Pyrometer temps

[vstrom]

So I've finally put in my pyrometer/boost gauge and I'm looking for what everyone is getting for highway temps. If you have numbers for a relatively level highway driving at about 105kph put them up.

I'm amazed by how fast the temp climbs and a little dismayed about how I was driving it before.. I thought I was babying it but it looks like I wasn't.

Right now I'm getting 800-900F on the highway and any small rise it's pushing 1000F. With a constant 10psi of boost.

I think my overall fuel screw on the injector pump is set too high.. but I've done some adjustments and a quarter turn back means it almost has to be floored in order to keep highway speed.

I've got a few more adjustments I may make now that I have the pyrometer in.. this link has some really good info:
http://www.landroverweb.com/Pdf-files/T ... _Rev_2.pdf

As does this:
http://www.fourwd.org.uk/bosch_ve.html

Curious about your numbers..if y'all have close to the same then i don't know have you drive these things around real hills!

[Jedidiahwiebe]

Very freaking slowly. That's how.

105 hwy speed? Fogetaboutit.

I haven't regretted it, nor blown any heads since I slowed down to 90.

[FalcoColumbarius]

I think my overall fuel screw on the injector pump is set too high.. but I've done some adjustments and a quarter turn back means it almost has to be floored in order to keep highway speed.

Quarter turn is too much. Also, more diesel doesn't guarantee more power, just as less diesel doesn't guarantee cooler operation. More air in the ratio, more combustion; more combustion, more heat. It's all about balance. When you turn that screw you should be thinking along the lines of degrees, as in three or four degrees. You got to think about the chain of events your actions may incur. The mixture of air to fuel, how much fuel is getting squeezed through the injectors, &c.. Also, there is an optimum compressor PSI for the turbo. If it spins too fast it doesn't collect as much air. One other item to contemplate ~ if you turn the fuel up high enough it can become a runaway diesel.


Falco.

[vstrom]

I think my overall fuel screw on the injector pump is set too high.. but I've done some adjustments and a quarter turn back means it almost has to be floored in order to keep highway speed.

Quarter turn is too much. Also, more diesel doesn't guarantee more power, just as less diesel doesn't guarantee cooler operation. More air in the ratio, more combustion; more combustion, more heat. It's all about balance. When you turn that screw you should be thinking along the lines of degrees, as in three or four degrees. You got to think about the chain of events your actions may incur. The mixture of air to fuel, how much fuel is getting squeezed through the injectors, &c.. Also, there is an optimum compressor PSI for the turbo. If it spins too fast it doesn't collect as much air. One other item to contemplate ~ if you turn the fuel up high enough it can become a runaway diesel.

Falco.

All very good points. Now that I have the pyro/boost gauge I'm much more willing to tinker with my IP a bit.

Where I live, the highway isn't really dead smooth but has relatively constant little hills that climb or descend maybe 50 feet. Before I had this gauge, and the way the fuel was previously set, I didn't really have too many issues going up these little rises. But then you throw the gauge in and you see just how fast those temps climb .. so I turned down the fuel screw. Maybe a little too much since now I almost have to floor it to get up those hills. Like you said I'm just searching for a nice balance of fuel/temp/smoke/power.

I'll be trying some ideas as time goes by and update this thread.

Also.. any numbers would be great in determining a highway cruising temperature range.