Turbo Top Mounts?

[Fryday13]

Basically I want to know what the point of having a top mount system for the turbo improves? Do people just get it for look so show off their turbo or does it actually improve any performance? Or is it also a bit like the front facing plenum where some people get it just because they like the ease of access to parts.

Cheers

[R31Nismoid]

Use of space mainly. It's easier to top mount a larger turbo, and cheaper because to low mount you'd generally need a 1-off manifold.

I mean I've seen a GT40 low mounted so it can be done, there is just no room to work on it without major arse ache

Centre of gravity/weight distribution and all that shit, low mounting in theory would be better. For street cars it matters not.

And a front facing plenum, generally makes shit harder to work on (save for a plug change). When you split hoses under the plenum, you'll understand the pain that a larger FFP creates hehe.

[Fryday13]

Ahh thank you very much!!!

I now Understand the Top Mount part, but am more lost ont he front facing plenum, Im assuming you have a front facing plenum so would you say it is still more advantageous to have? I just am nto lookign forward to the day I have to change a plug and have to go through a significant amount of unbolting to do so.

[KiwiRS4T]

No the opposite - he's saying apart from ease of plug change everything else is harder to get at. You'll get quite good at pulling off the crossover pipe etc after a few goes!

[GTSBoy]

Crossover pipe removal is 2 minutes and 1 skun knuckle. No more.

[Mitcho_7]

if its a stock rb25det and you want to put a hi mount turbo on, you will have to either get a ffp or get some custom cold side cooler piping as it wont work with the stock crossover i dont think.

[hypergear]

A proper top mount manifold with a good waste gating system will make a gain in performance. Same can also he archived using proper low mount. Inlet manifold how ever doesn't gain much or I have seen people went backwards. not much of point changing unless maybe hug power or for looks or intercooler popping installation convenience.

[Hanaldo]

Inlet manifold how ever doesn't gain much or I have seen people went backwards. guess not much of point changing unless maybe hug power or for looks or intercooler popping installation convenience.

Haha well you've certainly changed your mind on that!

[GTScotT]

I normally like the FFP for giving more flexibility on injector choice. Makes it nice and easy to use a china rail and top feed injectors.

I also believe a top mount is generally beneficial for packaging reasons. If you were to build a nice low mount it would work just as well as the high mount, and as Ash said probably yield better centre of gravity which is a moot point on the street anyway.

in general terms it has been said that the stock plenum has more torque than an FFP due to the longer runners.

also try not to get confused as most people say low mount referring to the stock manifold (because it is a low mount of a sort). as a rule of thumb a quality high mount will have nice gains over the stock lowmount, but if u paid the premium for a custom low mount the performance should match the highmount.

i hope that helps

[R31Nismoid]

A proper top mount manifold with a good waste gating system will make a gain in performance.

As opposed to a proper low mount manifold/gate setup?

Not one iota of difference between the two at all.

No the opposite - he's saying apart from ease of plug change everything else is harder to get at. You'll get quite good at pulling off the crossover pipe etc after a few goes!

[hypergear]

Just add stock exhaust manifold is not accounted as a proper low mount or low mount at all. Proper low mount means some thing like a HKS or 6 boost or Brea low mount with ext gate setup.

[Fryday13]

Essentially what I'm reaching for is over 250 rwkw, So I suppose the best question is, Will I require either or both of these to attain this goal? or what are peoples preference to this?

Also is there a quick how to guide for the Crossover pipe removal? Everytime I look at it it just seems a much bigger task than you say

[hypergear]

For 250rwkws you can get that by just high flowing your stock turbo on stock manifold internally gated. Or depending on what the high end of the goal is.

[Hanaldo]

Essentially what I'm reaching for is over 250 rwkw, So I suppose the best question is, Will I require either or both of these to attain this goal? or what are peoples preference to this?

Also is there a quick how to guide for the Crossover pipe removal? Everytime I look at it it just seems a much bigger task than you say

It's two/four clamps, not hard at all!? lol.

Also, 250rwkw is very easily achievable, you don't need a manifold or anything. ECU, injectors, turbo. Assuming you've got the other bolt ons already, exhaust, FMIC, etc.

[R31Nismoid]

Essentially what I'm reaching for is over 250 rwkw, So I suppose the best question is, Will I require either or both of these to attain this goal?

No, and it would be a waste of money to do so.

[Dajae]

Stroker kit rebuild, strap on a to4z, e85, and 25 psi :D

[Fryday13]

Haha perfect . . Thank you All!