4g61t.org

has anyone had any emission issues with their 4g15 with the 4g37 upgrades? just wondering cause i will be going through emissions here soon.

jim

_________________
91 plym colt 4g 4g15 12v/ 4g37 upgrades 5spd flat black

I can guarantee your emissions will differ, but only the tailpipe sniffer will let you know how much. Even though things are supposed to be in tune with all the 4g37 equipment, you'll only know once the snifffer is hooked up and testing the car at a roll/partial load and hot idle, or whatever variation of the test they use in your area.

Should he set his timing a certain way for a better burn? In my opinion, I can't see why the 4g37 stuff is going to change much. That's considering also that everything is working so as to have a clean combustion in the first place. But there are secrets to having a better chance at emissions testing, isn't there? I've never had to actually get any of my cars tested. Gotta love Idaho!

_________________
Good stuff - trucks bring it!

If you knew someone who operated a machine and could test the car in a "testing" mode, then you could see real world changes as you modify the timing at the distributor with the ECU grounded and then let the motor go back to regular idle, grounding strap disconnected. This will give you a before and after, but the reason I say the emissions will differ is because of the design differences each motor has and how the original equipment compensated for that. My car just barely passed emissions (the old 4g15 setup I first owned), but the catalytic was probably on its last legs from passing oil through it for a gosh knows how long during its existence. If you whole system is hooked up, you have a good catalytic converter, and you bring the car in hot, that is about all you can do.

Someone here may remember a good timing setup for the 4g37 stuff, because I cannot speak for this part as I did not have to go through emissions with mine installed.

There'll be more fuel going in so it might give you a worse reading because the benchmarks are for a 1.5l and you're using 1.8l engine controls.

_________________
Had a:
1991 Eagle Summit ES Hatchback - 4g15 12v 5spd
1991 Dodge Colt -4g15 12v 4spd
Have a:
1978 Oldsmobile Cutlass - 468BBO TH350
Round 3:
1990 Dodge Colt-4G63T 5spd

here we got and 25mph crusie test and a idle test. i remember reading something about moving the cam timming 7* deg or something like that.

_________________
91 plym colt 4g 4g15 12v/ 4g37 upgrades 5spd flat black

i did my emission test this morning and passed with flying colors. also since it's fwd they don't let you do the cruise test the chick almost wreked my colt while doing the test. i'm glad i passed.

_________________
91 plym colt 4g 4g15 12v/ 4g37 upgrades 5spd flat black