Evo Ix

[Godlaus]

http://motortrend.com/roadtests/seda...oix/index.html

Looks like a cool car....but...

The thing's running at 20.2 psi. How long before the thing self-detonates?

[spi-ti-tout]

Thanks for the link man....I've been waiting for this for a long time
It seems much better than the VIII but I still don't like it....lets see

[lightweight]

The Mitsu motor(4G63 I think) is known for its reliability. The block was designed in mid '80s and I think it was first put in production in 1987. It is designed with rallying in mind, as the same engine (with modifications of course) competes in WRC. Of course there is a price to pay as the engine along with its anchillaries (intercooler, pipes etc) weighs a lot.

If you leave it stock the only thing you have to worry about is gas, tyres and clutches.

Rumours say that Mitsubishi will radically redesign the Evo X(they have to name it differently, or in 2015 we'll have the evo XXXIV). Some talk even of a hatch version to compete with the rumoured hatch Impreza. Who knows. As I said it's just rumours...

[megotmea7]

http://motortrend.com/roadtests/seda...oix/index.html

Looks like a cool car....but...

The thing's running at 20.2 psi. How long before the thing self-detonates?

its not the amount of pressure your pushing, its the amount of air your moving. a small turbocharger moves less air at a given pressure than a larger turbocharger, same goes for superhcargers. the evo runs a small turbocharger to cut down on turbo lag due it its better inertial properties than a larger turbo. but to make power it pushes a high pressure to move enough air to make comparable power to the competition(real: STi). if the evo was runing a t04E-R at 20psi would be sure to cut engine life severely, even on a fully built motor. because the t04E-R would be moving a much larger amount of air at 20psi than the evo's TD04 is. but the T04E-R equipped vehicle would also be making much more power, assuming it is setup for that turbo setup.

[85RX7]

Although the engine could still be mad reliable if the compression was dropped to around 6:1 Then it could run 20psi with no engine problems, but the turbs wont last as long as the engine obviously.

[KnifeEdge_2K1]

its not the amount of pressure your pushing, its the amount of air your moving. a small turbocharger moves less air at a given pressure than a larger turbocharger, same goes for superhcargers. the evo runs a small turbocharger to cut down on turbo lag due it its better inertial properties than a larger turbo. but to make power it pushes a high pressure to move enough air to make comparable power to the competition(real: STi). if the evo was runing a t04E-R at 20psi would be sure to cut engine life severely, even on a fully built motor. because the t04E-R would be moving a much larger amount of air at 20psi than the evo's TD04 is. but the T04E-R equipped vehicle would also be making much more power, assuming it is setup for that turbo setup.

um 20psi is 20 psi regardless of the size of the turbo, the psi is usually read at the manafold not the turbo housing ...

[KnifeEdge_2K1]

the competition versions run with 1.9 bar which is like 26-30 psi with an 8.0-1 compression ratio

with higher octane or methanol fuel u could prolly run 2+ bar with close to 9-1 compression

[Quiggs]

um 20psi is 20 psi regardless of the size of the turbo, the psi is usually read at the manafold not the turbo housing ...

But 20 PSI in a larger turbo will push more total air.

[megotmea7]

um 20psi is 20 psi regardless of the size of the turbo, the psi is usually read at the manafold not the turbo housing ...

you obviously missed the point of my post, and you missunderstand the concequences of pressure versus flow. i never mad mention of where the pressure was measured.

20psi is no indication of how much air is moving thru an engine. turbo's come in varying sizes and trims. higher flowing turbo's need to push less pressure to make an equal amount of power/torque when compared to a smaller turbo. hence my example between the evo's TD04 and larger turbos, the T04E-R's. the evo can get away with running ~20psi of boost by having a motor built to ahndle bost and running a turbocharger thats small in size. the smaller turbo reduces lag, and the higher boost pressure allows the turbo to flow enough air to make the power needed by the evo to be competitive. the downside to running higher pressure out of a smaller turbo is compressor efficiency(or lack of), compressor output temperatures tend to rise when boost moves outside the turbo efficiency. hence the evo has a fairly large intercooler to bring this temperature down before the intake manifod to reduce the chance of detonation. the STi by comparison has larger turbo pushing less boost(and the same aproximate power) and thus a smaller intercooler(and a significantly less efficient top mount at that) because intake charge temps after the turbo are comparativly low requiring less temperature drop by means of the intercooler.

