Toymods Car Club Inc: Tech & Conversions => 1jz ma61 overheating

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SUPRAGTE
Forums Junkie

Location:
North Sydney
Registered:
May 2002

Re: 1jz ma61 overheating	Sat, 07 December 2002 09:42

I typed this up on Thursday but couldn't post it cause the site wasn't working. Also it is bad for the engine running too rich as it does in limp mode eventually (thats why you gotta fix it now)rinse the oil from the bores because it is running so rich. This will increase engine wear dramatically. Anyways here's was i said. " Man i been saying this from day one for that car, actually before the 1jz was even put in. Get rid of that crap factory ECU. This will be most likely your overheating issue. You know how the car is running in limp mode as I told Michael as well, it reduces the ignition advance and increases the injector pulsewidths. Engines that have a lack of ignition timing have major overheating issues as the combustion process is still occuring when the exhaust valves are opening into the exhaust manifold instead of back in the head. The massive increase in temp there causes the whole engine to become very hot through the cooling system. Correctly advanced ignition timing ensures the combustion process occurs as thoroughly as possible before the exhaust valves begin to open. Compounding the problem is the increased fuel being injected as a result of the limp mode problem. This over fuels the engine and exaserbates the prolonged combustion process into the exhaust making it worse. Send the factory ECU to the bin,get a manual 1jz ECU or better still get an aftermarket ECU to unlock all that extra power hidden somewhere in the 1JZ. " [Report message to a moderator]

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