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Engine Specific Info and Questions => IDI Engine => Topic started by: wiener on July 07, 2011, 01:14:51 pm

Title: how do you adjust turbo boost on an AAZ?
Post by: wiener on July 07, 2011, 01:14:51 pm: How do I adjust the boost on my 94 1.9 TD with an AAZ engine?
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on July 07, 2011, 01:24:56 pm: you need a boost controller.
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: rwdriver on July 07, 2011, 02:58:27 pm: you can just ajust the rod at the back of the turbo. The closer the wastegate arm is to the end of the shaft, the more boost.
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on July 07, 2011, 03:33:00 pm: Quote from: rwdriver on July 07, 2011, 02:58:27 pm
you can just ajust the rod at the back of the turbo. The closer the wastegate arm is to the end of the shaft, the more boost.

thats not a very accurate way of adjusting it tho, you can go overboard really easy that way..

boost controllers are cheap, reliable, and EASY TO USE..

some you can adjust on the fly while in the car..
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: dieselweasel on July 08, 2011, 10:15:00 am: Your '94 should have a K14 turbo, so there's no external wastegate arm. Look for the wastegate canister, loosen off the nut (10 mm IIRC), and turn the screw in for more boost. I turned mine in all the way then backed it off about 1/4 turn and rarely see in excess of 15 psi. A boost controller would work too :P
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on July 08, 2011, 10:20:44 am: Quote from: dieselweasel on July 08, 2011, 10:15:00 am
Your '94 should have a K14 turbo, so there's no external wastegate arm. Look for the wastegate canister, loosen off the nut (10 mm IIRC), and turn the screw in for more boost. I turned mine in all the way then backed it off about 1/4 turn and rarely see in excess of 15 psi. A boost controller would work too :P

there again, not a very accurate way to adjust boost..

you might turn it a couple turns, and see a couple PSI boost, but then thread the wastegate adjustment in a couple more turns, and your up over 20 psi..

boost controllers are cheap, and adjusted much easier.. 1 turn on the boost controller knob = 1 psi more boost..

boost controllers work better than adjusting the wastegate, and make the turbo spool quicker.. it holds the wastegate closed until a set pressure, then POPS it open quickly..

a normal wastegate starts opening before the max boost is reached.. makes for longer spool up times..
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on July 08, 2011, 12:20:57 pm: and for gods sake, you can build your own boost controller if you arent a total dur-de-dur... for atound $5..
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: wiener on July 14, 2011, 02:52:16 am: I guess it is a K04,with more fuel and no governor how much boost will I get?
And thanks guys.
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: Alcaid on July 14, 2011, 05:50:06 am: Quote from: R.O.R-2.0 on July 08, 2011, 12:20:57 pm
and for gods sake, you can build your own boost controller if you arent a total dur-de-dur... for atound $5..

And for the lazy ones, they can be bought for 20 bucks ;) Ebay search: nxs boost controller
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on July 14, 2011, 09:12:37 am: Quote from: wiener on July 14, 2011, 02:52:16 am
I guess it is a K04,with more fuel and no governor how much boost will I get?
And thanks guys.

someone upgraded it at sometime then. they came stock with a K03, witch looks very similar to the k04.. sure its not a K03?
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: wiener on July 16, 2011, 01:20:30 am: Sorry I meant K14. It has a screw with a locknut
I can hit 25 lbs boost sometimes but boost often drops from 15--20 lbs. to 10 lbs,any ideas?
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on July 16, 2011, 11:17:41 am: Quote from: wiener on July 16, 2011, 01:20:30 am
Sorry I meant K14. It has a screw with a locknut
I can hit 25 lbs boost sometimes but boost often drops from 15--20 lbs. to 10 lbs,any ideas?

HOLY CRAP! your gonna kill that poor turbo!

20 is all the more those turbos are happy making..

it gets boost spiking because you didnt get a boost controller. thats exactly what it does when its cranked up too far..
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: wiener on July 16, 2011, 10:57:50 pm: Cool I will get one soon. Can I run 20lbs boost safely?
What would your choice for an upgrade on the turbo?Am planning on FMIC too
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on July 18, 2011, 10:21:25 am: Quote from: wiener on July 16, 2011, 10:57:50 pm
Cool I will get one soon. Can I run 20lbs boost safely?
What would your choice for an upgrade on the turbo?Am planning on FMIC too

NO.. 20psi is not safe with that turbo. its just a hot air pump at that point. 15 psi is all the more boost these turbos are happy making..

the engine will gladly take 20 psi all day long, but the turbo wont happily supply it..

good luck trying to return the wastegate back to its stock setting..

(unless you counted the amount of turns you screwed that screw in)

its not gonna regulate boost very good now that you altered the spring tension in the wastegate. its gonna be erratic/spikey at best, but you already figured that out..
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: wiener on July 21, 2011, 01:30:59 am: sometimes I learn the hard way
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on July 21, 2011, 11:37:55 am: Quote from: wiener on July 21, 2011, 01:30:59 am
sometimes I learn the hard way

appearently, because i told you the right way to do it the first time..

*your turbos life will be significantly shorter if you keep running it up over 20 psi*
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: wiener on July 21, 2011, 09:55:25 pm: I made the changes a year ago but have only driven it 10 weeks since then.
Fun when the boost hits but time to upgrade to better turbo and intercooler.Any ideas for a turbo?
I plan to put boost controller on soon as I can.
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: wiener on September 08, 2011, 08:33:10 am: Got my BCV installed and set,now my boost peaks at 17psi.
thanks for the help guys.
Next move K24 and FMIC.
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: rallydiesel on September 08, 2011, 09:15:56 am: How about just the FMIC? k14 is the best street turbo IMO unless you are willing to go compound or vnt.
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: wiener on September 11, 2011, 06:09:23 am: Compound sounds very interesting.
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: R.O.R-2.0 on September 12, 2011, 07:52:15 am: Quote from: wiener on September 11, 2011, 06:09:23 am
Compound sounds very interesting.

compounding is not for the weak at heart..

basically required to use head studs, AAZ metal head gasket, and lots of fuel..
Title: Re: how do you adjust turbo boost on an AAZ?
Post by: wiener on October 02, 2011, 05:48:27 am: BCV installed and wastegate reset.
Been running it for a month now (15psi boost) runs great
thanks for your help guys.