1993 12 valve boost?

[TRACTJDS0428]

what is the normal boost on a 12 valve with a non waste gated turbo? mine is completely stock and 25 to 28 psi is as high as mine gets. what is a good first upgrade and what kind of money am i gonna spend?

[Tacoclaw]

viewtopic.php?f=4&t=12300

If you've already done everything in that thread, then a big air filter and 4" exhaust are the next mods usually.

If you've got that, then I guess te next question is what do you use your truck for?

[TRACTJDS0428]

thanks for the link. lots of great info. still didnt see the stock boost numbers?
Also having a really hard time finding the low pressure lift pump. i went to oregon diesel and couldnt find it. does anyone have a part or kit#?

[cmann250]

Here's what I got by crossing numbers. You'll have about another $80 wrapped up in the spacer plate, line, gaskets, etc. if you go this way.

It's HFP702, towards the bottom of the page http://oregonfuelinjection.com/index.php?pid=32

[BILTIT]

I think your doing just fine if your getting 25psi of boost. I was getting 12psi with my stock 21cm H1C and i am now getting 28psi with my he351cw with 9cm2 housing. All with stock pump settings.

[Tacoclaw]

Oh yeah I didn't really mention boost numbers, huh?

I'd say you're doing alright for an IC'd truck. My non-IC'd '90 would just edge out a 35psi gauge with it's stock 18cm turbo and injectors, but it wasn't doing itself any favors up there.

[TRACTJDS0428]

OK. I found the pump. There is a thread on here that shows part numbers for a lift pump install. Are those the numbers i will need for the line and spacer plate....... or does oregon have a kit for the switch?

[cmann250]

I got mine from Cummins. Those numbers are old, but they will cross to get the same thing

[TRACTJDS0428]

I think your doing just fine if your getting 25psi of boost. I was getting 12psi with my stock 21cm H1C and i am now getting 28psi with my he351cw with 9cm2 housing. All with stock pump settings.

my truck has always made 20 or higher so could i have the 9cm housing? how would i know. i know it had some power work before i bought it but dont know what all was done.

[TRACTJDS0428]

I got mine from Cummins. Those numbers are old, but they will cross to get the same thing

Thank you! you have been a great help.

[cmann250]

You're welcome If you have a stock turbo, you have an 18cm housing or maybe a 21cm housing. I'd bet it's 18

[TRACTJDS0428]

I called my local dealer and they can get me all the swap parts except the spacer plate. the part number on here doesnt work they say. Could anyone get me a measurment on the exact thickness of the spacer so i could machine my own? Or a known good part number for the low pressure piston pump spacer needed for the swap from a diaphram style?

[cmann250]

I took all those numbers to Scheid and they had no problems. Double check them, I often write things down wrong lol

[BILTIT]

I think your doing just fine if your getting 25psi of boost. I was getting 12psi with my stock 21cm H1C and i am now getting 28psi with my he351cw with 9cm2 housing. All with stock pump settings.

my truck has always made 20 or higher so could i have the 9cm housing? how would i know. i know it had some power work before i bought it but dont know what all was done.

As said above you probably have the 18. Pump may be turned up alittle aswell?