do i need to upgrade my fiel system for my setup?
#1
do i need to upgrade my fiel system for my setup?
Essentially I have...
S4 turbo II engine. but with s4 n/a higher compression rotors. no porting done.
stock s4 turbo. (I will be upgrading to a s5 stock turbo for better waste gate.. s4 turbo over boosts like crazy I can only give it half throttle. even spikes past 8 psi in 1st gear if I try going full throttle)
I have un-catted 2.5" exhaust from turbo back to a rear can
I have the factory 4 550 cc injectors and the s4 turbo II fuel pump.
I retarded the timing a couple degrees for safety and plugged in a boost cut defender
so my question is now knowing my setup should I have to upgrade my fuel system to support 8psi on this engine?
S4 turbo II engine. but with s4 n/a higher compression rotors. no porting done.
stock s4 turbo. (I will be upgrading to a s5 stock turbo for better waste gate.. s4 turbo over boosts like crazy I can only give it half throttle. even spikes past 8 psi in 1st gear if I try going full throttle)
I have un-catted 2.5" exhaust from turbo back to a rear can
I have the factory 4 550 cc injectors and the s4 turbo II fuel pump.
I retarded the timing a couple degrees for safety and plugged in a boost cut defender
so my question is now knowing my setup should I have to upgrade my fuel system to support 8psi on this engine?
#3
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firstly....why does it have high compression rotors in it? that will make you HAVE to run less boost.
for whichever turbo you chose, i still suggest you port the WG as much as you can without putting a new flapper on (if youre cheap). you need to tell us what PSI you are planning on running on average OR peak. are you going to be using a boost controller? what are your HP goals. if you are planning to port the WG and run stock ish boost with these mods, the stock injectors and fuel system should be fine.
for whichever turbo you chose, i still suggest you port the WG as much as you can without putting a new flapper on (if youre cheap). you need to tell us what PSI you are planning on running on average OR peak. are you going to be using a boost controller? what are your HP goals. if you are planning to port the WG and run stock ish boost with these mods, the stock injectors and fuel system should be fine.
#6
firstly....why does it have high compression rotors in it? that will make you HAVE to run less boost.
for whichever turbo you chose, i still suggest you port the WG as much as you can without putting a new flapper on (if youre cheap). you need to tell us what PSI you are planning on running on average OR peak. are you going to be using a boost controller? what are your HP goals. if you are planning to port the WG and run stock ish boost with these mods, the stock injectors and fuel system should be fine.
for whichever turbo you chose, i still suggest you port the WG as much as you can without putting a new flapper on (if youre cheap). you need to tell us what PSI you are planning on running on average OR peak. are you going to be using a boost controller? what are your HP goals. if you are planning to port the WG and run stock ish boost with these mods, the stock injectors and fuel system should be fine.
An s5 turbo's stock waste gate without modification will be adequate to maintain the >>>>8psi<<< I stated in the last sentence.
Last edited by R_PROWESS; 05-20-08 at 11:35 PM.
#9
Now seeing as how this reply had nothing to do with my question. Will someone please give me your input on what i actually asked about?
#10
King of the Loop
I say the only way to tell is to put it on a dyno/wideband and see if your leaning out. You may not even need to change your fuel system, maybe just a piggyback to add fuel in certain areas.
#12
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Essentially I have...
S4 turbo II engine. but with s4 n/a higher compression rotors. no porting done.
stock s4 turbo. (I will be upgrading to a s5 stock turbo for better waste gate.. s4 turbo over boosts like crazy I can only give it half throttle. even spikes past 8 psi in 1st gear if I try going full throttle)
S4 turbo II engine. but with s4 n/a higher compression rotors. no porting done.
stock s4 turbo. (I will be upgrading to a s5 stock turbo for better waste gate.. s4 turbo over boosts like crazy I can only give it half throttle. even spikes past 8 psi in 1st gear if I try going full throttle)
I have un-catted 2.5" exhaust from turbo back to a rear can
I have the factory 4 550 cc injectors and the s4 turbo II fuel pump.
I retarded the timing a couple degrees for safety and plugged in a boost cut defender
so my question is now knowing my setup should I have to upgrade my fuel system to support 8psi on this engine?
I have the factory 4 550 cc injectors and the s4 turbo II fuel pump.
I retarded the timing a couple degrees for safety and plugged in a boost cut defender
so my question is now knowing my setup should I have to upgrade my fuel system to support 8psi on this engine?
Best advice. If you don't have a wideband or dyno and have been running the car for a while on the street, pull the plugs and check for signs of detonation. Chipped or pock marked electrodes are a good indication.
#13
alright thanx guys i'll probably purchase a wide band. I'd need it in the future eventually anyway. Yes i could go a bit bigger on the s4 waste gate i know this. but the other reason I need a different turbo is because the hot side has a lot of blow by. every time im in boost I burn oil. which is another question.. can i salvage this turbo? is there a fix?
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