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fuel cutoff question


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23 replies to this topic

#1 mitch184

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Posted 04 November 2003 - 10:20 PM

ive got an 87 turbowagon w/ hot wire maf and am putting an intercooler and blowoff valve on it. I am planning on "fooling" the wastegate by adding springs to it to get the boost up to 11-13 psi. i was wondering what the easiest way to get the boost while avoiding the fuel cut off dilemna. I searched past posts but couldnt find a general consensus.

#2 calebz

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Posted 04 November 2003 - 10:23 PM

Manual boost controller is the easiest way to up boost.. unfortunately, the fuel cut off hits around 9psi and can only be bypassed electronically by building a circuit to fool the ECU

#3 mitch184

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Posted 04 November 2003 - 10:26 PM

i am just starting to get into turbos but where exactly does the manual boost controller hookup? Is there any set way of bypassing the electronic fuel cutoff or is it trial and error?

#4 calebz

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Posted 04 November 2003 - 11:03 PM

Look for info from Skip in this thread

#5 xforxlifex

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Posted 04 November 2003 - 11:17 PM

so whats the best most efective way on an 89 and up ea82t

#6 calebz

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Posted 05 November 2003 - 12:53 AM

Look for info from Skip in this thread!

#7 Scrub2k

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Posted 05 November 2003 - 03:07 AM

LOL Caleb, xforxlifex Basically Right now Noone(that i know of) has an Effective way of bypassing it, Im Running My Car at 12-13psi and i rarely hit the fuel cut.
Once I get the tranny in my car im hoping to do some R&D and try to come up with my own way of bypassing the fuel cut, Sorry that there isent much help as of yet but your not the only one waiting for some answers.

Off Topic: Caleb i Finished your MBC I Will Send it Out Tomorrow Morning Before i goto work :D :burnout: :drunk:

#8 xforxlifex

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Posted 05 November 2003 - 11:44 AM

Thanks for the help scrub. But i have heard of people using the HKS fuel cut defender on some subarus from this gen.

#9 xforxlifex

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Posted 05 November 2003 - 11:47 AM

Originally posted by calebz
Look for info from Skip in this thread!



Whats your point? I read that thread the first time it was posted and it didnt help. So no need to get all BOLD on me now!

#10 Scrub2k

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Posted 05 November 2003 - 02:00 PM

The HKS is the Same thing that Other People have done and ive read about people using that also, but not getting efficent or effective results, the subarus just dont agree with having this system bypassed, this is one system designed by subaru that they dident want us to get around, but i say give it a try and let us know what kind of results that you get.

#11 rallyruss

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Posted 05 November 2003 - 03:34 PM

I have an intercooler W/ down pipe and a bypass (not a blow off) valve. without altering stock boost settings I have had significant gains in power with these mods alone. It does over boost sometimes when I wind it out but it just makes it go faster I hit over 15 LBS sometimes with no fuel cut. mabey its just my car .

manuel boost cotroller goes inline with the actuator on the turbo waste gate.

I used a bypass valve because it was recomeneded by others on the board over a blow off valve.

boost on

#12 mitch184

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Posted 05 November 2003 - 04:40 PM

what exactly is the difference between the blow off and bypass valves? i am slso confused with their exact purpose. sorry like i said im just getting into turbos. thanks

#13 rallyruss

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Posted 05 November 2003 - 05:14 PM

when you release the throttle they dump excess boost pressure. the turbo is still pumping air even when you close the throttle causing some stress on the turbo and throttle plate. there is a diaphram to minimize this efect from the factory.

BOV dumps to the atmosphere ( the ecu thinks it burned that air)
bypass dumps into the intake side of the turbo creating a loop to let the turbo keep spinning.

BOV is the high HP solution but the others work too.

#14 mitch184

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Posted 05 November 2003 - 05:24 PM

i was wondering what intercooler and bypass valve you are using? Is there a setup where i can take the i/c and bypass off the same car or do i piece it together like the i/c off a saab and the bypass valve off of a volvo?

#15 pleiades

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Posted 05 November 2003 - 07:20 PM

http://www.teamfc3s....fcd/diy_fcd.htm

#16 xforxlifex

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Posted 05 November 2003 - 11:03 PM

Interesting, have u tried this?

mike

#17 rallyruss

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Posted 05 November 2003 - 11:10 PM

mitch the intercooler is Off a 1.8t jetta as well as the bypass valve. the valve makes a bit of noise when it starts to dump. I call it the hooter valve:D . its starting to bug me a bit. odd comp from the old site had pics of my set up posted but I dont have the contact info any more. WRX intercoolers fit well too and they have a real nice stock bypass valve.

pleiades interesting thought on the boost trickery. I am not sure how it would work on our subes though. they think differantly than a mazda system. you still would have to work out a fuel enrichment plan.

I have a complete stand alone fuel system that I just removed from my truck. something like that would be the best way to go.

#18 xforxlifex

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Posted 05 November 2003 - 11:32 PM

Out of curiosity where did u find the jetta intercooler? Junk yard or bought brand new. I want to fit an intercooler on my rx but im still trying to get as much info as i possibly can about fitting and plumbing before hand. Did u experience any issues with the intercooler? also is it top mount or front mount?

#19 rallyruss

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Posted 06 November 2003 - 12:18 AM

http://users.adelphi...mp/turboroo.htm

I was a VW guy from the very start. so when my VW buddy needed his new front mount intercooler installed I got his old parts:banana: yeah I will work for just about anything.

ok issues are, it sits really high requiring a custom made fiberglass hood scoop. if you decide to go this way I can make a mold of my current scoop and form a new one for a small fee.
hood scoop is NOT centered. that bothers some people.

plumbing was not horibly dificult but I keep telling myself that I will weld up a nice replacement for that home depot special on top of the throttle body. the one from the turbo up had to reduce and offset in a verry short space. a little tricky to make. and yeah the bypass valve is plumbed a little cheesy for my taste.

I have a ford probe intercooler too but It would need to be modified a little to work properly. FS cheap:brow:

#20 pleiades

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Posted 06 November 2003 - 04:20 PM

Originally posted by xforxlifex
Interesting, have u tried this?

mike



No I just found it by doing a search on this message board. ;) lol.....

When I saw this thread I knew I had seen something about this before. It was subarutex who originally posted a link to it. Here's the thread:

http://usmb.ultimate...highlight=13psi

#21 mitch184

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Posted 06 November 2003 - 09:26 PM

so with the bypass valve, the released air would be sent back into the intake. but would it be into the intake before or after the MAF. If after, would that let you boost higher than 9 psi. without hitting the fuel cut off? just a thought.

#22 WJM

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Posted 10 January 2005 - 08:46 PM

http://www.teamfc3s....fcd/diy_fcd.htm


Bump for that....

has any built one yet?

#23 WJM

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Posted 23 January 2005 - 07:00 PM

Check this out:
http://www.graphics....ell.edu/~v/fcd/

#24 rallyruss

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Posted 24 January 2005 - 12:34 AM

so with the bypass valve, the released air would be sent back into the intake. but would it be into the intake before or after the MAF. If after, would that let you boost higher than 9 psi. without hitting the fuel cut off? just a thought.


huh?

no

it plumbs in after MAF




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