4JB1 Boost Up

[ZachK-B]

A friend of mine recently intercooled and wound up the boost on his TD27 Terrano and it has made a noticeable difference in power. I have a 2.8 intercooled turbo diesel Bighorn and was thinking about winding up the boost as well. I know I will need a bigger exhaust as Im still running the factory system(i am planning a 2.5 inch system) and will probably need to wind up the diesel pump too. What sort of boost can the turbo and motor handle before I start to have troubles. I have heard of someone running 160ish hp from his but Im not sure what other mods he had done. Any help would be much appreciated

[mud_slinger]

do the exhaust from the back of the turbo wind the boost up to 15 and tweak the fuel as well. run way better on 15 psi and the exhaust makes a big diff.

[GotFlex]

i have 2.5 exhaust, intercooled and 17psi goes sweet on 35s

[sibainmud]

Drurban has a 2.5 system running 18 psi with no fuel tweaks and posted the readings from the new EGT gauge he fitted in the weekend. It is quite quick on 33's.
http://www.offroadexpress.co.nz/Forums/viewtopic.php?f=34&t=30103&start=15
Go for it.

Cheers,

[Drurban]

Drurban has a 2.5 system running 18 psi with no fuel tweaks and posted the readings from the new EGT gauge he fitted in the weekend. It is quite quick on 33's.
http://www.offroadexpress.co.nz/Forums/viewtopic.php?f=34&t=30103&start=15
Go for it.

Cheers,

As what sibainmud said I have 2.5" exhaust from turbo, wound up boost to 18psi but on the motor way I can get it up to 20, I know it can go past that.
All my reading from the EGT gauge are in in the safe range, I had not even attempted to tweke fuel or intercooled it yet. Iam running almost worn 33" Khumo KL71's on the road, and it has a bit of grunt.

Cheers.

[ZachK-B]

Thanks for that reply Drurban. I am going to get a 2.5 inch exhaust and am also planning a new set of extractors for better flow. I am also going to move the battery to the passenger side and the intake to the drivers side and put a snorkel on it, this should give me more response and hopefully help keep intake temperatures down.

[mud_slinger]

i wouldnt bother doing extractors or moving the intake, the costs and hassle is not worth it. its intercooled so that will help alot.

[rangimotors]

bought a bighorn mostly for towing a boat. Any pics of where people usually put the EGT probe? I'm thinking 2.5-2.75 exhaust a bit more boost and I think ill keep the viscous fan but add 2 electric fans to the front of the radiator and possibly add a small one to the intercooler. Any idea what sort of boost they run factory? Hopefully I'll get time to chuck in a boost gauge and EGT gauge this week

[mud_slinger]

10-12 psi factory. i run 15 psi on mine. if you do alot of open road driving a fan is not really worth it on the intercooler, i gain 2 psi more on open rd due to intercooler. the viscous fans are quite good i have never overheated with just the viscous. do the dump pipe on from the back of the turbo. if you are feeling rich get the turbo made into a hybrid mine moves alot more air than it previously did

[rangimotors]

yea my turbo makes a samll wine, prob be ok for another 50,000k's but i may look into fitting a td05 or similar maybe an ihi would be better

[Mattman]

I did an egr delete and used the hole in the exhaust manifold that provided the egr feed.

Just fitted a boost gauge and I am seeing 15psi quite a bit on a stock setup.

Matt.

[mud_slinger]

yea my turbo makes a samll wine, prob be ok for another 50,000k's but i may look into fitting a td05 or similar maybe an ihi would be better

most use the internals from a vf10. no other housings work. my turbo has a bigger front cover,compressor wheel and a larger exhaust housing

[rangimotors]

yea my turbo makes a samll wine, prob be ok for another 50,000k's but i may look into fitting a td05 or similar maybe an ihi would be better

most use the internals from a vf10. no other housings work. my turbo has a bigger front cover,compressor wheel and a larger exhaust housing

why do no other housings work? Because of a strange flange setup or something? I'm not expecting it to bolt up but it cant be that hard to modify the manifold or even build a new one to bolt up a standard t3 or t4 flange etc?