An idea for tt...
 

so why have no manufacturers developed a tt setup that has top mounted turbos? is it a space issue or just a practicality issue? idk about anyone else, but i think a couple turbos sitting in plain sight would be badass. could a manufacturer possibly develop a reverse mounted manifold to add retorfit onto existing tt setups to put the turbos on top. i kno this is a somewhat common practice in the supra, skyline, and sr20 world

however like i said, i dont know if we would have IC piping issues with this setup.


something like this...

http://www.the370z.com/members/edub3...le-turbo-1.jpg

(only without a turbo the size of a beach ball.....)

:yum: I feel like this is much more of a show setup and you will loose some effenciancy? (lag, heat issues) Maybe a turbo guru can chime in though..

The closer the turbos are to the manifolds, the quicker the spool. A reverse set of manifolds would be ideal for a twin top mount setup, but then where do the downpipes go? It would be very difficult to fit 2.5" downpipes, let alone 3" downpipes if the turbos were mounted up top. My downpipe setup was horrible....a 3" band clamp had to be used due to space constraints, which led to an exhaust leak.

one we have no room, and two you want to keep the heat in the exhaust and turbos for efficiency. theres much more to it but thats a few points.

someone has done it, do a search. :) hahaha the guy who beat me to the post :P

Much easier on the Supra since one side is intake and one side is exhaust. You couldnt fit two huge turbos on top like in your pic if it was a v6 supra. that engine is an inline 6.

ya i kno 98intrigue did it. that came out great look. so i thought if 1 was good, then seeing 2 was better lol

Not to say it can't be done though...

http://ll.speedhunters.com/u/f/eagam...TAS11-1551.jpg

:yum: :drool:

As others have mentioned, a top mount kit is form over function. You want to hang the turbos as close to the exhaust outlet as possible to get all of that energetic hot air through the turbine. Moving them up away from the exhaust outlets just creates extra piping and loss of energy, not to mention if you have ever seen a turbo's hotside glowing yellow on a dyno, you would realize you DO NOT want those sitting that close to other bits of engine that were not designed to be exposed to that kind of severe heat.

yea like the radiator!!!

the manifold wouldn't have to be changed theoratically.. save for maybe the bolt patter and angle that the turbo sits. by just flipping it 180 wouldnt that gain the desired effect without increasing exhaust distance??

TBH im a little surprised a company hasnt done this on a show car yet. i mean 2 snails up top would look completely BA

http://www.the370z.com/members/edub3...e47137-ttt.jpg

something like this would be perfect. spool time increase would be neglegable and IMO it would make everyone that looked under the hood happy in the pants...

You should try it op..

I don't think the engine bay has anywhere near this much room to position the turbos in this manner.

http://ll.speedhunters.com/u/f/eagam...ine%20copy.jpg

I'm not sure what to tell you other than you are over-simplifying the actual engineering challenge by about 10^7 percent, and again, to make a kit that would almost certainly perform no better or worse than a low mount twin kit.

Most companies building these kits are doing so to make money and not one-offs to make people "happy in the pants." That whole recession thing has changed a lot of shop's thinking.

deal!

now if only i had the funds... Now accepting donations!

If the top mount kit used tubular manifolds, vs the current cast manifolds ("low mount kits") it would outperform the cast manifolds all day long.

All the cast manifolds for the VQ have been a big restriction when it comes to big numbers, and no, 700whp is not big numbers. I am talking numbers north of that. Not to mention using an external wastegate, and something other than a T25 turbine housing with a tubular manifold.

You will never see a big power VQ with a cast manifold, but you will see one with a tubular, equal lenght manifold.

wow that is just amazing! i know there is a shop in Denver Colorado that i thought about going twin turbo setup on my car but the kit is very expensive and the turbos are very advanced.

But i guess if you have allot of money anything is possible. he he he

Trish

I agree, boosted z. Log manifolds are not the best for flow. You do want to keep heat in the turbine housing, but a simple coating or exhaust wrap can do that for you. A tubular manifold will scavenge exhaust gases much easier from the heads. Log manifolds are easier to produce (most bolt on kits use cast iron), and it's easier for them to retain stock parts like ac/power steering and stock downpipe locations rather than building a top mount manifold. I wouldn't say that top mounts are all form, they do make good top end power and high dyno sheets from what I've come across.
Switching from a log manifold to a tubular mini ramhorn, I saw the same power levels at lower boost pressures on my other car. Just my opinion

You've been saying you're interested in boosting your Z:stirthepot:

I contacted full race about doing a tubular manifold setup for the vq - they said no :(

Is there even enough room for them?

I don't mean to argue that tubular isn't better than cast "log" manifold. I am talking about the bigger picture, which is making the entire kit work in the space we have without giving things up like accessories. For our platform, I just don't believe top mount is a better solution and I think the product offerings out there tend to support that circumstantially. I'm not saying I don't want someone to try, or that it wouldn't look cool, or that it couldn't make great gobs of power, but rather, that it's not the best engineering decision for our cars accounting for all variables.

As far as mass production goes anyway.;) Im thinking hard about doing this myself I plan on buying a TIG in the next two or three years and cant wait to tear something up with it. lol