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Old 09-26-2010, 02:36 AM   #1
SKT
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Default H6 Forester + Vipec - Engine Temps?

Heya all....... I've had my Forester with the H6 transplant on the road for over 6 months now and goin pretty good. I've had a few tunes on the Vipec to try and get some fuel economy out of it but its not looking too good at the moment.

My main concern is engine temps. My tuner said the ECU log showed a regular temp of 100-110 celcius just cruisin around and a spike somewhere of 133. Pretty alarming really. Looking into the Vipec software I'm asuming he's talking ECT which I think is Engine Coolant Temp...?? I'm not sure about either of those facts because I've just started looking into it myself.
I've recently installed a digital display engine temp sensor with pre-setable alarm. I mounted the sensor under a bolt right on top of the block just behind the alternator. I am seeing temps of 90-101 celcius once the engine is warmed up and doing general duties around town. That is obviously off the block and not coolant temp. The tuner says I need this sorted. I'm trying to ascertain what are acceptable engine temps for a H6. Its a '02 motor with less than 100,000K on the clock before the transplant.

Any info would be much apreciated.
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Old 09-26-2010, 10:15 AM   #2
Patrick Olsen
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I have much of the EZ30R factory service manual (FSM) downloaded, as (someday) I'll be installing an EZ30R in my Legacy. According to the FSM, the EZ30R thermostat starts to open at 80-84C and is fully open at 95C. So, your coolant temp should logically stabilize around 95C.

What are you running for a radiator and fans? Do you still have an AC condenser in front of the radiator?

Can you mount an actual coolant temperature gauge, or is it possible to get real-time readings from the Vipec? I don't think the block temp is telling you much of anything worthwhile. I know the EZ30's coolant routing is different that the EJ 4cyl engines, but just as an example on my EJ25 I drilled and tapped the coolant crossover and installed an additional sending unit to feed my DEFI DIN gauge pack.

(I don't know which generation of Forester you've got, or what the interior looks like, but if you've got an extra DIN location, that DEFI setup is pretty slick. I think it's about perfect for someone who wants some useful gauges but doesn't want a gauge pod on top of the dash or on the A-pillar. It'll monitor a pressure and 2 temperatures, so I do oil temp and pressure and coolant temp.)

Pat Olsen
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Old 09-26-2010, 05:07 PM   #3
SKT
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Quote:
Originally Posted by Patrick Olsen View Post
What are you running for a radiator and fans? Do you still have an AC condenser in front of the radiator?
It is the stock radiator and I do believe the AC condensor is in front. I've checked the hose temps top and bottom after a drive around and all seems normal to me.

Quote:
Originally Posted by Patrick Olsen View Post
Can you mount an actual coolant temperature gauge, or is it possible to get real-time readings from the Vipec?
I can get real time data from the Vipec when hooked up to the PC whilst operating. I have watched it briefly with very high 90s common.

Quote:
Originally Posted by Patrick Olsen View Post
I don't think the block temp is telling you much of anything worthwhile.
I knew the sensor I installed would not give the temps the coolant sensor would but I was interested in seeing the changes and this setup has a pre-setable alarm giving me some warning.

Quote:
Originally Posted by Patrick Olsen View Post
I have much of the EZ30R factory service manual (FSM) downloaded, as (someday) I'll be installing an EZ30R in my Legacy. According to the FSM, the EZ30R thermostat starts to open at 80-84C and is fully open at 95C. So, your coolant temp should logically stabilize around 95C.
Any chance of geting hold of that manual?
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Old 09-26-2010, 06:58 PM   #4
Patrick Olsen
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Quote:
Originally Posted by SKT View Post
It is the stock radiator and I do believe the AC condensor is in front.
"Stock radiator" meaning stock Forester radiator, or stock EZ30R radiator? I'm not sure it would make a difference, really, as the core sizes on Subaru's radiators all seem to be about the same. Actually, looking at the FSM again, it appears the H6 uses a 27mm core (just over an inch thick), while the H4s I think are only 5/8" thick. So if you're still using the original Forester radiator that could be part of the problem.

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Originally Posted by SKT View Post
I can get real time data from the Vipec when hooked up to the PC whilst operating. I have watched it briefly with very high 90s common.
So that's no too terrible.

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Originally Posted by SKT View Post
Any chance of geting hold of that manual?
I paid to download it here. I'm not deadset against sharing it, but each section of the FSM is divided into multiple separate PDFs, so I've got dozens of them. I really don't have any easy way to share them.

Pat
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Old 09-26-2010, 08:30 PM   #5
SKT
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The rad is the H6 rad. I know this because there were some mounting mods done to fit it due to the way the rad fits and the lift I'm running.

As for the manual. I appreciate where you are coming from thanks for the link I'll d'load sections as I need them.

As for temps.... High 90s sounds pretty high to me. I am trying to sort out the vipec and d'load a log. I know it keeps one because that's where the tuner got his info regarding my temp spikes etc. More digging needed I think. I am going to have the car looked at by a local Suby mech just incase there is something simple in the cooling system stuffingit up. Thx for your info thus far mate.
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Old 09-26-2010, 11:32 PM   #6
Storm
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What kind of timing are you running? If you're running alot of advance, your temps are gonna climb some as a result.....

Jay
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Old 09-27-2010, 12:04 AM   #7
Patrick Olsen
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I agree that high 90s seems a bit high, but if the thermostat is fully open at 95C, then high 90s isn't really, really high compared to that. The 110C that your tuner saw, and obviously that 133C spike, are well above normal, but high 90s isn't too horrible.

I think it is worth noting that the EZ30R's cooling system seems designed to run a bit warmer than an EJ25 - the thermostat settings (for starting to open and fully open) are 4C higher than the same settings for my EJ25D's t-stat.
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