Nitrous, Super Chargers, & Turbos All charged talk about going FAST.

Turbocharding CPI engine?

  #1  
Old 07-25-2013, 03:29 PM
rockbuggy4x4's Avatar
Beginning Member
Thread Starter
Join Date: Feb 2013
Location: Hazleton, PA
Posts: 41
rockbuggy4x4 is on a distinguished road
Default Turbocharding CPI engine?

Like the title says. I got a 95 GMC Jimmy with the CPI engine and since I'm rebuilding my Cummins, I'll have an extra turbo. I know, I know, there's lots of threads about turbocharging the 4.3 but I can't find any (with good info) with the CPI. It's going to be an off road truck so no emissions. With that being said, has anyone done this? Does anyone have input/suggestions? Has anyone come across threads with info on turbocharging a 4.3L CPI engine?

Thanks in advance.
 
  #2  
Old 07-26-2013, 12:56 PM
rockbuggy4x4's Avatar
Beginning Member
Thread Starter
Join Date: Feb 2013
Location: Hazleton, PA
Posts: 41
rockbuggy4x4 is on a distinguished road
Default

Bump!! Anybody got any info?
 
  #3  
Old 08-09-2013, 08:25 AM
AndrewO1991's Avatar
Senior Member
Join Date: Jan 2011
Location: Auburn, Ga
Posts: 546
AndrewO1991 is on a distinguished road
Default

i've thought about this before with mine. Could imagine it would be fairly straight forward. Engine internals arnt capable of supporting forced induction from the factory, 9psi is pushing it. ECU tune would be a must. If you beef up the bottom end and do a low compression build you could boost the crap out of it. My only thought is that I think the 95 had a plastic upper intake? idk if it can take the pressure or not compared to the cast ones used in 92-94

Another thought, you know how much crap on these trucks is vacuum actuated? What does forced induction do to vacuum again? Just keep that in mind
 
  #4  
Old 08-09-2013, 08:48 AM
chris015's Avatar
BF Veteran
Join Date: Apr 2009
Location: South Carolina
Posts: 3,748
chris015 has a spectacular aura aboutchris015 has a spectacular aura aboutchris015 has a spectacular aura about
Default

hard part is fuel control. I dont think The regulators can be adjusted well enough to compensate.
 
  #5  
Old 08-09-2013, 12:47 PM
rockbuggy4x4's Avatar
Beginning Member
Thread Starter
Join Date: Feb 2013
Location: Hazleton, PA
Posts: 41
rockbuggy4x4 is on a distinguished road
Default

Mine has the aluminum upper intake. The big, funny looking one with the spider injector. I've read other threads were the intakes you're talking about can hold at most 14 psi (not recommended though). You would still have vacum to a degree since you'll still be using the throttle plate. As for fuel, i've heard the regulator for the spider injectors like on mine, are controlled by manifold air pressure. Not sure if that's true or not, but there are also aftermarket regulators controlled by the boost for the turbo.
 
  #6  
Old 08-09-2013, 09:35 PM
Thogert's Avatar
BF Veteran
Join Date: Nov 2010
Location: Northern Utah
Posts: 4,314
Thogert has a spectacular aura aboutThogert has a spectacular aura aboutThogert has a spectacular aura about
Default

When I replaced my fuel pressure reg. on my 95 it was just a spring valve, so something different would be required. I'd also wonder if the spider can be upgraded to flow more fuel or if you are limited to the stock spider, which I'm sure would struggle.
 
  #7  
Old 08-10-2013, 08:06 AM
rockbuggy4x4's Avatar
Beginning Member
Thread Starter
Join Date: Feb 2013
Location: Hazleton, PA
Posts: 41
rockbuggy4x4 is on a distinguished road
Default

Yea, that's a good question. I'll just have to keep looking around and hopefully more people chime in with ideas/solutions.
 
  #8  
Old 08-10-2013, 09:48 AM
Super Member
Join Date: Jan 2013
Location: KW Ontario
Posts: 1,110
rexazz2 will become famous soon enough
Default

what about the size of the Cummins Turbo
Thinking that's its just to big to be able to work well
 
  #9  
Old 08-10-2013, 11:22 AM
rockbuggy4x4's Avatar
Beginning Member
Thread Starter
Join Date: Feb 2013
Location: Hazleton, PA
Posts: 41
rockbuggy4x4 is on a distinguished road
Default

I would think it would work. The cummins is a 6 cylinder as is the 4.3 and it's a 57 inducer (pretty sure) with a 21 exhaust turbine. on my stock cummins, it's a bit laggy and pretty sure it supports up to around 250-300hp. I would just have to regulate the boost.
 
  #10  
Old 08-13-2013, 09:57 AM
AndrewO1991's Avatar
Senior Member
Join Date: Jan 2011
Location: Auburn, Ga
Posts: 546
AndrewO1991 is on a distinguished road
Default

there aren't any 92-95 spider injector upgrades. I've looked, the only thing you can do to upgrade them is a custom fuel rail system. One problem i see is the regulator is controlled my manifold pressure (not the map sensor). When under vacuum fuel pressure goes down, closer to atmosperic pressure the pressure rises. I wonder if it would increase more with greater than atmosperic pressure? that would be interesting, lol
 

Thread Tools
Search this Thread
Quick Reply: Turbocharding CPI engine?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.