how much boost is too much boost on a stock ported engine??
07-29-11, 10:05 AM
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how much boost is too much boost on a stock ported engine??
any thoughts...stock ported engine...single turbo....how much can i push...i have the fuel delivery to back boost....nut HOW MUCH??
07-29-11, 03:06 PM
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it depends on too much stuff to just throw out numbers... anything over 12psi on CA pump gas you need to kind of know what you're doing, anything over 15 and you REALLY need to have your stuff together.
thing like air intake temps, coolant and oil temps, spark plugs, etc, etc,etc
detonation and preignition are your worries, if you ran some crazy race fuel, like E85, or C16 or something you can almost run as much boost as you want.
CA gas though is unstable and crappy
thing like air intake temps, coolant and oil temps, spark plugs, etc, etc,etc
detonation and preignition are your worries, if you ran some crazy race fuel, like E85, or C16 or something you can almost run as much boost as you want.
CA gas though is unstable and crappy
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07-29-11, 08:55 PM
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i have done 25psi with w/i on stock ports (13bre).
thats was around 450rwhp,another guy i know went 550rwhp on 25psi on stock 13bre.
the more stock the block the more boost u need to make big power.go for it.
thats was around 450rwhp,another guy i know went 550rwhp on 25psi on stock 13bre.
the more stock the block the more boost u need to make big power.go for it.
07-30-11, 10:12 AM
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If so, you should give yourself more credit
To the OP: What is boost? Temperature? Density? Mass flow?
Much to learn....
07-30-11, 11:57 AM
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how about some specs on your set up. i sure as hell hope your not using the stock turbo.
what year motor is this?
the stock ports are going to restrict your air flow so if your running 20psi it's not going to make the power and thus will be more reliable then someone with a bridge port running 20psi. again this is assuming everything else is up to par for high boost.
my only real concern would be the type of motor and the apex seals it has and if the oil pump still can produce sufficient pressure to stop you from contacting a bearing.
what year motor is this?
the stock ports are going to restrict your air flow so if your running 20psi it's not going to make the power and thus will be more reliable then someone with a bridge port running 20psi. again this is assuming everything else is up to par for high boost.
my only real concern would be the type of motor and the apex seals it has and if the oil pump still can produce sufficient pressure to stop you from contacting a bearing.
07-30-11, 02:00 PM
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07-31-11, 03:47 PM
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Yeah I did 450rwhp on 3 piece seals and killed the engine due to lean out combined with too much timing, the engine otherwise was unopened 13bre with 52000km on it.
Were it not for me pushing it so hard on maxed fuel system it would of been reliable. It had 128psi on all chambers and when it let go it still had 128psi on the good rotor. On disassembly the apex seals had excellent wear rates and would have went for years at that power
Were it not for me pushing it so hard on maxed fuel system it would of been reliable. It had 128psi on all chambers and when it let go it still had 128psi on the good rotor. On disassembly the apex seals had excellent wear rates and would have went for years at that power
07-31-11, 03:50 PM
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07-31-11, 05:14 PM
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aight well.....basically stock internals as far as i can tell....HD coolant seals...put em in myself.....stock primarys....1600cc secondaries......adjustable fpr....255 fuel pump....single turbo....oversized stock mount....twin power ignition...9's all the way around on plugs.....pfc...datalogit...rmp....titanium exhaust....and yea...californa's best 91 shitty octane...anything im missing.....also have some serious idle issues lately....just got a new iat sensor....tps sensor....and dashpot ...cuz mine was stuck....and my idle hunts like a champ..
07-31-11, 07:45 PM
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aight well.....basically stock internals as far as i can tell....HD coolant seals...put em in myself.....stock primarys....1600cc secondaries......adjustable fpr....255 fuel pump....single turbo....oversized stock mount....twin power ignition...9's all the way around on plugs.....pfc...datalogit...rmp....titanium exhaust....and yea...californa's best 91 shitty octane...anything im missing.....also have some serious idle issues lately....just got a new iat sensor....tps sensor....and dashpot ...cuz mine was stuck....and my idle hunts like a champ..
since you said stock mount and not top mount along with the powerFC i'm going to assume this is an FD 13b-rew... what size turbo exactly? you have heavy duty coolant o-rings? so i'm again going to assume this is a fresh built motor. so if it was done right it should be as reliable as it gets. so your limiting factor will most likely turbo size and that fuel pump.
turbo boost
07-31-11, 11:19 PM
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91 octane is your limiting factor. Play it safe run 15-17. If you had a bigger fuel pump and race gas, then I would o for low/mid 20s if the turbo will handle it. But your really limited with that gas. A lot of it comes down to monitoring knock. If you have a good tuner, he will use a wide band knock sensor with seperate standalone software for monitoring it and they can do really good tuning with that equipment.
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08-02-11, 10:30 PM
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IMO, actual boost numbers are irrelevant, it is easier to gauge "how much whp is too much on a stock ported engine." There are just too many variables with saying "x" psi.
25psi on stock twins vs 25psi on a GT4202 are two completely different ball games. Just my .02c
25psi on stock twins vs 25psi on a GT4202 are two completely different ball games. Just my .02c
