Are they the same?

Kranz · 11-08-2009

Hi I have a question and would like some in put on, Since I am new to owning a DSM. I have a 90 talon tsi awd and was wandering if the turbo 4g63 is the same as the na 4g63 the g1 6 bolts? Far as the internal like the cams the head, block, crank, and so on. I have herd that they are not but when I looked in my Chilton book for the 90 to 94 models the turbo and na the specifications where the same for the most part and on the same page. The page I am looking at is 3-4 of the engine and engin overhaul. The reason I ask this is that I am going to rebuild my engine is the spring. I would do it now but things are tight and a little research wont hurt. I found it is easer to find a na motor than a turbo motor in the junk yard. If you have any other in put on do and don’t's on these engine for me that would be great.

twack · 11-09-2009

to my knowledge the na has slightly less aggressive cams and higher compression pistons, that you will probably want to change out if you want anything over stock boost. but if your rebuilding i dont see why you cant fix these errors. Also i believe it dosnt have oil squirters. obviously the head gasket is not the same as a turbo car. no knock sesnsor. other then that they are they same. the injectors might be smaller but im not sure. i might be wrong anyone can chim in and correct me

95talonracer · 11-09-2009

No oil squirters, higher comp pistons, different cams, no knock sensor, so I would say rebuild the turbo motor you have or if you need a block I have a turbo 1g 6 bolt block for cheap. PM me if you need one.

Kranz · 11-09-2009

So are the heads the same jest the cams are different? Also the na and the turbo do have the same crank and connecting rods right? and are the oil pumps the same to? I know is am asking a lot of simple questions but how do you learn without learning the hard way lol. So the in put is greatly appreciate and waiting for more.

**Tachyon** · 11-09-2009

Hey Kranz,

The heads are identical with the exception of the camshafts (this excludes the 1990 Turbo, which had the same profile as the non turbo). The rods, and oil pumps are the same as well.

The major differences being already stated as the oil squirters, and pistons. and possibly oil cooler. I had NT block that did have a knock sensor hole so you might be fine there. And yes, it is completely find to run without oil squirters.

**Goat Blower** · 11-09-2009

The non-turbo pistons are a different alloy, and can't take the abuse as well as turbo pistons. Everything else is fine.

twack · 11-09-2009

Quote:

Originally Posted by Goat Blower

The non-turbo pistons are a different alloy, and can't take the abuse as well as turbo pistons. Everything else is fine.

i know many people have turboed the NTs but how much boost can they take, or is stock boost from a 14b pretty much the limit?

Kranz · 11-12-2009

Thanks for all of the good info guys this help me a lot. Also is the NTs 4g63 the same from 90 to 94 right? Also if I wanted to use a NTs and turbo it and put more boost to it than stock is to change the pistons and use a turbo head gasket right? and swap cams. I would keep the turbo block and build it up and run a NTs for the time being. also any more tips or do and don't would be great and greatly appreciated.

munchgsx · 11-12-2009

If you run without the squirters make sure to port the oil relief valve on the oil pump housing. There will be insane oil presure without doing this. I run a N/A block in my car with turbo guts, no issues.

I think past April 92 the NA also went to the 7-bolt crank.

Kranz · 11-12-2009

Thank that is good to know and if is a 7 bolt would still work right? if it is be for 94 right? What is a good way to port the oil relief valve to.