Twin turbo? [Merged 11-6]

[c_riggan]

In my opinion, twin turbos on any four cylinder is just rediculous. I just can not imagine twins running very well on 4 cylinders only. I think they belong on Vs and Inline 6s only. But, to each thier own.. and props for giving it a try, I just dont think it would be as rewarding as the money spent suggests.

 

[forcefed4]

well, he may have mistaken twin scroll for twin turbo?

I'm guessing the same. Someone doesn't know much about his car...

It could be done, but with a stock intercooler and no gauges, It's not likely that it is done on that car.

 

[16g-2ndgen]

my moms focus is twin turbo, dual t3/t4's with dual twin intercoolarz. see i can say that too. I personally doubt that guy has a twin turbo evo, and hes just messing with you.

 

[Steelnation36]

I have seen a lot of twin turbo cars but i have yet to see a evo with twin turbo. And as everyone says anythings possible but you have to decide if the cost is worth the results. Which in this case it would not be

 

[JFatch1890]

Anyone have any pros and cons about this set up?Just looking for input on it.I think it would be sick to drop a twin turbo in a 1g awd.But this setup i think looks a little to simple.It says its for a 2g or 1g but pondering it says fitting this thing would be a pain for a street car without cutting the front end to get the full setup in.


<a href="http://s265.photobucket.com/albums/ii221/killaxman2o/?action=view&current=twinturbosetup.jpg" target="_blank"><img src="http://i265.photobucket.com/albums/ii221/killaxman2o/twinturbosetup.jpg" border="0" alt="Photobucket"></a>

 

[deflator]

Looks like you'd need to cut out the metal under the filter and run without fans. Is this supposed to be a compound setup?

 

[spoonman]

Very nice picture.

The idea of having the second turbo being fed the exhaust gas from the first looks like an inefficent idea at first, then I figured that because you are not splitting the cylinders so that two cylinders power one turbo and the other two cylinder power the other, the first turbo will spool as fast as just having one turbocharger because the amount of exhaust flow would not change. With both turbos you also have the possibility to run twice as many CFM's as having one turbo. I do believe though that the exhaust would have higher back pressure at higher RPM's due to the extra restriction.

 

[1gDSM4g63]

Is this just for the fun of it? In no way could I see how this would be beneficial power wise if it you did get it to work. I mean after the first turbo there would be tremendous back pressure and the second turbo would still lag. You might want to think about this, there is a reason why people go to a high flow cat or a test pipe to relieve the back pressure. Also I don't think the second turbo will last that long taking on immense heat from the first turbo.

If you want power just go to a big turbo with twin scroll housing and a manifold.

 

[My1GLaser]

There is a guy on the DSMLink forums doing this right now. There is a lot of math calculations to back up why it will work well. He will have results in the Spring, but a lot of the big dogs on the forum believe that it will work. I am not going to make a feeble attempt at explaining why. I have been on that forum for a while and some of those guys just know their sh_t.

 

[erald01]

Thats the sequantial turbo set up and for 4-cyl is not that efficient. Supras,rx-7 and skylines use that kind of set up but i think they split them 3 and 3 for the inline 6.

 

[Jeff@Slowboy]

I would think the heat alone produced by all that exhaust piping in the engine bay would make this a no-brainer to stick with a single turbo. Yes it looks cool and exotic, but I can't see it being efficient enough for the hassle.


In short, The juice is not worth the squeeze.

Oliver
[email protected]

 

[JFatch1890]

Yeah i wasn't looking to do it.I just seen the set up and was wondering how the setup would benefit in anyway.I like the simple 1 turbo set up rather then twin set ups anyways.I just wanted to see if i was missing something that would even make this sense able to do.If it was beneficial then it would be a simple fabrication setup that i would of maybe considered for a project but seems like i was correct when i annualized it and didn't see no real (huge)benefit.Just thought id get some input.Thanks guys

 

[My1GLaser]

I didn't look closely enough to the pic.

