twin turbo???

[Maxzillian]

you would need two different turbos for this application, as once the exhaust pushes the first turbine the power is lost and the second turbine would not have the full force of the exhaust gas. It is possible though.

 

Yeah, if memory serves most systems do use a smaller second turbo. I hadn't known it was for that reason. I felt it wasn't worth mentioning the different sizes just for the sake of explanation.

 

 

For those willing to think out side the box, and not listen to the non achievers who say this or that can not be done.

 

http://www.yellowbullet.com/forum/showthread.php?t=216811&highlight=compound

 

When the turbine of the first smaller turbo reaches it set pressure ratio, large waste gates are used to bypass the exhaust flow to the second larger turbo. All the exhaust of the first goes into the second. On the compressor side the air enters the second turbo first, than goes to the smaller turbo that sees the exhaust first where the pressure is further multiplied.

 

I don't think it was ever a matter of if compounds can be done or not. It's a matter of if they are worth the complexity and cost. Personally I feel that if your goal is under 40 psi, there really isn't a need for a compound. Now with his particular setup he can certainly tune it to behave like a sequential by making sure that the wastegate on the smaller turbo is getting a reference from the intake manifold. This ensures that once the larger turbo comes online that the smaller turbo will eventually get the majority of its exhaust gases diverted and render it largely idle. This would make the larger turbo do most of the work once everything is spooled up.

 

The other way of plumbing is to reference the wastegate on the smaller turbo between the intake manifold and the outlet of the larger turbo (two port wastegate). This ensures that the smaller turbo is always attempting to pump air and makes the two turbos share the workload. Alternatively, as he had done, the wastegate reference is plumbed into the outlet of the larger turbo which according to him causes the smaller turbo to match the output of the larger. I'll admit that I'm scratching my head over that one unless he is using a two port wastegate with the other end attached to the intake manifold.

 

His particular setup is nice in that the final boost to turbine drive pressure ratio approaches very close to 1:1. However, in lower boost applications I feel that it would be better to plumb the turbos to run sequentially under the compound configuration as anything under 20 psi would certainly push most turbos to the bottom side of their efficiency maps.

[jcstarion88]

Why not go quad?

http://i15.photobucket.com/albums/a357/misterF1/DSC00479.jpg

http://img51.imageshack.us/img51/5063/img31055kl.jpg

http://img99.imageshack.us/img99/2797/img31076fn.jpg

 

Cheers.

Dude that is just beautiful, lol..

[Cole]

what about keeping the turbo, get rid of the huge ac unit and place a belt driven charger? A friend of mine has a vette and is planning on putting a belt driven charger on hers. she wants a supercharger but her husband says to get the charger.

 

Then after (i guess before would be better) change out to an mpi and get a air to water intercooler.

 

makes me want to have lots of money and time to do this and see if it works!

[polarisman14]

All superchargers are belt driven...? (Well, besides the scammy electric ones)

[The Rabbit1]

I think he meant centrifugal blower versus roots type blower

[polarisman14]

Yeah but unless its a high-rpm engine it doesn't really make sense to use a centrifugal SC since it builds boost by rpm linearly and doesn't hit full boost until redline. I had briefly considered using a centrifugal on my SQ because I used to have one on my Focus and I loved it. Yeah it doesn't make as much power most of the time and makes less torque but it is a totally different animal. Just not a good match for the G54B since it's a low-rpm engine unless you really tweak it.

[Dodge2004srt4]

I HAD plans on twin turbo charging my SRT-4 using one TD05-15g-11cm2 and one stock TD04-14g-8cm2 and possibly upgrading the TD05 to a 20g wheel at the same time. We had integrated manifolds and the turbo clamped directly to it. The way to make the twin manifold was to take 2 manifolds and combine them. The same exhaust flow spooled both turbos, and many went with the same size for each turbo. I made 420WHP and 435WTQ on my SRT running 11.5@125MPH with the twins we were looking around 600+ with larger injectors but at a cost of about $6K or more. There is a ton more room in a Conquest than an SRT-4 so twin turbo would not be a problem, you just need to do it right.

 

http://www.shophemi.com/images/PRODUCT/medium/341.jpg

 

Or with it off the engine externally gated instead of internally.

http://t1.gstatic.com/images?q=tbn:ANd9GcRGSukzspNFeH47hZ4_RGRzxqjr6kpKqFN5cPzBihzIDngCaz8L

 

Chris.

[Maxzillian]

So if I'm looking at that right, the turbos were plumbed in parallel on the exhaust side? How were they plumbed on the intake side?

[Dodge2004srt4]

So if I'm looking at that right, the turbos were plumbed in parallel on the exhaust side? How were they plumbed on the intake side?

A new "Y" is made for the existing pipe to tee them in. The intake for the original turbo stays just as it would if it were a single turbo and a new cold air or ram air intake is included for the new twin passenger turbo. Simple. You get air separately for each turbo through its own intake and filter. Its pretty cool looking but I couldnt find the pic of the first guy who had it done, it was a great pic and a sharp engine bay. Still miss my SRT but I have alot of fun in different ways in the SQ.

 

Chris.

[The Rabbit1]

Yeah but unless its a high-rpm engine it doesn't really make sense to use a centrifugal SC since it builds boost by rpm linearly and doesn't hit full boost until redline. I had briefly considered using a centrifugal on my SQ because I used to have one on my Focus and I loved it. Yeah it doesn't make as much power most of the time and makes less torque but it is a totally different animal. Just not a good match for the G54B since it's a low-rpm engine unless you really tweak it.

change the pulley?

