I am still considering it especially if these 350z headers pan out.

 

yea you should check out the spacing on the 350 manifolds or you can look and find ones that might be closer to what you need. if you do end up finding a set that will work out it should definitely make plumbing the system easier and less complicated. the other good thing is that they come with turbo flanges already welded on. as far as space in between the engine and fenders idk. you could go with wheels with greater offset and then put a slight indent in the fender where the turbo would sit. as long as its not touching and you have a good damper on your engine that keeps it from rocking too much then it should be fine. Nissan Performance Racing Products for International Sales from SSAutochrome Inc. check out the skyline low mount manifolds and the stock replacement manifolds. the 8th and 17th from the bottom. before anyone tries to say that the skyline is a straight 6. ya i know, but these are two separate manifolds for a tt setup.

 

Project Infiniti G35 Twin Turbo | G35TURBO.COM Heres another possibility. the manifolds on this kit look like they tuck in pretty neat.

 

Well, a straight six is always going to have the exhaust ports on the same side though, right? Or is it different for you import guys and your crazy multi camshafts I like the look of 1 turbo on either side of the engine bay, but thats just personal preference.

Question. I realize that on a racetrack, having both turbos as close to the ports of each head would be the best for optimal performance. In this case though, assuming he was going to drive it on the street, couldn't it actually be helpful to have one turbo further from the exhaust than the other? When i think of it, I see one turbo spooling earlier in the RPMs than the other. Wouldn't that actually help to increase the hp throughout the powerband, instead of kicking it all on at once? I used to drive my 7.0L on the street, and that much torque can get frustrating. Or have i got this figured wrong?

 

In this case though, assuming he was going to drive it on the street, couldn't it actually be helpful to have one turbo further from the exhaust than the other? When i think of it, I see one turbo spooling earlier in the RPMs than the other. Wouldn't that actually help to increase the hp throughout the powerband, instead of kicking it all on at once? I used to drive my 7.0L on the street, and that much torque can get frustrating. Or have i got this figured wrong?

No. The compressed air is going to the same throttle body. There will just be more lag with one further away (how much is yet to be seen). There's a reason that people buy a pair of headers to gain power and keep their engine running smoothly. When you have two different exhaust gas paths with differing flow rates/velocity you going to have different combustion situations therein, which is not ideal.

 

Ok I picked up a gasket from an 05' 350z and it looks fairly promising the shape and size of the holes are virtually identical to our cars. The difference as we pretty much knew was in the spacing between each port. in order to best determine the spacing I centered the two center holes which line up nicely and measured the variance on the outer holes. Each outer hole on the 350z is a hair over 1/2" wider than the Legends gasket. So I am thinking this could be worth a shot. At the price these are available for it would cost more than that just to buy the material for a custom set to be made not including labor, and even better I will not have to hack up my OBX headers. One thing I do need to consider though is the amount of stress that 1/2 would cause. I think it would be best to heat them up and correct the variance. here's the pics.

 

Do you plan to heat-bend to match?

 

Absolutely, which led me to my next thought which was that I better not get the ceramic coated ones and just get the stainless steel ones where the flange is welded on this way the flange would be easier to remove and I don't have to contend with or ruin the ceramic coating when bending them to fit.

 

Get to it!

 

This makes things interesting, these are from a Porsche 996 years 99'-04

it certainly looks close.

 

99-04 Porsche 996 Non Turbo Stainless Steel Performance Headers - $300.00

~$300.

OBX are on Ebay for a similar price. It's probably going to be more of a headache hacking up manifolds that might not work and will be more work either way...

 

hope that works ima watch just to see if i can do the same thing

 

I found them for 100.00 shipped

 

Ok the porsche ones are definately out they look like they A. facing forward with the collector on the lower part will hit the alt and the PS. and B facing forward woth the collector on the topside won't clear the valve covers.

 

You may already know someone local who could make you some, this site lets you fill out specs and gives you an estimate. CES - Custom Headers

 

I have decided on the 350z headers then if I need to re-work them I will

 

GIT R' DUN!

 

Ok it was difficult to make the decision to spend 100.00 on an item that is in question as to whether or not it will work but I think somehow it either will or will be forced to work lol. But I have to answer the question that many of us wonder, just how close are these?

I will know very soon, let us pray :angel:

 

now the true tests begin good luck ... alot of blood sweat and tears are gonna shed in this project aren't u glad u have us

 

Indeed!

 

you do know you have to chuck those on for a NA perspective right? I'm thinking it may have to be forced a wee bit due to the fwd layout, damn engineers. As for praying, let's hope it doesn't take the biggest hammer you have

 

For your next project... I want you to turn a legend into a transformer:bowdown:

 

Ya but i was saying that two of the same turbos would seem to mimic the effect of a large/small. It seemed like, in essence, your post agrees that it would, It would just be so ineffecient (from the wastegate opening on the closer turbo), as to not being a practical consideration for application.

Im hoping thats right, because then it all makes sense in my head, otherwise im confused again:bigok:

I want an update from Telion or im starting work on my transformer.

