Engine/Transmission (1994 - 1998) What Turbo Should I Use?

[AMcKee]

I have a 98 12v 3500 4X4. It will have 370s, 3k GSK, good set of DVs, ofe clutch, #10 plate, BHAF, 4" exhaust, just not sure what turbo to use. I need a turbo that will spool quick, and keep EGTs down. I dont want twins. What turbo do you think would work best. Are there any other modifications I should have done to make around 400-425. All help appreciated. Thanks

 

[NCovey]

AMcKee, I have pretty much the same mods as you, except I have a Pier's cam, & ATS manifold. I am running HTT's HTB2 64/14. It is a pretty nice turbo, lights great, it lights at about 10psi, and goes straight to the wastegate, at 45psi. It will get a little toasty towing, unless you keep it in the 2000+ rpm range. When playing with it on the street, I can bury the pyro pretty quick, even with water injection. I am thinking of upgrading my 370's to an injector that has a better pattern, and upgrading the 64/14 to a 66/26(66/71/16). -Nicholas

Also on the last dyno run, I put 464/996 with my fuel screwing up and dropping off at 2400 RPM

 

[AMcKee]

Thanks, that is what i was leaning towards.

 

[Jim Fulmer]

SPS 62, I've got a truck running around with one and it works great for his application much better than a SPS 66 or a Silver Bullet as he Tow's up to 26K.



This particular truck did 496 with a stock turbo and water/meth but I don't have current numbers for it.



Jim

 

[Ahopper]

how much can the stock turbos produce normally? 350hp? i want to get a new turbo but im afraid of blowing the head gasket. and i know i would have to get studs. but how many people are running a bigger turbo without studs?

 

[Forrest Nearing]

I think w/ the 370's and only 3,000rpm, you'd be better off w/ the 65mm turbine wheel (phat shaft 62 or HTB2/14)



I love my sps62, and I've run it w/ stock injectors w/ great results, but that was with a ported head. You are at low altitude, so it'd work well, but I use my truck for work and sometimes wonder how a smaller wheel or housing would act

 

[MMcCallie]

I've been told that stock head bolts properly retorqued should hold to near 55 psi. If you keep your timing under 18 degrees at your low elevation you should be safe.

 

[Forrest Nearing]

stock head bolts are TTY... I wouldn't trust them to 55psi personaly.