safe boost settings
safe boost settings
hey guys. i just bought a 03 evo 8 and put a boost controller on it im holding 20-21 spiking 23. is this safe? i searched i couldnt find nothing.
i wouldn't g over 20.5 psi if i were you.. you have no fuel pump,inectors and some source of engine management. 21psi is the max i would go. don't worry where it spike. read what's constant.
i wouldn't g over 20.5 psi if i were you.. you have no fuel pump,inectors and some source of engine management. 21psi is the max i would go. don't worry where it spike. read what's constant.
Fuel pump and injectors don't really matter all that much if your only mod is MBC. I WOULD worry about where it spikes.
Originally Posted by 4TUN8
I disagree with this person.
Fuel pump and injectors don't really matter all that much if your only mod is MBC. I WOULD worry about where it spikes.
Fuel pump and injectors don't really matter all that much if your only mod is MBC. I WOULD worry about where it spikes.
First off, you have just repeat what said about the spike.
second, are you ****ing kidding about injector and fuel pupmp?? if you boost more you going to need more fuel and more octane, why do you think people boost higher on 101+ than on 91?? There's such thing as "FUEL CUT" you know
Originally Posted by vboy425
First off, you have just repeat what said about the spike.
second, are you ****ing kidding about injector and fuel pupmp?? if you boost more you going to need more fuel and more octane, why do you think people boost higher on 101+ than on 91?? There's such thing as "FUEL CUT" you know
second, are you ****ing kidding about injector and fuel pupmp?? if you boost more you going to need more fuel and more octane, why do you think people boost higher on 101+ than on 91?? There's such thing as "FUEL CUT" you know
Your wrong about the injectors and fuel pump. The stock ones are enough to get you to the power levels of ~350whp. Engine management is what you need to be concerned with when running higher than stock boost levels.
A 23psi 'spike' settling to 21psi is at the upper realm of what you should be pushing on the stock ECU w/o a flash or piggy back.
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isn't fuel cut more cause you car reads too much air coming through? having just a safc, ems, or a flash doesn't mean you should run more boost. yeah tuning for your boost level is important, but our cars come so rich 1-2 psi will not get you into a lean situation. you should run no more then 21 lbs with 93. 20 is safer obviously. i would not run more then that untill you get some big mods like cams and studs, injectors, pump, and a flash.
Originally Posted by NapervilleEVO
isn't fuel cut more cause you car reads too much air coming through? having just a safc, ems, or a flash doesn't mean you should run more boost. yeah tuning for your boost level is important, but our cars come so rich 1-2 psi will not get you into a lean situation. you should run no more then 21 lbs with 93. 20 is safer obviously. i would not run more then that untill you get some big mods like cams and studs, injectors, pump, and a flash.
yep, i'm glad you sad it.
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Originally Posted by fsugatorbait
Your wrong about the injectors and fuel pump. The stock ones are enough to get you to the power levels of ~350whp. Engine management is what you need to be concerned with when running higher than stock boost levels. You can boost almost as much as you want, just how long do you want your turbo to last. You got to pay to play :-)
A 23psi 'spike' settling to 21psi is at the upper realm of what you should be pushing on the stock ECU w/o a flash or piggy back.
A 23psi 'spike' settling to 21psi is at the upper realm of what you should be pushing on the stock ECU w/o a flash or piggy back.
of course with EMS like from AEM, 'cause you can tune every little thing, but for $1400 dollars plus tuning anywhere from 400-1000 bucks, no one really have that kind of money. With a SAFCII work just fine. My car boost 21-22psi tapper down after 6580rpm to 19.8psi and hold it until 7455rpm at 91 and 27psi settle down to 24.5psi at 101 octane. I made 317whp-315lbt, on 101 i made 348whp-349lbt. my mods are the following. The results are from Dyno at TuningTechnologies and Zeitronix Datalog.
Joe P MBC
Helix O2 housing
Megan Downpipe
Perrin Cat-Delete
Tanabe UltraMedalion Exhaust
HKS 272/272 Cams
Zeitronix Wideband, boost,EGT
Apexi SAFC II
RC 750CC Injectors
Walbro 255l HP
ACT 6 PUCKS Clutch
ARP Headstuds
K&N Drop in
APR Canards
Helix O2 housing
Megan Downpipe
Perrin Cat-Delete
Tanabe UltraMedalion Exhaust
HKS 272/272 Cams
Zeitronix Wideband, boost,EGT
Apexi SAFC II
RC 750CC Injectors
Walbro 255l HP
ACT 6 PUCKS Clutch
K&N Drop in
APR Canards
Sun Auto Hyper GT
Last edited by vboy425; Oct 13, 2005 at 09:54 AM.
ok thanks guys.. so i really dont even need to worry about the spike just what it hold correct? some time it only holds about 19 some times 21. the biggest spike i have had was 25 and that was from a kinda lowish 3rd.
Originally Posted by vboy425
of course with EMS like from AEM, 'cause you can tune every little thing, but for $1400 dollars plus tuning anywhere from 400-1000 bucks, no one really have that kind of money. With a SAFCII work just fine. My car boost 21-22psi tapper down after 6580rpm to 19.8psi and hold it until 7455rpm at 91 and 27psi settle down to 24.5psi at 101 octane. I made 317whp-315lbt, on 101 i made 348whp-349lbt. my mods are the following. The results are from Dyno at TuningTechnologies and Zeitronix Datalog.
No one said anything about spending $1400 for the EMS. An AFC or $200 flash would be fine.
Originally Posted by fsugatorbait
No one said anything about spending $1400 for the EMS. An AFC or $200 flash would be fine.
i didn't say you are wrong. I'm just saying that EMS the best if you have the money.
Originally Posted by vboy425
First off, you have just repeat what said about the spike.
second, are you ****ing kidding about injector and fuel pupmp?? if you boost more you going to need more fuel and more octane, why do you think people boost higher on 101+ than on 91?? There's such thing as "FUEL CUT" you know
second, are you ****ing kidding about injector and fuel pupmp?? if you boost more you going to need more fuel and more octane, why do you think people boost higher on 101+ than on 91?? There's such thing as "FUEL CUT" you know
I have also never hit fuel cut before or after my fuel pump. Our fuel system is fine for whatever boost the thread originator is going to run on pump gas. What he should do is set his MBC so that it spikes no higher than 22psi. It should never spike to 25psi...it should also not be fluctuating that much. I never let mine spike higher than 22psi. It still holds 20-21 through most of the powerband, but it never stays above 20 after 7k, which is fine with me.
[QUOTE=I have also never hit fuel cut before or after my fuel pump. Our fuel system is fine for whatever boost the thread originator is going to run on pump gas. What he should do is set his MBC so that it spikes no higher than 22psi. It should never spike to 25psi...it should also not be fluctuating that much. I never let mine spike higher than 22psi. It still holds 20-21 through most of the powerband, but it never stays above 20 after 7k, which is fine with me.[/QUOTE]
ok ill do that thanks for the info
ok ill do that thanks for the info