How to deal with boost creep.
03-19-05, 05:05 PM
#1
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How to deal with boost creep.
Hey guys,
I really want to run a DP and MP on my Tii, but i'm worried about boost creep. and since i have an S4 it is even worse. how ever i got a great idea yesterday, until i upgrade my turbo and mani to a ported s5, could i run with a silencer in my n1 exhaust. would this reduce flow enough to keep boost creep at a controllable level with a 2.5in dp and mp and a 3in exhaust? thanks
I really want to run a DP and MP on my Tii, but i'm worried about boost creep. and since i have an S4 it is even worse. how ever i got a great idea yesterday, until i upgrade my turbo and mani to a ported s5, could i run with a silencer in my n1 exhaust. would this reduce flow enough to keep boost creep at a controllable level with a 2.5in dp and mp and a 3in exhaust? thanks
03-19-05, 10:03 PM
#2
Do you already have the silencer? I've heard that it really depends on what you put in... Like, some silencers restrict the airflow more than others. I bet if you got a super ghetto E-bay silencer you'd stifle your exhaust flow a bit...
If you have the silencer, just try it and find out.
Honestly though, I think the only way you can *really* stop boost creep is by porting your WG. I did this a couple months ago and it wasn't too difficult. The biggest hassle would probably be removing the turbo to get to the WG. After it's removed you could probably be done porting it in about an hour or so (if you've got the right tools).
Don't be intimidated by the turbo removal, it's not too difficult. You take off the DP, remove the accesories on the front of your motor, remove the 4 turbo to exhaust mani. bolts, the 2 oil lines, coolant line, BOV etc. then just ease the turbo out through the front of the engine bay... I don't know, good luck.
P.S: what psi are you boosting to?
If you have the silencer, just try it and find out.
Honestly though, I think the only way you can *really* stop boost creep is by porting your WG. I did this a couple months ago and it wasn't too difficult. The biggest hassle would probably be removing the turbo to get to the WG. After it's removed you could probably be done porting it in about an hour or so (if you've got the right tools).
Don't be intimidated by the turbo removal, it's not too difficult. You take off the DP, remove the accesories on the front of your motor, remove the 4 turbo to exhaust mani. bolts, the 2 oil lines, coolant line, BOV etc. then just ease the turbo out through the front of the engine bay... I don't know, good luck.
P.S: what psi are you boosting to?
03-19-05, 10:11 PM
#3
Originally Posted by eriksseven
Do you already have the silencer? I've heard that it really depends on what you put in... Like, some silencers restrict the airflow more than others. I bet if you got a super ghetto E-bay silencer you'd stifle your exhaust flow a bit...
ebay silencers are mostly glasspacks like the mufflers, straight through and often are cheap but flow better than good quality ones, just because they are cheap don't assume they flow like crap. my $200 exhaust is loud as hell and flows probably better than most exhaust systems out there, usually you compromise sound quility with air flow so most quieter/deeper exhausts flow worse than cheap *** setups. don't get me wrong, the difference is hardly noticable in the power differences though. a catalytic converter is the best restrictor and muffler you can put on.
for the poster of the thread: don't assume a S5 turbo will cure the problem either, the wastegate on both series turbos is too small to accomodate most any modifications to intake and exhaust flow. porting the wastegate is your only option to cure boost creep.
Last edited by RotaryEvolution; 03-19-05 at 10:16 PM.
03-19-05, 10:22 PM
#4
Originally Posted by Karack
ebay silencers are mostly glasspacks like the mufflers, straight through and often are cheap but flow better than good quality ones, just because they are cheap don't assume they flow like crap. my $200 exhaust is loud as hell and flows probably better than most exhaust systems out there, usually you compromise sound quility with air flow so most quieter/deeper exhausts flow worse than cheap *** setups. don't get me wrong, the difference is hardly noticable in the power differences though. a catalytic converter is the best restrictor and muffler you can put on.
for the poster of the thread: don't assume a S5 turbo will cure the problem either, the wastegate on both series turbos is too small to accomodate most any modifications to intake and exhaust flow. porting the wastegate is your only option to cure boost creep.
for the poster of the thread: don't assume a S5 turbo will cure the problem either, the wastegate on both series turbos is too small to accomodate most any modifications to intake and exhaust flow. porting the wastegate is your only option to cure boost creep.
second he said he was going to port the S5 turbo
my opinion... I don't think it would work that well but you should be fine. I was boosting upwards of 17 psi before I ported mine, and my motor is fine
(I did blow my turbo though, but that was also due to a kinked coolant line)karack you need to read posts better
-Myk
03-19-05, 10:51 PM
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Originally Posted by Aznplayer911
would this reduce flow enough to keep boost creep at a controllable level with a 2.5in dp and mp and a 3in exhaust?
Why don't you just upgrade your turbo system first? No offense, but it seems pretty dumb to go thorugh all the work and expense of upgrading the exhaust, only to plug it up so it acts like your old exhaust.
03-19-05, 11:41 PM
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how ever i got a great idea yesterday, until i upgrade my turbo and mani to a ported s5
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03-20-05, 02:48 AM
#9
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I have no problem with boost creep and I'm running a S4 T2 with a 80 mm dp & a corksport 80 mm midpipe going to a single - resonator - muffler- muffler with a stock flapper ported wastgate. BNR hybrids run 25 mm wastegates. Its louder than my RB turbo back.
03-22-05, 05:21 AM
#10
I'm a boost creep...
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Originally Posted by Aznplayer911
I really want to run a DP and MP on my Tii, but i'm worried about boost creep. and since i have an S4 it is even worse.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/serious-s4-wastegate-porting%85-343788/
Originally Posted by Evil Aviator
...it seems pretty dumb to go thorugh all the work and expense of upgrading the exhaust, only to plug it up so it acts like your old exhaust.
03-22-05, 10:31 AM
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Originally Posted by RexRyder
its true
03-22-05, 10:49 AM
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This is my way to overcome creep and over-boosting.
http://www.slcrotary.com/driftedfc/B...o_Swap/WG2.JPG
http://www.slcrotary.com/driftedfc/B...o_Swap/WG2.JPG
03-22-05, 01:01 PM
#17
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Check out the archieves for NZConvertable's post regarding wastegate porting. I've done something very similar, I welded two washers on top of each other onto the stock flapper. I have a ~35mm wastegate port and there's zero creep. I have a fairly unrestrictive 2.5" exhaust and 3" TID.
03-22-05, 01:10 PM
#18
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damn thanks for the good info guys. ok i'll do it right and port my wastegate. but just incase. would a S5 Turbo flow better? if i used the stock s4 mani?
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