stock turbo on FC
#1
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stock turbo on FC
how much boost would you run on a stock turbo off of an FC. Mine is an 87 and i was thinking about a manual boost controller to put it up to 5.
p.s. how big is the stock turbo anyway?
p.s. how big is the stock turbo anyway?
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10 psi on a stock fuel system and stock exhaust? NOT a good idea - true, it's not as dangerous as a full exhaust and TID which will creep like mad, but you are making that turbo work SO hard to maintain that boost with a sock exhaust and that means extra heat and no turbo life...it's dangerous for the motor as well...it could blow at that boost on a fully stock car - fuel cut is 8.6 psi right?
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I was planning on a fuel upgrade:walbro pump, 500ccinjectors, and ......whatever else needs to be done. I figured it would be bad for the turbo. is the stock turbo a t25? i plan on replacing it or rebuilding it eventually. that and something along the lines of completely unrestrictive exhauste system(straight pipes). No inspections in OKlahoma.
#15
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Originally posted by Sleeper69
I was planning on a fuel upgrade:walbro pump, 500ccinjectors, and ......whatever else needs to be done. I figured it would be bad for the turbo. is the stock turbo a t25? i plan on replacing it or rebuilding it eventually. that and something along the lines of completely unrestrictive exhauste system(straight pipes). No inspections in OKlahoma.
I was planning on a fuel upgrade:walbro pump, 500ccinjectors, and ......whatever else needs to be done. I figured it would be bad for the turbo. is the stock turbo a t25? i plan on replacing it or rebuilding it eventually. that and something along the lines of completely unrestrictive exhauste system(straight pipes). No inspections in OKlahoma.
if you're going to run 10psi, here's what i would recommend MINIMUM.
- full exhaust
- intake
- 680cc or 720cc secondaries
- FD3S fuel pump or walbro 255
- FCD fuel cut defencer
- aftermarket boost gauge
- aftermarket air/fuel or EGT gauge
- S-AFC (optional)
- AVC-R (optional)
- aftermarket BOV (optional)
- porting the S4 turbo (optional)
good luck. dont blow the motor. like everyone said, you can run high boost, but your turbo wont last long and if you dont have more than enough fuel, neither will your engine.
- Kevin
#17
I break Diff mounts
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I'm doing a TII conversion and will have a 2.5 DP ro a 3inch CS single catback. Stock TID for now to keep boost down but I will make a TID to go with my Cold air box.
I'm figuring I will see 10psi with the intake and exhaust.
I will be upgrading fuel pumps in like a month or 2 when I build money up.
I've heard the 550 injectors can do 10 psi OK. I might go with 720's(hehehe Jrat) later on. I have to get the car runnning first.
The S4's are known to boost creep so I am porting the **** out of the waste gate to help this.
Now in my situation what would cause the Turbo to die like you said Jrat? Just the immense spinning of the turbines? I've heard the turbos' lose efficiency after 12-14psi.
Also what about the EGT and AF gauges?
Aren't they unreliabe and just for mild gauging of where the real stats are?Unless you have a Wideband O2 and so on?
I'm figuring I will see 10psi with the intake and exhaust.
I will be upgrading fuel pumps in like a month or 2 when I build money up.
I've heard the 550 injectors can do 10 psi OK. I might go with 720's(hehehe Jrat) later on. I have to get the car runnning first.
The S4's are known to boost creep so I am porting the **** out of the waste gate to help this.
Now in my situation what would cause the Turbo to die like you said Jrat? Just the immense spinning of the turbines? I've heard the turbos' lose efficiency after 12-14psi.
Also what about the EGT and AF gauges?
Aren't they unreliabe and just for mild gauging of where the real stats are?Unless you have a Wideband O2 and so on?
#18
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Originally posted by KenshinFC
500cc injectors? thats downgrading. stock is 550cc all the way across.
if you're going to run 10psi, here's what i would recommend MINIMUM.
