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??

hahahaha "but" not "nut "

17psi

maybe 20psi if you run race fuel

Thanks mang...16 it is

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

ask mr wood chuck!

There are guys pushing well over 30psi on a stock motor and ports IF you have everything needed!

The ports have nothing to do with it. Don't throw out random numbers unless you have experience to back it up guys ;)

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.

stock ports on a rotary is like stock heads/cam(s) on a piston engine. They tend to be built more for low and mid range output rather than max flow and top end.

rotorpsi1 on aussie forum?
If so, you should give yourself more credit:nod:

To the OP: What is boost? Temperature? Density? Mass flow?:icon_no2:
Much to learn....

i run 20psi on 93 with a ported 13bre with 9.4:1 rotors

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.

well since we're talking stock ports and boost I'm wondering how much can the stock 3pc apex seals take if tuned properly without detonation or overheating?

they run 700+ hp on them in japan...

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

Yeah that's me.:)

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..

:scratch: 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.

tea 3rd gen......turbo is .70 compressor and .84 exhaust

turbo boost
 

Assuming everthing is still stock; which most of the cars are not. Is there a formula to determine how increasing boost will affect power output?

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.

CJG

North of the border so we have the option of 92 or 94 octane.

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

i wish this forum had a like and dislike button.