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Unread 08-26-2012, 02:05 PM   #1
turboyj
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YJ 2.5L Turbocharged

This is my 95 yj 2.5l with a custom volvo turbocharger fitted on it. I run about 7psi on average and sometimes when im wheeling ill run 10psi for briefs periods. Engines got 170k on it and still running strong. This was basically my effort to bridge the gap between a v8 engine swap and a low buck power adder. Ive only put 400 bucks into it and most of that was the wideband air fuel ratio monitor setup. If anyones unhappy with their 4cyl power and thinks this may be the option for you, i can explain all the details.

forumrunner_20120826_145800.jpg   forumrunner_20120826_145859.jpg   forumrunner_20120826_145943.jpg  
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Unread 08-26-2012, 07:51 PM   #2
bridger04
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Nice work. Well done on a budget...ive been wanting my cousin to try this mod but he's telling me his 2.5 isnt multi port....what hear would he have then? '89? Im not too familiar with the 2.5
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Unread 08-27-2012, 05:47 AM   #3
turboyj
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Thanks man. Yeah i believe 89 wranglers had a throttle body injection 2.5 and a carbed 6cyl engine. But ultimately i dont believe that would effect his turbocharger mod because all hed have to do is bump up the fuel pressure a lil. I still run stock injectors and just added about 15 psi to the base fuel pressure. Stock fuel pump also
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Unread 08-27-2012, 11:20 AM   #4
91BoD
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What are you running for fuel management?
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Unread 08-27-2012, 02:55 PM   #5
ratmonkey
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This IS a tech section, put the tech in no matter what anyone else says.
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'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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Unread 08-27-2012, 03:17 PM   #6
caoboy
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No intercooler?

Please, details.
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Unread 08-27-2012, 08:01 PM   #7
turboyj
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Down with the details -

turbocharger from a 95 volvo 850 wagon - td04hl-15g
Homemade turbo mount off of the ac bracket
Innovative wideband o2 sensor kit with datalogging
Ebay Blow off valve
Aeromotive fuel regulator with boost reference~ set at 58 base pressure
One step colder autolite spark plugs
stock fuel injectors (tried 30lb ones but were too rich)
I use a choke cable attached to the wastegate to vary my boost pressure on road or offroad. I run about 5psi on road and up to 10 offroad
All the exhaust tubing is old volvo exhaust cut and clocked in order for the bends i needed, then wrapped in heat wrap or whatever

Thats pretty much it, i didnt eff with timing whatsoever. I run ethanol through it and i dont notice any detonation at all. Even without an intercooler to cool intake charge. I contemplated installing one but it runs fine without so... Any other questions? I could upload youtube videos if interested
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Unread 08-27-2012, 08:07 PM   #8
turboyj
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Fuel management is pretty much monitor my afr gauge and too lean ill bump up my base fuel pressure a few psi or too rich visa versa. Its not the smoothest transition in the powerband, its basically when i crack the throttle and my fpr senses no vaccuum it bumps up pressure and compenates for the boost im adding. Its tuned really well for about 5psi which is very noticable but when i get to 8 or 10psi it runs really hard in 4low but is on the lean side
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Unread 08-27-2012, 09:35 PM   #9
91BoD
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What you are reffering to is an FMU and is a good low dollar solution for fuel management, as you said it is not ideal and causes flat spots. Sounds like it is working well though congats.
I'd love to see the wide band data log on a dino or 0-60
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Unread 08-28-2012, 05:48 AM   #10
turboyj
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Yes i guess thatd be right. Technically its not an FMU, its just my fuel pressure regulator that has boost reference. Every one pound of boost equals one more psi of fuel pressure. 1 to 1 ratio. But i guess both are the same principal, except most FMUs are set and no adjustments can be made. And usually they are ratios like 1psi boost equals 8psi fuel pressure or greater. Just saying, i looked into them orginally
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Unread 08-28-2012, 08:40 AM   #11
caoboy
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How did you reroute your exhaust to the housing? just made a different manifold? I can't tell from the pictures. Looks like you routed it around the oil pain and up, but how does it exit after that? Does it just dump out of the engine bay?
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Unread 08-28-2012, 10:39 AM   #12
91BoD
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Yeah, same basic principle. What's your AFR in boost and what rpm does it spool?
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Unread 08-28-2012, 11:12 AM   #13
turboyj
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The exhaust is ran from the stock manifold, under and across the oil pan then up to the bracket. Then after the turbo it goes straight down and back to hook up with my stock exhaust on the passenger side. Ill try to show in this picture if it uploads(damn mobile app). Also my afr at full boost is right at 12.2:1.

I also included pics of my front winch bumper that i built a while back and my latest project, some homemade highline fenders

forumrunner_20120828_120914.jpg
forumrunner_20120828_120518.jpg   forumrunner_20120828_120611.jpg   forumrunner_20120828_120731.jpg   forumrunner_20120828_121039.jpg  
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Unread 08-28-2012, 01:59 PM   #14
caoboy
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Where'd you oil feed/return lines for the turbine?

Are you running Ethanol full time? You didn't change any lines/seals for E85 (assuming that's the ethanol you're running)
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Unread 08-28-2012, 02:22 PM   #15
turboyj
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Oil feed is just a tee into the oil sending unit and i ran the return line into the front of the timing chain cover.
No i didnt mean E85 i just meant ethanol mix, here in iowa its like 89 octane, the cheapest gas u can buy, other than e85 obviously.
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