twin turbo set up

[25psi_talon]

ok me and my friend just bought a twin turbo kit and we plan on building a 94 or a 91 talon with that in there, the only thing is, we were wondering what size of injectors we should use, how big of an intercooler we should get and the recomended bov (must be bolt on), price really isnt a factor right now, but we would like something not to expensive tho but will last us, other wise we have 2 big 16g turbo's, custom mani and stuff like that but here is a video of us testing them.... http://www.youtube.com/watch?v=2DEqb9eJQrI

 

[gingerbredman00]

It says the video you have requested is not available

 

[jstgon]

Your video does not work. I believe this has been debated before, and it is proven that a single turbo is better for your cars, unless you are running a compound setup. Thanks to 99gst_racer (not sure if that is his correct name on here). But good luck, would like to see more information on this subject.

 

[25psi_talon]

well the video isnt done being processed but here are some pics,

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[abaum565]

those look like t25's or t28's to me??? And I am not sure about the wastegate setup you have there. Seems to me like boost creep is in your future.

Even still, it seems clever if executed correctly. Not sure if each turbo will hit the lbs/min they are capable of with only 2 cylinders, but I will be interested to see the results and logs.

 

[spoonman]

That is a parallel turbo set up. It its often advised to only have one turbocharger per cylinder bank. Why? because of room in the engine bay, radiates/loses to much heat energy, extra weight, and requires sophisticated (complicated) exhaust/charge plumbing. The advantages to using two small turbochargers instead of one large turbo is the spool up of two small turbos can be faster than one large turbo designed to flow the same amount of air, because the turbine/compressor wheels are both lighter and will accelerate quicker (this does not always happen though). The only other advantage is that the two turbine housings could lower the amount of exhaust pressure inside of the manifold by flowing more exhaust through the manifold/turbocharger. This can be optained with a larger turbine housing or just a exhaust manifold with more volume. Turbos aside you always want the lowest pressure possible on the exhaust side of the engine, Why? it deceases the engine's pumping losses and makes the engine more efficient, but the pressure is necessary to rotate the turbine.

One thing to note is that the turbochargers are are paired with the exhaust ports 1/4 and 2/3. This is notable because the cylinders that are paired together fire at the same time. This means that there will be large pulses of exhaust with pockets of vacuum in between (instead of smaller pulses with smaller pockets of vacuum). The problem with this is that the turbo will not like these large separated pulses going into the turbine and will actually make it less efficient. But then again with turbocharged engines the exhaust pressure is much higher than in a N/A engine and the pulses will start to collide when the RPM's/exhaust pressure rises and make the scavenging/ pulsing less effective but not obsolete.


Interesting but most will tell you that is is not worth it to have two turbos, but they are just Haters.

 

[AWDnoobie]

Not sure how much my info will help ya... But darrel coxx racing did a srt4 with twins, called the HotRod. try looking up on that one and see if there is anything you can get for info, there should be a few youtube and streetfire vids of it.

 

[agentorange313]

this has been debated and also done before on these forums. I am sure if you type in twin turbo int the search engine you will come up with a lot of threads.

http://www.dsmtuners.com/forums/hangout/880-twin-turbo-merged-11-6-a.html

http://www.dsmtuners.com/forums/tur...uential-parallel-twin-turbo-evo3-16g-car.html


I think that a single turbo for our engines is much more efficient and cost effective.

 

[dsm-onster]

Tell that to Paul Volt (99gstracer)

Bottem line. 2 t25s parallel (sequential) equals 54lb/min potential flow. . . Sounds cool.

 

[romeen]

In the video, as far as I could tell it looks like you were spinning the turbos without an oil supply/oil pressure in the CHRA (maybe I'm wrong). If so, aren't you concerned about damage?

Nonetheless, this is interesting. Whoever made that manifold did a nice job. I look forward to seeing the results.

 

[GooeyGus]

Your smoke detector needs a new battery

So is spooling up turbo's like that, even if it is only with a vacuum, bad for them since there is no oil?

EDIT: ^^ He beat me to it.

 

[25psi_talon]

its a vacume and we didnt run it that long, so the power of the vacumes wasnt that powerful but u guys will understand y i bought these, i got this for $250 so im going to make it work but i have somwhat of a problem, i have a 94 with a good motor (nt) and a 91 tsi that has a blown motor but we mainly have the parts we need, the other thing is i have a 94 tsi awd with a stock motor and mint body but is auto for 500 so i dnt kno what one to do yet

 

[romeen]

Actually, considering there was no oil supply you were spinning those for quite awhile. The shafts are most likely scored considerably.

Anyway, $250 for that setup sounds like a steal. As mentioned earlier, those look to be either a T25 or T28 as opposed to 16G's. That would be better anyway as they will be easier to spool on the relatively low volume of exhaust flow from 2 cylinders.