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GR Stumble Mod Fix: GD Style Setup (not hose extension)
GR Stumble Mod Fix: GD Style Setup (not hose extension)
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Old 06-08-15, 11:37 AM   #91
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

Quote:
Originally Posted by funks View Post
He added fuel dampers or removed them? Because the stock setup has two dampers and it stumbles. Removing em fix the issue with a tune.
scooby24 added two fuel dampers on an SH forester XT. I'm just surprised more people don't temporarily install a gauge to monitor the issue.
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Old 07-03-15, 04:30 PM   #92
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

Just an update - modified my setup to the following..

You need

1 foot of Vacuum Hose (1/4" Inner Diameter)
1/4 x 1/4 x 1/4 Vacuum T Fitting (Automotive Grade)
1/4 x 3/16 Reducer Fitting (Automotive Grade)
1/8 Vacuum Cap
Zip Ties

You can buy the items from your local AutoZone / Napa / OReilly's - less than 6$. Per Cobb the pressure source feeding the BPV is more consistent than the small nipple.

Fairly straight forward what needs to be done. Don't cut the hose feeding the BPV, hook it up to the T then add new hoses. Picture below is self explanatory..


Last edited by funks; 02-12-18 at 07:26 AM.
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Old 07-04-15, 08:53 AM   #93
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

Quote:
Originally Posted by funks View Post
Just an update - modified my setup to the following..

You need

1 foot of Vacuum Hose (1/4" Inner Diameter)
1/4 x 1/4 x 1/4 Vacuum T Fitting (Automotive Grade)
1/4 x 3/16 Reducer Fitting (Automotive Grade)
1/8 Vacuum Cap
Zip Ties

You can buy the items from your local AutoZone / Napa / OReilly's - less than 6$. Per Cobb the pressure source feeding the BPV is more consistent than the small nipple.

Fairly straight forward what needs to be done. Don't cut the hose feeding the BPV, hook it up to the T then add new hoses. Picture below is self explanatory..

Image Link
Will this work on a '15 STi post Stage 2+ or 3 tune? (not sure what model/mods you have)

Do you think it's necessary or will help with a stock tune? Because I'm probably a few months out on getting my parts and tune.
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Old 07-27-15, 06:36 PM   #94
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

i don't have a miserable stumble in mine - but still drives me nuts. im terrified to do this myself - looks scary.
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Old 07-27-15, 07:16 PM   #95
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

Quote:
Originally Posted by funks View Post
Just an update - modified my setup to the following..

You need

1 foot of Vacuum Hose (1/4" Inner Diameter)
1/4 x 1/4 x 1/4 Vacuum T Fitting (Automotive Grade)
1/4 x 3/16 Reducer Fitting (Automotive Grade)
1/8 Vacuum Cap
Zip Ties

You can buy the items from your local AutoZone / Napa / OReilly's - less than 6$. Per Cobb the pressure source feeding the BPV is more consistent than the small nipple.

Fairly straight forward what needs to be done. Don't cut the hose feeding the BPV, hook it up to the T then add new hoses. Picture below is self explanatory..

Image Link
FPR's are one of those things you really want to have on its own dedicated vacuum line without any other tee's off the line.
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Old 07-28-15, 04:46 PM   #96
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

Quote:
Originally Posted by yamahaSHO View Post
FPR's are one of those things you really want to have on its own dedicated vacuum line without any other tee's off the line.
Would you mind sharing the reasoning? I tried searching but was not able to find much. Your input is much appreciated.

I purchased the cobb version ($20 seemed fair given the R&D)...BUT it really didn't do a dam thing for me, just moved the stumble around in the RPM range. I should say that about 90% of my stumble has been resolved via Funks original kit with tuning. I was hoping that this fix could have resolved the last 10%. It did not.
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Old 08-22-15, 05:27 AM   #97
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

I have an 08 Sti that is about to receive a forged build, ID1000's and gtx3076r so I am going to move away from the extended fuel line mod and install a sard fuel pressure regulator. I have a fuel dampener to use as well if required but not sure of the best way to install it all.

I have read that some people just run a FPR and no dampener whereas others say the dampener is required.

Should the FPR be on the supply top line or the lower return line? I am thinking of a setup like the below picture. Thanks for your help.



My sard FPR.
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Old 09-06-15, 04:45 PM   #98
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

That thing looks purposeful
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Old 09-10-15, 04:18 PM   #99
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

Are the dampeners required in addition to a fuel pressure regulator and if so do you need one or two? I have seen examples of different combinations. My initial plan is to not run any dampener but if I have to then I will only run one.

If Murphy's law comes into play then I will have to buy another and run two....
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Old 09-10-15, 06:55 PM   #100
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Default Re: GR Stumble Mod Fix: GD Style Setup (not hose extension)

Quote:
Originally Posted by Kremer930 View Post
Are the dampeners required in addition to a fuel pressure regulator and if so do you need one or two? I have seen examples of different combinations. My initial plan is to not run any dampener but if I have to then I will only run one.

If Murphy's law comes into play then I will have to buy another and run two....
I've been told by a couple of tuning shops that a fpr will sufficient and no dampers are needed. The only exception that I've seen is if you are using hard lines instead of rubber.

Hope this helps.
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