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Well, I have a spare rebuilt wastegate turbo set up withe larger LDS465-2 compressor and housing ready to bolt on..... And I turned the fuel down. As to the head flow capability. Does anyone actually have any numbers?

I was able to trigger the air filter minder with a used air filter and the wastegate turbo; never with the C or D turbo. Did not happen again with a new filter. I will be installing a Murphy gauge with pointer to record the actual air filter restriction. I tried the LDS465-2 turbo and it...

I am thinking about taking the larger compressor wheel from the LDS465-2 turbo and putting it on the LDS465-1A wastegate turbo. Any technical reason not to do this?

The 3.5" U-shaped tube from the air filter to the turbo's inlet.

The intake tube from the M35A1 fits perfectly and is available from Memphis Equipment. Can't seem to post a pic, though.

In case anyone is curious about the sound of the different turbos... In order of increasing noise: 3LM-39 (aka D), 4LE-456 (LDS465-2), 4LE-354 (wastegate), and 3LJ-319 (aka C).

The 4LE-354 (wastegate) turbo achieved about 12 psi peak. I try not to run past ~1000°F and I don't take the rpm to the redline. The 4LE-456 didn't perform very well when used in this manner. The most boost I could get under the roughly the same conditions was ~8psi. Very little boost at...

Schwitzer 4LE-456; 11641831-1. Divided inlet; each half feeding 360° of turbine. The diffuser has vanes. Appears to have the same turbine as the 4LE-354 but has a larger diameter 60mm inducer and taller exducer blades.

Schwitzer 4LE-354; 10945184. Wastegate turbocharger. Divided inlet; each half feeding 180° of the turbine. There appears to be two different compressor inducer sizes. This one is 57mm, my other (with damaged turbine) is 54mm.

Actually, I was going to slightly turn down the fuel and be happy with it. However, I just bought a brand new 4LE-456 (LDS-465-2) turbo for relatively cheap. That turbo has a larger diameter compressor inducer, taller blades at the exducer, and a vaned diffuser. Gonna try this one next. I...

it took some patience, but I found a rebuilt 4LE-354 (LDS-465-1A) turbo and installed it recently. It does make a difference. With the 3LM-39 (D-turbo), the boost came up quick but so did the EGT. My FDC is compensated, and going up a hill, I would have to take my foot out of it pretty...

I talked to the folks at a regional turbo repair shop. They brought up a few points: -This is a very old design (384 were built in 1969). -While rebuild kits for a basic 4LE are available, housings and turbines are no longer supported by Borg Warner. -Very few turbos had wastegates during...

Turbo is shot. Turbine blades broken and nozzle ring damaged. Parts for this turbo are non-existent.

I found two pieces of the wastegate valve seat in the turbo. Looks like it has been that way for awhile. Going to rebuild it.

Well, I put the D turbo back on. The best that I could get out of the LDS turbo was 8 psi and that was with the FDC bypassed and the temp rising fast. Swapping the D turbo back on with no other changes yielded 13 psi and much lower EGT. I suspect that the wastegate valve is leaking or the...

I believe that the compressor outlet was 3". It requires a different intake elbow. I won't be able to get back to the truck until after Christmas; will post something then.

I did the swap over the long weekend. The turbo clears the starter solenoid in its stock position by about 3/8". I am sure that it would be better to clock the starter but there was no apparent heating of the starter (cool to the touch after running down the road) The LDT oil supply line...

Perhaps, "lug" was a poor choice of words. Do you have first hand experience with this turbo which suggests no improvment over the C/D?

Both. I was the lone bidder at $79 on ebay. It was mis labeled as an LDT turbo. Between work, school, family, and the fact that my truck is 2 hours away, it is hard to get much done on it. Very much looking forward to your results. I don't agree. Ken posted that the increased boost at...

Got it in the mail today. It appears much bigger than the C or D turbo; wish I had one to compare with right now. The inlet is 3.5" anybody know the input size of the C or D? I seem to remember that the intake tube on the deuce necks down at the turbo? The outlet seems like it is...