safe boost!
#1
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safe boost!
ok . i have 87 turbo II with Atkins rebulit motor (3000miles) with 3in dp,exhaust. and looking to get a turbo XS manual boost conrtoller and push to 8 psi....
and is it possilbe to push 8psi with out any fuel upgrade?? if not how much boost i should push ???
and is it possilbe to push 8psi with out any fuel upgrade?? if not how much boost i should push ???
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Yup. Lots of posts and websites on FCD's (Fuel Cut defenders)... do a search you'll find how to make them yourself or where to buy them. And, you have an S4. First thing you should do for that poor turbo is port the wastegate.
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where is the wastegate located at(sorry stupid ?, but i dont have a turbo 2 yet and id like to do this. also how much at a reg. machine shop...my dads a machinist but he lives 3 hours away)
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Originally posted by DigitalSynthesis
Yup. Lots of posts and websites on FCD's (Fuel Cut defenders)... do a search you'll find how to make them yourself or where to buy them. And, you have an S4. First thing you should do for that poor turbo is port the wastegate.
Yup. Lots of posts and websites on FCD's (Fuel Cut defenders)... do a search you'll find how to make them yourself or where to buy them. And, you have an S4. First thing you should do for that poor turbo is port the wastegate.
but is it rebulit turbo help??? cause i have rebuilt turbo also
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When you remove the turbo, there is a 1/2" thick cast iron plate that the DP bolted to. Under there is the wastegate. All you have to do is make the hole bigger. You might have to take the turbine housing off to keep metal from getting to the bushings inside. There is no way of knowing if the rebuilt turbo has a ported wastegate or not without looking. Measure the ID of the hole. I think the stock ones are like 5/8" abouts.
Boosting to 8 won't hurt the turbo. I've heard they're good up to like 16 or so. I'm quite surprised that you aren't hitting fuel cut. All I have is an intake and gutted cat and I'm all over fuel cut. You may already have a ported wastegate.
Boosting to 8 won't hurt the turbo. I've heard they're good up to like 16 or so. I'm quite surprised that you aren't hitting fuel cut. All I have is an intake and gutted cat and I'm all over fuel cut. You may already have a ported wastegate.
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also, it's not a matter of how much boost you run that determines whether or not it is safe. it's how much horsepower you have. The stock fuel system can only support so much hp. You can have 16psi if you want, as long as you don't go over 250hp.
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ive read from ppl having 10psi with no problems...save up some money and buy a walbro 255lph fuel pump....if ur planning on going higher get larger injectors...but ppl with 10 psi on stock injectors and pump say they have no problems...just get teh fcd
#13
What other mods are on your car? The stock fuel cut on a s4 Turbo 2 is 7.5 psi. The first thing I did when I got my completely stock T2 was install a boost gauge. I then found out I was hitting fuel cut @ 7.5 psi because my exhaust was so rusted out.
8 psi would be fine without any fuel UPGRADES. just make sure you fuel system is operating at is stock potential.
8 psi would be fine without any fuel UPGRADES. just make sure you fuel system is operating at is stock potential.
#14
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Originally posted by 1badT2
no. i will do that soon as i get boost controller
no. i will do that soon as i get boost controller
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Originally posted by 13bpower
What other mods are on your car? The stock fuel cut on a s4 Turbo 2 is 7.5 psi. The first thing I did when I got my completely stock T2 was install a boost gauge. I then found out I was hitting fuel cut @ 7.5 psi because my exhaust was so rusted out.
8 psi would be fine without any fuel UPGRADES. just make sure you fuel system is operating at is stock potential.
What other mods are on your car? The stock fuel cut on a s4 Turbo 2 is 7.5 psi. The first thing I did when I got my completely stock T2 was install a boost gauge. I then found out I was hitting fuel cut @ 7.5 psi because my exhaust was so rusted out.
8 psi would be fine without any fuel UPGRADES. just make sure you fuel system is operating at is stock potential.
but is S4 stock fuel cut on 7.5? i thought was 8.6?
Last edited by 1badT2; 01-02-04 at 12:21 PM.
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i guess 8.6 is S5 fuel cut. i was wondering why i'm cutting around 7.5. i though my guage was off. ha oh well, learn something everyday. the first thing i bought for my car was the walbro 255. i have like new injectors and a rewire now. i think 12psi is nearing the 250hp limit on stock fuel system. RC said not to go over like 255 with my stock injectors. going by that, i'm going to get 720's soon for the secondaries just to be safe when i do my exhaust.
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i aslo learn someting everyday to.. my rx7 and english (i been USA for almost 4 years ha ha.. im trying my best to type)
ok how hard to take stock injectors off ??
ok how hard to take stock injectors off ??
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Originally posted by 1badT2
i aslo learn someting everyday to.. my rx7 and english (i been USA for almost 4 years ha ha.. im trying my best to type)
ok how hard to take stock injectors off ??
i aslo learn someting everyday to.. my rx7 and english (i been USA for almost 4 years ha ha.. im trying my best to type)
ok how hard to take stock injectors off ??
#24
My experience with 3" downpipe, fuel cut defenser:
1) waste gate MUST be ported to eliminate boost creep.
2) do not exceed 10 psi EVER with stock fuel system, but even that is not really safe. Above 8.5 psi you should be adding fuel.
3) porting as shown in the attached photo is good enough to hold the boost below 10 psi except on cold days. Only the small hole is enlarged, and the flap has been relieved to allow it to open a bit more. The hole needs to be enlarged concentric with the flap, not with the original hole. This maintains a uniform sealing surface.
4) beware of cold days, or fuel tank below 1/4 when driving aggressively, and 5th gear (where creep is worst).
5) at the first sign of knocking, back off and change your plugs. Expect plug life of 1500 to 2000 miles.
6) my stock pump was good for 60 psi, which should be good enough for 10 psi boost. To be safe install a 255 lph pump if you install a rising rate fuel pressure regulator.
1) waste gate MUST be ported to eliminate boost creep.
2) do not exceed 10 psi EVER with stock fuel system, but even that is not really safe. Above 8.5 psi you should be adding fuel.
3) porting as shown in the attached photo is good enough to hold the boost below 10 psi except on cold days. Only the small hole is enlarged, and the flap has been relieved to allow it to open a bit more. The hole needs to be enlarged concentric with the flap, not with the original hole. This maintains a uniform sealing surface.
4) beware of cold days, or fuel tank below 1/4 when driving aggressively, and 5th gear (where creep is worst).
5) at the first sign of knocking, back off and change your plugs. Expect plug life of 1500 to 2000 miles.
6) my stock pump was good for 60 psi, which should be good enough for 10 psi boost. To be safe install a 255 lph pump if you install a rising rate fuel pressure regulator.