14 replies to this topic

[evil003]

Was wondering how much boost i can ran in the evo 3?.As exhaust and thats about it

[MAD-racer]

With stock fuel pump not more 1.0 kg/cm3
With good fuel system not more 1.2 kg/cm3 (for evo3 only) becouse Comp Ratio is 9.1 on evo3 pistons

[JAP63]

With stock fuel pump not more 1.0 kg/cm3
With good fuel system not more 1.2 kg/cm3 (for evo3 only) becouse Comp Ratio is 9.1 on evo3 pistons

Exactly what i was about to say.

Dont go over a bar, why would u want to anyway, theyre quick on 10 psi. The motor has high compression and good cams, they make really good power..if you want to run up over a bar, i think at least youd want a reg, and a pump, then a good tune, and maybe an SAFC2 or a chip.

[WindeX]

I am not sure that the comp ratio is that high, I have read alot of different info about the comp ratio. I would certainly get it tuned and get the tuner to do the boost adjustments, that way they can make sure you arent going to blow the sucker up.

[Dean]

9.0:1 is the evo 3 comp ratio.
and yes around the 15psi mark, but i'd get it dynoed if you intend on playing with boost

[CLuTZ]

9.0:1 is the evo 3 comp ratio.
and yes around the 15psi mark, but i'd get it dynoed if you intend on playing with boost

+1. Check the AFR's and play with the CAS until you find a point where the car reaches its limit, then back it off a little.

[VR-4Squid]

Don't play with the cas! that sets the whole timing map out throughout the entire rev/load range and basically buggers your fuel economy and driveability!

[GSR]

What you just said is right but i still ask my self why not play with the cas?

Im asking this in general, not just refering to his car/engine, but lets just say, considering that he wants to raise boost, isn it better to pull out few degrees throughout the entire rev/load range and loose a bit of economy but at least be safe everywhere (especialy when under load) rather then leaving it as is to keep the economy and having a risk of engine pinging when under load...

[JAP63]

Adjusting the CAS if done properly should be fine..al your doing is setting your whole map forward or backward a few degrees right?
As long as you make allowances for it, (good fuel, cool air) it should work.

[VR-4Squid]

What you just said is right but i still ask my self why not play with the cas?

Im asking this in general, not just refering to his car/engine, but lets just say, considering that he wants to raise boost, isn it better to pull out few degrees throughout the entire rev/load range and loose a bit of economy but at least be safe everywhere (especialy when under load) rather then leaving it as is to keep the economy and having a risk of engine pinging when under load...

Most of the time on the road is spent off-boost and at low throttle openings, (try logging the tps over your favourite twisty road - you'll be suprised) - so it seems silly to improve the outright power at the expense of the rest of the map when that is where you spend the most time.

Especially when the factory ecu can be chipped and reprogrammed to suit.

[CLuTZ]

Especially when the factory ecu can be chipped and reprogrammed to suit.

Unless you get the car tuned on the fly, a chipped ECU can be useless!

I've had good results with advancing the timing a few degrees- you just gotta make sure that you don't over do it!

[JAP63]

Most of the time on the road is spent off-boost and at low throttle openings, (try logging the tps over your favourite twisty road - you'll be suprised) - so it seems silly to improve the outright power at the expense of the rest of the map when that is where you spend the most time.

Especially when the factory ecu can be chipped and reprogrammed to suit.

Thats a fair enough point you make.

[CLuTZ]

Mitsubishi maps are rich as hell- off boost my old car ran SWEET, and was serioulsy quick, ran 111mph with a 2.5 60ft

[evil003]

thanks guys,some good advice from all

[evil003]

[quote name='evil003']Was wondering how much boost i can ran in the evo 3?.As exhaust and thats about it.Sorry 1 more thing what about the blow off is the stardard gunna hold boost?