Hi guys, I have a interesting myth for the 300ZX that is running them with 2x different sized turbo and use a big balance tube in between the cooler piping. so I can have a GTRS Turbine running a 45mm comp on driver side and same turbine with a 71mm comp on passenger side. Both turbos will be running on the exact same A/R housings. Idea is the Driver side spools up first for good down low and Passenger side comes in later for 4500RPM+ assume that I make a valve to stop boost escaping through the bigger turbo. Would this myth work? or have any one tried it in the past? any valuable inputs would be appreciated.
Your talking sequential turbo's and it's not as simple as all that. In fact it's not an easy job at all on a "V" motor at all as you want the gases that go thruogh the wastegate on the smaller turbo to feed into the bigger turbo on the other bank, other wise your still only using 1.5L to spool a huge turbo. Only really something to consider on a straight motor.
sure. quad turbo system would work on a V shaped motor.. 2 different sized turbos hahahhaha .. seriously ... i dare you to try it
Lets call Turbo A Small turbo and Turbo B bigger turbo. Sounds funny but In Theory it should work. All you need is a big balance pipe with a valve on TurboB side that only opens when its making boost. So TurboA support boost to both throttle bodies through balance pipe on low RPMs as it will spool lot faster with smaller comp wheel. It still remains 3cyc per turbo, and they run their separated exhausts. The main issue that bothers me is if higher boost from TurboA would cancel out lower boost from TurboB and escape from TurboB once control valve opens.
Yeah, we get what your alluding to, but it doesn't really work on a v motor. Your using an undersized turbo to capacity ratio and an oversized turbo to capacity ratio, your going to have a massive flatspot in the midrange.
That is what happens in a Supra. Which one turbo is shut completely while the other turbo is running. In this case both turbos are spinning. TurboA only support till about 4000RPM while analog valve opens with TurboB at 3psi and from that point Both turbos compresses air together till TurboA's surge point (Around 20psi). So I don't think there is a flat spot. The other theory is while TurboB is forced spinning, for TurboA's boost pressure to escape through turbo B it needs massive amount of energy to overcome TurboB's compressor and turbine pressure plus the momentum in the spinning mass. Which its very unlikely to happen on a 3cyc 1.5L at 4000RPM. Or is it?
wouldn't even attempt it vg30dett is a balanced V motor (2 x1.5 litre engines) relying on a balance pipe to do what you want will be a disaster sign up here http://www.supraforums.com.au/
Sequential turbo's on a straight motor vs a bent motor is entirely differnet, the amount of exhaust plumbing to get a similar setup on a V motor makes it pointless. You don't just have a small one on one bank and a big one on the other, you need to route the waste gases from the small ones wastegate to the other manifold to give adequate flow to spool a large enough turbo to make it worthwhile. Your on the right track, but you need to take that model, and double it for a V motor, ie 2 turbo's on each bank, and 1.5L / bank isn't enough.
Its not a quad turbo setup. Its still a twin setup except one side turbo is bigger then the other but they all run off the exact same turbine wheel and housings. If that myth works it would get rid of the Lag issue with high powered Zs while still remains in a twin setup.
Mate, everyone realises your not talking about a quad turbo setup, we all realise that you want to have 2 different sized turbo's to create boost over the whole rev range but your idea is flawed. The reason it works on the supra is because it's a straight 6 so you can have the capacity of the motor spooling both turbo's. It won't work on a V motor the way your suggesting, even having two of the same sized turbo's on a V motor can cause problems if the wastegate is opening on one sooner than the other. Read the posts above more carefully
would love to see your EGTS drivers side 500c passenger side 1800c wonder how long the motor will last
Give the bloke a break. If it wasn't for inquisitive minds, there would be no new innovation in the world. Then who would you buy your fancy turbos off eh??? For the record, Porsche did this back in 1986 with the porsche 959. Although its a flat 6, it can be done, but lots of pipe work and valving to get it to work together. Pretty mean looking car this turbo setup was in too...
Near the first thing a serious supra owner will do is piss of the sequential setup, and install one big MF turbo, and that is a step forward for them. Putting sequential setup on a zed is a step backward for the reasons mentioned. You could spend quite a bit a money on something like this, for no gain at all.
It will work, the only benefit I see will be very little lag, it is unlikely you could fit a turbo large enough in the stock location to create enough flow and hence high hp. It will be a very strong performer from down low to midrange then drop off significantley in the top end.
if you had the exhaust gases from each bank going into a common manifold where both your turbos (1xsmall and 1xbig) and had them powering the intake plumbing then it would work the same setup as the supra, being that the whole 3litres are powering both turbos, instead of relying on a single 1.5l bank powering an individual turbo.... would be some crazy plumbing to achieve this and i don't think there'd be enough room to pull it off. I like this thought though. But in saying that, while your doing common manifold plumbing, why not just make a single huge-mofo turbo setup - like the Supra guys do anyway....?
I saw a red one of these in Redfern yesterday... akin to seeing Jen Hawkins in Aldi :drool::bow2::cool2:
There's a red replica built of a 993 carerra which is going around sydney, very well made replica, but with out the "supercar" go. Not many real 959's in Australia, and most are in collectors garages. I dare say in Redfern you saw the replica
Agreed. No matter what you balance it out with the strain on equally opposing sides of the Engine would be different throughout the power range. One side would be dragging at lower RPM's and the other side would be lagging at Higher RPM's. this would cause the whole system to be unbalanced. Sure it would work. Just not optimally. Think of it as putting 2 different sizes of exhaust on the car. Or two different size intakes from side to side. Sure it will work but the Engine will be fighting itself. Personally I think it would be like the one-legged guy in an @$$ kicking contest. Or a bunch of retards in a round room full of bouncy balls.
