What to do next?

[90cumminscoal]

Hey guys I've got a 1990 with 5x14 sdx injectors, 366 spring, he351cw, air dog 150, devils own stg2, mighty diesel 70psi head bolts and mild pump work . I was wondering what's next I'm just wanting a play truck I've got a 2nd gen manifold I can put on but don't know if I'd benefit from it. The he351cw that's on I don't really like so would like opinions on that thanks.

[skilletky]

heavier valve springs, 4200 gov spring, 62/71/14, some of tim's tubz, and a clutch or auto trans/ converter upgrade. depending on if its a auto or manual.

[skilletky]

what dont you like about the 351?

[90cumminscoal]

Sorry about that I have a sb double disk. The he351cw doesn't feel like it gives me the power I'd like boosts great and all but I don't think there enough volume of air.

[90cumminscoal]

Is the 62/71/14 an s300 if so where do you fine them turbos are they an aftermarket turbo or did they come off a certain rig?

[The_Head]

Yeah, they're an S300 turbo. Pretty sure it's an aftermarket turbo only.

What is "devils own stg2"? Is that water-meth injection?

[Tacoclaw]

Valve springs, tooth jump, and throw a 72-75mm turbo under that HE.

[RCCUMMINS89]

My vote goes for the 62fmw... best turbo I've been around.

[90cumminscoal]

Yes w/m kit. And I thought about jumping a tooth but didn't know if I was to that point yet. That gov spring is pretty high ain't it? And what valve springs to go with, should I do the exhaust and intake the same?

[RCCUMMINS89]

If you are going to do valve springs, yes.... do both intake and exhaust. Toxic Diesel valve springs are the most affordable and seem to be quality (haven't heard of any issues) otherwise go Cummins.

If you ever plan on going big enough to need a tooth skipped....do it now. If it's too much timing, rotate the pump back all the way and it puts one about the same as stock and 1/4" bump.

[90cumminscoal]

Ok thanks. Now on the s300 turbo what's different on the install?
What's case pressure and how do you check it?

[skilletky]

Ok thanks. Now on the s300 turbo what's different on the install?
What's case pressure and how do you check it?

you will need a 4 inch downpipe with the hx40 flange to installe the s300 turbo. case pressure is how much fuel pressure is in injection pump. it is not the same as the fuel pressure coming from the airdog lift pump. definatly jump a tooth on the timing. you can mess with case pressure regulator on the injection pump by knocking the pin in a little bit. but only do it a little bit. i wouldnt really recomend it unless you just want to mess with things for the hell of it. i knocked mine in pretty far, could definalty tell a difference, but it also created fuel leaks from the pump. i have no idea what my case pressure is, mainly because i dont care enough to check it.

[RCCUMMINS89]

x2

[1992gen1_fan]

Yes w/m kit. And I thought about jumping a tooth but didn't know if I was to that point yet. That gov spring is pretty high ain't it? And what valve springs to go with, should I do the exhaust and intake the same?

Atleast 60# with a 4200 gov

[90cumminscoal]

Ok thanks guys. 1992gen1_fan I'll check my turbo when I get back in if it's still good I got a kid wanting to buy it then I'll upgrade to a s300.