chip it fuel rail pressure limiter

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chip it fuel rail pressure limiter

Postby dinos4x4 on Sat Sep 06, 2014 11:59 am

I have just picked up a 2nd hand chip dominator mk 3.1 chip and it came with the rail pressure limiter whats the advantage of this mod
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Re: chip it fuel rail pressure limiter

Postby variflex on Sat Sep 06, 2014 5:58 pm

Basically the mod allows you to run higher tunes, equalling higher rail pressures, the standard rail limiter won't allow you to run those pressures and you need that limiter, I wouldn't recommend running it as they have be known to leak, a quick search and you'll find a lot of info, the standard limiter will allow you to run substantial tunes,
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Re: chip it fuel rail pressure limiter

Postby Kegsy on Sat Sep 06, 2014 6:20 pm

The up spec limiter won't leak as its a recalibrated genuine unit.

The billet blanks are the ones that leak.

My up spec limiter has run without issue
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Re: chip it fuel rail pressure limiter

Postby dan.batto on Sun Sep 07, 2014 10:23 am

As Kegsy said,
I'm currently waiting on a run of the up spec limiters to be done as my billet started to leak after about 12 months or so.
With factory one I constantly get codes and it goes into limp mode when I boot it with the chip plugged in. So have unplugged the chip til I can get my hands on one ;)
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Re: chip it fuel rail pressure limiter

Postby dinos4x4 on Sun Sep 07, 2014 8:50 pm

i think my chipit dominator mk3 is only on tune 4 my triton has 2.5 straight htrough , snorkel and unifilter.

I seen some of there tunes quote 500km of torque what tune would that be i have the usb thumbdrive with the tunes on it .
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Re: chip it fuel rail pressure limiter

Postby Greytriton on Sun Oct 19, 2014 12:31 pm

I modified my standard valve. Drilled and tapped the inside galary and installed a grub screw
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Re: chip it fuel rail pressure limiter

Postby Cowboy Dave on Sun Oct 19, 2014 1:15 pm

Greytriton wrote:I modified my standard valve. Drilled and tapped the inside galary and installed a grub screw



Any more details? I'm having trouble picturing what you mean.
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Re: chip it fuel rail pressure limiter

Postby Greytriton on Mon Oct 20, 2014 5:23 pm

- Removed the relief valve from the fuel rail.
- In the banjo end of the relief valve there is an existing internal hole around 4mm.
- Tap a thread in this hole to 5mm
- Thoroughly clean out the valve to make sure no metal swarf is in there.
- Loctite a 5mm grub screw into the hole

This effectively blanks off the valve allowing me to use higher tunes with no faults etc.
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Re: chip it fuel rail pressure limiter

Postby Naff on Mon Oct 20, 2014 6:54 pm

Is that grub screw going to be rated to the pressures experienced in the limiter?
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Re: chip it fuel rail pressure limiter

Postby Greytriton on Tue Oct 21, 2014 6:00 pm

Been in for months no issues.

It's captive anyway inside the fitting.

No less strength than the relief valve body itself.
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Re: chip it fuel rail pressure limiter

Postby Cowboy Dave on Tue Oct 21, 2014 7:42 pm

Good stuff mate, it's always great to see a bit of ingenuity brought to these things, without it there'd be nothing new out there. Thanks for sharing the idea. For my part I'm looking forward to whatever you come up with next. :geek: :D
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Re: chip it fuel rail pressure limiter

Postby Tony on Tue Oct 21, 2014 9:41 pm

Is a top idea if executed the correct way. Believe it of not, Chip-it visited this idea and also fitting a solid bolt in place of the banjo bolt. The latter ended badly. :roll: :lol:

I recall Justin saying some threads leaked on the grub screw idea so they went to the disc as seemed a cheap and easy fix at the time.

Over time, the alloy disc had issues so they moved to a steel item which some still had installation issues and leaked. During this period of time, I made a lot of noise about the idea of developing a higher pressure limiter valve to safe guard our fuel systems.

As the OEM item where scarce in those days, a number of units were manufactured locally with a stronger spring fitted. These items all worked very well, but were hideously expensive so moved off shore. This was when what's known as the "billet limiter" appeared and essentially was total brick as a disc or the above grub screw idea is.

The first few hundred billet limiters were exact same in dimension to OEM items and had no issues to speak off. However, over time it was noted the seat area was slightly decreased and the finish was not very satisfactory therefore making a mess of the internal washer inside the rail where the limiter seats.

In more resent times, some of the returned (failed) OEM limiters where refurbished to hi-spec where they can be dissembled (with care) and either a higher tension spring is fitted, or some I have done here had the OEM spring heat treated.

On factory limiters, nothing will stuff them quicker than leaving a rail pressure type chip enabled whilst the MUT3 ramps fuel pressure up checking for leaks. ;)


I think Greytriton's grub screw idea done properly is certainly a better alternative to using the billet limiter (As OEM part goes back in) providing the thread does not leak down the pressure. 8-)

We will manufacturer some OEM limiters as hi-spec in coming future as an alternative to the full brick.
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Re: chip it fuel rail pressure limiter

Postby Kingbrown on Thu Jan 29, 2015 5:03 pm

Tony,

You mention the factory limiter being stuffed when MUT3 ramps rail pressure to check for leaks (with a rail chip in place), so would a hi-spec limiter suffer the same fate ?

