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3.1 Rebuild

Getting the best performance from your Isuzu, the in's and out's

3.1 Rebuild

Postby Powertruck95 » Wed Jun 24, 2015 7:21 am

Hey guys been ages since I have been on here have had so many problems trying to log in on my old username Powertruck31T so i have now made a new account.
I've still got my 3.1 Mu which I'm selling now. I've now got a 3.1 swb Bighorn which I've just built a new motor for. I'll be putting all my turbo setup and W2A intercooler into the Bighorn. The new motor is a 97 4JG2 which I've rebuilt from scratch, has new genuine liners and pistons, all new bearings. It has the later model head which has the 42mm valves. I've also done some minor work to the cam which has given me an extra 40 thou lift on the exhaust which should help increase bottom end torque even more. I dynoed my Mu just before i started the rebuild so i have a baseline figure of what it was doing so when the new motor is done and run in I'll re-dyno it again.
Just trying to figure out how to down size the files so i can attach them can anyone help?
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Re: 3.1 Rebuild

Postby geeves » Wed Jun 24, 2015 2:56 pm

Ive just sent a reactivation for 31t Hopefully you are still a snail at extra. There are 5 other powertrucks as well. Do you want me to reactivate all of them?
Best tool Ive used for shrinking pictures is Irfanview. Its free easy to use and google will take you straight to it
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 3.1 Rebuild

Postby Powertruck31T » Wed Jun 24, 2015 3:09 pm

Hi Geeves thanks for that I've had so many problems logging in on the old account I decided to start another one. Don't worry about activating the other ones. Will try and downsize these photos so I can load them up.
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Re: 3.1 Rebuild

Postby Powertruck31T » Wed Jun 24, 2015 3:37 pm

Just a couple of photos of the rebuild
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Re: 3.1 Rebuild

Postby Powertruck31T » Wed Jun 24, 2015 3:43 pm

pics
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Re: 3.1 Rebuild

Postby Hamdog » Wed Jun 24, 2015 4:58 pm

so jealous !! it looks so nice and clean ! how much you reckon its cost you to do and how long has it taken?
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Re: 3.1 Rebuild

Postby Powertruck31T » Wed Jun 24, 2015 7:17 pm

The build has taken me around 12 months ive just slowly been gathering the parts have been in no big hurry. Cost wise i would say around $3500-4k that's using mostly genuine parts. Its all the small things that seem to add up injectors pump etc
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Re: 3.1 Rebuild

Postby stardog » Wed Jun 24, 2015 9:17 pm

Very nice indeed have you installed the injector pump and injectors on it as well or still need doing.
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96 wizard 3.1 pretty stock for now but have plans intercooler bulbar winch snorkel.

Re: 3.1 Rebuild

Postby Powertruck31T » Thu Jun 25, 2015 7:28 am

Pump is installed and timed just waiting on injectors should be here end of the week. Hoping to have the new motor back in early next week. Can't wait to get it going with the new cam and turbo will be interesting to see how it goes. Can only go forward I hope lol.
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Re: 3.1 Rebuild

Postby Powertruck31T » Thu Jun 25, 2015 7:36 am

New turbo setup with the upgraded billet compressor wheel. Its basically the same turbo on my old setup just with a more efficient compressor wheel
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Vehicle: 93 3.1 Mu 32" mudstars custom turbo setup, W2A intercooler, modified injector pump 2.5" exhaust system, LSD upgraded and the list goes on

Re: 3.1 Rebuild

Postby stardog » Thu Jun 25, 2015 10:44 am

Cant wait to see that installed in the bighorn that's big turbo going on it interesting to see what the dyno read out is.
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Vehicle: 94 mu was 3.1 turbo intercooled now 2.8td rodeo gear drive engine and intercooled and fuel delivery turned up 3" system from turbo 5 speed manual arb bullbar 13000 LB winch max winch snorkel HID headlights HID IPF spotlights blue led dash lights LOKKA front diff new bushes shocks all round 80 ch unden uhf sony xplode mp3 player back seats removed and storge system put in.
96 wizard 3.1 pretty stock for now but have plans intercooler bulbar winch snorkel.

