ever, your not flowing 550cc's.

One time i hit 1.5 bar on stock injectors for about .3 seconds before i let off immediately and freaked the **** outta myself (s4 turbo). Port your wastegate...it'll take 1/8 the amount of time then a rebuild and only about 30 bux in carbide bits

dr0x

You should beable to do 9 easily. Maybe 10. Dont go any higher though.

YakATK

Awesome, thanks for the replys guys. I have not done any of this yet, don't even have the engine yet...but very good chance of getting the full engine+driveline+ ALL electrical so the swap is more then likely gonna happen. And those are what my mods would be instantly....so nothing over 10psi then.....thats fine with me....thanks alot guys.

darkwaveboi

much easier said then done

dr0x

When you get the new motor remember to properly break it in and no synthetic oil for 1000 miles

J-Rat

iTrader: (2)

I am going 10, course im not right in the head either.

Jarrett

jeyjey

I boost 12 psi with my mods no problems

gsracer

I've been boosting 10-12 pounds for nearly a year with just the walbro. Guess I like playing with fire :shrug:

ERAUMAZDA

Got boost? 10 is good with an AFC and Man-boost control 10-12 is good.

BDC

You do now, but little do you realize that you're firing both leading and trailing spark too far advanced under heavier loads as well as not maintaining a proper air/fuel ratio because the ECU is getting incorrect data with respect to the amount of mass air flowing through the engine.

Been there, done it, blew engines in the process; I was doing this 6 years ago in my car. Listen to me on this topic, guys. I know what I'm talking about.

B

bcty

lock the distributor.. dont worry about the advance..

Scott 89t2

ummm.... it's not the advancing that is the problem. it's the lack of retarding

jon88se

u said lack of retarding (hehe, shut up beavis)

jeyjey

hmmm realy you had something wrong then .... I did a race through europe last year 3500 miles in 7 days no problems apart from the police in switzerland