Adjusting the maximum fuel screw

[dave friday]

Hi folks,if i turn the max fuel in as far as it will go [it still has the anti-tamper clip on ] am i likely to get very high egt... yeah i'm asking for a guesstimate!!
Ta.

[theman53]

Read in the FAQ. There are threads how to make your car faster, depending on what you have.

Make note of what you do. If you just turn it in all the way it will probably run away on you.

[dave friday]

Thanks,I'm not going to remove the anti-tamper clip...

[92EcoDiesel Jetta]

Measure screw protrusion first so you can go back.  If you don't remove the anti tamper collar you won't get much adjustment.

[Gizmoman]

IMHO, unless you have a way to accurately monitor EGT temps, I wouldn't mess with it.
If you mess with it anyways, make sure you have extra funds and spare time.

[dave friday]

 Thanks both,so with the clip on [limiting the adjustment]am i likely to get too high egt?.
The long hills plus high winds mean that i have my foot to the floor quite often!!

[92EcoDiesel Jetta]

Thanks both,so with the clip on [limiting the adjustment]am i likely to get too high egt?.
The long hills plus high winds mean that i have my foot to the floor quite often!!

The collar on mine was crimped AND welded on and  could not be turned inwards more than 1/4 to 1/2 turn with it still on. If yours are the same then not much to worry about unless you get tons of black smoke when you romp on the throttle.

[bajacalal]

Small amounts of adjustment on these pumps can make a big difference... plus you're in a Synchro van which has to weigh at least half a ton more than the vehicle I've got the same engine in, so you're going to be hard on that engine anyway. Full throttle/full fuel up a hill is just not a good idea for any diesel engine. If you have not done so already, the first thing you need to do before turning screws is to open up the exhaust and or air intake... something where the exhaust can flow "straight through" is best and consider increasing the diameter of the pipe. This makes a huge difference, and will have the added bonus of lowering your egt... most of the heat that your engine produces is actually expelled through the exhaust, not the radiator.

[dave friday]

Thanks all,bajacalal ,i have tried running without the exhaust,seemed to have a very small increase in power!.
I do'nt have any custom exhaust/tuning companies near me[i'm in the mountains at 2500ft ].
I fitted an oil cooler plus oil temp and pressure gauges.

[745 turbogreasel]

I'd say you can't really hurt anything with the collar there, unless the screw came from another pump maybe.

that is pretty much the whole reason the collar exists.

[dave friday]

Ta all,745 i was hoping someone would say that,i'm going to fit my egt guage at some point!!

[Gizmoman]

I'd say you can't really hurt anything with the collar there, unless the screw came from another pump maybe.
that is pretty much the whole reason the collar exists.

I'm not nearly as knowledgeable about these engines as 745 turbogreasel, just want to point out that the engine is not designed to push that kind of weight/shape up long grades in high winds at WOT.
Adding fuel to make it go faster without monitoring EGT is a path that can lead to melted stuff.

I was warned by a few on this site and didn't heed - now I have a van that is parked, and a garage full of engine parts in slow re-build mode. I also never removed the lock on the fuel screw- just turned it in "a bit".
For the record, my engine is a 1.9. I also increased the boost on the K14 from 10psi max to 15psi. Maybe it's a combination of turning in the screw and adding boost that melted my #4 piston to the barrel walls, -maybe it was something else. All I can say is that had I been able to watch the EGT temps, I sill might be spending weekends camping instead of in the garage (still kinda fun though).

I really thought watching my water temp was good enough - trust me, it's not even close. Sorry for rambling and again, I am not as sharp as 745 turbogreasel, just install an EGT sensor and gauge and turn that screw all you want.

[745 turbogreasel]

Boosting above your turbos stock  range will add some heat regardless of fuel.

IMO, the EGT gauge is a great tool even on a stock vehicle.

I stuck #3 to the bore in my caddy at 2/3 gauge before I put in the turbo motor.

[dave friday]

Ta all,I'll fit the egt gauge as soon as possible.
The "jx" engine was only fitted to the T3 van [my syncro included].
My plan is to remove the turbo and drill the exhaust manifold from the underneath.
Any comments?

[libbydiesel]

Boosting above your turbos stock  range will add some heat regardless of fuel.

If fueling remains the same, adding more boost lowers EGTs, it doesn't raise them.