In other words, should the chip be removed whenever MUT work is going on ?
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Re: chip it fuel rail pressure limiter

Postby Tony on Thu Jan 29, 2015 5:51 pm

Yes, best remove or set chip to factory tune as MUT has no idea of actual fuel pressure.

The Hi-spec will tolerate it longer, however I have seen one fail. :lol:
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Re: chip it fuel rail pressure limiter

Postby coughy on Thu Jan 29, 2015 8:09 pm

so would one of these rail limiters be of any benefit to a stock engine??
im getting a 3" exhaust and a remapped ecu this year so would one of these help? before the tune or after?
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Re: chip it fuel rail pressure limiter

Postby Tony on Thu Jan 29, 2015 8:27 pm

Normally no benefit unless the factory limiter is already leaking off.
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Re: chip it fuel rail pressure limiter

Postby variflex on Fri Jan 30, 2015 7:09 pm

I have been wondering about the fuel rail pressure limiter for a while now thinking I may need to mod mine,

When I nail the throttle and revs hit approx 4500 I have the sensation similar to a rev limiter cutting in,
Now I'm confident the rev limiter is not set to 4500 and wondering if it my be excess fuel rail pressure bleeding past the rail limiter,

I am running the chipit chip on tune 4, boost has been increased a little with a manual boost control.

Given I have the chip I tend to think the rail pressure may be exceeding the limiters spring setting

Any thoughts folks?
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Re: chip it fuel rail pressure limiter

Postby Cowboy Dave on Fri Jan 30, 2015 7:33 pm

Sounds right. From what I've heard, once they let go once, they let go more easily thereafter.
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Re: chip it fuel rail pressure limiter

Postby coughy on Fri Jan 30, 2015 7:59 pm

so can it be tested as to what pressure it is letting go?? or is that a secret mitsubishi business??
because im only just getting to 20,000 psi and the car seems to be dead up top and has a hesataion during the revs every now and then.
or do you think the scv is starting to go.
ive done the pull it out and clean it/ polish it
but still playing up
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Re: chip it fuel rail pressure limiter

Postby Tony on Wed Feb 04, 2015 11:04 pm

The limiter valve is not easy to test as such, but should they bug out, you will notice the fuel pressure ramping up towards 20,000odd PSI then suddenly dropping back while the engine is under load.

Here is a factory item (This one bugged out well below 20,000psi) with internals removed and ready to be refurbished to Hi-spec.

IMG_20150204_233540.jpg



These come apart very easily, but care must be taken as to prevent personal injury or losing any parts!!! Wrap it in a rag if punching the seat out.

Reassembly requires holding the seat back in place against the spring tension and crimping the seat in position. Again, care should be taken as to prevent injury, loosing parts or damaging the limiter.
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Re: chip it fuel rail pressure limiter

Postby variflex on Thu Feb 05, 2015 6:57 am

Do you have any hi spec limiters Tony?
I would be keen to snap one up if you do
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Re: chip it fuel rail pressure limiter

Postby Kegsy on Thu Feb 05, 2015 8:07 am

Tony wrote:The limiter valve is not easy to test as such, but should they bug out, you will notice the fuel pressure ramping up towards 20,000odd PSI then suddenly dropping back while the engine is under load.

Here is a factory item (This one bugged out well below 20,000psi) with internals removed and ready to be refurbished to Hi-spec.

IMG_20150204_233540.jpg



These come apart very easily, but care must be taken as to prevent personal injury or losing any parts!!! Wrap it in a rag if punching the seat out.

Reassembly requires holding the seat back in place against the spring tension and crimping the seat in position. Again, care should be taken as to prevent injury, loosing parts or damaging the limiter.


Tony,

Send me your address, I've got a factory limiter here out of my old truck I can post to you.
Might be handy for a re-cal, probably hard to get a hold of I imagine?

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Re: chip it fuel rail pressure limiter

Postby dan.batto on Thu Feb 05, 2015 9:57 am

variflex wrote:Do you have any hi spec limiters Tony?
I would be keen to snap one up if you do

Ive been chasing one for a while (6+ months), Tony has been quite busy and unable fit making them in at the moment. Im hoping soon, as my stock one is bugging out constantly.
It will require return of your old one ;)
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Re: chip it fuel rail pressure limiter

Postby variflex on Thu Feb 05, 2015 11:51 am

dan.batto wrote:
variflex wrote:Do you have any hi spec limiters Tony?
I would be keen to snap one up if you do

Ive been chasing one for a while (6+ months), Tony has been quite busy and unable fit making them in at the moment. Im hoping soon, as my stock one is bugging out constantly.
It will require return of your old one ;)


Thanks Champ.

i have flicked Tony an email this morning,
More than happy to send back the old one
Fortunately mine is not too bad, only when I really give her a bootfull does she pop
Last edited by variflex on Fri Feb 06, 2015 7:33 am, edited 1 time in total.
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Re: chip it fuel rail pressure limiter

Postby coughy on Thu Feb 05, 2015 7:56 pm

th tony a wealth of knowledge as per usual mate..
i will look at what my rail pressure is doing next time i drive it ..
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