[Blue Supra]

it looks good. Im an EVO fan and i cant wait to see some in our local showroom

[fpv_gtho]

i cant wait to see some in our local showroom

That should be good, its a good thing theyre not charging $80K for them anymore

[KnifeEdge_2K1]

you obviously missed the point of my post, and you missunderstand the concequences of pressure versus flow. i never mad mention of where the pressure was measured.

20psi is no indication of how much air is moving thru an engine. turbo's come in varying sizes and trims. higher flowing turbo's need to push less pressure to make an equal amount of power/torque when compared to a smaller turbo. hence my example between the evo's TD04 and larger turbos, the T04E-R's. the evo can get away with running ~20psi of boost by having a motor built to ahndle bost and running a turbocharger thats small in size. the smaller turbo reduces lag, and the higher boost pressure allows the turbo to flow enough air to make the power needed by the evo to be competitive. the downside to running higher pressure out of a smaller turbo is compressor efficiency(or lack of), compressor output temperatures tend to rise when boost moves outside the turbo efficiency. hence the evo has a fairly large intercooler to bring this temperature down before the intake manifod to reduce the chance of detonation. the STi by comparison has larger turbo pushing less boost(and the same aproximate power) and thus a smaller intercooler(and a significantly less efficient top mount at that) because intake charge temps after the turbo are comparativly low requiring less temperature drop by means of the intercooler.

c u didnt say that, and the point of the topic/argument was why can the evo run 20 psi without knocking, the way u made your argument before implies that a small turbo at X psi wont cause knocking but a larget turbo at X psi will
while the temperature of the smaller turbo will be higher at that psi the difference is so slight it wouldnt account for the changes mentioned

[megotmea7]

c u didnt say that, and the point of the topic/argument was why can the evo run 20 psi without knocking, the way u made your argument before implies that a small turbo at X psi wont cause knocking but a larget turbo at X psi will
while the temperature of the smaller turbo will be higher at that psi the difference is so slight it wouldnt account for the changes mentioned

that was the point, the original question was how can the evo run over 20psi and not blow up, i was explaining how it is not pressure that blows motors, it is heat and amount of air flowed, the larger the turbo less less boost is needed to flow the same amount of air, a smaller turbo at 20psi isnt flowing THAT much air, and said motor is perfectly capable of being reliable. i only expanded on the temperature and compressor inefficiency part of it in the second post.

[KnifeEdge_2K1]

yeah but the reason engines detonate is the heat and pressure INSIDE the cylinder, so a 20psi small turbo and 20psi large turbo will always result in the same amount of air in the cylinder, TRUE the temperature of the intake charge will be different, but unless the size of the turbo's are significantly different from each other the heat difference wont be THAT great, and the use of an intercooler will greatly reduce the temp of this charge newayz

i think we're on the same page now, we're just arguing about what was said B4, and thats pretty stupid if we both understand each other now

[johnnynumfiv]

yeah but the reason engines detonate is the heat and pressure INSIDE the cylinder, so a 20psi small turbo and 20psi large turbo will always result in the same amount of air in the cylinder, TRUE the temperature of the intake charge will be different, but unless the size of the turbo's are significantly different from each other the heat difference wont be THAT great, and the use of an intercooler will greatly reduce the temp of this charge newayz

i think we're on the same page now, we're just arguing about what was said B4, and thats pretty stupid if we both understand each other now

PSI isn't a measure of volume. Wouldn't a large turbo at the same pressure as a small tubro put more air into the cylinder than the small one?