Jump to content
SAU Community

Turbo Top Mounts?

Fryday13

By Fryday13,
in Engines & Forced Induction

 Share

Recommended Posts

Fryday13 Collaborator

Fryday13

Posted
Posted

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

Link to comment
https://www.sau.com.au/forums/topic/404900-turbo-top-mounts/
Share on other sites
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

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 Collaborator

Fryday13

Posted
  • Author
Posted

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.

hypergear Grand Master

hypergear

Posted
Posted

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 Grand Master

Hanaldo

Posted
Posted

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! :P

GTScotT Grand Master

GTScotT

Posted
Posted

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 Grand Master

R31Nismoid

Posted
Posted

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!

:yes:

Fryday13 Collaborator

Fryday13

Posted
  • Author
Posted

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

Hanaldo Grand Master

Hanaldo

Posted
Posted

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.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • joshuaho96
      R33 GTR running -9 with no tune

      By joshuaho96 · Posted

      Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • GTSBoy
      NC MX5

      By GTSBoy · Posted

      Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • GTSBoy
      R33 GTR running -9 with no tune

      By GTSBoy · Posted

      So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around with a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
    • joshuaho96
      Squeaking clutch/throw out bearing

      By joshuaho96 · Posted

      Yep, this bit another local owner. I caught it before putting the transmission back into the car, what I noticed was the pressure plate fingers weren't flat and even. It's more obvious with the pull style clutch because the throwout bearing ring was visibly not flat once everything is put together. Nismo should really update their instructions to call out this specific detail. I'm not even sure the clutch as-shipped orients everything properly.
×
×
  • Create New...