[BadDSM]

I want to know how a 1g 5 speed turbo engine differs from a 1g NT engine.
I know they are both 4g63s and that the NT has a higher compression ratio but are the blocks, cranks, heads, intake manis, throttle bodys, etc the same?
Thanks in advance for any information,
Evan

 

[kengsx]

This is based on my experience of installing a turbo engine in a GS.

Different based on the following (list not complete):
NT block has no oil squirters
Pistons/Compression
Crank girdle reinforcement
Cams
Throttle body
NT oil pan has no inlet from turbo
Knock sensor
Front motor mount
Fuel (injectors, pump, etc.)
Air (MAS, turbo, intercooler, piping)
Front coolant pipe
Transmission (not just the unit, but the position of the axles is slightly different making it impossible to install an equal length half shalf)

Common parts:
Crank, rods, head, intake manifold, balance shaft nonsense, timing belt parts, seals and gaskets, coil packs and other ignition parts other than plugs

 

[BadDSM]

Thanks for the info.
How about the MAF, coil pack, axles?
How big are the nt injectors?

 

[BadDSM]

How about the radiator and fans? Same?

 

[kengsx]

radiator is very different, the NT is thin and not big enough at all. The fans are the same. The coil pack is the same (ignition parts as I mentioned). MAS/MAF is smaller for NT, injectors are much smaller and are high impedance on the NT, that said the turbo has a resistor pack. Axles are different, especially the longshaft on the driver side. There are other differences like the wiring harness, but the NT can be adapted with little trouble. The vacuum lines/emissions are different, of course the exhaust system and exhaust manifold... Also the suspension is different, brakes are same on NT's as early 1G turbos (small).

There are countless differences, but many are easy to change and some not necessary like the instrument cluster. While I'm on similarities, the alternator, AC, power steering components, hubs/wheel bearings, are all the same. Do a search on Mavisky, as he is one of the people that did the swap (the first or close to it).

 

[mavisky]

radiator is very different, the NT is thin and not big enough at all. The fans are the same. The coil pack is the same (ignition parts as I mentioned). MAS/MAF is smaller for NT, injectors are much smaller and are high impedance on the NT, that said the turbo has a resistor pack. Axles are different, especially the longshaft on the driver side. There are other differences like the wiring harness, but the NT can be adapted with little trouble. The vacuum lines/emissions are different, of course the exhaust system and exhaust manifold...

There are countless differences, but many are easy to change and some not necessary like the instrument cluster. While I'm on similarities, the alternator, AC, power steering components, hubs/wheel bearings, are all the same. Do a search on Mavisky, as he is one of the people that did the swap (the first or close to it).

I just installed a radiator from a 1g awd into mine (which still had the nt radiator) and there was no difference at all. Also I ran my nt radiator for 4 years and it never overheated once except for when the hose sprung a leak, oh and the one time I melted a hole in the piston it tried to, and the time the fan quit working for one day mysteriously.

Also the crank girdle is identical as far as I can tell. Unless we're talking millimeters here since I never measured. The front motor mount on mine (for a fwd) was the same as well.

 

[am00re34]

I know the radiators from 1g 2.0 non turbo are the same as the turbo ones. i've swapped the 2 numerous times.

I've also noticed the cross member on my 92gs is different then on my 90tsi. it could be the years, but they are different

 

[kengsx]

The NT radiator is indeed thinner, by about half. People on this board have reported overheating with it on a turbo car, so that's what prompted me to swap it. I was basing the front motor mount difference from my AWD, so I think the difference is between FWD and AWD and not turbo/NT. I'll take another look at the girdle, I seem to remember the lack of reinforcement bridges between bearing caps, but maybe that was a 4G64 or G4CS.

 

[mavisky]

Ken I hate to disagree, but the two I have are the exact same thickness. I'm not saying yours wasn't. But I know that my 92 nt is the exact same size as the 91 awd I just put in it.

I've got 3 motors with one nt.

 

[kengsx]

http://www.dsmtalk.com/forums/showthread.php?t=125925

(why won't this hyperlink? might have to copy/paste)

My experience was with a 5spd 92GS radiator that had the same size end tanks, but the core stepped down in size by about 0.5" on either side (picture an "I"), whereas the radiators on turbo cars step in about 0.25" on either side. I wish I still had the radiator to measure but I threw it in the trash.

Maybe there are different radiators for autos, and different years, since I can't explain why the ones you had were the same thickness.