aidandj

iTrader: (5)

I was kind of joking about a powerglide. Just saying there are a lot of good options that would hook up to that bellhousing.

patsmx5

iTrader: (16)

Yeah, and I may very well do that if building a 99 auto doesn't prove to work. But there's people that have put 250whp through a 20year old stock auto in a miata reliably for years, so I would think with enough parts/$$$ thrown at it, I could get one to hold twice that.

aidandj

iTrader: (5)

Has anyone blown one up that you know of?

patsmx5

iTrader: (16)

No, I haven't found anyone running a turbo on an auto that reported it slipping or failing at any point, some after years of use. Apparently turbo 300zx's ran the same auto, so they're fairly stout. And those guys have run 500-600 through them reliably with a few mods to the valve body. Hoping I can do something similar.

miata2fast

iTrader: (2)

I saw a thread where an Australian was building a high powered Miata with a Miata auto transmission just recently.

patsmx5

iTrader: (16)

If you have a link to it I would love to take a look! Not many seem to build fast auto cars in the miata world. I think it will help my consistency and ET's a lot at the track, and improve drivetrain reliability as well (assuming the auto itself is reliable).

good2go

iTrader: (2)

What about axles? Wasn't that what broke last time?

patsmx5

iTrader: (16)

Yes, it's broken an axle and the subframe. I suspect both are from shock loading due to harsh shifting with a manual and wheel hop. Axles broke on a gear change. In drag racing, a fast manual car breaks drivetrain parts a lot more than an auto as the auto shifts a lot smoother without the shock loading a manual has. I have spare diff/axles just in case, but I suspect once the auto is in I'll never break another axle.

iDizzle

I think this is the car he was talking about

https://www.miataturbo.net/build-thr...auto-nb-88990/

patsmx5

iTrader: (16)

Interesting. I had not seen that build, that's pretty sweet.

patsmx5

iTrader: (16)

Just ordered everything for an automatic conversion. Ton of parts required, not cheap. Hoping I didn't forget anything. Plan is to do get the new turbo on and working well. Then once all the auto parts arrive, and I have the time, I'll tear the car down and do the conversion. Test it with wastegate boost to make sure it works, then build the trans. I may buy another auto and build it, then swap it in, not sure yet. If I get a spare, I may try pushing a stock auto (or only slightly modded) just to see what one will take.

Hoping to get the T3 manifold heading this way tomorrow. Turbo should be here friday!

vteckiller2000

iTrader: (4)

Stock auto transmissions are often extremely capable. I ran a large turbo Volvo redblock car for a long time with over 300 whp on a stock automatic trans which is essentially a Toyota A34DL. All I did to it was lock the shift accumulators and add a trans cooler. You may have to worry about your high RPM use though. I shredded the first trans I modded by overrrev. It only liked 6000 rpm and lower. Above that and I would trash the front pump, which sucked when the powerband started at 5k and looked like this:

shuiend

iTrader: (24)

Manifold shipped out UPS today. Should be to you on Tuesday.

patsmx5

iTrader: (16)

QUOTE=vteckiller2000;1361061]Stock auto transmissions are often extremely capable. I ran a large turbo Volvo redblock car for a long time with over 300 whp on a stock automatic trans which is essentially a Toyota A34DL. All I did to it was lock the shift accumulators and add a trans cooler. You may have to worry about your high RPM use though. I shredded the first trans I modded by overrrev. It only liked 6000 rpm and lower. Above that and I would trash the front pump, which sucked when the powerband started at 5k and looked like this:

[/QUOTE]
Still doing research on this transmission, trying to figure out exactly what it is so I know what parts are available. I think it could be a 4L30E perhaps.




Sweet! Many thanks sir, I promise to put it to good use.

patsmx5

iTrader: (16)

New turbo arrived. Looks sweet! Going to tear it down, caliper everything, inspect it, debur the recirc housing on the compressor. The turbine housing on this thing is SERIOUSLY nice, not just for an ebay turbo but for anything (looking at you EFR). I'm impressed. I'll take some pics and post them once I get it measured and resassembled. Will do side by side with old turbo as well for comparison. It's bigger than old turbo for sure.

It has a polished compressor, I'm thinking about painting it. Dunno if I will or not yet.

patsmx5

iTrader: (16)

Got the new turbo apart, inspected, and reassembled. It looks pretty nice. The compressor wheel on this new turbo is a lot bigger than the old one. The old one, the center diameter was really big and blocked a lot of airflow. The new one, that part is much smaller. The turbine blades on the old turbo were thicker and blocked more air as well, blades were really thick as they get close to the center. New one looks like it will flow much better. That, and new one is much bigger.

stefanst

iTrader: (1)

That's .... quite big. (cue the "That's what she said" jokes). Seriously that thing should move some air!
What did you pay for it? A friend of mine has a 351 Windsor that needs more air and that turbo may just be the ticket....

patsmx5

iTrader: (16)

213 shipped off ebay. For a 351W you would want a larger turbo, unless you wanna run two of these on it.

I'm betting it will flow 40-50% more air than the old turbo, should make for a nice upgrade. I'm going to hook up water lines to this one and water cool it. The last one I didn't hook them up (journal bearing ebay turbo) but I'm going to do it this time, it can only help.

Mobius

iTrader: (2)

Thank you for entertaining me with miata projects I would never have considered at all, Pat.

patsmx5

iTrader: (16)

Got it. Many thanks! It looks fine, and the T3 lines up with the turbo no problem.

I don't think I'm going to port this one any. I do think I'm going to slap a coat of paint on it and the turbine/chra so it doesn't stay all rusty looking.