boost creep fix
#51
Moderator
iTrader: (14)
Re: boost creep fix
I have done a lot of research on this especially reading through the Supra and Evo Forums (those guys are recirculating crazy) I have addressed to my fabricator that a 45 degree merge is not sufficient enough for this and he already knew. I will post pics when he gets to that part...
Reading through the forums it sounds like a properly merged recirculation will actually act like a vacuum and pull the exhaust gasses out the back of the car faster...
Couple questions were asked I didnt answer: Boost controller will be neptune boost by gear and the 6265 is 82ar
Reading through the forums it sounds like a properly merged recirculation will actually act like a vacuum and pull the exhaust gasses out the back of the car faster...
Couple questions were asked I didnt answer: Boost controller will be neptune boost by gear and the 6265 is 82ar
#52
Honda-Tech Member
Thread Starter
Re: boost creep fix
Muckman- I will get traction in my car with 7.5 psi in 1st gear... Toyo RA1s are no joke... i may get an AMS boost controller if i am not happy with it...
#54
Honda-Tech Member
Thread Starter
Re: boost creep fix
im running a 225 50 15 but i cant imagine that makes a huge difference... ill assume you have lsd, traction bar, and good suspension and all that as well right?
ill just wait to see i guess...
ill just wait to see i guess...
#55
Honda-Tech Member
Re: boost creep fix
An EVO and a honda are completly different. Your theories and readings are not 1:1. Just like your engine efficiency with your .82 A/R housing. lol
I'd recommend you open up the housing and stop choking you're engine.
I'd recommend you open up the housing and stop choking you're engine.
#56
Honda-Tech Member
Thread Starter
Re: boost creep fix
im confused... what exactly is your point? are you trying to insult me or something?
#59
Honda-Tech Member
Thread Starter
Re: boost creep fix
with the small blue spring in the wastegate... 5.5psi... i am seeing boost creep up to 15psi... its worse than before with the 44mm gate...
something is not right...
i have all the vacuum lines properly setup however the dual boost solenoids are NOT wired in... i am only testing the wastegate boost level...
the car is on a street tune (matt shue) so no ignition timing has been adjusted but i am a little confused...
i am going to test a manual boost controller and see what that does...
something is not right...
i have all the vacuum lines properly setup however the dual boost solenoids are NOT wired in... i am only testing the wastegate boost level...
the car is on a street tune (matt shue) so no ignition timing has been adjusted but i am a little confused...
i am going to test a manual boost controller and see what that does...
#60
Honda-Tech Member
Re: boost creep fix
Well that sucks. Where is your boost reference line to the bottom of wg being fed from? Compressor housing?
Also, if no timing has been thrown at it yet, advancing it should help kill some creep. Of course you have to keep an eye on the plugs for signs of detonation. 4* was enough to knock my creep down, but the plugs showed signs of detonation. 3.5* did nothing for the creep. :/
Hope this isn't a case of the 60mm valve actually becoming a restriction. That's kinda what I want to lean towards due to your creep being worse now than it was with the 44mm.
Is the gate's entry just butt welded to the mani's collector? Or is there a bit inside the collector to act as a scoop?
Also, if no timing has been thrown at it yet, advancing it should help kill some creep. Of course you have to keep an eye on the plugs for signs of detonation. 4* was enough to knock my creep down, but the plugs showed signs of detonation. 3.5* did nothing for the creep. :/
Hope this isn't a case of the 60mm valve actually becoming a restriction. That's kinda what I want to lean towards due to your creep being worse now than it was with the 44mm.
Is the gate's entry just butt welded to the mani's collector? Or is there a bit inside the collector to act as a scoop?
#61
Honda-Tech Member
Thread Starter
Re: boost creep fix
I think it is timing... The timing is the same as what the car was on 93 pump gas... im now running e85 LOL... i need to get this thing on the dyno...
The elbow is the same size as the opening...
The elbow is the same size as the opening...
#62
Honda-Tech Member
Thread Starter
Re: boost creep fix
https://honda-tech.com/forums/forced-induction-16/diagnostic-general-discussion-using-twin-boost-solenoids-3018483/
Tony the Tigers diagram (post 21) is exactly how my dual solenoids and wastegate are plumbed.
Tony the Tigers diagram (post 21) is exactly how my dual solenoids and wastegate are plumbed.
#63
Honda-Tech Member
Re: boost creep fix
Ah, so they're plumbed and hooked up to the top wg port already, but not wired to the ecu yet? If so, I'd try removing the line from the top of the gate.
Yea, you def gotta get on that dyno! The timing alone could very well solve your creep problems entirely. That would be sweet!
Yea, you def gotta get on that dyno! The timing alone could very well solve your creep problems entirely. That would be sweet!
#64
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Re: boost creep fix
Delsolmarine, i was also having issues with boost creep. In my case it was the wastegate valve getting slack. If you can, take off your gate and pressure test it and make sure it's working properly. Mine was opening but not staying open, so it would creep like hell. In other words, with a compressor hooked up to the side port (top port vented to make sure nothing was restricting it) and a valve sending a constant 20 psi at the gate, it would pop open then lose pressure and the gate would close. So you can see on a turbo system how that would make boost creep.
Solution: Take gate apart and make sure everything is tightened and sealed properly and no leaky diaphram. Make sure you can't turn you valve left or right by hand. If you can, you have a problem. Make sure the valve is being held securely in place by the four hex screws at the top of the diaphram cover. Make sure that when pressure is applied to the side port that it pops open and stays open.
Solution: Take gate apart and make sure everything is tightened and sealed properly and no leaky diaphram. Make sure you can't turn you valve left or right by hand. If you can, you have a problem. Make sure the valve is being held securely in place by the four hex screws at the top of the diaphram cover. Make sure that when pressure is applied to the side port that it pops open and stays open.
#66
Honda-Tech Member
Thread Starter
Re: boost creep fix
car held 6psi to 9000 RPMS...
what was wrong....
i am a dumb *** and had the top and side port backwards... sorry for being dumb lol
what was wrong....
i am a dumb *** and had the top and side port backwards... sorry for being dumb lol
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#67
Honda-Tech Member
Re: boost creep fix
#68
Re: boost creep fix
I appreciate everyones input, I think i am just going to cut off the 38mm flange and weld in a 44mm direct flange for my wastegate and hope for the best
with the additional input on the power losses of a dumptube... i think im going to debate on this further to see if its worth it... i am looking for ways to reduce sound so that is a huge reason why as well as reducing the horrid smells from up front... what an increase in diameter of the dumptube benefit me more and locate it further down to the bottom of the oil pan to recirculate?
with the additional input on the power losses of a dumptube... i think im going to debate on this further to see if its worth it... i am looking for ways to reduce sound so that is a huge reason why as well as reducing the horrid smells from up front... what an increase in diameter of the dumptube benefit me more and locate it further down to the bottom of the oil pan to recirculate?
Does cutting 38mm flange and rewelding 44mm flange fix the boost creep? Cause im having the same problem right now. I have 5psi spring on my 44mm wastegate but my manifold has 2bolt 38mm flange and i put 38mm to 44mm vband adapter. And hold 5 psi and creeps to 12 psi when vtec kicks.
#69
Re: boost creep fix
Does cutting 38mm flange and rewelding 44mm flange fix the boost creep? Cause im having the same problem right now. I have 5psi spring on my 44mm wastegate but my manifold has 2bolt 38mm flange and i put 38mm to 44mm vband adapter. And hold 5 psi and creeps to 12 psi when vtec kicks.
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