Garrett GT2056 turbo

[vanagonturbo]

Shimmed 6 or 7 mm. I dont remember cause its been so long! Lol!

[RabbitJockey]

i was going to mention tdi cams are not as good as 1.6 or 1.9 cams, actually for tdi people 1.6 and 1.9 cams would be a cheap upgrade from what i understand, looks like ur work backs up this idea.

[RabbitJockey]

also this is very exciting, can't wait to hear more, would love to see an in car movie as well.  i would think you should be able to get more boost sooner, its a bb turbine and all right.

[vanagonturbo]

Journal bearing My GTD lost 5th this morning on the way in to work, so I probably will have a video or 5 I record all of my commutes via dash-cellphone cam. I'll see if I can post one tonight when I get home.

[RabbitJockey]

question: why do you record your commutes

[vanagonturbo]

Two reasons:

1. about 7 months ago, there was a bunch of construction on the freeway and they had ground the pavement down. They didnt clean it and my car and I entered into a gravel storm where they were working. Called the contruction company to see if they would pay for my headlights that now had holes in them and they told me that since I could not PROVE there was a gravel storm (thrown up from other cars) that it didnt happen. They denied my claim and I am out of pocket $250.

2. so I can record morons and their license plate numbers and put it on the internets

[RabbitJockey]

sounds fun 

[410]

Wow, hard to believe the cam made that much of a difference!  Sharing your findings is so valuable to the rest of us.  Thank you!

[blackdogvan]

i was going to mention tdi cams are not as good as 1.6 or 1.9 cams, actually for tdi people 1.6 and 1.9 cams would be a cheap upgrade from what i understand, looks like ur work backs up this idea.

AAZ in TDI is a debatable concept. From what i've gleamed from the forums is if your cam is perfectly timed there is a zero valve clearance degree according to some. Others have actually seen valve piston contact evidence. I chickened out on my build & pulled the AAZ cam I originally planned in my mtdi.

[vanagonturbo]

Wow, hard to believe the cam made that much of a difference!  Sharing your findings is so valuable to the rest of us.  Thank you!

No prob. I have to admit I was rather skeptical myself. I did measure both cams when they were out. Base circle was the same between both and the AAZ cam had .5mm more lift. Take that for what its worth. I think the change in duration was the biggest factor. I drove it home tonight (GTD broken ) and it felt more laggy than with the AAZ cam. However, it does get to 25psi at high rpm. The wastegate has since been disconnected again. So i am not sure what to make of that. Like I said before, I need to fiddle with the pump and see what comes of that... I built the motor for 35psi+ so I am still not satisfied. After LOTS of reading I see stories from people about wheelspin in second and sometimes third, but maybe its the wheel/tire combo. The car has 205/45/16's (iirc) and the only time I get wheelspin is up a hill in 1st after driving through a puddle LOL! I am contemplating putting the gt2560r back on just to see what it does...

I have no video of my commute. I honestly did try, but the windshield is dirty and my suction cup mount did no want to cooperate. I tried to ask the dog to hold the phone, but that didnt work out at all!

[vanagonturbo]

i was going to mention tdi cams are not as good as 1.6 or 1.9 cams, actually for tdi people 1.6 and 1.9 cams would be a cheap upgrade from what i understand, looks like ur work backs up this idea.

AAZ in TDI is a debatable concept. From what i've gleamed from the forums is if your cam is perfectly timed there is a zero valve clearance degree according to some. Others have actually seen valve piston contact evidence. I chickened out on my build & pulled the AAZ cam I originally planned in my mtdi.

Very interesting. Although my Scirocco is not a TDI (for now), you have me curious. One would think that interference would be evident during the checking stage (rotate engine by hand twice before running). I wonder if its possible that those engines in question had previous contact before and attributed it to the cam swap...

[vanagonturbo]

False positive on my part about the cam idea. I decided to find out why it was so laggy today. Well, because I am stupid and keep messing with too many things at once and not writing it down, I found that after I had shimmed the wastegate so it wasnt binding to keep me at 15psi, it had once again held it open a little. There is a little light to it though, surging starts at 18-20psi now instead of 15-16psi.

As was mentioned before about fueling, I cranked this little pump up until there is no more fuel for it to deliver. Still surges. Although I dont quite understand how more fuel could help with the surging. :confused:

[410]

Do you have a port of some kind on your exhaust manifold?  It would be interesting to hook up a gauge to measure exhaust manifold pressure and how that pressure compares to the surging if at all. 

[vanagonturbo]

I have a port for a pyrometer. I also have a backpressure guage. I think the EGT probe hole might be a little small though? I am down to offer my time for testing.. i will make sure to document each change.. promise

edit: I might also add that the DP is 3" and the rest is 2.5" with no muffler or any sort of resonator... sounds pretty neat

[Alcaid]

surging starts at 18-20psi now instead of 15-16psi.

What's the rpms when you hit surge?