Allis 7040 turbo

I guess the first logical question would be, why ?? If you aren't increasing the fuel delivery, why change the turbo ??    If you have a Rajay brand turbo, it may need replacement, as they weren't nearly as long lived as the Air research brand.  An 8030 turbo would be a nice small change but NOT a bolt on. It is the same as 8050-8070-7080-7580-4W220 and it made for 220 flywheel HP right out of the box.

Edited by DrAllis - 29 Aug 2024 at 1:23pm

That would be right, Lynn. !!!

An S200 is a great upgrade to those tractors, I've sold a few to guys that I set up their fuel systems on these. Much easier to fit on a 7000 series tractor lol!

Factory turbos are designed to start building boost a 17-1800 RPM (except 7080/7580/8070) and the more RPM you have, the more boost there is. I had a customer 40 years ago that had a 7020 and HATED it !! compared to his trade-in 200 tractor. His dealership had worked on it with zero improvement. He brought it to me and within 30 minutes he now LOVED his 7020. Problem ?? injection pump was timed at 20 degrees BTDC instead of 18 degrees and I placed it at 16 degrees and boost came in much sooner and was a completely different tractor.

Nothing is a direct bolt on replacement except the T04 replacements I sell. The S200 uses a V-Band exh outlet, so you have to fab up a new exh outlet/stack, but with a huge oval hole in the hood, it's a piece of cake. I also sell flange/clamp and elbow if needed. Sometimes that stuff is hard to find locally. The crossover pipe will need some modification, as this turbo sits a little different. The oil inlet can be made to work with slight tweaking, oil drain requires a little bit of grinding on the oil drain pipe flange and exh manifold if I remember right. The connecting air cleaner will require adapring up to the 3.5" hose connection. The S200 is a modern MAP groove turbo, which when paired with the correct size exh housing will spool up a lot quicker, for excellent response. 

High idle no-load boost is irrelevant.    8030 at full load 2300 RPM should be 13 to 14 psi boost......8050 at 2300 full load 15 to 16 psi boost......8070 at 2400 RPM should be 18 lbs boost.  All at 60 to 70F degrees air temp.

It is, fine

totally different S200 than I referred to, I'm referring to the S200SXE super core series. That one is wastegated, which probably isn't a bad thing if got it right lol.