M52 Bad Gas Mileage

[keada714]

Hey guys,

I am in my second tank with this e30/m52 setup. Im getting an average of 18mpg. Half of the driving is in LA traffic and the other half is mix of city and hwy.

The motor is obd1 mated with the g260 and 4.10 diff. Spark plugs was replaced with Ngk cooper plugs. Pulled them out yesterday and they look normal. There is no cat and a slight exhaust leak, so it does smell but nothing out of the ordinary. Motor runs great and doesn't seem to be running rich.

Car is not throwing any code that I am aware of. Does this drivetrain combo really affect the efficiency this much? Anyone have any ideal on why the car is so inefficient. I honestly thought it would be a little more efficient. Any help would be greatly appreciated.

[efficient]

that diff is your problem. its too short even on m20.

[justin_l_]

Put a 3.46 or similar in there and enjoy some improvement. That is too short of a gear set.

[328ijunkie]

4.10 isnt too terrible with G260. Basically same as ZF/3.23 What OBD1 chip?

[mpowerful]

I get about 18-20 with mostly in town driving. Very similar setup to yours and i have a 3.46lsd.

[keada714]

I will have to check if there is a chip. I doubt there is one in there.

[keada714]

Is a chip really needed?

[keada714]

Is a chip really needed?

[M3PO]

It won't run without a chip of some kind lol

[keada714]

DMe looks to be a 413 silver with a turner chip. Any chance in figuring out what mod the chip was flashed for beside the ews delete?

[328ijunkie]

You should be able to call them and they can look up their part#...

[keada714]

M52 Bad Gas Mileage

Just called them and looked on their list of chips offer. Chip is for a m50tu, ews delete, lightweight flywheel and speed sensor delete.

Should I be looking for another chip that is tailored for the extra .3L displacement and 21.5lb injectors?

[328ijunkie]

Just called them and looked on their list of chips offer. Chip is for a m50tu, ews delete, lightweight flywheel and speed sensor delete.

Should I be looking for another chip that is tailored for the extra .3L displacement and 21.5lb injectors?

If you ever want the car to run relatively correctly. Right now you're puking gas not having a chip for those injectors

[keada714]

M52 Bad Gas Mileage

Thanks for your help. I will look into getting a correct chip as this will be driven a fair amount.

[keada714]

Bump. Got a squid chip for the right injectors but mileage is still crap.