JLee's 1991 Toyota MR2 Turbo build thread

[skyking]

That weakens the weld and is not necessary. removing material at a weld is done only to smooth it out for some functional purpose or to remove stress risers.

 

[Howard]

That weakens the weld and is not necessary. removing material at a weld is done only to smooth it out for some functional purpose or to remove stress risers.

For something like this, yes, it isn't necessary, but I don't think you get any extra strength from the extra material out of the joint. At least he could buff off the oxidation...

<- goes to weep

 

[jlee]

For something like this, yes, it isn't necessary, but I don't think you get any extra strength from the extra material out of the joint. At least he could buff off the oxidation...

<- goes to weep

It's still in the back of my car and hasn't been installed yet...calm down already.

I'm going to clean up the old nasty weld a little before the downpipe goes on - but for now, I'm going to put the turbo in and see how the dump tube fits.

 

[JCH13]

For something like this, yes, it isn't necessary, but I don't think you get any extra strength from the extra material out of the joint. At least he could buff off the oxidation...

<- goes to weep

Those familiar with the nuances of welding stainless steel know that those are generally the colors you generally want to see when you're done welding stainless, mine may be a *little* on the dark side. They indicate good gas coverage and a clean weld. A crappy/dirty/brittle weld can be buffed out to make it all nice and shiny too, and you'd never know the difference until the weld cracked.

Besides, it was my first time TIGing steel in about 2 years, so cut me some slack :awe:

 

[skyking]

Looks good! I've been welding for 35 years, have fabbed and inspected in the aerospace industry. The berries gotta go so nobody gets hurt, but other than that buff it up

Did you use backup gas?
Edit: never mind, I can see in the pictures. It was a scab patch so not as important as when plugging it.

 

[JCH13]

Looks good! I've been welding for 35 years, have fabbed and inspected in the aerospace industry. The berries gotta go so nobody gets hurt, but other than that buff it up

Did you use backup gas?

For the record: spatter was from the previous owner's lovely MIG welds, not mine :awe:

We decided not to back purge because the inside of the pipe was already oxidized and contaminated from being used as an exhaust pipe, it was a lap weld, and we had precious little argon with which to do the welding. I know you aerospace guys are big on back purging welds though

 

[skyking]

Yeah I edited my post. We call that a scab patch but it does not imply scabbyness.
To do backup gas properly you need a second bottle and regulator and plugs and all sorts of nonsense. Welding is not a cheap pastime.

 

[Howard]

Those familiar with the nuances of welding stainless steel know that those are generally the colors you generally want to see when you're done welding stainless, mine may be a *little* on the dark side. They indicate good gas coverage and a clean weld. A crappy/dirty/brittle weld can be buffed out to make it all nice and shiny too, and you'd never know the difference until the weld cracked.

Besides, it was my first time TIGing steel in about 2 years, so cut me some slack :awe:

A clean weld, maybe, but those colors indicate that the steel was at a very high heat in an environment containing oxygen. Pure argon does not allow for the color to change (well, barely). Structurally I don't think it means anything, but as a contact surface, the oxidized material is not as corrosion-resistant as unstained stainless.

 

[jlee]

The exhaust manifold/turbo assembly is installed - the dump fits perfectly. Most wiring is done- need to hook up power to the wideband controller and gauge, and pull the cluster again and try to reduce the backlight bleeding in around the edges of the oil pressure gauge. Once that's done, the interior can go back together!

Hopefully we're only a day or two away from a test start...

 

[jlee]

Everything fits!

 

[skyking]

Looks good for what we can see of it

 

[jlee]

lol yeah, it's pretty well buried in there.

 

[skyking]

I like my transverse cars, till I need to work at the back of them. We had an MX-6 years ago that refused to give up the alternator. It was completely disconnected but it would not emerge from that dreaded space behind the engine. I had to bend some stuff to get it out.

 

[jlee]

Wideband is done:

After I fix the backlight bleed on the oil pressure gauge, I get to put the interior back together. Many wires...

Re-clocked the turbo so the oil feed was pointing straight up- now I need to adjust the compressor housing so I can bolt the hot pipe on. Yes, that is a zip tie on the v-band clamp..and no, it's not going to stay there

 

[exdeath]

7.4 yikes I hope you change your oil every 50 miles

 

[punjabiplaya]

7.4 yikes I hope you change your oil every 50 miles

lol, jlee wanna be rich

 

[jlee]

7.4 yikes I hope you change your oil every 50 miles

Nah my oil pressure is so good it doesn't matter. :hmm:

I may try making my oil drain line tomorrow...need to figure out how I'm going to get the hot pipe to line up with the turbo - I think I need to rotate the compressor housing one step CCW so it'll line up. I'd really like to have it running by Tuesday...we'll see.

 

[exdeath]

Missing something...oh here it is

 

[punjabiplaya]

Missing something...oh here it is

with fantastic results: an mr2 shaped hole in the glass

 

[bonky]

A clean weld, maybe, but those colors indicate that the steel was at a very high heat in an environment containing oxygen. Pure argon does not allow for the color to change (well, barely). Structurally I don't think it means anything, but as a contact surface, the oxidized material is not as corrosion-resistant as unstained stainless.

@Howard
maybe zero discoloration if you weld in an argon box... the rest of us weld in a garage, with oxygen.. eventually the bead leaves the shield gas. JCH13 is Jackie Chan with a torch.:ninja:

http://www.weldingtipsandtricks.com/tig-welding-stainless-flange-video.html
"
Discoloration of stainless steel---see all the pretty colors? That usually means things are going well.
Blue, purple and straw are all normal colors on a stainless weld like this.
It&#8217;s the grey and black color that is not good.
The colors let you know that the metal has a chance to cool off enough before the argon shielding coming out of the tig cup leaves the heated stainless."


check out the end of this video:

http://www.youtube.com/watch?v=4A2tK1x1P28&feature=related

 

[jme5343]

Nice jlee! This thread makes sooo much more since I'm "in the weeds" on mine as well. Hope you get her out and have a chance to enjoy it soon!

 

[jlee]

Today was an exceptionally good day. Not only have I been up for over 24 hours and I am still awake and functional, JCH13 stopped by and we were able to get the compressor side of the turbo clocked, the oil drain line figured out, and the oil pressure gauge sender sorted as well. I've put half of the exhaust back in and am going to sit down and watch TV while I polish the rest of it to go back in tomorrow - I have a few days off, so I'm hoping to have her up and running very soon.

 

[ballmode]

did you save money doing all this yourself or would it have been easier/cheaper to buy aftermarket parts and install it yourself?

 

[FuzzyDunlop]

awesome! i want to see the results of all this work.

 

[JCH13]

Re-clocking the turbo compressor housing was... a snap. YEAHHHHH!

The turbo compressor housing attaches with a giant tapered snap ring, which makes it really convenient to clock.