southern_info

iTrader: (3)

If you had the money to invest into your car as far as reinforcing the motor and making it as strong as it could be. Then you have the option of putting single or twin turbo on the car. The car would be a daily driver but can preform on the dragway. Which would you decide on buying and why? What would be the advantages of one over the other? All opinions are welcome TIA!

Brandon@Forged

Twin Turbo, simply because you have two turbo's with ~450hp limits on each one, more room for horsepower, and you won't have to be pushing them to the limit to make the goal you want (depending on your goal, if it's 650 or over...single most likely isn't for you). Just wondering, are you wanting some opinions on internals and transmission also?

southern_info

iTrader: (3)

What factors could set in if you did max out a single turbo? What's the biggests single turbo you could fit in a 350z and what kind of hp numbers would it dump. Why is it that toyota supras are converting from twins to single turbo? <~~intriguing

Brandon@Forged

MK4 Supra's are using bigger single turbo's, it's not as easy to fit a big turbo like they are using in a 350Z engine bay. I don't think a Single T88 would fit . I would like to see someone come up with a T51 or something similar to that size if it could be fit into the engine bay. No clue what would happen to the turbo, maybe the turbine wheel or centrical shaft might break, i'm not positive though. Turbonetic's and APS' Single Turbo Limits are rated at a 650hp limit.

Tony@Performance

iTrader: (16)

If you are building the motor properly to handle high power, single turbo is the only way to go. The bigger turbos that the turbonetics turbo kit run for example are very efficient at higher boost levels. They flow much better than two smaller turbos. It is easier to tune one turbo than two. however you will also be in the rut of having a little more turbo lag, BUT, there are ways to get around this. Such as getting a very light flywheel/clutch to help get the motor's RPMs up quicker, that would help greatly. also, pulleys would help too. Twin turbos are good, but to a point. If skys the limit for your buildup, single turbo is the way to go.

IF you are not planning on going to extremes, then twin turbos will do just fine. And wil be very fast. But two smaller turbos will only get you so far.

Now as for supras, the reason they go with one single turbo for big HP numbers is efficiency, because they use a sequential turbo setup, where one turbo is smaller than the other. This helps reduce turbo lag and helps to spool up the larger turbo, which takes over the efficiency after the smaller turbo has reached it's limits. This is not a setup that you would run on a V-6 style engine, it would be veyr very hard to get all the piping set up and enough room for the two turbos to fit, and work toegether etc... On an inline 6, it's no trouble. But take a look at the GMC scyclones etc... the way they tune their buildups is similar to that of mitsubishis as well as supras when it comes to the turbo upgrades. Eventually, when you hit a certain tuning limit of two smaller turbos, the next logical step will be one larger one.

southern_info

iTrader: (3)

Thanks for yall's input. Single turbo is gonna be the way I'm going real soon then.

AxionF117

The turbos are not different sizes, but rather sequential turbos means this, take the supra for example it has 2 turbos, one of which is always spooling up at low rpms (turbo #1), after around 4k rpms the second turbo kicks in, this is when the car really starts to make power. You can also run the supra in TTC mode in which both turbos spool up at the same time (more lag). The turbos are the same size in the mkiv supra.

Aftermarket twins for the supra are mostly done for show. LArge singles in the supra world dominate the dyno's and drag strips.

Sharif@Forged

iTrader: (92)

There is totally false on the VQ motor....

First, no matter how you slice it, a twin setup is going to provide more power, less turbo lag, and more efficiency, simple becuase we are a V6 motor, and the turbos needs to be bolted directly to the exhuast manifold, and as close to the head as possible. This provides optimum exhuast scavanging, and keeps exhuast temps high as they race through the exhuast housing of the turbo. So for the 350Z application, the twin turbo will provide for higher peak output, and then the single kits that APS and Turbonetics are working on . The Greddy TT kit is good for 700whp and beyond with a built motor and lots of other mods. The Greddy turbos dont even reach peak efficiency until 22psi....based on the compressor maps, and the RPM that our car's produce.

With the Supra, they come from the factory with two relatively small turbos, and they are sequential. A sequential setup typically does not yeild as much power, so when they swap it...they go with one larger turbo.

What are are saying makes some sense on other cars, but not on the 350Z.

thunder0880

iTrader: (10)

i agree, gq626, anyways the supra motor is inline unlike ours which is the V, thats why it goes better with a single turbo.

sleeper

I think that a twin kit is more logical for the 350z because of the engine configuration V series not inline. Dont get me wrong I love my T66 single turbo Supra, but clearence for a decent sized turbo would probably be a problem on the 350z.