How much boost pressure should my 1.6 TD have?

[scrounger]

It is an 86 Jetta 1.6 TD. 5 speed. It is in good shape and stock.
I have not put a boost gauge in it but am planning on doing it.

Have done a few searches but nothing comes up.
Thanks for your input.

[vanbcguy]

Stock boost is 9 PSI.

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[scrounger]

Thanks for the prompt response, 9.
Any thoughts on how much will it stand for a long time?

[CrazyAndy]

Depends on what turbo.  K24?

[scrounger]

Oh sorry, I thought that I had mentioned, it is stock. I have had the car for 2 years and never checked the boost level or even looked at the turbo.

[CrazyAndy]

If you can get a pic, I or somebody else could tell which turbo it was.  M

y money is on the K24, though.  On that turbo, you can make up to around 24 psi reliably, but expect your EGTs to rise in time with the boost pressure.

If it is a T3, however, you are better off.  EGTs are less since it has less hot side restrictions, and you can even swap a more efficient 80's Volvo T3 compressor housing and wheel so the boost comes in sooner.  Trev0rbr told me this, but I might have fudged the reason; but that's what I want to do, and I hope he chimes in on this thread.

[RabbitJockey]

Stock boost is 9-12psi.  Reason for a compressor upgrade is more efficiency and more flow, I can't say whether it would spool faster or not

[scrounger]

Thanks much for the info and edjumacation. I am going to get my boost gauge installed.
Would this small line from the manifold to the fuel injection pump be a good one to cut into?

Thanks.

[theman53]

That line works. You can T into it right by the fuel pump.

[scrounger]

Thanks I Tee'd into that tube and fished in a tube into the dash area. I get 3 psi at 60 and can make it go to 9 with full throttle.
 
It is a bit sluggish IMO. I have a 85 Mercedes Benz 300 TD and it runs 5 psi at 60 and can get to 14. When you push it down it jumps right up in maybe a second or two. the vw has to let the RPM build.

Guess that is why many switch turbos on their vw's.

[RabbitJockey]

Increasing your fueling will make it spool alot faster, combine that with a boost controller and I think you'll be surprised.  The mbc holds the wastegate shut longer instead of opening it progressively with boost

[scrounger]

Trev
Questions?
MBC, I made one on my Merc.



It jumped my boost from 9 to 14. Nice feel.

[burn_your_money]

A better exhaust will make a nice improvement as well.

[scrounger]

I have to re-engineer the brass T fitting to accept the metal lines. Anyone have pictures of their mbc.

My engine revs just like a gas one. My MB turns up like my tractor almost. It does put out the boost with a very quiet sound.

[RabbitJockey]

Metal lines so u have a k24.  You can just cut the metal lines and slide rubber hose over them, put a zip tie around them to help keep things from popping apart.  K24s spool up pretty nice,  they're not an instant shot but once u put a mbc on and increase fuel it won't disappoint