4g94 map sensor question

OZRallyGuy23 · May 19, 2009, 12:40 PM

Hey guys so ive finally made up my mind to turbo my 2003 oz. I have already picked up a evo 8 16g w/9.8 hotside and evo 8 fmic w/all piping and bov. Now as im getting everything else together, im trying to answer a few questions that i still have. Does the factory 4g94 map sensor read boost or does it top out at 0 vac? Same with the factory fpr - does it increase psi with boost?

OhSixLancer · May 19, 2009, 02:33 PM

Sorry if it seems like I'm stealing your thread, but does the evo 8 intercooler piping fit easily in our cars?

bcollinstex · May 19, 2009, 02:39 PM

You have to do some cutting

And the stock ECU will work with running a turbo, you just don't have the clarity that a turbo ECU does

OZRallyGuy23 · May 19, 2009, 08:09 PM

Well right now im trying to fit it up against the bottom of the crash bar, but the ic hangs out the bottom of the bumper roughly half an inch or so. So right now im drawing up some plans to fab up a sheet of metal that will go from the bottom of the front bumper, under the ic, and back up a bit and screw it to the bottom of the lower radiator support - something similar to those metal aftermarket skid plates you can buy for the evos, but alot shorter. Im not comfortable with the ic hanging out half an inch without any protection. It fits almost perfectly directly in front of the condenser, but since the fans have to be moved to that location, the ic will have to bo mounted elsewhere.

While im on this topic, do any of you guys know where i can find a turbo manifold with a 16g flange for the 4g94??????? Speedcorps decided not to make the one they released for special order and are refunding people.

Now back to the map sensor and stock fpr? Does anyone know if the stock map sensor and fpr read boost?

OhSixLancer · May 19, 2009, 08:15 PM

Quote:

Originally Posted by OZRallyGuy23

While im on this topic, do any of you guys know where i can find a turbo manifold with a 16g flange for the 4g94??????? Speedcorps decided not to make the one they released for special order and are refunding people.?

I'm actually looking for one too and RRM has one... little pricey though... if you find cheaper let me know.
http://www.roadracemotorsports.com/s...roducts_id=389

OZ Rally · May 19, 2009, 08:21 PM

No the stock map or fpr do not read boost and need to upgraded.
In other words, the ecu needs to be reflashed and the fpr needs to be replaced.

Get a walbro 255, bigger injectors, and aem fpr to safely turn up the boost. Once you have all that done then get the tune.

OhSixLancer- Where in Illinois you from?

OZRallyGuy23 · May 19, 2009, 08:59 PM

Thanks dude, so i know which fpr im gonna go with, but wheres a good place to get a new map sensor?

For right now, my plans are to run 8 psi and see how it goes. If i like it, then later this summer i plan to pull the motor and do forged internals and the whole deal and i plan to run 19 or 20 psi.

Also is a 1 to 1 ratio fpr a good route to go?

OhSixLancer · May 19, 2009, 09:04 PM

Quote:

Originally Posted by OZ Rally

OhSixLancer- Where in Illinois you from?

Aurora

OZ Rally · May 19, 2009, 09:11 PM

You don't need to change any of your sensors. The only upgrades you need is fuel and ignition. If anything get some Magnecore or MSD wires but you won't really need them.

I've been boosted for a month or so now and haven't had a tune, just make sure to monitor everything and always check for leaks.

OZ Rally · May 19, 2009, 09:12 PM

Quote:

Originally Posted by OhSixLancer

Aurora

I'm from Streamwood, do you ever go to any meets or anything?

senate6268 · May 19, 2009, 09:26 PM

Quote:

Originally Posted by OZRallyGuy23

Thanks dude, so i know which fpr im gonna go with, but wheres a good place to get a new map sensor?

For right now, my plans are to run 8 psi and see how it goes. If i like it, then later this summer i plan to pull the motor and do forged internals and the whole deal and i plan to run 19 or 20 psi.

Also is a 1 to 1 ratio fpr a good route to go?

Its not a matter of changing out the MAP sensor so the ECU will see and adjust for boost. The Lancer ECU cannot account for boost. It will see loads over 100%, but you need to adjust your fuel/ignition tables accordingly to compensate for the added airflow. Do some searching in regards to EcuFlash and how it is used on the Lancers, especially turbo Lancers. It is the best solution available, second only to a full EMS.

OZ Rally · May 19, 2009, 09:36 PM

PM'd

OhSixLancer · May 19, 2009, 09:53 PM

Quote:

Originally Posted by OZ Rally

I'm from Streamwood, do you ever go to any meets or anything?

My lancer is 100% stock right now, so no lol. I would definitely consider it in the future though.

OZRallyGuy23 · May 20, 2009, 02:21 PM

yea see im gonna buy the tactrix cable so i can mod my ecu tables but if the map sensor cant read boost and the ecu sees over 100% load, doesnt that make it hard to tune as opposed to the ecu knowing exactly what is going on? Now im not saying that i wanna replace the map and let the ecu work things out, im still gonna tune it. So then my question here is can you tune the ecu with the ecu now knowing the motor is boosted AND have good results or will the ecu be able to read boost with an aftermarket map and not do anything about it cause its not programmed to?

senate6268 · May 20, 2009, 06:59 PM

Quote:

Originally Posted by OZRallyGuy23

yea see im gonna buy the tactrix cable so i can mod my ecu tables but if the map sensor cant read boost and the ecu sees over 100% load, doesnt that make it hard to tune as opposed to the ecu knowing exactly what is going on? Now im not saying that i wanna replace the map and let the ecu work things out, im still gonna tune it. So then my question here is can you tune the ecu with the ecu now knowing the motor is boosted AND have good results or will the ecu be able to read boost with an aftermarket map and not do anything about it cause its not programmed to?

The Lancer and Evo utilize the same MAP sensor, so switching the MAP sensor is unnecessary. You can still tune the ECU perfectly for boost. The Lancer ECU doesn't interpret for boost, just for load. The Evo's ECU knows the difference between boost and vacuum. This doesn't stop you from tuning your ECU. Plenty of members, myself included, have tuned for over 200whp using EcuFlash on different turbo setups. You're merely adjusting fuel/ignition tables in accordance to the loads the ECU is seeing.