- Posts: 54
Sorry for late reply but I have been out of action for some weeks and no there has been no more added to the 5 already on order so I will contact factory and put in a small order by the end of the week.
If any one else wants a turbo then let me know asap as these are not off the shelf and need to be made to order.
I will be completing the order for turbo's by the end of this week and I have sent the details to all that are on the list so if you dont get en email from me by today slease contact me or as not every one gets on the site if you know anyone who might want one let them know to contact me as it has been 1 year since last order and you may have to wait another year.
Martyn mob 0414632270
The order for the turbo's have gone through and production should start within the week so there is time for any late order and I will inform when shipping is ready.
- Posts: 39
Cheers Steve and Sal
WELL ... after chatting with Martyn sometime ago about this, I decided I would do some simple things to see if I could get some better efficiency out of the LT110. So, with the help of Martyn I swapped out the standard turbo with one of his and IMMEDIATELY noted a significant improvement in available power ... it felt at least 50% more powerful. Followed this with changing my muffler for a dummy one (straight through), and OMG this old girl certainly has a new lease of life! I added an EGT (post turbo) and a boost guage and I feel a whole lot more connected with my machine. The vehicle is now much more responsive and comfortable on the road (and up hills). The max boost I am getting though is only 12psi ...
So ... I thought I would take it for a dyno tune to get the professionals to optimise the new set up. Upon Martyn's recommendation I took it to Marty at United Fuel Injection who had been 'briefed' on all Oka's. After fiddling around with it for 3 hours he came back to me and said he couldn't improve on it's performance ... he showed me a graph outlining that we had 77KW (105Hp) @2356rpm and 378Nm @1600rpm. He stated that these were pretty good figures for a stock Perkins, AND he wouldn't charge me as he said that he had been unable to offer any improvements . He suggested adjusting the boost which is certainly the next little tweak I am going to do.
As you can imagine, I am pretty please with how this has turned out. A custom turbo designed for Oka, by a local (Martyn) who then came down and helped me install it, and then to have verification that all is running sweetly (at no charge) ... happy days. Highly recommend United Fuel Injection - speak with Marty there.
Love my truck,
Daktari wrote: ...
... The max boost I am getting though is only 12psi ...
Interesting. I was thinking that my 11ish psi was abnormally low.
The zorst pipe is pretty blue and I need to install the EGT.
I also have the fat bulge installed in the zorst, which is a straight through minimalist attempt at a muffler.
More boost would in theory give more power even if more fuel was not added.
I have no way to know what the power was before. I can only assume that it must have been really patience building?
Daktari wrote: Thanks Alister ... I shall have to do some digging here in this forum for discussion on the transfer case and ?subsequent loss through it. The bloody thing always weeps oil anyway and stuffs up my handbrake so would be a double bonus if I could get more power AND a working handbrake!
Betting on both is like playing red and black at the roulette table.
Alister McBride wrote: ..., not sure how much though...
The quote alone stops many in their tracks...
Daktari wrote: Thanks Holmz, yes I believe it will make a difference and am keen to tweak and see what happens. I can hear a change in tone when psi hits around 11 and am thinking it may be waste gate opening and thus ?losing boost. Saying that though I am so stoked with the extra grunt I am now getting just with the simple changes made so far. I'll report back when I get some time to adjust it up.
Let me know how you go with the adjustment... please.
It is a win/win with air, as more power and better (lower) BSfC happens with more air, and lower F:A ratios.
Then for the green crowd, the Nitrous Oxide production go down as the combustion temps go lower.
So itis a win win.
However you said that the fellow fiddled with it for three hours, so maybe there is no adjustment for boost?
If there is one, then where izzit?
Daktari wrote: Thanks Holmz, yes there is adjustment on these ones designed by Martyn but it requires taking out the drivers seat and side engine panel to get to it. There's a threaded rod that sits on the side of the turbo. Marty at United didn't know how to get in to it and so didn't explore too much (or ask me). I was thinking it was to do with inlet pressures etc on fuel side and so was interested to see if the professionals could improve on what I was getting ... now that I know it's optimised on fuel side I will tweak waste gate opening to get more boost. I'm certainly an amateur with all this but i'm loving learning more about my rig.
Back in the day, when turbos were new to me, I pit one on a small block ford.
The waste gate had an adjustable air regulator between the pressure side and the wastegate input.
So it could be adjusted from the drover's seat.
I'll look at the adjuster at some point, but I think for mine, that when I put the gauge into the hose coming from the compressor it was hitting 11 psi.
(And the hose was not connected to the waste gate mechanism.)
So I am unsure whether there is any way to go higher, unless it needs more fuel to get more Zorst-gasses to spin the turbo...
So if you disconnect the hose and shove a bolt in there a clamp, then you should get higher than 12psi if the waste gate is what is currently limiting psi...?
I haven't done it as i own an XT so already have an NP205, so others may wish to jump in here about the OKA specific changeover parts but i imagine you would need:
- brackets to mount it
- change the rear driveshaft length (i'm assuming)
- gear change cable adaptation (assuming)
- speedo sensor adaptation (i think)
Possibly other things i'm not thinking of right now... East Coast Oka Spares (Paul Knott) sells a kit and over west OKA Parts Australia i imagine would sell a kit (again assuming).
Reading the list above, it seems like it would be a big job but it's really not...
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