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A turbo question...
https://cimg3.ibsrv.net/gimg/www.rx7...625efafcee.png
I'm piecing together a 12a dellorto low boost (5-8lbs) for my 1980 626. I have a rotary works 12a exhaust manifold and tial 44mm external wastegate. I need to make a decision on a turbo. Here is what I'm looking at: Goals are a fun car. No drag racing or competition. 12a is stock port and I won't be running an intercooler. Thoughts? |
https://cimg8.ibsrv.net/gimg/www.rx7...ce549cc210.jpgSomething like this. Waiting on turbo hat for the dellorto
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I would say your best bet is to go with a turbo the same as a turbo II fc or the same as a race tech kit from the 80s if you want a fun ,fast and street friendly car . I would also not be afraid to throw 15lb at the 12a .
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Thanks Matt. Problem is I already ponied up for the fancy manifold. I have an fc t2 turbo and manifold but would have to modify heavy to work on the 12a
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What about one of these?? Cheaper, current aero, good turbine options... 57mm Enhanced S200SX-E 7670 Turbo ? Full Race
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You'll need to start by plotting your engine's operating points on the compressor map you intend to use to see if it's a close enough match.
Info on how to do that: https://turbobygarrett.com/turbobyga...Tech%20103.pdf T04E "57 trim" map: COMPRESSOR MAPS S200SX-E map: http://www.jegs.com/images/photos/10...19turbomap.jpg P.S.-What do you have planned for ignition timing control? |
Locked dizzy with leading timing at 10-12 degrees adv. trailing at 0
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Originally Posted by 13BT_RX3
(Post 12128386)
You'll need to start my plotting your engine's operating points on the compressor map you intend to use to see if it's a close enough match.
Info on how to do that: https://turbobygarrett.com/turbobyga...Tech%20103.pdf T04E "57 trim" map: COMPRESSOR MAPS S200SX-E map: http://www.jegs.com/images/photos/10...19turbomap.jpg P.S.-What do you have planned for ignition timing control? |
there are adapters for t3 to t4 mounting on e bay and i think ace race stainless has them
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Originally Posted by cfamilyfix
(Post 12128406)
Locked dizzy with leading timing at 10-12 degrees adv. trailing at 0
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Originally Posted by 13BT_RX3
(Post 12128451)
Taking the centrifugal advance springs out should work fine, that's what I did for my blow through setup a while back. You may want to see if you can find a JDM 12A turbo dizzy. It's all setup by Mazda to work with boost.
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Semi-locked is the way to go. Or in other words, just limit the advance to 10 degrees.
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Redirection was necessary and steps have been taken
https://cimg9.ibsrv.net/gimg/www.rx7...c8bc902d2b.jpgI figured timing was critical and since oem pulleys are notoriously variable I got this https://cimg1.ibsrv.net/gimg/www.rx7...01d90c9417.jpgFound some rot to be dealt with so this had to happen https://cimg2.ibsrv.net/gimg/www.rx7...33603081cc.jpgGot an rx2 manifold and a s4 turbo with 12a fitment https://cimg3.ibsrv.net/gimg/www.rx7...f22d06b87b.jpgSome time with a grinder and some high temp paint will go a long way toward making this look presentable https://cimg5.ibsrv.net/gimg/www.rx7...38c7c903d8.jpgTurbo that came with the manifold is seized but I have another. https://cimg6.ibsrv.net/gimg/www.rx7...e02981708c.jpgJeff20b might have had something to do with recent decisions lol 😂 |
Much better solution!
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cutting the stock fc turbo manifold only involes enlongating the holes like 5mm, its really easy... but looks like you found a solution.
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Do you know if that RB pulley has 100% accurate marks? It should as they base it on the woodruf key. Might want to double check it though.
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Originally Posted by Jeff20B
(Post 12129599)
Semi-locked is the way to go. Or in other words, just limit the advance to 10 degrees.
Looks like an effective solution. |
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