turbo boost control

[mudgrip4]

Am aware this subject has been covered in part before - somewhere - but would like some advice re in-truck turbo boost control. Is it possible to have an adjustable boost apparatus in the truck - which would allow turbo to run on standard boost most of the time, but when you hit a button can give say up to 16-17 lbs for a short needed burst? And if so how is this fitted?

My last truck ran 12lbs in its tuned state without tweaking the turbo. Will tune new 2.8 to same specs but am possibly interested in turbo boost controller also - for use in occasional very short bursts only. Read somewhere these motors can sustain boost up to 17lbs?

Comments welcome.

Mike

Any

[geeves]

Mines been running 14 for many years.
I have trouble understanding the need to turn down boost once set. You only get full boost at high throttle settings Mine is only boosting 5psi cruising at 100kph but foot down gives instant 14 and everything else that goes with it.
How you take the pressure makes a big difference. My setup is as the instructions in the box sugested which has a t piece in the line from the intercooler to the pump with a restricter in the line to the gauge. I had an issue with a loss of boost which turned out to be a split in this hose(no loss of boost just a loss of guage reading)and while diagnosing this connected the guage directly to the intercooler leaving off the pipe to the pump. Result was a healthy 17 but an unreadable guage at idle. Ive never adjusted my boost but also Ive done no maintenance on the turbo and waste gate which could be stuck.
Have you got a new truck now?

[andy]

There are many devices out there for boost control from external wastegates to bleed valve and electronic boost controllers. Most of these products are designed for turbo petrol engines but diesels are still the same fundamentally.

Here's an incabin boost tap
www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Performance/Turbos/auction-145590366.htm

An incabin boost tap with high/low setting
www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Performance/Turbos/auction-145078666.htm

An electronic boost controller with built in turbo timer
www.trademe.co.nz/Trade-Me-Motors/Car-parts-accessories/Performance/Electronics/auction-145325987.htm

As you can see the options are numerous but all are based around the same idea of confusing the wastgate into opening later by bleeding a small amount of pressure out of the line to the wastegate.

[dasnoboarder]

May be wrong, but don't you tune fuel and boost together?

So turning boost up or down from that set level, in a mechanical fuel pump diesel, would cause the engine to run rich or lean?

My 2 cents :-) . Andy.

[geeves]

Diesels always run lean except at full throttle. Also there is a boost compensator in the top of the fuel pump that adjusts fuel to match the boost. If you loose the line to the compensator all that happens is a small power loss as the pump doesnt know it can sqirt the required fuel.
petrols need a closely regulated mixture diesels require at least enough air to burn the diesel More does no harm

[mudgrip4]

Interesting - spoke to a turbo specialist today and he said you can buy the simple in-cab adjustable boost control unit from repco and it is v easy to fit - 30 mins. This might equate to the first option listed by Andy above. I think I will do the basic tuning first and measure boost at that point before fitting unit - may in fact not need it. Turbo expert said bigbore and extra fuel etc automatically increases boost - and I suspect now my old truck was running quite a bit more than 12lbs.

Answer to your question Alan is am still looking for new truck. Have checked a few but want an 87-92 2.8 manual with very straight body, good ks and mechanically sound - but - they are harder to find now. A few swbs around but not the lwbs down here - a popular truck and whereas you could buy a good one 1-2 years ago for $2-2500, they now often go for up to $3-3500. The old 2.8s have a great reputation and everybody hangs onto them. If anyone knows of a good one, I'd be keen to know about it.

Mike

[geeves]

you could have mine for 3.5k but it has 20000km and a few wrinkles. The carpt would be included but rolled up in the boot.
Truth is they are now worth more to keep than sell. Ill keep mine anouther couple over years and hopefully be able to upgrade then.
For what you want to do have you considered a king cab style rodeo ute with the same engine and a camper lift off body for the back?

[mudgrip4]

I think you'd be up for quite a few k for a rodeo ute - $10k plus? - whereas these 2.8 bighorns are very good value for the dollar if you find a good one, and plenty of spare parts available. JamesW and I thinking of buying a wreck to use as a parts supply- makes that ongoing maintenance very cheap.

What would you upgrade to? The only other trucks I quite like are the safari turbo but the lwb is far too heavy to be good off road, and the lwb prado which is fine offroad but several clubmates have had cracked head problems which cost $3k+ to fix.

[Jimmu]

Why would you want to turn the boost up and down? Once the pump is matched to the boost what is the point? Boost does not make more power unless there is fuel there that needs more air to be burnt.

If you run with lower boost that what the pump is tuned to you will just run rich at throttle and churn out unburnt diesel if you run higher boost then you will run lean and make no more power.

The boost compensator from my playing with it is more of a boost on boost off system rather than a mechanism for adjusting fuel to scale with boost with any sort of accuracy.

Jimmy

[geeves]

Belive it or not Im on the look out for a Toyota Blizard/Diahatsu Rugger. No money at the moment so not looking that hard. The toyota has that famous 2lt motor but if the bighorn falls over a bank Im sure my current motor and box will fit.
In the last year the bighorn has only been used for non 4wd use about 4 times and I no longer need a lwb

[Bruce]

Hi Alan, funny you should be after a Blizzard, a mate had one over here (done it up) put it up for sale and a guy in America brought it, seems like they are well sort after. I had a Daihatsu F50 2.5 diesel went any where.
Cheers Bruce.

[crazydave]

We have a Diahatsu Rugger Out on the farm if you are interested. Has been used to tow fenceing trailer around the farm. Actually quite surprising where they can get. We dont use it much now. Im sure it could do with a new home.
Cheers Dave

[geeves]

road legal?

[mudgrip4]

Thanks for comments - I think you might be on the money jimmu. Just chatting to diesel mechanic friend and he also says its the fuel level to motor and free breathing air flow that automatically boosts turbo to extra psi performance - sets the levels - and just adjusting an in-cab controller will not do alot alone. So will stick to same tuning as last truck initially - ceretainly made it perform very well.

[formular]

proberbly not haha

[roga]

My 2.8 has been running 20 and up to 22 psi now for nearly a year with no ill affects