new turbo and intercooler

7/31/2019 New Turbo and Intercooler

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Forum Home > OKA Maintenance > New Turbo and intercooler

Ewart & Vivian HalfordMember

Posts: 117

It has been six or seven months sinceI looked at a power upgrade.I have finally had it done. Same as Brenden. I haven't had it dynoed yet but

can notice the extra power down low, I can't see any diferance at high revs,no extra top speed. I live in Bunbury WA and can travel up the Collie hill and

hold 7KPH faster than i could. On the beach it is so much better and can run

with higher tyre pressure, also high range. I managed to conquer a sand

dune that has beaten me before, it appears to have more low down grunt. I

must admit the sand has a bit more moisture in it now from when I played

last time but it is early stages yet and i can notice the difference. I haven't got

the bill yet, not a cheap exercise.

Ewart

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May 18, 2010 at 9:17 PM
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Posts: 117

I meant to mention thatI heard that all the engines that arrived at the OKAfacory were Dyno'd and not many came up to spec but the best ones were

put in the coaches and the less powered ones were put in the cab chassis.

Ewart

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May 18, 2010 at 9:22 PM

Hal HarveySite Owner

Posts: 503

Got the bill yet Ewart? I'm going to get mine pulled apart next week to see

what shape the turbo is in (220K km)... then I have to decide whether to do

the intercooler thing too.Did you get a water-to-air intercooler? Brand? I see Brendan Eblen also put

on a larger Garrett turbo.

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Hal

May 21, 2010 at 8:58 PM
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Posts: 117

Hal,I had a lot of work done so the bill is huge but it looks like he spent 16hours to fit the new turbo and intercooler, he also had to get a few extra parts

as he plumbed it a bit different to Brenden's. It is the same turbo and

intercooler as Brenden ( air to air).

If he did it again it would be easier for him. He is very thorough.

I will be out of touch for a few days but hope to get it on the dyno in a week

or so and may be try and work out what the turbo /intercooler cost me.Ewart

May 23, 2010 at 9:17 PM

Hal HarveySite Owner

Posts: 503

I've started collecting up intercooler info in the hope of being better informed,

but it looks like everybody does it differently! Peter Furlong's and Tim

Forsyth's are in the Mods & Repairs section here.

There's also a good overview article at ExplorOz.

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Hal

May 25, 2010 at 10:57 PM
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Posts: 117

Pick the OKA up tomorrow and have it booked in for a dyno in the arvo so

should be able to post the results soon.

May 26, 2010 at 9:12 PM


Posts: 117

WellI got the oka back and had it dynoed. the torque is up by about 5% andHP is down by 5%. the fuel to air ratio went up to 30, my mechanic talked to

the turbo guys and they said that it is impossible. I took it back to the

mechanic and he chacked a few things and all was ok. They think the

reading is wrong. He cranked the fuel up to 15psi boost and it has a heap of

down low torque (seat of pants) no diferance up top, 115 kpr max. Went up

Collie hill at 70 kpr thats 6 kays faster.(12Ks all up)may get another dyno inperth latter. It has cost me around 6K

June 1, 2010 at 9:20 PM
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