 

You're still confused...unless the mimicry is that the turbo system would suck ass until both turbos spooled.

The performance would be degraded if there was a significant difference in distance between the two turbos in a biturbo system. You must realize that the 'twin' turbos are each about half the size of optimal (even here) to get the car boosted at a given flow rate. If you've only got half the flow rate while you're waiting for the other turbo to come up then you're way out of the efficiency range of the first turbo, making tons of heat and not much power. This is not to mention that the first turbo, sharing a plenum with the second could actually stall the compressor on the second turbo because the boost pressure on the intake side could overcome the power and inertia being exerted on the turbo with the less efficient positioning.

So:

big/little is most effective in sequential (series) for maximum effort

little/little is most effective in parallel for maximum effort

little/little sequential (series) would have very fast boost response with a reduced total flow ability. This is probably what you're really thinking about with your train of thought, but you've got the exhaust paths wrong to make it work.

 

You're still confused...unless the mimicry is that the turbo system would suck ass until both turbos spooled.

I Loled at that.

Yeah actually I understood that it would be woefully inefficient, and suck ass. I was curious as to what exactly would happen. I gotta be able to completely visualize all variables and there effects on each other to gain real conceptual knowledge. So i ask a lot of questions, hope i don't annoy:bowdown: Im a bit of a knowledge addict but we can smell our own and this thread is full of em.

Anyway, the rest of your post cleared it up for me, thanks.

 

Sorry for there not being too many posts lately I will try to update with some progress and pics tonight. Grumps your train of thought (in a much more scientific manner than mine) is the same as mine. I think a small set of twins will be just fine for now, and I will upgrade upon continued success, this is a learning process for me. I have decided to further entertain the relocation of the battery to the trunk and am currently working on setting it up as such. In addition the intercooler piping has come in and as predicted I am still a few pieces short to complete that but I wanted to get started to see what else I would need. hopefully the 350z headers and piping will be here by this weekend and I can either cry or celebrate . I am however still convinced that I (with help) can get it to work one way or another.

A couple things anyone know a great place online for 0 gauge wire? how many feet I will need to get the battery to teh trunk for + & - terminals?

And is anyone currently running a 3" muffler (now I know why DV8 pulled his whole exhaust line, that took me long enough to figure out lol).

Oh side note. many things I have put together in my head as far as spacing and placement of stuff have changed drastically so if you do this, get an idea, set a budget, (knowing you will exceed it), get the stuff then work through your ideas with the actual stuff in hand. I here captain obvious in the back of my head lol sorry!

 

Grumps your train of thought (in a much more scientific manner than mine) is the same as mine. I think a small set of twins will be just fine for now, and I will upgrade upon continued success, this is a learning process for me.

This is the only reason I'm so excited to help you out. You know what you are/aren't doing and you've got a reason for it. Jesus Christ man, are you a genius or something?!?!

A couple things anyone know a great place online for 0 gauge wire? how many feet I will need to get the battery to teh trunk for + & - terminals?

Welding supply stores tend to have heavy gauge wire for cheaper than anyone else. I'd ask for 1/0 gauge (pronounced one-aught). You should only run the + wire to the front, I'd run heavy grounds to the chassis, front and back, a long ground run will be counterproductive. I mean chassis, as in the hydroformed frame rails, not the sheetmetal in the trunk.

 

Why the 350Z headers anyway? I mean for giggles, why not, but unless the pipe routing is going to be better for you I don't know why you aren't sticking with the stock units...equal length headers aren't anywhere near as important on turbo cars.

 

Thanks Grumps, and gotcha. PS thtowing the X-pipe in the mix was just what I needed and it helps ed in a couple of areas actually. Now brace yourselves as I am either going to pul this off or have sever heat soak in the engine bay. I too now am a bit buzzed but I work and play pool well this way lol. Ok I am going to need to ceramic coat, heat wrap and vent my hood lol, then throw in some purple ice by royal purple. But here we are picture hot lavas setup shifted forward toward the bumper the up between the radiator and the engine. Also bare in mind that I had to lean stuff up against things and that the final build will not be this way. I thought ok what I need to do is beable to create a common element that will work whether or not the custom headers are a success and include the X-pipe and wahlah we have this. ok what you cannot see is that the two exhaust routes will go to a Y pipe that will go up and over the drivers side axle and out the back, and that the X-pipe as before will cross over ie the passenger side (custom header or not) will x-over to the turbo on the opposite side. If you get this and are a photoshop genius please attempt to illustrate. I also removed soon to re-locate the windshield washer resevoir. possibly for a water injection system (more on that later one step at a time) yes I know need internal piping heat temps high. Ok here are the pics, think everything possible to keep outside heat pipe down and that there will be better spacing between items that will burn and that I am going to switch my upper and lower radiator hose out for something more resistant and slightly relocated to avoid heat. Lastly would it be a good idea to isolate the radiator? and yes I will be using turbo hotside blankets.

Also as stated previously I need more elbows and will need to do custom flanges to mount to the turbos too.

 

Holy fecal matter it just might work.