GARRETT TURBO?

[jtanguay]

the blow off valve opens at around 10-12 psi anyways, so if you're looking to get more boost than that, you don't need it.  (was just added as a safety device incase your wastegate was broken)

[TDIMeister]

there's a bit more lag around town, but it's still a huge improvement.

So if that's the case, how is it better?  Markedly and measuredly more horsepower, lower fuel consumption?

[andy2]

Bert, You'll have to cut/Grind a peice from the aaz intake manifold as it interfers with the T3's compressor housing.

My main reason for swaping the ko3 to T3 on my dads aaz was due to the ko3 being worn out (oil out the exhaust).T3/k24's are easy to find and are a cheap way out of replacing the ko3$$.Try finding a good used ko3 :lol:.

My dad tows with has passat wagon so by replacing and upgrading at the same time for less money we were able to keep EGT's at 1150 deg where before with the ko3 on the same 15 psi would peg the pyro with fuel upped and intercooled.Just my 2 cents

[bert]

Andy,yes,i found that little piece of alloy to be a problem,so out came the hacksaw and file  :wink:
Now sitting snug on the 1.9
Its a vw exchange engine with a brand new fuel pump on it,so it should be ok,hopefully it will fit nice into my mk1 golf,the complete mk3 golf with the new aaz cost me £300 quid,so im happy as larry  :lol:
Bert

[addautomotive]

So if that's the case, how is it better?  Markedly and measuredly more horsepower, lower fuel consumption?

Noticeable difference in power on the highway. There are a couple long, steep hills that used to have me going into 4th to maintain 100km/hr near the top. Now I can stay in 5th and easily maintain 110 km/hr up the same hills. Also much easier to pass on the highway, even uphill.

Most of my driving is on the highway, so a little extra lag is not an issue for me.

[VentoTD]

Ok, so what is a good choice in turbo from garret gt? assuming you want about 200hp. I'm now running t25, from a nissan s13. It 's a bit slow spooling, need to get above 3500rpm to get things moving... looking to get a better turbo but a bit confused about how to convert gasser hp to diesel hp

[935racer]

For 200WHP go with a gt22.

[James]

I have a question for you guys. I have vw diesels (1.6) and audi  etc. My neighbor has gas vws 1.8l  1986 golf. He claims that if I give him one of my stock garrett turbos and manifolds etc it will bolt right on to his gasser and perform well. I think he is out of his mind although I agree with the bolt right on part. I think from the little I know about turbos that the AR of the diesel turbo is unsuitable for a gas engine and would cause more problems than power   WHAT DO YOU GUYS THINK?

[935racer]

Without tuning it will perform poorly, with tuning it will perform OK at best, the ar of your garret turbos are too small to be really effecient for that 1.8 gasser. Been there done that.

[VentoTD]

gt22
Horsepower 150 - 260
Displacement 1.7L - 2.2L

Sounds like same "size" as my t25 which have been known to push 260hp.
The point is that I want early spooling, full boost at 2500 rpm.
Would the gt22 do that, I know it impossible to say for sure, but give me an estimate.

[DVST8R]

gt22
Horsepower 150 - 260
Displacement 1.7L - 2.2L

Sounds like same "size" as my t25 which have been known to push 260hp.
The point is that I want early spooling, full boost at 2500 rpm.
Would the gt22 do that, I know it impossible to say for sure, but give me an estimate.

The problem with the HP estimates and displacement estimates, is that is for a gasoline engine not diesel, so it throws things outta wack.

As far as spooling by 2500rpm... depends on how well your head flows, and how much fuel you got. Stock not a chance. 12mm pump with a ported 1.9 head, I would say you would be really close, through a VNT turbine housing on it and you would easily make it.

[VentoTD]

"The problem with the HP estimates and displacement estimates, is that is for a gasoline engine not diesel, so it throws things outta wack."

As I suspected... How can i sorta accuratly estimate/convert gas numbers to diesel?

"As far as spooling by 2500rpm... depends on how well your head flows, and how much fuel you got. Stock not a chance. 12mm pump with a ported 1.9 head, I would say you would be really close, through a VNT turbine housing on it and you would easily make it."

12mm pump with a ported 1.9 head is the only way to go right? Anyway thats what I've got. And of course my custom intake and ex manifolds and 3" expipes. The guy that modded my IP said that I would need ~2.2 bar boost pressure to match the amount of diesel. The only thing I havent sorted out is the right size turbo, since my current t25 is to big.

[935racer]

The camshaft also makes a large difference in how soon your turbo spools. AS for manifolds they are crucial, but not all manifolds are created equal, post some pictures of you manifolds I can help you determine how much they are helping or hurting your performance.

I would likely run the gt22 on your setup.

[VentoTD]

Had a nice talk to a garret salesguy today. He said that I should go with a gt28rs, he claimed that 200 diesel ponys, is = 200*1.7 gasser ponys. The gt28rs had a max power rating at 360 (gas). I just hung up on him. He wanted me to go bigger, nutcase.

I have factory cam, not entirely convinced that other cams work... Anyway my thought when modding the intake was to get even flow to all cylinders. Doesnt look all sofisticated, but it works. Exhaust manifold, just followed standard procedure from a gasser.

pics here:
http://200sx.kicks-ass.net/gasbjorn/

[TDIMeister]

Here's a primer for reading compressor maps and turbo matching basics.
http://forums.tdiclub.com/showthread.php?t=148730

I see that the Garrett website also has a great tutorial of the same subject at http://www.turbobygarrett.com