Is it possible???
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Evolving Member
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From: Milwaukee, WI
Is it possible???
Do you guys think it would be safe to boost the evo 18 PSI in higher rpm's when it drops to 16 PSI??? It would be cool to keep it boosted at 19psi through all rpm's if that is safe. I have an intake also and will have an exhaust by next weekend, but just wondering if its safe to do this???
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Originally posted by Daveyd
Question..Why didn't Mitsu just manufacture the car to have it obtain 18psi boost the whole way through the powerband?
Excuse me for my ignorance if this is a stupid question.
Question..Why didn't Mitsu just manufacture the car to have it obtain 18psi boost the whole way through the powerband?
Excuse me for my ignorance if this is a stupid question.
Claudius says 1.5 bars which is ~22 PSI, and I believe him more than you.
Originally posted by Sweft
Says who?
Claudius says 1.5 bars which is ~22 PSI, and I believe him more than you.
Says who?
Claudius says 1.5 bars which is ~22 PSI, and I believe him more than you.
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Originally posted by Daveyd
Question..Why didn't Mitsu just manufacture the car to have it obtain 18psi boost the whole way through the powerband?
Excuse me for my ignorance if this is a stupid question.
Question..Why didn't Mitsu just manufacture the car to have it obtain 18psi boost the whole way through the powerband?
Excuse me for my ignorance if this is a stupid question.
Mixing 87 octane pump gas with 18 psi of air into an enigine with 8.8:1 compression and running at high revs may detonate so much that the ECU can't retard the ignition enough, which would quickly result in a broken engine. It's a guess but seems to be a reasonable assumption. Although the manual says it recommends premium gas it also says that the motor can adjust for lesser gas. Hey we've all seen how careless some people can be, MMC is just just covering their butts.
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Joined: Mar 2003
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From: CA
My poor english makes me crazy.USDM Evo8 ECU have Overboost Cut Func.
I'm not sure, cause i don't have chance to try it.
but in ECU data... control Overboost.
Evo have MAP sensor,
It check boost status and control boost with waste gate
control solenoid.
if use BC. ECU can't control waste gate,
so easy to make more boost than ECU's target boost.
but still MAP sensor checked boost status.
when reach to Over boost that DATA.
ECU control Fuel and Igntion time for decrease Peak boost.
In the case EVO5 RS, It have no Over boost control func.
but RS is race version...
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Originally posted by Drivemecrazy
In the case EVO5 RS, It have no Over boost control func.
but RS is race version...
In the case EVO5 RS, It have no Over boost control func.
but RS is race version...
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Joined: Mar 2003
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From: CA
Originally posted by Claudius
A friend of mine has an Evo 5 RS. The ECU cuts the fuel at 1.25 bars boost approximately. Also, the fuel cut depends on MAF value (Karman frequency).
A friend of mine has an Evo 5 RS. The ECU cuts the fuel at 1.25 bars boost approximately. Also, the fuel cut depends on MAF value (Karman frequency).
When AFS over 6350Hz Karmann Frequancy,
ECU try to control fuel too.
Cause AFS reach to saturation, it's not from Overboost contol
may be....
Last edited by Drivemecrazy; Apr 8, 2003 at 12:18 PM.
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I thought it was 1700 Hz?
When I had an S-AFC, I put lower values in the high throttle map and increased the fuel pressure
Measuring with SARD Analyzer (1.45 bar boost). But now I'm worried about the injector spray pattern (92% duty cycle with 4.5 bars fuel pressure! 
)
When I had an S-AFC, I put lower values in the high throttle map and increased the fuel pressure
Measuring with SARD Analyzer (1.45 bar boost). But now I'm worried about the injector spray pattern (92% duty cycle with 4.5 bars fuel pressure! )
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Joined: Mar 2003
Posts: 39
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From: CA
I said 6350 Hz...
Poor english of mine makes me crazy.
It's from EVO5 RS ECU data.
I try to find why happen boost cut on EVO5 RS.
but as far as i know. RS model have no boost limits.
About your injection duty.
Have you checked LAMDA?
When reach to Injector duty 92%,
Fuel pressure keep going 4.5bar ?
Poor english of mine makes me crazy.
It's from EVO5 RS ECU data.
I try to find why happen boost cut on EVO5 RS.
but as far as i know. RS model have no boost limits.
About your injection duty.
Have you checked LAMDA?
When reach to Injector duty 92%,
Fuel pressure keep going 4.5bar ?
Guest
Posts: n/a
Originally posted by Drivemecrazy
I said 6350 Hz...
I said 6350 Hz...
... But I have never seen more than 1900 Hz on my PowerFC...
Originally posted by Drivemecrazy
Poor english of mine makes me crazy.
Poor english of mine makes me crazy.
I understand you very well! Where are you from?
Originally posted by Drivemecrazy
It's from EVO5 RS ECU data.
I try to find why happen boost cut on EVO5 RS.
but as far as i know. RS model have no boost limits.
It's from EVO5 RS ECU data.
I try to find why happen boost cut on EVO5 RS.
but as far as i know. RS model have no boost limits.
Originally posted by Drivemecrazy
About your injection duty.
Have you checked LAMDA?
About your injection duty.
Have you checked LAMDA?
You can see it here (in Kanji I think): http://gooparts.com/special/spe8/08.html
Originally posted by Drivemecrazy
When reach to Injector duty 92%,
Fuel pressure keep going 4.5bar ?
When reach to Injector duty 92%,
Fuel pressure keep going 4.5bar ?