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Old 09-05-2020, 02:38   #1
zestyfesty
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Join Date: Jul 2013
Posts: 146
Engine rebuild complete

Hi All,

An engine rebuild is a big deal and a big cost, so I thought I would share the results for those of you contemplating, and seeking data. I certainly trawled plenty of posts here to gather info. Hopefully this might add to that pool of info.

Tear down revealed a buggered thrust bearing, crank walk and a spun main bearing. Engine was running seemingly well despite this, but some comp numbers were off. Relieved to have actioned the job when I did! Block salvaged.

Engine in its previous state:

98 octane
S1 cams
Forged pistons/rods
Tune
Factory TDO5 9.8/16G

- producing 220awkw when it was fresh, closer to 200 in recent times. The fast spooling and excellent response characteristics of this turbo was spot on for my applications (hillclimbing/tarmac rally/autocross), but I was hoping for a more willing top end in the new spec.

Main new bits:

CP pistons
Manley rods
ACL bearings throughout (incl. a different design thrust/main bearing)
ARP studs
VIII MR crank
Head - got the standard refresh; synchro valve seats etc new retainers/springs Turbo - MHI 18G (FP18) which doesn't appear to be very popular here in Oz (it's not big enough? Dunno)
E85 (plus bigger pump/1000cc injectors)

The turbo decision we agonised over for weeks; studied dyno curves and peak numbers, response etc from a large number of builds undertaken by my workshop. In the end we plumped for the the low key MHI/FP18, which I'd never even heard of until recently, never mentioned general Sunday morning cruise chatter, and I've never seen one bolted to an Evo at a motorsport event.

I'm a bit OEM-inclined in general, so it was pleasing for me to know its the product of FP and the people who designed and built the 4G63.

This turbo is an absolute gem of a thing. Boost builds as quickly as the old setup (3,500rpm) but by 3800 there's 200awkw (almost as much power as the old setup at 6000rpm!) The 3500-5500 window is rampant and silly and I bloody love it. It will also hold near max power 6-7800 if needed. It feels really muscular, even with 2.0L. I think it should translate effectively to hillclimbing/tarmac rallying applications.

I haven't had much quality time with it yet due to coronavirus restrictions on movement, but I cannot wait to get the new setup into an event when a new normal resumes hopefully later in the year. Details attached. Final tune trimmed a few ponies from top end.

I hope this may be of use!

Cheers,
Jim
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Cars: Evo VI GSR, Subaru BRZ PP, Toyota Landcruiser 80 Series

Last edited by zestyfesty; 09-05-2020 at 09:01..
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Old 09-05-2020, 09:02   #2
zestyfesty
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Now going to do my homework and re-size images! sorry
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Old 10-05-2020, 09:52   #3
zestyfesty
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Red face Dyno sheet

Resized - hopefully
Blue curve is factory boost
Red is at 23psi
Attached Images
  
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