- full exhaust
- intake
- 680cc or 720cc secondaries
- FD3S fuel pump or walbro 255
- FCD fuel cut defencer
- aftermarket boost gauge
- aftermarket air/fuel or EGT gauge
- S-AFC (optional)
- AVC-R (optional)
- aftermarket BOV (optional)
- porting the S4 turbo (optional)
good luck. dont blow the motor. like everyone said, you can run high boost, but your turbo wont last long and if you dont have more than enough fuel, neither will your engine.
- Kevin
500cc injectors? thats downgrading. stock is 550cc all the way across.
if you're going to run 10psi, here's what i would recommend MINIMUM.
- full exhaust
- intake
- 680cc or 720cc secondaries
- FD3S fuel pump or walbro 255
- FCD fuel cut defencer
- aftermarket boost gauge
- aftermarket air/fuel or EGT gauge
- S-AFC (optional)
- AVC-R (optional)
- aftermarket BOV (optional)
- porting the S4 turbo (optional)
good luck. dont blow the motor. like everyone said, you can run high boost, but your turbo wont last long and if you dont have more than enough fuel, neither will your engine.
- Kevin
Now I run 14-15 PSI with mods listed. But I am not really right in the head either.
Jarrett
#20
Originally posted by dragondwc777
I have been running 12psi of boost for over a year now no problem.
I have been running 12psi of boost for over a year now no problem.
#21
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Hmm - so I just got this stock S5 turbo & it's boost gauge was erratic as hell. Sometime it sort of works up to half scale, sometimes not.
Last week the pressure sensor failed all together.
I had bought an FCD from Shane (for future mods) so I installed it early just to keep the ECU from giving a check.
I remember having al old mil-spec aircraft absolute pressure gauge in a storage bin, so I dig it out & T it in.
HOLY CRAP! 8psi in 2nd, 10psi in 3rd, 10psi in 4th, with NO fuel, intake or exhaust mods.
The waste gate seems to be working at 10psi.
It gets to 10psi by 3500 & just stays at 10.
So - should I be happy or worried?
Last week the pressure sensor failed all together.
I had bought an FCD from Shane (for future mods) so I installed it early just to keep the ECU from giving a check.
I remember having al old mil-spec aircraft absolute pressure gauge in a storage bin, so I dig it out & T it in.
HOLY CRAP! 8psi in 2nd, 10psi in 3rd, 10psi in 4th, with NO fuel, intake or exhaust mods.
The waste gate seems to be working at 10psi.
It gets to 10psi by 3500 & just stays at 10.
So - should I be happy or worried?
#22
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Originally posted by RotaryRevn
How big is your wastegate ported? Is it just as big as the stock flapper allows?
How big is your wastegate ported? Is it just as big as the stock flapper allows?
#23
Originally posted by dragondwc777
Yeah the flapper is still covering the hole. I drilled out as much as I could, you can barely see light coming through around the flapper door. It seems to be working out ok for me.
Yeah the flapper is still covering the hole. I drilled out as much as I could, you can barely see light coming through around the flapper door. It seems to be working out ok for me.
Here's a before pic
and after I ported it
#24
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Listen to J-rat he knows what he is talking about. I only had Detonation problems at 14 psi on a stock turbo with a stock fuel system. My Apex-i AFC and Wahlbro Pump helped out a lot but I will be getting 4x720cc.
alwase go overkill on your fuel system and you can tune it down with a AFC.
I was running 12psi on stock fuel and I was fine. Try to stay at 10 for the turb's sake.
BTW, your boost controler will hardly afect the boost after 5k with a stock waste gate, I creep to 14.5psi
alwase go overkill on your fuel system and you can tune it down with a AFC.
I was running 12psi on stock fuel and I was fine. Try to stay at 10 for the turb's sake.
BTW, your boost controler will hardly afect the boost after 5k with a stock waste gate, I creep to 14.5psi
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