Outer Limits 4x4 Board

Can someone enlighten me on the fors and againsts on a high or low mount manifold for a tubo on a td42. Is there any advantages of either.

Kind regards Rusty

high mount fowls the engine pipe on the aircon pipes, easier to get at the turbo and higher out of the water? low mount lower to the water but wont fry your second battery.

High mount: Pros: Easier to plumb, slightly less lag, less chance of thermal shock with water, looks cool
Cons: More heat / less room in the engine bay and exhaust can be a bit tricky.
Low mount: Pros: Cheap to set up (can use an adapter onto a std manifold), less heat in the engine bay, more room in the engine bay and the exhaust is easier to set up.
Cons: More susceptible to thermal shock with water, slightly more lag and not as cool looking.

I doubt there is any lag difference no a td42 with either manifold. I have fitted Safari, AIT, DTS and standard nissan manifold in low mount and Denco and turboglide highmounts. The runner design would be almost identical aside from which way the collector faces.

The lag I speak of is the distance from the compressor side of the turbo to intake manifold, which is negligible, but slightly longer on a low mount.

BadMav wrote:The lag I speak of is the distance from the compressor side of the turbo to intake manifold, which is negligible, but slightly longer on a low mount. ;)

So maybe 70mm? But a valid point if not considering intercoolers.

I dounbt that you could find a way to measure the difference aside from calculations which would prove how miniscule it would be.

try a mid mount for somthing diffrent

Yeah, you're right it would be absolutely bugger all, like you said minuscule (probably not worth mentioning then ). I only noticed a difference on my 75 series 2h-t when I mounted the 600x 300 front mount on and then there was quite a lull before it boogied but geez, hang on when it did.

Low mount: can run top mount IC, and leaves room for all of the other crap in that top-corner, and keeps heat away from the second battery, oil and water plumbing for turbo is a bit shorter.

High mount: direct route to intake manifold (only a fraction shorter than low mount though), can't run top mount IC due to heat and space issues, extra work involved for water/oil/exhaust, extra heat near second battery, air intake (pre-turbo) is easier to rig up compared to low mount.

I think what people are saying is that it's much easier and makes more sense to low mount your turbo.

The only real down sides of which are that if you happen to have enough water in the engine bay it'll get wet suddenly, and you can't just pop your bonnet and say to your mates, "look at my fully sic turbo bro." It's slightly less cool to have to point down the side of the motor to show off said turbo.

Save the extra hassle and low mount it. You don't even need to buy a manifold then. You can just fit an adaptor plate to the std one if you're running T28 turbo or other than T3 flanges.

there are also more airbox options for running a low mount. You will find it alot harder to fit a top mount airbox with a highmount turbo. Denco use a top mount airbox but the pipe work is very tight on the bend and would be restrictive. So running a highmount only leaves the option of a GU or GQ precleaner airbox if running an AUX battery on the LHS mudgaurd.

anzac wrote:Save the extra hassle and low mount it. You don't even need to buy a manifold then. You can just fit an adaptor plate to the std one if you're running T28 turbo or other than T3 flanges.

Do you have any further details on using the stock manifold with an adapter?

GeeC wrote:

anzac wrote:Save the extra hassle and low mount it. You don't even need to buy a manifold then. You can just fit an adaptor plate to the std one if you're running T28 turbo or other than T3 flanges.

Do you have any further details on using the stock manifold with an adapter?

+1

Does anyone know if you can buy these adapters off the shelf?

You sure can buy the adapters of the shelf.

Cris

Renton wrote:

GeeC wrote:

anzac wrote:Save the extra hassle and low mount it. You don't even need to buy a manifold then. You can just fit an adaptor plate to the std one if you're running T28 turbo or other than T3 flanges.

Do you have any further details on using the stock manifold with an adapter?

+1

Does anyone know if you can buy these adapters off the shelf?

Any good performance workshop will have them, or you can get them online easy too:
http://cgi.ebay.com.au/T25-T3-Adaptor-F ... 27ad5b61b8

NOTE: Be careful of clearance between your turbo and chassis!

Coxy, Cheers for the link but I was actually refering to the adapter that someone mentioned to go from the standard exhaust manifold to bolt the turbo on.

Cris, As above, is that the same adapter you are refering?

I can't say i've seen any "adapters" that bolt to a stock manifold (ie. N/A manifold), unless you are talking about a "J" pipe - which i'm fairly sure any reputable workshop would steer well clear of (as its a bit dodgy).

I think anzac needs to clarify which "std" manifold he was referring to (N/A, TD42T etc.).

i give a vote for top mount turbos , as thats all ive had on patrols

they are easy to work on and as everyone has said wont cop all the water!

i have a denco turbo the only problem i see with those is the horrible 90 degree bend dump pipe which seems like it would restrict the exhaust system a little
all in all i like the denco set up

dont cheap out on a turbo kit tho ,spend the little extra to get the best

No one has mentioned real performance values between the 2 manifolds yet. I'd be really interested to see if there is any. I know when I got mine rebuilt the guy insisted on a high mount turbo. (He normally builds ricer cars). But he never really went into why. It may have been as simple as having space to run the plumbing. Everything was either 3" or 4" piping so it took up a bit of room.

coxy321 wrote:I can't say i've seen any "adapters" that bolt to a stock manifold (ie. N/A manifold), unless you are talking about a "J" pipe - which i'm fairly sure any reputable workshop would steer well clear of (as its a bit dodgy).

I think anzac needs to clarify which "std" manifold he was referring to (N/A, TD42T etc.).

Theres reference to 'J' pipe with pics in this thread, http://www.outerlimits4x4.com/ftopic114 ... 2+manifold

I researched manifolds types and adapters a while ago and a 'j' pipe is the only option I found for a standard manifold. Some of the ricers use this as a budget option for there conversions.

cheers.

anyone heard of turbo's blowing up cracking??? when they get in water?

hokey wrote:anyone heard of turbo's blowing up cracking??? when they get in water?

The only trouble I've had was my factory cast dump pipe broke.