[Blue]

change the pulley?

My thoughts exactly.

[Metric-man]

I HAD plans on twin turbo charging my SRT-4 using one TD05-15g-11cm2 and one stock TD04-14g-8cm2 and possibly upgrading the TD05 to a 20g wheel at the same time. We had integrated manifolds and the turbo clamped directly to it. The way to make the twin manifold was to take 2 manifolds and combine them. The same exhaust flow spooled both turbos, and many went with the same size for each turbo. I made 420WHP and 435WTQ on my SRT running 11.5@125MPH with the twins we were looking around 600+ with larger injectors but at a cost of about $6K or more. There is a ton more room in a Conquest than an SRT-4 so twin turbo would not be a problem, you just need to do it right.

 

http://www.shophemi.com/images/PRODUCT/medium/341.jpg

 

Or with it off the engine externally gated instead of internally.

http://t1.gstatic.com/images?q=tbn:ANd9GcRGSukzspNFeH47hZ4_RGRzxqjr6kpKqFN5cPzBihzIDngCaz8L

 

Chris.

 

 

http://www.mazdaspeedy.com/2011/02/18-litre-4-cyl-16v-twinsequential-turbo.html

 

http://www.car-net.jp/rotary/data/turbo

[polarisman14]

change the pulley?

 

Still doesn't make it make peak boost before redline, or solve the issue of the car being a lower-rpm torque motor. The boost will help balance it but as we all know with the turbo it falls on its face on higher rpms.

[The Rabbit1]

Still doesn't make it make peak boost before redline, or solve the issue of the car being a lower-rpm torque motor. The boost will help balance it but as we all know with the turbo it falls on its face on higher rpms.

I failed to see what your trying to say, possibly because it doesn't make sense to me. centrifugal blowers can spin plenty fast and create no restriction on top end. You can change the pulley to change the amount of boost: http://www.motorator.com/videos/195

Edited June 7, 2011 by The Rabbit1

[Cloud81918]

In Saturn world we had a guy build a twin Turbo 1.9 with two turbos off of 2 Thunderbird Turbo coupes. It didn't make great numbers, but it was cool. It sounded awesome too. Sometimes cool is better than performance.

[Blue]

In Saturn world we had a guy build a twin Turbo 1.9 with two turbos off of 2 Thunderbird Turbo coupes. It didn't make great numbers, but it was cool. It sounded awesome too. Sometimes cool is better than performance.

Which Saturn forum was that?? I remember seeing pics on sixthsphere, but never did find the thread.

[Cloud81918]

Which Saturn forum was that?? I remember seeing pics on sixthsphere, but never did find the thread.

 

 

I believe there were posts on both Sixthsphere and Saturnfans. The build was years ago. It was pretty cool looking.

Edited June 7, 2011 by Cloud81918

[Blue]

I believe there were posts on both Sixthsphere and Saturnfans. The build was years ago. It was pretty cool looking.

F*** Saturnfans.

I miss Sixthsphere though.

[Dodge2004srt4]

You know you could always add a turbo to the exhaust instead of the muffler, Ive seen that done, and it just requires some fabrication for mounting it, running oil lines, and the charge pipe. Then no one would even know without looking under. Ive seen single turbo setups like this spool about the same as a typical turbo setup even with all the extra charge pipe. Its also easier than adapting something or welding the crap out of the manifolds. Just drill a hole in a charge pipe and run it back. Add an oil line. Mount the turbo, and your done. Of course the MAF may freak a little, but its do-able.

 

Chris.

[89PalermoSHP]

Screw twin and go quad. One for each cylinder! Have some custom made 2mm undersized valves and that thing would rip.

[Blue]

Screw twin and go quad. One for each cylinder! Have some custom made 2mm undersized valves and that thing would rip.

[89PalermoSHP]

 

[polarisman14]

You know you could always add a turbo to the exhaust instead of the muffler, Ive seen that done, and it just requires some fabrication for mounting it, running oil lines, and the charge pipe. Then no one would even know without looking under. Ive seen single turbo setups like this spool about the same as a typical turbo setup even with all the extra charge pipe. Its also easier than adapting something or welding the crap out of the manifolds. Just drill a hole in a charge pipe and run it back. Add an oil line. Mount the turbo, and your done. Of course the MAF may freak a little, but its do-able.

 

Chris.

 

I had one of these on my last car and it does NOT spool as fast as a manifold-mount turbo. This was with the whole exhaust heat-wrapped to keep as much volume in the exhaust as possible and as little restrictions elsewhere. The gases just don't stay hot enough/expanded enough to do it.

 

Still sounds like pure sex though.

[The Rabbit1]

I had one of these on my last car and it does NOT spool as fast as a manifold-mount turbo. This was with the whole exhaust heat-wrapped to keep as much volume in the exhaust as possible and as little restrictions elsewhere. The gases just don't stay hot enough/expanded enough to do it.

 

Still sounds like pure sex though.

http://rsxisfaster.files.wordpress.com/2007/05/maxelladvtec.jpg?w=450

[Cloud81918]

F*** Saturnfans.

I miss Sixthsphere though.

 

 

Meh, never got involved with that war. I don't think forum wars make much sense.