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2.8 MU Turbo upgrade options

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2.8 MU Turbo upgrade options

Postby tonkamu » Sun Jan 21, 2018 1:55 pm

hey all, whats the common upgrade from the small factory turbo on 2.8 MU. I hear the 98 - 03 4jb1t Mu's run a bigger compressor turbo and bolts straight onto the older 4jb1t manifold.

Planning on changing oil filter housing and getting the 2.5" turbo back pipe before getting a bigger turbo.

I don't want to big, I'm after more torque and faster spool up.. anything under 1400 rpm would be nice.

Anyone have options that worked and any details would be of big help.
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Re: 2.8 MU Turbo upgrade options

Postby geeves » Sun Jan 21, 2018 2:33 pm

My old 89 bighorn still had a factory turbo (I bought the car at 92000km) but it did have snorkel unifilter and 2,5 inch exhaust. That would hit 10 pound boost by 1500 and 15 by 1800 which it would hold till 3800 only dropping to 12 when the rev limiter kicked in.
Bigger turbo would see more power at the top end but would not be great at low revs. Short of a custom turbo from the a turbo specialist you could easily be disappointed with the result. A good 2.5 inch exhaust with open muffler will see good gains across the rev range especially at low revs. Also see what you can do to make the intake breathe better. The Mu isnt to bad but the bighorns settup would seem ahsmatic to a Pug
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 2.8 MU Turbo upgrade options

Postby tonkamu » Sun Jan 21, 2018 2:40 pm

yeah mine hits 10-12 easily, getting it to 17 takes some time. My turbo is quite small, I think once you have all the other mods (intake and exhaust) a slightly bigger turbo would see good gain over the factory one. I'm not looking for a big one as the engine would struggle with it. But I heard the later 4jb1-t engines (98-03) ran slightly different set up. But its hard to find those wrecking and I've never seen one up in person.
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Re: 2.8 MU Turbo upgrade options

Postby isuzurob » Sun Jan 21, 2018 4:18 pm

Later model 4jb1 runs a smaller turbo and exhaust manifold I have a turbo if you want to buy, ideal turbo is off a 89 s spec bighorn they have a 12r exhaust housing and good flow compressor and will bolt straight on, also can run a vf10 or vf8 compressor and core in your factory exhaust housing, more fuel equals less lag but higher egt if no done right
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Re: 2.8 MU Turbo upgrade options

Postby tonkamu » Mon Jan 29, 2018 1:30 pm

Yeah after a upgrade/replacement. I'll send you a PM Rob.
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