Re: 3.1 Rebuild

Postby geeves » Thu Jun 25, 2015 2:46 pm

Too many reflections in the pictures.
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 3.1 Rebuild

Postby Powertruck31T » Thu Jun 25, 2015 3:18 pm

Photos probably make it look bigger than what it is :P. It was on full boost 15psi on my old motor by 1600rpm held a flat boost curve right out to redline. May need to upgrade the pump next to a 12mm head will wait and see how it goes.
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Vehicle: 93 3.1 Mu 32" mudstars custom turbo setup, W2A intercooler, modified injector pump 2.5" exhaust system, LSD upgraded and the list goes on

Re: 3.1 Rebuild

Postby Downhillnz » Sat Jun 27, 2015 5:10 am

What are the sizings on both housings? Is it hybrid or a custom build by a turbo wizard?
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Re: 3.1 Rebuild

Postby Powertruck31T » Mon Jun 29, 2015 8:01 am

It's a custom built turbo that I have done. Runs the 12R housing with a VF8 turbine wheel machined into it and a 6 blade billet compressor wheel.
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Re: 3.1 Rebuild

Postby Powertruck31T » Sat Jul 04, 2015 9:33 am

Couple more photos with turbo bolted on
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Re: 3.1 Rebuild

Postby tealz83 » Wed Nov 18, 2015 3:34 am

Great work mate. Looks fantastic.
Have you had it back on the dyno after a bit of run in time?
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Fuel adjusted
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50mm Rear spring lift, adjusted front.
50mm Body lift. 50mm fuel tank lift

Re: 3.1 Rebuild

Postby Cartaoro » Tue Dec 01, 2015 8:03 am

Nice work. Like new motor
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Re: 3.1 Rebuild

Postby Powertruck95 » Thu Feb 04, 2016 7:18 pm

Hey guys been awhile since I have been on here. Well I have put down around 8k on the new motor all is going well so far. I ran it on the dyno a few weeks ago to get a comparison to my old setup and its currently making 101kw at the wheels with 455nm on 14psi. EGT's are still very safe 580deg pre turbine. What was interesting to see was torque was up all round and seems to hold it out much longer. We ran a AFR up the back to see how the mixture was looking and it will dip into the 15's momentarily off boost but as soon as boost picks up its running around 22-23 AFR ratios which is pretty safe. I have noticed that the fuel pump seems to be struggling to keep enough fuel up as the AFR leans off even more with RPM. I have just had a 12mm pump built using a Toyota 14B head and 4jb1 camplate so we are going to have another play. We are hoping that the bigger head with the more aggressive cam lobe is going to increase the rate of injection which will introduce more fuel quicker which im hoping will help spool the turbo even better. Time will well. So far I'm pretty happy with the setup. If I can make around 115-120kw on 17-18psi max I've achieved what I wanted to do. These engines seem to handle everything I have thrown at them so far so I have no doubt that they are strong enough.
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Powertruck95
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Country: new zealand
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Vehicle: 95 swb bighorn 3.1 manual 32 inch tyres rancho shocks all round, brand new engine with modified pump and w2a intwrcooler. 130hp 425nm 1900rpm

Re: 3.1 Rebuild

Postby tealz83 » Thu Feb 04, 2016 7:35 pm

Sounds good mate. Good afr up top. Sounds like with more fuel and increase in boost to match you will see the
numbers ya looking for. When you get the new pump in and tune to 20-1 or 21-1 the rwkw will climb safety
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Country: NZL
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Vehicle: 1994 SWB Bighorn. 3.1 TD
Sports air filter
18psi boost
3" exhaust from turbo
Fuel adjusted
32 11.5 r15 Maxxis BIGHORNS
50mm Rear spring lift, adjusted front.
50mm Body lift. 50mm fuel tank lift

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