OVERBOOST - What boost wast it at?

[amalinze]

I just think i went overboost. the engine check light came on and the car went into limp mode. stopped the engine and then started again, no probs but the engine light still on. i'm about to disconnect the battery to see if it will clear. BUT it came on at 19.9 PSI. isn't that a bit low? Anyone else had this problem and at what PSI?

[ML-VR08]

Yeah mate, i had it at around 19psi.

[amalinze]

Thanks for that, i cleared my engine light, now i'd better lower the boost! Good to know mines not set low or anything. Now i need something so i can boost it a bit more. another 3 psi would be nice.

[rick]

monster recons 23 is a safe figure

[amalinze]

cant get it to 23 with out the engine light coming on and the car going into limp mode.

[MonsterTriton]

23psi is fine, but you will need a boost cut module.
as the engine cuts just before 20psi set by the ecu parameter on the map.
i sell these items,
the DMS piggyback package includes the boost cut module.
this tricks the ecu to think you are boosting std, (14.5psi)
but infact you are overboosting (20+psi)

Hicko, is doing a group buy, if you want one you can contact him,

[Stu]

23psi is fine, but you will need a boost cut module.
as the engine cuts just before 20psi set by the ecu parameter on the map.
i sell these items,
the DMS piggyback package includes the boost cut module.
this tricks the ecu to think you are boosting std, (14.5psi)
but infact you are overboosting (20+psi)

Hicko, is doing a group buy, if you want one you can contact him,

monster, can you supply the boost cut module seperately?

[MonsterTriton]

yes we can.
they go for USD$299.
with DMS
they go for USD$220

[Stu]

c'mon you can do better than that

[MonsterTriton]

hey mate,
i sell them as a promotion set with DMS.
there would be no point to sell them with promotion price without the promotion package.
thats seems understandable i hope.

Though you should contact Garry Hicko. he will be selling them, and he can give you better price as he is bulk buying and is being sent at one time.
you can discuss the price with him.

i hope this helps mate.
but surely i can 100% garrenty that your truck will never be on limp mode from overboost, ever again!

[Stu]

how easy is the install of the boost cut?

[MonsterTriton]

very easy, there is simple 3 wires.
a yellow, red, and a black.
the black is ground ofcourse.

the map sensor, you need to cut one wire and bypass it with the boost cut module.
Connect one wire of the boost cut towards the map sensor, and the other wire goes towards the ecu.
and ground the black wire. and thats it. simple and done.
it comes with full installation manual.

it will take you about 3mintues to install boostcut.

[Stu]

warranty?

[Stu]

and does it come with instructions/pics for install?

[Homer]

Hey all, I just drove Hicko's truck and will post my thoughts on his thread 'DMS ralliart piggyback' if you're interested.

One thing I will say here that may be relevant, is that if you don't have a chip and have it tuned/dyno'd to suit, I think you will be risking running too lean and possible damage over 17psi as you may be pumping air and not enough fuel into the combustion chamber.

On the dyno Hickos truck flatlined on the air/fuel critical level at 17 psi boost with the the standard setup.
He has done the research and actual testing and has a wealth of info on the subject. Is worth a chat to him

I wouldn't overboost my turbo without the accompanying mods to make it safe and effective.

[MonsterTriton]

Homer, eactly.

When ever you are modifying the diesel,
you have to be aware of the effect of bad tuning and bad ways to modify.

now i can clearly state that increaseing boost without increase fuel,
will not give you the gains you are seeking, at the same time more importantly,
when you run lean, you can melt your pistons and create unnessary problems.
this also comes to play when you are running rich, when you are over fueled
and as we call it "squid" squirt black smoke everywhere in the whole rpm range.
running lean will very quickly increase your egt,
std egt should be anywhere between 400-650*c.
at about 850-900*c your pistons is melted.

Now diesels dont suffer from detonation like petrols,
they can take tremandous amount of boost, over 3bar (45) in our little 4cilinder trucks.
and over 5bar(75-100psi) for the american 6-8 cilinder diesels.
but at the same time,
you have to try to match the air to fuel ratio,
to balance the air to fuel ratio, you have to adjust the amount of fuel, togather with the turbo boost.
now the turbo just multiplies the atmosphereic pressure,
and the pressure ratio of the turbo togather with the compressor wheel, turbine wheel and housing spec will determine how much flow your turbo will flow.

its perfectly fine and normal to have black smoke come out in 1st gear, but if you are still generating black smoke in 3-4th gear you are running way to rich,
you are loosing alot of power,
wasting fuel,
and running your egt through the roof.

so i can 100% advise against increase to much boost without adding approriate fuel increases.
if you want to run std fuel setting do not exceed 16.5PSI.
but when you start to increase fuel, you are in the game to increase boost to match the fuel.

With Hicko's cases, when i sent the dms, i fueled it, if he ran std turbo boost, he will be genrating alot of black smoke, increase his egt, gain little power.
but as soon the black smoke emerged, i knew we had to increase the boost. so looking over my tune,
i asked hicko to up the turbo boost to 22psi. at which point, his air to fuel ratio is nearly std, which is wonderful, and which also means he gained alot of horse power, decrease fuel consumption, and is running low egts. With appropraite tunes and boost increase, you will gain all the benefits, with NONE OF THE PROBELMS OF RUNNING LEAN OR RICH.

[MonsterTriton]

but yes it comes with picture instructions,
and it has a 2yr warrenty.

[Stu]

hey homer, I realise this, I have had the tdc in for a while now and have had a few probs with what seem to be over fueling so I just picked up a boost controller, boost gauge and a unifilter which over the next week I'll install and hopefully get her running just nice but if I can wind up the boost over 20 with the tdc then I will definatley need the boost cut

[Homer]

Hey Stu, I wasn't aiming my comment at you mate.
I just wasn't sure that some people weren't buying a boost controller only and winding it up for go fast - I suppose because that was a thought that I might have had myself and I'm certainly no expert (maybe should shut up sometimes says the Mrs).

You might be on the right track with the TDC judging by some posts I've read with smoking issues - "TDC and me" is one I can remember. There's gotta be a fix for some of the problems?

Ever thought about dyno'ing the car when you get it all installed?

[Stu]

that ok mate I realised that, I will def get it dyno'd and that "tdc & me" was blue using my chip for comparison to see if it was just me or the chip having issues

[Homer]

Ahhh... I knew it was Blue, didn't remember it was yours he borrowed.

Good luck with it.