a single kit in a 300zx tt is one hell of a job. but can easily hit 11's on stock turbos so i dunno where that came from. jwt pop chargers, ecu and exhuast you will be into low 12's high 11's definetly

 

uhhh ok.....

 

im not sure how easy it is but these guys do this for a living, they own the performance shop and have some serious cars there.

 

There really is not a significant difference between the spool or power potential of a properly sized twin setup compared to a properly sized single setup (assuming no asshatery on the obvious differing piping requirements).

You have the same exhaust energy and the same engine flow requirements in either case...

For a Maxima, the engine layout is vastly more condusive to a single. Thus, this is the logical fabrication route.

Deviate from this at your own expense.

However, if you still feel that you want to be different and go twin (it CAN be done afterall), then please detail your build for our viewing pleasure.

Good luck.

 

who what where!

 

i see much confusion in this thread. firstly, a twin turbo setup in the maxima will only be effective with smaller turbos (such as the t22's). the turbos he wants to use are effecient to 18/19 psi and can support well into the 400whp range. the difference between a twin setup and a single setup is lag, i could explain but you can just read what i and others posted 2 years ago about this very subject (and the prospect of installing t22s in a maxima): http://forums.maxima.org/showthread.php?t=328107

ptownmax, you cannot use the z turbos as sequential, they are designed (as is the motor) to work symmetrically as a parallel setup. a v-motor is not engineered the same as an i-motor, thus the systems used on both have various strengths and weaknesses accordingly. you must feed off of each cylinder bank independantly if you want to use these t22's, feeding 3 liters of air through one and then the other (as you would in a sequential setup) would cause immense backpressure and incredibly ineffecient preformance with boost spikes that would make your bones chill.

as for z32's being faster as single turbo, that is only in a straight line without allowing the turbo to unspool. coming out of a corner the twin turbo setup will always be faster because the torque curve is far more linear and the spool-up time reduced.

on the side, not with intention to kill this guys thread, look forward to seeing mine completed before we get too far into june. i finally got the funds to purchase the last of my parts requirements and fabrication will begin as soon as next week. i will try and document as much as i can but ive intended to document alot of the cars i did crazy stuff on and we just never stop to take more than the first five pictures or so...

 

What do you base this on?

 

That's what I'm wondering about. On a symmetrical setup, you're using what should be half the size of turbo and only using half the engine. Thus common sense says lag and power should be roughly the same.

 

i can agree with this because thats how the factory set up works. the first smaller turbo is instant reaction without lag, thus spooling up quicker at lower rpms then the bigger one kicking in for higher speeds. i think on a larger single turbo you have lag at lower rpms but once it kicks in it has much more power then the stock turbos.

 

its simple, it revolves around resistance, time, and flow. first, all turbos have a wastegate, the function of which is to bypass airflow from the comressor wheel to stop the further increase of boost. when you reach full boost or you let off the throttle during acceleration (ie. in a turn) the wastegate will open stopping the increase of boost pressure, often ending in a pressure loss situation on the intake side of the cycle. it takes time to respool the turbo once the wastegate has closed, and since your motor hasnt stopped spinning but your turbo has, once the wastegate closes your motors exhaust air will encounter incredible resistance trying to go back through the now slow revolving compressor wheel and respool the turbo. the larger the turbo, the more speed, pressure, and time it requires to get itself back to correct boost pressure. this introduces the element of back pressure, which at correct levels is good but if improperly accounted for can diminish the life of a motor.

you see, the air coming into the cylinder from the intake side is sucked in from the escaping air on the exhaust side, thus, if you slow the escape of air from the exhaust side (ie by having too much resistance with too large a turbo) then you limit the amount of air and ultimately fuel that can get into the cylnder on the intake cycle. the smaller a turbo is, the faster it can create x amount of boost. this is because a turbo creates boost through a compression ratio powered by the exhaust side and translating this rotation to compress the intake side at whatever rate.

a large turbo connected to the same liter motor as two small turbos would not take the same time to spool as the smaller turbos even if they were half the size and fed of only half the exhaust flow each. it isnt a linear comparison, all of these functions interact harmoniously to provide power, there are hundreds of tiny steps in between that are always overlooked. a correct comparison would indicate how a single turbo setup vs a twin turbo setup differ in terms of torque curves. quite briefly, a single turbo setup would yeild slightly larger gains at x psi than the smaller turbos but at the expense of being able to create it only at higher rpms, because the exhaust flow at these higher rpms is the only exhaust flow suffecient enough to spool the turbo. for a twin turbo setup, you can spool the turbos faster with less exhaust flow, but the power gains would be slightly less but more quickly accessable because they can produce full boost much lower in the rev range.

