IllRad Posted May 2, 2017 Share Posted May 2, 2017 Try the sti fpr mod and tee the fpr vacuum into the bpv hose. I had this same issue and the fpr mod cleared it up. Hopefully it helps you out. Sent from my LGLS755 using Tapatalk Link to comment Share on other sites More sharing options...
FJuan Posted May 2, 2017 Share Posted May 2, 2017 Try the sti fpr mod and tee the fpr vacuum into the bpv hose. I had this same issue and the fpr mod cleared it up. Hopefully it helps you out. Sent from my LGLS755 using Tapatalk For your 1st post you nailed it! This was the simple trick that I didn't explained in my last post. I "T" my BPV hose to the FPR and it fixed the problem. But since the OP has mods, it could be related to one of the 2 links I posted. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
Slammed05 Posted May 2, 2017 Author Share Posted May 2, 2017 Hmm, I'll have to look into this fpr "mod" I have cam across it, but only saw the 300 dollar Cobb kit Link to comment Share on other sites More sharing options...
Slammed05 Posted May 2, 2017 Author Share Posted May 2, 2017 I know they say the Cobb fpr mod needs a tune, but does the sti fpr mod need one as well? Link to comment Share on other sites More sharing options...
FJuan Posted May 2, 2017 Share Posted May 2, 2017 No, you shouldn't need a tune. You might want to check out convertrussian's thread since he piece together a FPR kit for less than $100. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
Slammed05 Posted May 2, 2017 Author Share Posted May 2, 2017 Link? I couldn't find anything when searching for the fpr mod Link to comment Share on other sites More sharing options...
Slammed05 Posted May 3, 2017 Author Share Posted May 3, 2017 Also would Ting into the bpv line, while my boost gauge is Ted onto the same line effect anything? Should I look into another vac line to t it into, see if maybe that helps at all? Link to comment Share on other sites More sharing options...
FJuan Posted May 3, 2017 Share Posted May 3, 2017 The most common fix is to "T" off the bpv and place the hose on the small vacuum line on the lower part of the FPR. You could "T" off the bpv or the boost gauge hose, as long as you have some sort of pressure going to the FPR. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
awfulwaffle Posted May 3, 2017 Share Posted May 3, 2017 Yep, neither the FPR or the boost gauge should require any significant volumetric flow to work right. Just enough air to move the diaphragm and sensing element. Link to comment Share on other sites More sharing options...
BigTDogg MA Posted May 3, 2017 Share Posted May 3, 2017 Link? I couldn't find anything when searching for the fpr mod FJuan posted the link to the FPR mod. It helped my hesitation, but it was just hesitation, not completely slamming into a wall. My TB was the wall. See the difference below, these graphs should be identical: Link to comment Share on other sites More sharing options...
FJuan Posted May 3, 2017 Share Posted May 3, 2017 FJuan posted the link to the FPR mod. It helped my hesitation, but it was just hesitation, not completely slamming into a wall. My TB was the wall. See the difference below, these graphs should be identical: It's a starting point since he has some mods, once corrected then he may need a retune. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
Slammed05 Posted May 3, 2017 Author Share Posted May 3, 2017 I'm going to try and t my fpr into the bpv vac line and see if that helps anything I'm trying to find a local that already has a cable and can log any data for me Link to comment Share on other sites More sharing options...
Slammed05 Posted May 3, 2017 Author Share Posted May 3, 2017 What's the theory on tapping into a different vac line changing anything with the fpr? I notice that mine is tapped directly into a nipple on one of the runners on the intake manifold? Link to comment Share on other sites More sharing options...
IllRad Posted May 3, 2017 Share Posted May 3, 2017 Run your boost gauge off the intake manifold nipple that the factory fpr is in, then T the fpr into the bpv. Idk if you can run both off the bpv. A good trick to try is to just T the factory fpr into the bpv. Run that for a few days and see if it's still stumbling. Sent from my LGLS755 using Tapatalk Link to comment Share on other sites More sharing options...
