02-04-2012, 08:06 PM
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CC Member
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Join Date: Jan 2007
Location: Melbourne,
VIC
Cobra Make, Engine: Harrison, 6.0L Chev
Posts: 2,513
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Not Ranked
Not running hot enough?
I took the Cobra down to EFI Dynamics during the week and Erol had a look at the tune to make sure everything was in order before I re-attempt the IM240. It made 230kW at the rears which I guess is OK for a stock VE tune and VZ cats. He altered the fuel maps a little to compensate for the non-factory intake and MAF position, something about trimming the fuel a little earlier to make it as close to factory as possible.
He gave it a few pretty hard runs on the dyno and the engine temp didn't get much over 80 degrees. As we know, modern engines are designed to run at about 95-100 to burn off as many pollutants as possible. He suggested running a hotter thermostat or restricting flow through the cooling system somehow.
Given that the IM240 has been relaxed to meet ADR 37/01 at 100% (ie, half the previous levels?), is a 10 degree temp increase going to make the difference between pass and fail? I'm thinking no.
A new thermostat is $70 plus whatever coolant I need to replace. Peace of mind I guess?
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