4.6L (1996-2004 Modular) MustangTechnical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within. Sponsored by Cruizin Concepts
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I put a 170* in my 04 GT a couple months ago cause my gauge before would always read 3/4 hot and when i drove without the A/C on I could always feel hot air coming from below by the pedals. Here in texas its obviously gets hot so it usually stays around 180 when its hot.
I have just basic bolt ons, no cats/offroad xpipe, etc, so is there anything I should change to accommodate for the lower temp. I have a diablo tuner and its just set on the 87 performance, might start running 93 again. Other than that though can/should I change spark timing? Car has 115k on it if that matters and is a DD.
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The link at the end of the article explains what you are seeing on the display.
I am reasonably certain that cylinder head temp is actually coolant temp.
My Mach 1 has the stock thermostat and according to the Scan Gauge II plugged into my OBDII port, my coolant temperature normally runs at 190F and a little higher on hot days. The temp gauge stays in the middle.
I think 180F is too cold. I'm wondering if your gauge is off.
Last edited by Sonic Mustang; 06-20-2013 at 03:19 PM.
170 might be a little too cold and the pistons/rings might not be expanding and sealing like they should or more cold spots than normal (cold is relative). i have a 180 degree thermostat in mine and the temp ranges from 180-200 when i monitor with a tuner. i'd rather stick with stock but with the non-intercooled blower i experienced some problems on hot days which the 180degree thermostat sorta, kinda, helped with
the cylinder head temp is the coolant temp, i believe the sensor makes contact with the coolant where its at in the cylinder head
I think the gauge is messed up because when the temp is at 170(confirmed by tuner) it stays right in the middle, but then if it goes up to like 176 it will go 3/4 hot. Today I had the a/c off and the fan isn't programmed to come on till what is normal(200-210) so it got up to about 195 and the gauge still stays 3/4 hot.
The thermostat also must allow the coolant to sit in the radiator long enough to actually cool down. If it opens to soon or to often, the coolant starts on a cycle of never getting cooled properly and that actually raises the operating temps of the cars. There is a balance that must be reached when switching from a stock thermostat especially on a stock car.
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