3406b turbo upgrade

1st thing is get that 1/4 hole advance back to just fast pin time. Or with flywheel pinned you just want enough line showing coming up from bottom in pump hole it won’t go in. A 4MG is 18 degrees already. At a 1/4 home you’re looking at 24 to 26 static an 36 to 38 possibly 40 all in. As far as turbo the 78 in a 1.45 is gonna light slower but will pull better in the higher rpm. For over the road type work that’s heavy I would go that route. The 1.32 housing is too small and overspeeds the compressor wheel. Causes explosions. It’s got a list of other things it causes too but that’s the main.
For short haul stop and go the 177148 is your better option. Sorry there is no best of both worlds unless you go compounds

 

It will crack the be Jesus outta pistons. Not all B models are the same. They start at 24 degrees initial timing and go down to 9.5 with the mechanical C. So the 1/4 and half hole blanket advice doesn’t work. On an 11degree pump cam the thickness of your average finger nail showing in bottom of pump window is from 14 to 16 on the meter. If it rattles down low it’s for sure way to advanced.

what I’m getting at is a 1/4 hole is too far even for the ones that are slow timed but they will stand it better than one that’s a 1/4 hole advanced at 18 degrees.

 

The O749 is a tighter micron filter than the B come out with. The original upgrades to it and is no longer available thru CAT. If you’re only coming down to 28 or so you’re good. Some do some don’t etc. if it sounds sweet run it. But it’ll happen and most likely other than some extra blowby you’ll never know till you tear it down for another issue. Timing meter best thing I ever invested in.

 

I'd go for a better combo.. Sxe- 480 80mm billet combined with a 96mm turbine and the 1.32 housing

Good spool, lits of airflow and lots of flow up top on rpm still.


The 88mm turbine is too small and doesn't flow good so a 1.45 masks the problem

 

Keep putting that 1.32 housing on a 14.6 and keep exploding compressor wheels.
Next the 78mm I am referring to has the 96mm turbine. Part number is 0001 or 0002 already loaded in a 1.45 housing or you can purchase it as a super core and put it in a 1.45. I run a 410 frame with billet compressor wheel and 360 degree bearings. In all of that what makes you decide I’m running it on an 88mm exducer if it’s cause I meantion the 177148 that’s cause i don’t give blanket advice and depends on how you use the truck to what actually works best. At any rate that 80mm compressor is too much for 90 percent of the mechanical CATS out here. You’re masking that sticking it in a 1.32 housing l. A 1.32 is too tight and won’t flow the exhaust out like a 1.45 will. Sure it lights quick then over speeds and just starts making heat not power. My motor sure it would run an 80 and do it in a 1.45 I actually have had an 82 in a 1.45 on mine. Boost and quick spool doesn’t mean horsepower necessarily. Without truly knowing his setup and what he expects out of the truck there is no way of knowing a “better combination” I can promise you the 80 in a 1.32 isn’t it.