The guy on Link is building a compound setup. The compressor outlet of turbo 1 feeds into the compressor inlet of turbo 2. Basically, the second turbo is compressing compressed air and moves quite a bit more air compared to compressing just atmospheric pressure. Plus the first turbo is the smaller one and you get quick spool and large airflow with one setup. I think he is running a 16g and 35r. Yes it seems like the first one would be a restriction, but a lot of the exhaust is getting wastegated thru a Tial 44mm and fed into the turbine inlet of the second. So you are not limited to the 7cm exhaust housing flow of the 16g.

 

[HIGHPSI4]

I'm afraid that in this set up the first turbo is going to pull a lot of the exhaust energy by the time the exhaust gases get to the second turbo. At this point there will not be enough energy to spin the second turbo. This will cause the second turbo to be a restriction. Just my $0.02. I really hope it works. Good luck.

 

[Stapl3]

Yes it seems like the first one would be a restriction, but a lot of the exhaust is getting wastegated thru a Tial 44mm and fed into the turbine inlet of the second. So you are not limited to the 7cm exhaust housing flow of the 16g.

Didn't someone on this forum already try a twin turbo setup like this? The second turbo was fed off the first's wastegated exhaust from two wastegates. Something like that, I remember it not working out so well.

I've always like the idea of small twins. I remember reading of someone using two t25's and getting faster spool than a 20g with equal pull or something. This was with each turbo using 2 runners though, not compound.

Either way, I'm down for trying new stuff like this.

 

[viperlp01]

Well i don't think you have heard of a mod on here that is doing a setup kind of like this. I won't release his name because he is keeping it in a local forum. His calculations are at about 42 psi at about 2-2.25k. It is more of a sequential set up that on turbo feeds the other turbos inlet... You might see it in the summer... Sounds sick... turbos are a 16g and a turbonetics 60:1

 

[pboglio]

Compressor output of the 2nd turbo should be feeding the compressor inlet of the 1st turbo (the turbo attached to the exhaust manifold) if the aim is compound turbocharging.

 

[stockfornow]

This has all been said, but I'll say it again. This is the sequantial setup, just like in the RX-7, but not like the supras/skylines which feed all 6 cylinders into 1 turbo at low rpms, and then split 3 cyl. per turbo (both turbos however are the same size).
Also, isn't the guy on DSMLink forums is doing this, but wasn't he doing the compound setup?

P.S. I lost the link to it, so if anybody can pm me the link to that thread, I would appreciate it.

Another guy, I believe Wort_dog, had this done with twin 16g's. But he didn't get the 2nd turbo to spooled up until like 7K... I asked him if he was recycling the WG (from the 1st turbo into the 2nd one), but he never replyed, so it could be that he was just wasting the exhaust from the WG... I hope it makes any sense... Anyway, he also mentioned that when the 2nd turbo spooled up, there was a surge, so it has to be controlled somehow, would one other problem. But it did work, just not efficiently enough for him. So, who knows, maybe if it's done right, it could be like a 600 ponies and like 700 torque....

 

[viperlp01]

nope 16g is on the mani and the big one is up above it. BTW the hole setup is already on the car. It just needs a new 16g. wastegates do recirc back into the setup

 

[z24frank]

Would a small sidemount be sufficient and not get heat soaked?

 

[JusMX141]

I'd lose the intercooler altogether and go full Meth Injection like the big boys.

 

[interex]

I personally don't see a point in this. You won't be able to run two large turbos with that setup and make any more noticable power than just using a large turbo to the begin with.

 

[ed_GST]

ams did a twin turbo setup on their evo

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AMS did it
they had problems tuning it because the valves didn't opened quick enough
AMS Custom Staged Turbo System using a GT42R and GT28RS

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http://amsracingblog.com/?paged=2

 

[viperlp01]

His don;t look like that. I thought they were going to run this setup for the meet but decided to go with a 42r due to tuning problems

 

[dnhieu]

this has already been tried by the evo crew in a competition to get the highest hp out of a 4 cylinder possible. they ditched the 1st turbo to go with 1 42r to win the competition...