boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost..
05-30-2005, 06:44 PM
#1
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boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost..
I have a .4bar spring in it, which is like 6.4psi. Holds steady in 1st, 2nd, 3rd gear after VTEC it will creep to 8-9psi, 4th gear is real bad, creeps to 10-11-12. Its very consistant with the creeping too, which sucks ***.
Setup:
t3/t4 garret
OBX ramhorm ---this damn thing even tho its a bootleg of full race should not make any difference
Tial 40mm WG with atmospheric side exit
3in downpipe ran open downpipe
My tuner says its the manifold, flows so well it kinda bypasses the WG, a larger WG might do the trick. Also the 3" DP ran open DP is the other issue (no backpressure)
Anyone think if i ran a fulltime 3" exhuast all the out the back with no fart cannon, im talking pure 3" all the way baby. Think that might help reduce the creepage? Anyone else have any ideas/thoughts/comments?
lastly, i might be building an engine, at higher boost levels does this same **** occur? Or not really since the WG doesnt have to work as much?
Setup:
t3/t4 garret
OBX ramhorm ---this damn thing even tho its a bootleg of full race should not make any difference
Tial 40mm WG with atmospheric side exit
3in downpipe ran open downpipe
My tuner says its the manifold, flows so well it kinda bypasses the WG, a larger WG might do the trick. Also the 3" DP ran open DP is the other issue (no backpressure)
Anyone think if i ran a fulltime 3" exhuast all the out the back with no fart cannon, im talking pure 3" all the way baby. Think that might help reduce the creepage? Anyone else have any ideas/thoughts/comments?
lastly, i might be building an engine, at higher boost levels does this same **** occur? Or not really since the WG doesnt have to work as much?
05-30-2005, 06:45 PM
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (Ls1 FD3s)
its the manifold... you could try a larger wg, but im pretty sure it wont help much
05-30-2005, 06:52 PM
#3
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (Ls1 FD3s)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ls1 FD3s »</TD></TR><TR><TD CLASS="quote"> Tial 40mm WG with atmospheric side exit
</TD></TR></TABLE>
i dont think your manifold is the problem...........what do you mean by atmospheric side exit? i think you may have your vaccum lines hooked up wrong on the wastegate.
</TD></TR></TABLE>
i dont think your manifold is the problem...........what do you mean by atmospheric side exit? i think you may have your vaccum lines hooked up wrong on the wastegate.
05-30-2005, 06:53 PM
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (wantboost)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wantboost »</TD></TR><TR><TD CLASS="quote">its the manifold... you could try a larger wg, but im pretty sure it wont help much</TD></TR></TABLE>
how do u figure? the wg placement is central. I love bandwagons.
how do u figure? the wg placement is central. I love bandwagons.
05-30-2005, 06:56 PM
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (Boostage)
lol, this isnt a bandwagon, its physics and its ture with everymani from fullrace to obx, i wasnt referring to the fact that its obx.
The wg is exactly 90* to the exhaust flow, when the exhaust gasses are hauling *** through the mani (technical terms, dont you love it) they dont really want to slow down and turn 90* to be bypassed around the turbine. If the flange was recut and angled at about 45* or less, the exhaust gasses would be more willing to flow through the wg
The wg is exactly 90* to the exhaust flow, when the exhaust gasses are hauling *** through the mani (technical terms, dont you love it) they dont really want to slow down and turn 90* to be bypassed around the turbine. If the flange was recut and angled at about 45* or less, the exhaust gasses would be more willing to flow through the wg
05-30-2005, 07:29 PM
#6
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (wantboost)
what Wantboost speaketh makes sense and pretty much was my conclusion too. When VTEC hits it jumps 2-3PSI, aka exhaust gasses bypassing the WG port. At low speeds it holds boost like a champ. Anything above 6500 is risky. At the same time however,,, i have a y-cutout setup for my exhaust. Except i reversed it and have the wing nut cap on the straight through part and the side that spurs off is 2.5" exhaust all the way out. When i have the cutout closed, its a turd, but holds steady boost at 6.5psi or whatever boost level i select with the boost controller. Its on open DP (when i open the cutout) when i get this creep issue badly (sorry if i wasnt more specific on my setup) Thats why i think maybe a fulltime 3" exhaust might help a wee bit.
As for the atmospheric WG dump, some kits (very few) plumb the WG exhaust back into the downpipe, i have mine firing out the side of my front bumper. Wasnt sure if that could be an issue, so i made mention of it...
As for the atmospheric WG dump, some kits (very few) plumb the WG exhaust back into the downpipe, i have mine firing out the side of my front bumper. Wasnt sure if that could be an issue, so i made mention of it...
05-30-2005, 08:02 PM
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05-30-2005, 08:14 PM
#9
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (project dc2)
What problems>? TOo big per setup? too small per setup? Awkward sizing has this mysterious goemetry that has issues with 1.6-1.8L honda engines? LOL 
05-30-2005, 08:17 PM
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (Ls1 FD3s)
reqally big valve, plus big diaphram = slow reaction time
05-30-2005, 08:33 PM
#11
Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (wantboost)
if you do a search there is a few threads on this already.
The problem is the manifold design and not the wastegate, people are creeping with 38's 40's and 44's.
The problem is the manifold design and not the wastegate, people are creeping with 38's 40's and 44's.
05-30-2005, 08:45 PM
#12
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (newgsr)
has anyone dared to cut the WG tube/flange off and have it re-welded to a 45* angle?
Reduce any creep issues?
Reduce any creep issues?
05-30-2005, 08:47 PM
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (Ls1 FD3s)
jordo ended up having a mani made so he could run two 44mm tials... apparently it worked, it stopped the creep. hes also selling the two tials and the mani, lol
05-30-2005, 09:50 PM
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (Ls1 FD3s)
no, he spent almost 3k to stop the creep. his mani worked, it doesnt creep anymore
05-30-2005, 09:56 PM
#16
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (wantboost)
ya i just tracked down that thread, ***** intense. Tall $$ tho. I might try something crazy with setting that WG at a 45* angle.
Will the **** still creep at 18psi? Cuz at that point the WG isnt open all that much as compared to 6.5 PSI., maybe that has an effect on the creep issue? Just a thought, i dont know. lol.
Will the **** still creep at 18psi? Cuz at that point the WG isnt open all that much as compared to 6.5 PSI., maybe that has an effect on the creep issue? Just a thought, i dont know. lol.
05-31-2005, 01:29 AM
#18
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (project dc2)
what manifold? open 3" dp? 3" to 2.5? Has to be some other variables that make it work for you.
05-31-2005, 09:04 AM
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (Ls1 FD3s)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ls1 FD3s »</TD></TR><TR><TD CLASS="quote">what manifold? open 3" dp? 3" to 2.5? Has to be some other variables that make it work for you.</TD></TR></TABLE>
FR style made by me. 3" dp 3" exhaust.
FR style made by me. 3" dp 3" exhaust.
05-31-2005, 09:49 AM
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Re: boost creep issues, tial 40mm WG, OBX ramhorn mani, wont hold steady boost.. (project dc2)
ill be using a 38mm wg on my 500+ whp build. probably go with a mini-me stule mani tho
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