TurboTommy

I don't understand this part.

Great info.

Darwantae951

During acceleration, peak temperatures recorded were 49°C. After I stopped accelerating and slowed down, the temps crept up to a maximum of 66°C. Peak speed was a GPS recorded 128mph. After acceleration I used the brakes to arrest my speed back into the legal zone for the highway I was traveling on.

Chris White

Darwin lives in a ‘special’ place….
At 5,000’ there is less to use as a cooling medium (air to air intercooler). Since Darwin is using a boost gauge and MAP sensor referenced to absolute pressures instead of relative pressures he is getting the same “20lbs of boost” that somebody at sea level would get – but he is also getting substantially less cooling (about 85% air density).

So when Darwin does an acceleration run and then brakes back down to ‘legal’ speeds he has a lot less airflow through the intercooler. There is always some lag in the post intercooler temps since the thermal transfer has to go through different mediums (air to aluminum to air) and there is a certain amount of thermal mass to over come in both directions (initial heat up and post load cool down).

All that being said – intake temps on the dyno are much more a function of how well the fans are set up.

DanaT

Those do not seem correct. I forget the values I had, but I think they quickly approached 100C.

What type of a measurement device are you using? You have to keep in mind that if you are using large devices, you have significant lag.

When I measured, I used fine gauge (probably 0.010") thermocouples placed into the airflow. They react very fast. Probably the slowest part was the digital thermometer. If you use monsters, like Zeitronix stuff, they react slowly. You need fine wire to get an idea of transient temp.

-Dana

Darwantae951

That is what was recorded via the Tec, using the recommended sensors.

333pg333

100C ?? That seems crazy high!

Darwantae951

TecGT

refresh951

We have a pretty good fan setup at Dynolab. I went with 150F just to be safe. Darwin sent me a real world WOT pull log. Very helpful.

Darwantae951

Glad I could help!

Chris White

Intake temps are greatly influenced by your turbo. If you are running a stock turbo above the stock boost levels you will see very high intake temps. When you run a turbo outside of its efficiency range the temps go up a lot. Darwin's turbo is right at the sweet spot in the 18-20 range so it doesn't heat up the air charge much.

A K26/6 at 20 psi makes a good hair drier....very hot air!

barks944

Heres some from my 951 on the dyno. I assumed it was due to poor flow through the intake on the dyno as I never saw such high temperatures on the road although clearly the load of the engine is not as high for as long. I intend to go back and make sure there is good flow through the intercooler some how. Any experience with this? Thinking of removing the badge panel or temporary water spray setup as the fan at this particular dyno was not that impressive .

Edit: Turbo in question was a K26/6 with a bigger compressor wheel.

Dyno - Peak of 62 Celcius

reno808

I am going to the dyno next week. I can logs for you if you want

Thom

Here is a log of mine. WOT in 4th gear from ~80 to ~120, bottoms at 20°C and peaks to 40°C. Ambiant temp 15°C.

EGT sensor unplugged as I was measuring (back) pressure in the cross pipe with an external boost gauge.

refresh951

Good point but look to be running pretty efficient with my GT3582R setup. Darwin's setup should be fairly representative.

Thanks. 143 F peak, very consistent with other data.

Thanks Reno. Look forward to seeing your Dyno.

Thanks.

barks944

Happy to contribute towards working on what seems to be a common problem . Cracking stroker build btw Refresh951 <3 that torque curve you must be very pleased!