MNGSX
20+ Year Contributor
- 2,533
- 25
- Mar 30, 2003
-
Bloomington,
Minnesota
Actually the parts on the stock jspec car are the same as the rally cars. The ECU just is'nt configured to use it.
So the Jspec manifold came about FOR rally racing. Pretty much the entire EVO was designed for that. I think it cam factory either for homologation purposes or to make it easier for race teams to buy cars to build with much of the running gear in place.
You can't say discussing the mitsu rally ALS when discussing the JSPEC manifold is off topic because the manifold was designed specifically for EVO rally ALS systems.
The rally ALS is primarily designed around just that. Compressed air into the exhuast manifold.
On Evo forums it has been discussed. Basically an EGR style valve is PWM (pulse width modulated) or cycled open and closed to vary the airflow into the ports of the exhaust manifold.
I can't remember if the ALS valve gets its air directly from inbetween the compressor outlet and TB or if it first vents from UICP via the BOV then the ALS valve diverts it to the inlet (post MAF) or the exhaust manifold ports. Simply put the air is compressed by the turbo itself and used to provide more O2 to burn fuel in the manifold and spool it up. I'm pretty sure it gets it directly from the UICP.
I have'nt seen a Jspec car with the full mitsu race ECU on it yet but I'm gessing what makes it so much more docile and controllable is the ability to vary igniton progressively from normal to like 25 degrees ATDC in increments instead of just switching instantly. Also the fuel enrichment during ALS is more gradual. Thirdly the airflow into the exh manifold can be varied as well via the PWM. So they can controll alot more variables than most systems.
I think if you bang the search button at evolution.net you will find posts of people discussing activating the stock JSPEC system for actual street use.
So the Jspec manifold came about FOR rally racing. Pretty much the entire EVO was designed for that. I think it cam factory either for homologation purposes or to make it easier for race teams to buy cars to build with much of the running gear in place.
You can't say discussing the mitsu rally ALS when discussing the JSPEC manifold is off topic because the manifold was designed specifically for EVO rally ALS systems.
The rally ALS is primarily designed around just that. Compressed air into the exhuast manifold.
On Evo forums it has been discussed. Basically an EGR style valve is PWM (pulse width modulated) or cycled open and closed to vary the airflow into the ports of the exhaust manifold.
I can't remember if the ALS valve gets its air directly from inbetween the compressor outlet and TB or if it first vents from UICP via the BOV then the ALS valve diverts it to the inlet (post MAF) or the exhaust manifold ports. Simply put the air is compressed by the turbo itself and used to provide more O2 to burn fuel in the manifold and spool it up. I'm pretty sure it gets it directly from the UICP.
I have'nt seen a Jspec car with the full mitsu race ECU on it yet but I'm gessing what makes it so much more docile and controllable is the ability to vary igniton progressively from normal to like 25 degrees ATDC in increments instead of just switching instantly. Also the fuel enrichment during ALS is more gradual. Thirdly the airflow into the exh manifold can be varied as well via the PWM. So they can controll alot more variables than most systems.
I think if you bang the search button at evolution.net you will find posts of people discussing activating the stock JSPEC system for actual street use.
I'll go to evolution.net and do some serious searching. That was something else I was looking for was a specific site that would know a wealth of knowledge on EVOs and how they work inside and out. Again I appologize since I didn't know they were the same thing. Later.