 

Doesn't that contradict everything else you said?

 

i dont see how so...?

 

Good luck on the setup, it will take time and alot of pipe bending/welding. I'm not going to say it can't be done, but once it is done, it would dispel all the myths. If that's what you want to do, go for it. The guy that did my piping did have quite a time fabricating a front feed design but he got it done in about a week. There is room for 2 turbos when you remove the battery and saw off that bracket that holds the tray. I tried to egg him into buying a max and putting twins on it cause I told him it has never been done. He did ponder it for a moment.... Anywayz..good luck.

 

Because everything you said basically supported twins spooling faster, but that statement says a single would spool faster. That's what I got out of it anyway. My apologies if it is not what you intended, because it's a little unclear.

 

nah, i was saying that just because twins are 'half' the size of a single and may run off half the engine, that doesnt nessecarily mean the spool time will be the same for the single and twin as you previously posted. t22's from a z32 will spool much faster on a vq30 than most single turbos you will find on this board. i can see how my wording was confusing, sorry about that.

 

I would suppose that could be true, depending on their individual turbine sizes (for example) compared to the turbine size of a given single. I'm no expert on turbos, just using size as an example.

 

This is where it all comes back to the proper sizing of the compressor(s)/turbine(s).

There is a set amount of exhaust energy to spool the turbo(s) for a given setup. The spool RPM is much more determined by how one sizes the turbine side(s) than whether it is a single, or a twin (assuming they are both sized on the compressor side for similar flow potential so as not to have one of the setups have a higher MOI to overcome).

It is quite easy to make a single spool considerably quicker than a twin or the opposite.

The difference is not meaningful if one chooses properly for their application and desires.

 

go right ahead and pop in here as well, would be good to keep all the info together, nice to see you haven't abandoned the project!

as for the sequential, i was wrong in thinking it would work properly, i've drawn out several routing diagrams, and i thinkk i've found a good way to rout a dual setup (one off each bank)
no new parts as of yet, will keep everyone updated though

 

Why cant you guys for once just support someone? I think this is a damn good idea myself. Twins have been proven to have significantly less lag, and produce a LOT of power. I would love to see this done.

Also, saying you have a twin turbo max would be pretty cool. Really make people go...what?

 

We are supporting him indirectly. A lot of it is constructive criticism. I'm all for doing something unique. In fact, my Max's future may hold something just as unique, although far less complicated.

We just want to see the most come out of this, that's all.

 

We are giving him constructive support. There is nothing wrong with twins except that they are a PITA to find room for in our applications. When he was talking about making a sequential setup, we applied a dose of reality to save him much frustration later.

I do not accept your statement of twins being proven to have significantly less lag than singles though...what is this proof you are basing your position upon?

 

it's good to hear things about potential problems i may run into as well as "constructive criticism", i have no problems with this, the thing i don't want to hear are...

"it's not worth it" (it's worth is in the value to the individual)
"it can't be done" (because it will be)

thanks for all your support and hopefully soon everything will start to come togerther

 

good luck im staying tuned..

 

waiting on brandon (vortecpower) to get his car going, he's suppose to sell me his fmu and then it's on!

 

I'll give you mine.. you just have to come get it

 

man your gonna do all this and then realize you have a fwd car lol, thats what happened to me, I did my turbo setup and was like damn FWD!!!! I HATE YOU!!! but i love my car to death and if i had to do it all over again i would, good luck with everything hopefully i can chime in at times and give some advise.

 

Good luck with that

 

Are there any updates on this setup?