i was reading on aaron cake about the twin scroll setup. now my qustion is if i add an after market t60-1 alone with the apexi stand alone with the twin scroll still operate normally ?

 

Why?
Going with an aftermarket turbo will usually mean you need to chuck that piece of crap stock turbo exhaust manifold.


-Ted

 

I haven't seen many aftermarket turbo's that are twin scroll. They are out there, but they are very expensive usually $1,000 or do.

I have heard it said that with an equal length runner exhaust manifold the benefits of twin scroll are outweighed in a piston engine. I don't believe this is the case with a rotary however because there are only two runners total instead of 4. The effect of exhaust gasses mixing in the neighboring runner will be increased because there are only two runners. This may be why Mazda put the twin scroll on in the first place. But also at the same time the stock turbo doesn't have ball bearings and a ball bearing turbo is going to spool faster because of that. So who knows if it really matters?

 

so the Answer to your question.... it would not operate with a stand alone computer. I have a BNR stage three take the twin scroll out it hampers performance a lil if you leave it in i speak from experience.

 

Why doesn't the twin scroll work on an aftermarket computer? It seems like it should be one of those mechanical things that doesn't effect the computer.

 

that's what i was thinking it was all mechanical and the turbo that i was looking at buying is a ball-bearing and i found an after market header that has interchangeable wastegate features on it you can fit anywhere from 38 to 50 on it. at least i think it was 50. any way from reading i'm ***-u-me-ing that the set up ( along with a down pipe, and 3in cat back ) will out perform the mazda twin scroll ??

 

The twin scroll wouldn't work on an aftermarket computer because the solenoid that was triggered by the stock ECU will not be getting any signal.....

Its possible that you could rig up a Haltech's aux. output with an RPM trigger to run the twin scroll though.....but Im not sure about other EMS's

NOW...

ummmm......YEAH??!?!!

Of course an aftermarket ballbearing turbo of a larger frame with an aftermarket manifold and exhaust is going to outperform the 20year solid bearing HT-18

 

I need to be in the second gen section more often.. Too much fun!

 

i'm going to hijack my own forum for a minute... did the turbo II's come aws like the 300zx and vr4 ??

 

They had a passive system called DTSS.

 

but if i switch out the ecu it would still work right ?? because its mechanicaly controlled correct ??

i'm just trying to lean as much as i can before buyin one.

 

What an odd sentence...

Short answer is no. Your afermarket turbo will not fit the stock manifold so you can't use the twin scroll stuff unless you retrofit it onto the new manifold. And I'm not sure why you would do that either...

 

oh dont worry i dont plan to i'm just trying to see how it all works. i found a header that will fit the turbo i plan to use so there will be no "retrofit" as you put it.

 

Nice, is it a block hugger header?

 

Yep, its passive.

 

You've just completely contradicted yourself...

Yes it can work with another ECU, but no it's not mechanically controlled or "passive". It requires an ECU-controlled solenoid valve and a check valve to work, just like it has stock. Without them the system will do nothing useful.

Any decent aftermarket ECU can control the twin-scroll system. The solenoid valve is switched at a set rpm, that's it. It would be wired up exactly like it was stock. Very easy.

 

OMG thank you for clarifying this it seems that learning can be a difficult process for some.

The s5 never had twin scroll mazda just used a better manifold in which case you should do the same.

 

More comments on the twin scroll to come two years from now. Standby.

So. You can read on Aaron Cake. As in sit on top of him and read a book? Or does he have words engraved in his skin?

 

no there tated on

 

and yes it is a difficult process for one.. congrats on finding a post i made about a'billion years ago when i knew pretty much dick about the fc.... i sir applode you

 

wtf?

 

I think I'll just close the thread...