CH 2.4L Tuning

NABZY

New Member
Hey legends!
I got the lovely 2007 CH limited edition, done some suspension upgrades but looking to hear what everyone else has done to increase power. Intake, exhaust, tuning? Would love to hear your perspective. Also im based in Adelaide if anyone knows any tuners that can work on these bad boys.

Thanks!!!
 
Hey mate, while I don't have a CH persay, I do have a 69 swapped coupe. I ran a 3 inch bore intake to a cold air source (stepped down to 2.5 to accommodate the stock maf), was a neat little upgrade. These engines respond very well to cams. 'Stage 2' cams with a tune have been dyno tuned to produce over 20 extra WHP when dialed in. Another thing to consider if that the exhaust has 2 cats, one in the header itself, and one in the midpipe. You could get some headers from an outlander of a similar vintage which bolt up to the stock system or go aftermarket. Bear in mind that you will need a tune to cancel out any codes which may be thrown from the o2 sensor. Hit up Off the Clock motorsport or LLT racing for tuning options and ECU reflashes
 
I have a 4G69 Outlander which only has 1 cat. These are a fraction more powerful than the Lancer versions in stock trim..
The cam is fine as it is if not a bit too aggressive.... that's right! The hi speed intake lobes are equivalent to a typical stage 2 cam and the exhaust lobes are somewhere between a stage 1 and stage 2 cam. The only cam problem is the low speed intake lobes are a bit on the sad side with one set of lobes having less lift than the other to "encourage a swirl effect" so marketing can make a big deal about this "Cyclone" technology. Nobody does this type of stuff anymore because everybody know knows that a 4 valve head uses tumble, not swirl to get a homogeneous fuel/air mix.
The problem with the generous high speed cam specs is that it crashes the dynamic compression ratio of the engine - the sad 9.5:1 CR is way to low to run 272 intake/ 256 exhaust cam durations. I shaved my head 23 thou (absolute maximum possible) to boost the CR to around 9.8:1 to combat this but really needs something over 10.5:1 to get the best out of it. I took the opportunity to sharpen up the port dividers in the head while it was apart as one set of valve has a partially obscured look at the manifold runners in line with the misplaced "cyclone" theory.
So on the Outy, the headers are a good 4-2-1 design - no reason to change. The 60mm throttle and airbox etc. is perfectly fine too.
The stock tune is pretty horrible - I have reflashed mine multiple times to develop a decent tune for power and economy. The Outy is a heavy vehicle and the fulltime AWD and auto box takes its toll on fuel economy but now it can put a little smile on my face from time to time. That is saying a lot since I came from a 220HP 4B12 CJ Lancer before this ;)
The 4G69 is a walk in the park to flash tune compared to the later 4B1x engines.... no fighting with a bastard dual VVT system!

Before you head off looking to lighten your wallet, these are the stock cam specs:
Opens Closes Duration Lift Center
Intake Lo 10 BTDC 42 ABDC 232 4.094 106
Intake Mid 12 BTDC 44 ABDC 236 9.344 106
Intake Hi 24 BTDC 68 ABDC 272 10.3854 112
Exhaust 58 BBDC 18 ATDC 256 9.9266 110

*Intake Lo is for 4 valves and Mid for the other 4. Intake Hi kicks in around 3500rpm and the exhaust remains on the same lobes all of the time.
 
Some comparisons for those who are interested in tuning....
1st off: Stock 4G69 CH Lancer timing
1688705732745.png
2nd: Stock Outlander 4G69 timing (same as Lancer)
1688705210537.png
3rd: Tuned Outlander 4G69
1688705239488.png
Note that the load axis and rpm axis in the tuned map are altered to give better resolution withing the operating range of the engine.
Not sure why Mitsi thought an 11000rpm axis or a 260% load axis would be handy rather than having a touch more resolution where needed but then Mitsi is not really a car manufacturer anymore......
There are 2 sets of timing maps in these ROMs for 2 different engines. I think the 1st pair of maps is for 4G64 by the looks of them. The 2nd set are definitely the active pair for 4G69.
So if you compare the tuned map to stock (carefully watching the changed axis), you will see where significant increases can be applied that will add a bit of torque and fuel economy. Keep in mind my engine had a 23 thou head shave to pump up the CR so even more advance may be possible on stock CR. I always run on E10 fuel which also gives a better result than 91RON and not too far behind what passes for 98RON in Australia (i.e. crap fuel). The Outlanders are heavy (and AWD, Auto only in AU) so the lighter Lancer (particularly in 5MT form) will be a little less prone to knock as loads will not skyrocket getting the brick to start moving.... :rolleyes:
The mivec (vtec in normal speak) switchover point of 3500rpm is well chosen so nothing to tweak there so this leaves only AFR adjustments (in stock these are horrendous) to get a decent tune. There are lots of niceties like fixing up the overzealous warmup idle rpms and tweaking up the open loop transition loads to suit your driving style / economy compromise but these are not really what you would call tuning - more a preference type of thing.
 
Can’t believe I missed this reply. Awesome work! The tweaking is what separates a good tune from a bad one personally but I do get your point.

Mitsubishi uses the 11000rpm and 260 load axis as your LIMP mode tune. When you have an air leak, dud MAF ect, you’ll find the car logs into those areas of the map - which is also why there was such a harsh jump between the prior cells.
 
Can the stock ecu be tuned?
According to rpw they use a haltech for tuning 4b69. Id like to get the random flat/dead spot on takeoff fixed which is apparently a factory tune issue but I’m not keen to spend thousands on a haltech to get a few ponies and a factory fault fixed.
 
The stock ecu cases are quite capable of being tuned themselves. It's a pretty common occurrence on these setups, just because they use a tactrix cable which is a regular tool of tuners.

Have a gander at off the clock motorsports or LLT racing, they're the specialists when it comes to stock ECU tuning
 
Thanks. Will do.
Checked out off the clock and they offer tuning solutions where you post in your ecu and they flash it for you. There is a place here in perth that are well known for tuning mitsis( usually evo turbo)called c red. If they can’t do it for me I’ll send it off to get done down the track.
 
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