Cheaper Jeeper
Full Access Member
I recently returned from a 2300 mile round trip towing/hauling about 6k-6.5k pounds over several mountain passes. I was very pleased with how my old IDI handled it, but had one concern and I wanted to get some opinions on a possible solution.
The biggest problem I had was keeping the EGTs at or below 1200 degrees. Especially at the higher the altitudes. The higher we got and the thinner the air, the less throttle it took to make black smoke and raise the EGTs. I pretty much had to watch the pyro ALL the time when climbing and constantly modulate the throttle to keep the EGTs down. Up in the 4000 foot + elevations, anything more than half throttle while pulling would raise the EGTs to 1200 degrees in just a matter of seconds.
The weather was dry & warm the whole trip until I crested the final mountain pass coming home - where I ran into light drizzling rain (typical Western WA weather). I noticed immediately that the EGTs didn't climb nearly so fast and I could apply more throttle without getting up to the 1200 degree mark.
Down here at normal elevations it is much more manageable even when the weatheris warm & dry, and it takes 3/4 or more throttle when pulling that load uphill to raise the EGTs. But it can still be done. Same with the black smoke - a lot harder to produce, but it can be done if I put your foot in it. Unloaded, I can just barely produce visible smoke pulling a hill with my foot on the floor and in that case the EGTs seem to top out right at 1200.
I could turn the IP down a bit, but that will hurt my performance under day-to-day "normal" conditions. I'm thinking instead of maybe doing a simple home-brewed water/alcohol injection system. Of course I'd use an oil pressure switch and a throttle position switch (similar to Ziggster's single-stage propane setup) so that it wouldn't come on at the wrong times and flood the engine with water vapor. Wouldn't want to hydrolock my motor. That way I could use it only when needed to lower the EGTs when towing heavy and still have my same performance benefits of the turned up IP for day to day driving.
What do you guys think?
The biggest problem I had was keeping the EGTs at or below 1200 degrees. Especially at the higher the altitudes. The higher we got and the thinner the air, the less throttle it took to make black smoke and raise the EGTs. I pretty much had to watch the pyro ALL the time when climbing and constantly modulate the throttle to keep the EGTs down. Up in the 4000 foot + elevations, anything more than half throttle while pulling would raise the EGTs to 1200 degrees in just a matter of seconds.
The weather was dry & warm the whole trip until I crested the final mountain pass coming home - where I ran into light drizzling rain (typical Western WA weather). I noticed immediately that the EGTs didn't climb nearly so fast and I could apply more throttle without getting up to the 1200 degree mark.
Down here at normal elevations it is much more manageable even when the weatheris warm & dry, and it takes 3/4 or more throttle when pulling that load uphill to raise the EGTs. But it can still be done. Same with the black smoke - a lot harder to produce, but it can be done if I put your foot in it. Unloaded, I can just barely produce visible smoke pulling a hill with my foot on the floor and in that case the EGTs seem to top out right at 1200.
I could turn the IP down a bit, but that will hurt my performance under day-to-day "normal" conditions. I'm thinking instead of maybe doing a simple home-brewed water/alcohol injection system. Of course I'd use an oil pressure switch and a throttle position switch (similar to Ziggster's single-stage propane setup) so that it wouldn't come on at the wrong times and flood the engine with water vapor. Wouldn't want to hydrolock my motor. That way I could use it only when needed to lower the EGTs when towing heavy and still have my same performance benefits of the turned up IP for day to day driving.
What do you guys think?
