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Author Topic: raising boost ?'s  (Read 5519 times)

August 20, 2008, 07:52:38 pm

mainer

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raising boost ?'s
« on: August 20, 2008, 07:52:38 pm »
i've got a 90 jetta with a 85 1.6 td swapped in.

80k with 40 over pistons fresh 2 notch gasket (had a 1 notch) and new stretch bolts.

has a k24 turbo.

i turned the max fuel screw up about 1/3 turn and sligthly adjust the start wheel/ boost pin. it now smokes quite a bit and i'm guessing i'm only seeing the stock boost of 10 psi.

what can i do to get some more psi out of it? T into the metal line going to the wastegate?? or is it possible to just adjust the wastegate. what is the same boost limit?


thanks
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Reply #1August 20, 2008, 08:34:42 pm

Jet A

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raising boost ?'s
« Reply #1 on: August 20, 2008, 08:34:42 pm »
I have heard 15-20 is safe. im shooting for 25 to see what happens.


You know....with studs in your cummins, you should be able to push 40-45 psi or so........ :D
I know those motors inside and out....the vw's i am just learning.
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Reply #2August 20, 2008, 09:19:27 pm

jtanguay

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raising boost ?'s
« Reply #2 on: August 20, 2008, 09:19:27 pm »
don't forget to block off the blow off valve.  there is an adjustment screw that you can screw right in....
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Reply #3August 21, 2008, 10:57:13 am

saurkraut

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raising boost ?'s
« Reply #3 on: August 21, 2008, 10:57:13 am »
Quote from: "jtanguay"
don't forget to block off the blow off valve.  there is an adjustment screw that you can screw right in....


You can't screw it down enough to close it completely and screwing it in only makes it change about 2 PSI.  You have to take the screw out, find a short allen screw that will drop down the hole.  Put the small allen in the hole, CAREFULLY re-thread the screw in, and tighten it down againsts the smaller screw, and then it will be locked shut.

If you have a pre-turbo EGT measurement, and a full 2.5" exhauste proceede as follows

With a K24, the screw in the waste gate dash pot does very little, but you can successfully screw the waste gate shut with it, which will get you 30+ PSI.

The easyiest way to get more boost is to back out the banjo bolt on the waste gate line.  Fill it with copper permatex. let it cure.  Unscrew the line at the waste gate, and leave it loose.  Put the permatex filled banjo bolt back in and snug it down.

The waste gate will blow open at 20 to 25 psi from pressure on the valve.

I recomend putting the fuel screw back to where it was, and rotate the boost pin to 3/4 of the ramp.  Take it for a drive and see how you like it.
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Reply #4August 21, 2008, 07:26:11 pm

Smokey Eddy

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raising boost ?'s
« Reply #4 on: August 21, 2008, 07:26:11 pm »
Quote
and rotate the boost pin to 3/4 of the ramp


Sorry, which is this?
I turned my fuel screw and drove a little but learned the concequences. (thankfully no damage) What is the boost pin of the ramp? i don't understand what you mean by ramp or boost pin?
Sorry I don't know the in's and out's of the IP
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Ed
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Reply #5August 21, 2008, 08:06:52 pm

VW_Commuter

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« Reply #5 on: August 21, 2008, 08:06:52 pm »
If you look at this post over at the vwdieselparts.com forums in Fig. #1 item #8 is the boost pin.  The write up explains how the LDA works.
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Greg

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Reply #6August 21, 2008, 08:12:18 pm

Smokey Eddy

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« Reply #6 on: August 21, 2008, 08:12:18 pm »
Ohhhhhhhhh okay
so turn it CW or CCW?
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Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD
Reply #7August 21, 2008, 08:34:18 pm

VW_Commuter

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« Reply #7 on: August 21, 2008, 08:34:18 pm »
If you look at the pin, the slope of the cut changes as you rotate the pin.  When you take the cover off the LDA and look at the top of it there is a dot (I don't remember what the color of the dot is, it might be white or silver) and that dot is exactly opposite of the steepest slope of the pin.  If you turn the pin so the dot is towards the passenger side of the car you will be on the shallowest slope of the pin and conversely if you put the dot to the drivers side of the car you will be on the steepest slope of the pin.  I would put it so it  is towards the back of the car and maybe a little towards the drivers side and see how the car responds.
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Greg

'06 Golf TDI traded in for a '12 Jeep Rubicon (the Phatbox is available)
'91 Jetta TD, a work in progress (I'll do a build thread when I start in earnest)
'65 Notchback, a project not yet started
Reply #8August 21, 2008, 11:44:53 pm

Smokey Eddy

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« Reply #8 on: August 21, 2008, 11:44:53 pm »
Hmmm
Alright. So that nut on the top over the stud with the allan head... leave that alone?
Can you run me through what to do briefly. I know if you try to take the nut off the top the whole thing spins and from the diagram it looks like that changes protrusion of this pin we're talking about onto the cone? or does it just hold everything together quite innocently...

How should I go about turning this pin?
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Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD
Reply #9August 22, 2008, 05:12:42 am

VW_Commuter

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raising boost ?'s
« Reply #9 on: August 22, 2008, 05:12:42 am »
The nut on the top of the LDA just sets the starting point for where the boost pin is, it doesn't rotate the pin.  The post over at vwdieselparts.com forums has an excerpt from the Bosch VE Pump manual that I posted and it explains exactly what parts of the LDA do what.
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Greg

'06 Golf TDI traded in for a '12 Jeep Rubicon (the Phatbox is available)
'91 Jetta TD, a work in progress (I'll do a build thread when I start in earnest)
'65 Notchback, a project not yet started
Reply #10August 22, 2008, 12:48:38 pm

stewardc

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raising boost ?'s
« Reply #10 on: August 22, 2008, 12:48:38 pm »
On eBay for $9.00.

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Reply #11August 22, 2008, 01:06:02 pm

blkboostedtruck

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raising boost ?'s
« Reply #11 on: August 22, 2008, 01:06:02 pm »
steward you got a link to that controller? thats nicer than the 5buck flea bay special i bought!
Duane
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Reply #12August 22, 2008, 01:43:42 pm

stewardc

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raising boost ?'s
« Reply #12 on: August 22, 2008, 01:43:42 pm »
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Reply #13August 22, 2008, 01:54:24 pm

blkboostedtruck

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« Reply #13 on: August 22, 2008, 01:54:24 pm »
perfic thanks stew!
Duane
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injector rebuilds call  414-840-1395 for faster service not on line much!
'66 variant 1500S
'81 2dr n/a 1.6 diesel rabbit 8"lift 260K R.I.P.
'81 caddy gas 1.8 turbo/stroker W/N.O.S.
'81 caddy 1.9 turbo diesel
'82 caddy gas 1.8 G60
 3 jettas '82' '04 '14TDI
+1 rabbit,03 HD sc.eag. duece,46,&5
Reply #14August 22, 2008, 02:19:04 pm

stewardc

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raising boost ?'s
« Reply #14 on: August 22, 2008, 02:19:04 pm »
I think I'll install one of these, myself. 2-stage baby

http://agpturbo.com/product.php?productid=16157&cat=255&page=1
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