Recent content by Dougal

Those EGT are unrealistically low. Do you have a probe that's in a cold location, too short or even post-turbo? IDI engines put a lot of heat into the heads (which is why they crack). The cooling loads on a 1HZ are a lot higher than a 1HD-T for the same power.

The pumps on the 1HD-FTE's seem to do 400,000km without any dramas on the ULSD we run here. I wouldn't be overly concerned about the FT.

Fascinating results. Shame you can't overlay boost on the graphs. Have you seen a change in boost response? If you want to make a big change in your turbo. Get one with a newer generation turbine wheel: https://www.4btswaps.com/threads/turbocharger-turbines.77250/

1HZ will run on 25% water. It's the least sophisticated injection system around. Doesn't need additives. If you get caught with a tank of summer diesel headed into winter. Sure you might need some anti-gel. I've added petrol to diesel to solve that. Diesel fuel has lubricity limits and it...

The only things a tune can do to help spool is over-fuel and retard timing at that rpm. If you're at sea-level you can get away with it. If you try to tow or climb hills it just gets hot and smokey. If you spend any significant time driving in that rpm range it will hurt fuel economy too.

The dead spot will be lack of boost. The only way to fill that is a more active turbo.

A GTX2871R is going to be a high rpm turbo and not going to give the low rpm boost that diesels need. Probably not much different down low to stock. Maybe even worse. A better turbo is the answer.

Isuzu parts supply in the US is no problem at all. The engine was used in Isuzu and GM badged trucks, either dealer network has you covered. Biggest hassle with the Isuzu is gearbox adaption. Worth asking.

That's my experience with other diesels too. A client of mine has a JCB industrial diesel powering a water pump. Thing runs over 30psi boost stock. During install the pump was never lined up with the motor correctly and the resulting vibration broke the intercooler and dropped all boost...

You'll need a different injection pump to get a road engine governor. Here is a thread listing everything you need for different clean and safe power levels in a 4bt: https://www.4btswaps.com/threads/power-recipes.94929/

Yes it would.

I just realised this engine was rebuilt. Any chance the pump drive gears were installed a tooth out? A tooth retarded would give you high egt and low power.

Or perhaps just running twice the torque the engine was designed for......... As long as you're aware. Lots of people think extra power is free. It was @gerg who said it was like giving grandpa meth and seeing how much he can bench press!

Time to put some guages on it. If the pressure is good but no power to the compressor it could be a bad low pressure switch. It could also be a straight wire problem. If the expansion valve has failed open the compressor will run, pressures will stay low and you'll have some cooling but very...

It's not EGT you should be concerned about, it's mechanical strength. Feeding intercooled 20psi into a 3B is a big risk to the crank.