ok i tried searching but couldn't find anything. just got my car running nd the vcum to boost transition is very bad i have 440's at 25 psi.it hesitates real bad going into boost. and i don't know what could be the problem any help would be great. thanks in advance
#86635, "RE: vacumto boost transition?" In response to Reply # 5 Jun-06-05 11:45 AM by CarbonFiberRST
Mine is really bad if I just floor it while cruising at 3k or above. I have to get on it gently until a few pounds of boost then I can floor it, I guess its because the boost hits faster than than the fuel, it just kinda hesitates and the exhaust pops... You just have to deal with it I guess... one of the many limitations of using the sfmu...
Evo 8 - 12.3@113 circa 2009 (~330whp) Now with BB Xona Rotor HTZ FP Red and ~450whp 2018 MSM Civic SI Ktuner TSP stage 1 w/ Honda hacked headunit.
#86639, "RE: vacum to boost transition?" In response to Reply # 6
well that's just something i don'twant to have to just deal with! there has to be some type of solution to this. besides a ms or 8-injector setup. someone please help!!
#86644, "RE: vacum to boost transition?" In response to Reply # 7
Well you'll never get rid of it, thats why hahn advertises a seemless transistion into boost with the portfueler... but maybe someone will give you some tips, I don't know of any, sorry.
Evo 8 - 12.3@113 circa 2009 (~330whp) Now with BB Xona Rotor HTZ FP Red and ~450whp 2018 MSM Civic SI Ktuner TSP stage 1 w/ Honda hacked headunit.
#86646, "RE: vacumto boost transition?" In response to Reply # 6
Originally posted by CarbonFiberRST Mine is really bad if I just floor it while cruising at 3k or above. I have to get on it gently until a few pounds of boost then I can floor it, I guess its because the boost hits faster than than the fuel, it just kinda hesitates and the exhaust pops... You just have to deal with it I guess... one of the many limitations of using the sfmu...
This is the same problem I'm having w/ no solution to the problem on the post I made. The reason it's doing that is because your running real rich at 0 psi, BEFORE the turbo boosts. So it's backfiring from the unspent fuel outside of the exhaust ports. I didn't get a restrictor w/ my sfmu, so I'm going to splice in a welding tip which will probably help.
Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician
#86650, "RE: vacumto boost transition?" In response to Reply # 10 Jun-06-05 06:56 PM by CarbonFiberRST
I got a restrictor but I didn't install it, whats the proper way? small end toward vac source? That is what someone posted but it makes more sense imo to have the big end toward the source so the air can have a smooth transition inside the restrictor instead of the air hitting the blunt side of it and then haveing to go through the small hole... i dunno.
Evo 8 - 12.3@113 circa 2009 (~330whp) Now with BB Xona Rotor HTZ FP Red and ~450whp 2018 MSM Civic SI Ktuner TSP stage 1 w/ Honda hacked headunit.
#86653, "RE: vacumto boost transition?" In response to Reply # 12 Jun-06-05 08:28 PM by ner947
A different FPR restrictor won't do anything to help the shady vacuum/boost transition that some people have. Sometimes a Missing Link can fix the problem, and sometimes a simple voltage clamp like the adjustable Shit Shack 3 wire unit or the HRC/STAR 2 wire unit will work. I needed both in order for my car to be somewhat drivable, but it wasn't perfectly smooth until I built an ECU which can actually deal with boost pressure.
#86656, "RE: vacumto boost transition?" In response to Reply # 13 Jun-07-05 12:24 AM by WickedESi
I don't have any restrictor though. I'm sure Vortech includes them for a reason (which I didn't get because I bought my sfmu used). It might lag the sfmu long enough for the turbo to already be spooled.
Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician
#86684, "RE: vacumto boost transition?" In response to Reply # 15
Make your own electronic one (The site is here somewhere) I had the ML and I had the same problem (among others) After I built that thing no more ruff transition. I had mine set for about 4.5v if I remeber correctly. (BTW a monkey could make one!)
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