Turbo upgrade
- Paul Scherek
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- Peter Davis
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Peter
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- Supertramp
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- mort
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The reason for changing is I mounted an intercooler up front which meant 1.2mt piping to intercooler and same return however before I was getting max boost of 14 now max boost of 10 so the benifit of cooler denser air is lost by too much drop in boost and going to wastegate means you dont over boost as it can be set and in this case set at 18.
Its not too late as we need to install test in operation and make changes as required etc and when we are happy get dyno then ready to place order. I am doing this for myself and it is no extra effort to order 1 or ten and if lucky it may bring the price down so why not pass the benefit on.
when I am ready to order which could be a few weeks I will let every one know so there is still time to confirm your orders
Mort
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- Peter and Sandra OKA 374
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Being a longtime Landcruiser owner I was horrified at the boost and EGT levels when I first fitted the gauges but was reassured by a couple of Perkins engine specialists that my figures were fine, in the normal range and the engine could handle it.
OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
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- Ralley
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When I upgraded the turbo in my Cruiser I spoke to a guy (who I ended up buying a turbo from) who was very quick to inform me that heat was a higher risk rather than boost and more boost in a well matched turbo means lower EGT's. With my new turbo with the same load my EGT's are about 100deg c lower than before with about double the boost so for example I went from about 6psi towing to about 13psi this combined with about 400rpm quicker spool up and 17psi max instead of 12psi what a weapon.
Rob
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- bobrichards
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- darren lilly
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- mort
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If I was only doing for myself maybe I would stick with what I have so far but as so many have shown interest I want to get as best as possible. The issues are the 135TI turbo has a different size mounting to manifold,exhaust out to dump pipe and oil in and oil out so now we need to change the cartridge and turbine to suite the 110 existing fittings this will allow for a straight bolt on turbo with no adapters etc so now I wait till its ready then fit and test.
Martyn
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- mort
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Have patience
Martyn
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- Rick Whitworth
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mort wrote: The issues are the 135TI turbo has a different size mounting to manifold,exhaust out to dump pipe and oil in and oil
Martyn,
I have been looking at differences between 135TI and the 110 in the hope of an upgrade and came across this problem. Got too hard for me.
Are you considering intercooling?
Based on my experience with the 110 I think it would make a huge difference but the changes to the input volume and pressure need to be taken into account with the turbo specs and the injector pump settings.
You have put a lot of effort into developing a working solution. I would like to join the queue to purchase a unit when you have it sorted.
Rick
Rick Whitworth:  OKA XT 149.    Digital Twin.    Loaded 4x4.
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- fishing01
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Add me to your list as well.
Regards,
Geoff
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- mort
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Anyway all sent to the engineers who got specs for the engine and original turbo and set up a test bench,6 weeks later they have all they need to design and build a whole new turbo production starts this week with completion due by the 20th then testing and ready for shipping by 27th so I should get it by early April.
On their report back to me they did comment that the problem with the original was the compression ratio as it was very low at 1.73
The reason for the road test was to see what is the rev range in normal use and design a turbo to suit
Its taken a bit of effort and cost but I will get there in the end.
Martyn
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- Supertramp
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regards OKA 398
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- Nobby
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I have been reading your post on turbos.. My 187 has a boost gauge, and at full noise gets to 10psi. The EGT gauge is still waiting for me to repair it. It is also fitted with an intercooler, and the NP205 transfer case, and it can clip along at 110 kilos [GPS] effortlessly all day. My work vehicle [430] with a good engine and new turbo struggles to maintain 100 kilos, and would only do 110 kilos down a mine shaft with a tailwind..
Cheers,
Nobby.
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- OKABloke
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Are you getting full Throttle travel in 430?
the two places to check are :
1/. At the pedal, over time the pedal bends and will bottom out on the floor, and an easy fix as it will bend back by hand
2/. Another common place is where the throttle cable attaches to the pump, the outer case can often slide, there is a locating ring on the cable to stop it from moving and is often not clamped in it's home position.
For Sale:
XT and LT Parts and Service Manuals Available on CD. $150.00 Delivered
### OKA Manuals Now Available as a Download ###.
20mm Spring Hanger Pin Upgrade Kits.
David
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- Paul Scherek
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- Outback Jack
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Tyres Size
Heat
Getting full throttle
Terrain
Condition of engine etc.
My current OKA is good for running all day at 100 - 110 kph.
Other OKA`s I have owned where flat out doing 80 or 90.
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- Peter_n_Margaret
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What maximum EGT do people think reasonable?
#196 will cruise at 100kph with a max EGT under 500C and boost around 12+psi.
I have run it with more fuel and max ECG 550C and boost up to 17psi. It produces lots more power at that.
Cheers,
Peter
Cheers, Peter.
OKA196 tinyurl.com/OKA196xtMotorhome
Mob.0428171214
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- OKA 138
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Fuel temperature also plays a big part so keep that below 60c, I would say its unlikely our Oka / Perkins would have a problem of that nature but a fuel cooler is quite easy to make and fit if required.
Cheers Dave
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