What is the best engine running temperature?

[180bfj20det]

I have my thermos set to have my engine run a 90 degrees as this when the frist thermo on an FJ20 kicks in. But I would like to know what the best temperature is for an engine to make its best power and be reliable.

Thanks

[Abo Bob]

I heard it was 82 to 86 degrees. Very fussy person said this, relating to my car.

[Evo_Lee]

All depends on the engine, course all engines have a tolerance for operating at a little higher temperatures.

But I would keep the engine temp at whatever the temp of the engine runs when stock, thus while you do modifications run different oils, coolants dependant on season, larger oil cooler, radiator, cooling plates, air ducts, vents...actually cool tuning as it's known in Japan is a completely different look at performance and maintenace of your engine.

[Savman]

U don't want to go below 70 degrees for water 80 for oil. As long as your above that your car is warm enough. As for the best performance temp, don't know.

[fresh]

my mechanic put in a different thermostat which runs my car at 74 deg (water / oil i dunno) this is about 10 degrees cooler then stock, doesn't seem any different, might be usegful at the track, but is this bad ???

[ibuckout2]

after many years of trouble with this in my commodore w/ worked 253, you need to run water at about 80 hot enough to disperse moisture in the rocker covers, but cool enough to keep performance to a tops, the cooler the temp, the better the performance

[Cubes]

It vary's for each motor.

I remember being told my old VS 5ltr made best power at 75degree's.

BUT with the lower temps you also loose a little economy.

ibuckout2... I tend to agree with your comment 'only milk and juice comes in 2 litres'

[jvs007]

"ibuckout2... I tend to agree with your comment 'only milk and juice comes in 2 litres' "

obvioulsy u havnt properly been introduced to the rb20 yet ....... :-)

[Cubes]

heheh...

Rb20's are a good thing. Not as nice as rb25's or 30's but definitely a nice motor.

[180bfj20det]

Just to let you know, I've never been beaten by a V8, RB25 or RB30-powered car on the street and that's with my old FJ20 setup (everything standard apart from cooler, cpu and exhaust + boost)...The only thing that beats me is a modified GTR and oh yeah, some rotaries. So I'll let you ponder on that bias slogan if you want, but as they say, winners are grinners and Im certainly grinning. My car gets either good remarks or bad one's, the bad one's mostly from dickheads in their commodores with crappy NA engines trying to break the 200hp barrier. Just because an engine has cubes, doesnt mean its good, but cubes can be good.

Don't knock what you can't beat.

I respect all performance cars and everyone's personal choice. It may be your personal choice to like large engines, but you dont need to undermine the smaller counterpart...There are a lot of excellent 2L engines out there, some that can make 600hp reliably. Just for matter of interest, where does your bias come from and what leads you to pay out the 2L clan???

Hope I didnt offend anyone.

[Cubes]

I don't think any 1 is really 'paying out' 2ltrs. Its harmless stirring.

I had great fun in mine. I felt the need for Diesel power. lol

Which the 3ltr sure does feel like it with the stock turbo turning the wheels as it hits 2300rpm on 11psi.

[180bfj20det]

I don't think any 1 is really 'paying out' 2ltrs. Its harmless stirring.

 

I had great fun in mine. I felt the need for Diesel power. lol

Which the 3ltr sure does feel like it with the stock turbo turning the wheels as it hits 2300rpm on 11psi.

OK dude.

How much torque you making?

Cheers

[Cubes]

OK dude.

How much torque you making?

Cheers

I haven't had the motor on an engine dyno.

Nor has it been on a regular dyno as its only just run in. lol.

You can't compare dyno torque figures, cars run different final drive ratio's, tyres etc, all of which affect the dyno's tractive effort reading.

A comparison could be made if the wheel speed of two cars on the dyno were the same.

It will get a cheap tune on the rb20det turbo soon.

I'm curious as what sort of power it will make with the stock turbo.

I have known of other RB30DET's running the RB20DET turbo on 11psi make ~170rwkw with peak power around 3700rpm. After that the VE drops dramatically and power noses over. Thats the limit of the rb20det turbo.

RB30 + small rb20det turbo = bad top end flow.

Without being tuned it does appear to go fairly hard. Low speed 3rd gear corners coming on to boost will spin third gear and send you sideways.

Its a strange feeling having the motor sound like its not reving/doing anything, yet you hear the wheels squeeling.

After I push the rb20det turbo to its limits I will bolt on the GT35R .82.

From the experience of others I expect the GT35R .82 only just make 1bar by 3500rpm.

Guestimating 1bar of airflow at 3500rpm from the GT35R 'should' be around 180rwkw.

If it feels a little laggy I will throw a .62 on it and be happy with less top end but better spooling.

According to the turbine map a GT35R .62 flows the same as a GT30R .82 and the GT35R .82 = GT30R 1.06.

The 3ltr at 3000rpm only just keeps the GT35R .62 out of surge if running 1bar. It should work well.