turbo

I have been looking at the same turbo for my 301 with 7080 tips and pump set at 250cc of fuel and turning 3000rpm,   here's what I have looked at its a Borg warner s300gx its for a 1994-2002 dodge Cummins it will support up too 400hp I have a friend that big in the truck and diesel drag racing industry builds lots of turbos for people out there sized this up for me on my specs it looks like it would do fine, I think injected ED on here runs a s300 on his allis 220,here's what I have ran in the past t04b480 airesearch clamp on v band style compressor housing junk!! here's what I have been running the last part of the season airesearch t04b35 its a 62mm inducer 70mm exducer 57 trim wheel with 60 to 1 housing, turbine side is 70 mm inducer to 65mm exducer p wheel with a 81 air ratio housing seems to run strong it was build for the 6.2 chevy diesel as a aftermarket turbo kit by ATS and Banks some IH dt466 used them as well, it would be nice if some people shared there set up on there 301 as well not like we all live with in 50 mile from each other and pull against one other, for sure theres someone out there that has some info on this for us. ps this turbo I am run looks factory as well, same look at a t04b80 with the 60to1 compressor housing.       

If you go with a .450 pump I would move up to an HX40. At least two different turbine wheels to pick from, a few different turbine housings, and a few different compressor combinations. If you use a .450 pump, an intercooler, have the cylinder head ported and run open RPM you might even try a 65mm HX50 but that would be pushing it with the Roosa pump. Use a tight turbine housing on whatever you choose.

Nothing wrong the a S300 either, I'm just a fan of the Holsets.

Edited by O.P.S. Heads - 06 Nov 2015 at 3:08pm

Just about any way you go you will be a head of a airesearch turbo hers the specs for a hx35 57mm inducer with a 60mm exducer 574cfm max power it can support 330hp hx 40 flows 763cfm it will support 440 hp max according to holset what you want to run is up to you, if it was me I would go no bigger than a 62mm inducer and a 14cm housing the hx40 would give you the best of both worlds really 60mm inducer and a 14cm housing should run pretty sweet what kind of power are you make with your hx35 know? p.o.s heads has the right idea on the exhaust housing stay small with the hx40 stay around 14cm a 12cm housing you may drive it to the choke point or worse pop one of the wheels in it from over driving it, stay away from the hx35 40 hybrid's they are famous for busting shafts when they get barked seen several die this death in my early diesel truck pulling days its not very pretty at all, what makes them do this is you have a big wheel on the inducer side and a small shaft from a hx35 on the exducer side im not say you could break it but not worth the chance of really messing up a good engine,they are well know to be weak.     

The shaft size for a 35 and 40 are the same. Same rebuild kit, same 7mm compressor wheel bore, same thing. The turbine wheel(s) for a 40 are larger.

I would not use the 35 / 40 hybrid. Not enough turbine wheel to turn it effectively. Dodge pickup and Jap car tuner forum pipe dream.

It all depends on fuel delivery, cylinder head flow, intercooler or not, open RPM vs. 3,000. There are a few important variables for deciding the correct turbo.

If you stay with the same pump I wouldn't change a thing. If you go to a .450 then a larger turbo would do you some good or at a minimum a looser turbine housing should be used on your existing turbo.

Edited by O.P.S. Heads - 06 Nov 2015 at 7:02pm

Would a hx40 with 16cm housing be to much with 450 pump apparently 14cm harder to come by

3000 rpm limit

You need bigger injector tips than "509"'s....you need 4 hole .020" and bottom out the internal leaf springs on that 7580 pump.

4 hole X .020" are custom made and adjust to 2500 to 2800 psi.    Bad 370(I think) isn't any better than what you have.

OK try guy I look in to it this winter on get bigger inj and see if that will help it out some .

In my area there's  a D21  with 3LM466 box turbo, 450 roosa pump, externally pressured, PSI ? 5 hole .020 custom Bosch dual feed injectors, custom registry,hold down plates .093 lines, custom cam. 1.75 rocker arms, stiffer valve springs  3,000 rpms, 12.5 mph, 10,500 lb. class. It rules this class,against  IH 466 cu. Am. Bosch pumps, case 504 cu. cases with A pumps.

The rules for there association,is limited to A 3LM466 box turbos, so that limits the amount of fuel you can burn, to make the HP. So the engines have to be more efficient to make the HP. More cubic inches isn't the answer here, as the turbo, won't have the CFMs.  To my way of thinking, it's making the guys with the most engine building ability the winners, as long as the tractor can get the power to the track.