Slammed05 Posted May 3, 2017 Author Share Posted May 3, 2017 Yea that was my plan, I'll just run my boost gauge off the nipple that the fpr is tapped into now, and the run the fpr vac line into the bpv line and see if there's any change Link to comment Share on other sites More sharing options...
IllRad Posted May 3, 2017 Share Posted May 3, 2017 http://legacygt.com/forums/showthread.php/famous-stumble-fixedi-232816.html I read this post about 4 times before I did it. In the last few pages you'll see what I was talking about in my last comment. If that helps the stumble, the fpr will really help. Sent from my LGLS755 using Tapatalk Link to comment Share on other sites More sharing options...
IllRad Posted May 3, 2017 Share Posted May 3, 2017 Yea that was my plan, I'll just run my boost gauge off the nipple that the fpr is tapped into now, and the run the fpr vac line into the bpv line and see if there's any change Sounds good. Let us know how things go! Sent from my LGLS755 using Tapatalk Link to comment Share on other sites More sharing options...
Slammed05 Posted May 3, 2017 Author Share Posted May 3, 2017 So just swapped the vac lines and took it for a spin, hard to say, it was pretty much gone, maybe very very slightly still there, but I didn't reset the ecu so idk if that really mattered or not with some vacuum related One thing I did notice, and maybe it's just the placebo effect of me swapping the lines, but it looked as if my Wideband read a lot more clearly, wasn't bouncing all around, almost like it was more stable, but again don't really know what that would effect just swapping vac lines around Link to comment Share on other sites More sharing options...
IllRad Posted May 3, 2017 Share Posted May 3, 2017 So just swapped the vac lines and took it for a spin, hard to say, it was pretty much gone, maybe very very slightly still there, but I didn't reset the ecu so idk if that really mattered or not with some vacuum related One thing I did notice, and maybe it's just the placebo effect of me swapping the lines, but it looked as if my Wideband read a lot more clearly, wasn't bouncing all around, almost like it was more stable, but again don't really know what that would effect just swapping vac lines around Nice sounds like its working. I didnt reset my ecu either. Mine only does it on cold starts and I drive right away. Sent from my LGLS755 using Tapatalk Link to comment Share on other sites More sharing options...
IllRad Posted May 3, 2017 Share Posted May 3, 2017 Idk the exact science behind swapping the lines around either, but if it works then I'm not complaining. Lol Sent from my LGLS755 using Tapatalk Link to comment Share on other sites More sharing options...
Slammed05 Posted May 4, 2017 Author Share Posted May 4, 2017 Definitely made it a lot better at least in the 2 days, I bought a sti fpr and I'll do that mod as well car feels a lot better Link to comment Share on other sites More sharing options...
IllRad Posted May 4, 2017 Share Posted May 4, 2017 Definitely made it a lot better at least in the 2 days, I bought a sti fpr and I'll do that mod as well car feels a lot better Nice. After I did the install, it did stumble for a day or two, but eventually went away. My guess is that changing the lines etc caused an air bubble. Sent from my LGLS755 using Tapatalk Link to comment Share on other sites More sharing options...
solidxsnake Posted May 4, 2017 Share Posted May 4, 2017 Nice. After I did the install, it did stumble for a day or two, but eventually went away. My guess is that changing the lines etc caused an air bubble. Sent from my LGLS755 using Tapatalk An air bubble in your fuel lines would probably disappear during cranking. More likely your fuel trims were adjusting to the different fuel supply from the regulator mod. Link to comment Share on other sites More sharing options...
IllRad Posted May 4, 2017 Share Posted May 4, 2017 An air bubble in your fuel lines would probably disappear during cranking. More likely your fuel trims were adjusting to the different fuel supply from the regulator mod. Ahhh okay. Sorry I'm still a noob... Sent from my LGLS755 using Tapatalk Link to comment Share on other sites More sharing options...
FJuan Posted May 5, 2017 Share Posted May 5, 2017 I wouldn't say it's air in the lines, it usually takes a few starts for the ECU to relearn the fuel trims. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
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