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I can go up hills now :) by dokarex on 21 Jan, 2010 10:32
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I figured it was time to turn up the boost on my AAZ in the Doka to get a little more power. I've turned the fueling up a little and have a 1.6 lda pin, and a gasser tranny, but still had problems on some of the local hills, not many but they are steep. I borrowed a vacuum/boost tester from a local mech and put in in the lda line it read no boost at all
The wastegate was rusted/stuck open(K03) so a lot of penetrant and a little wiggling with a pair of vise grips and it loosened up and I now have it set at 9psi(for now). I took it for a drive on the steep hills on the highway where it use to slow down to 80kph at full throttle and it now will actually accelerate up hill and easily hold 105kph:D
Now don't call me dumb not to notice the turbo wasn't working
the original engine in the Doka was a 1.6na diesel and the 1.9 even without the turbo was a big improvement 
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#1 by burn_your_money on 21 Jan, 2010 17:38
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Good to hear. Just watch those EGTs
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#2 by arb on 21 Jan, 2010 20:24
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as soon as I install my EGT, my waste gate will become a thing of the past.
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#3 by Rabbit on Roids on 22 Jan, 2010 06:54
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as soon as I install my EGT, my waste gate will become a thing of the past.
why not just use a boost controller? (build one for 5 bucks) cause there are going to be times when you want wide open throttle, but not 40 psi boost. and the only way you wont have that, is with a wastegate and boost controller. you will easily get 25 psi with no wastegate, and will shorten the life of your turbo substantially. just something to think about... -
#4 by jack's lack on 22 Jan, 2010 07:19
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as soon as I install my EGT, my waste gate will become a thing of the past.
why not just use a boost controller? (build one for 5 bucks) cause there are going to be times when you want wide open throttle, but not 40 psi boost. and the only way you wont have that, is with a wastegate and boost controller. you will easily get 25 psi with no wastegate, and will shorten the life of your turbo substantially. just something to think about...
x2
I had my wastegate disabled for a day. I couldn't get much past half pedal on the on-ramp before the needle was pegged at 30psi. I backed the screw out about a turn which has me at about 15psi, and I have ordered a boost controller.
Beyond just shortening the turbo's life, you don't want it to grenade and send metal into your engine, or blow a seal and runaway. Either of those scenarios would cost way more than another junkyard turbo. -
#5 by arb on 22 Jan, 2010 09:54
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as soon as I install my EGT, my waste gate will become a thing of the past.
why not just use a boost controller? (build one for 5 bucks) cause there are going to be times when you want wide open throttle, but not 40 psi boost. and the only way you wont have that, is with a wastegate and boost controller. you will easily get 25 psi with no wastegate, and will shorten the life of your turbo substantially. just something to think about...
Wow, I never thought my tiny turbo could get past 25 psi - right now it has never gone past 9 psi. My BOV is gone, so maybe my WG controller needs adjustment. Did you post how you make your controller ? -
#6 by Rabbit on Roids on 22 Jan, 2010 11:04
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as soon as I install my EGT, my waste gate will become a thing of the past.
why not just use a boost controller? (build one for 5 bucks) cause there are going to be times when you want wide open throttle, but not 40 psi boost. and the only way you wont have that, is with a wastegate and boost controller. you will easily get 25 psi with no wastegate, and will shorten the life of your turbo substantially. just something to think about...
Wow, I never thought my tiny turbo could get past 25 psi - right now it has never gone past 9 psi. My BOV is gone, so maybe my WG controller needs adjustment. Did you post how you make your controller ?
no, i didnt, but theres about a million different DIY sections on different ricer forums. i pulled my design right out of my own brain. and it worked alot better than the one i copied from the online page. the one that the ricer section had a detailed build of, worked alright, but at higher boost pressures it just wouldnt work that well. it would still let the wastegate open too soon. so i put a tighter spring in it, drilled a bigger bleed hole, and put a longer, more adjustible bolt in it. i swear i can set this thing up to work with 50 psi boost, and still be operating a standard 8psi wastegate.
i put it on my audi when it was still alive. and it was amazing. cause it would smoke black before, but after i set it up to run 25 psi, it would only smoke for a split second until boost came up.
didnt you say that you are running a goofy VNT 15 on an audi manifold or something? well, i guess its not a VNT if you got a wastegate huh? so it must be a normal GT15 like off a Saab or something? either way, yea, it should make at least 20 psi fairly safely. my GT17 VNT makes around 35 psi boost, ive seen it with my own 4 eyes.
if i were you, i would build a boost controller, and then set the turbo for at least 15 psi. these diesel engines are STUPID if they have under 15 psi. but thats just my opinion, i like going fast. and 90% of the time, when you increase boost, you actually decrease EGTs. intercoolers rock too, just so you know. (massive improvement with no other mods)