Ooops, We fitted a top mount intercooler....

[227angrydonkeys]

bonnet scoops are largely cosmetic when forward facing. they tend to fall with in the boundary layer alot of the time so dont actually scoop anything in at all. especially when the under bonnet pressure is equalised by the air coming in through the front. they look $$$$in sweet though and ill be fitting one as soon as i can afford it on the list of things.
top mount intercooler heatsoak happens worst when stood still, in traffic for example, the still air rises and warms the cooler up and then when you come to pull away its not working at all. but to front mount it means longer pipe runs and more lag, plus im guessing the hilux doesnt run particularly high boost pressures so there isnt going to be as much heat buildup in the cooler. so its less of an issue
i think a bonnet scoop will actually work better if it faces backwards.

[Andy Dawson]

That got to be one of the nicest after market scoops I've seen. Good skills folks!

I've got a 3rd gen with no inter-cooler and feel that it would make a pleasent boost to my motors performance.

Looks like The Lovely Boyo and his Misses (Mistress Jig Saw?) have show me the way ahaead Unless some one has a spare 3rd Gen KZN 185 Inter-Cooler kit and bonet lying around

[dave.j.robbo]

Hello

Did I mention we lifted the body on the weekend? That 1 1/2'' made ALL the difference - ooooo errrrrrr missus

So now you're the experts!!

OK, planning a future weekend..
Saturday doing a body lift, Sunday fitting the 'cooler!!
Sounds like a good plan to me!!!

[The Lovely Boyo]

****top mount intercooler heatsoak happens worst when stood still, in traffic for example, the still air rises and warms the cooler up and then when you come to pull away its not working at all. *****

Attached picture off ebay showing a complete L200 intercooler - this is the underside. Note the fan that draws air through the cooler when it gets too hot - when stood in traffic I suppose. So when you pull away, the cooler is cool! Mine still has the electrical connection - temp sensor still in place.

I have enough room to fit one of these fans.

So I will (soon, I promise).

[227angrydonkeys]

thats a great idea i like that.

[Maverick]

If you didn't do the body lift would the intercooler stick out a lot?
and if so couldn't you possition it inside a scoop so it always had fresh air?

Top marks to you, I haven't the guts to go near mine with cuttin tools, but then again I can't do a staight line with a ruler!

[BUSHWHACKER]

[QUOTE=Maverick]If you didn't do the body lift would the intercooler stick out a lot?
and if so couldn't you possition it inside a scoop so it always had fresh air QUOTE]


That's how mine is (will be) set up.

[The Lovely Boyo]

If you didn't do the body lift would the intercooler stick out a lot?
and if so couldn't you possition it inside a scoop so it always had fresh air?

Hello,

If you had a very deep scoop (Subaru?) then maybe, but it will be very close to the oil filler and you will have trouble topping up. Some of the 3rd gens have the oil filler at the front of the cam cover which would make life very easy.

Also, there would be a potential clash with the heater pipes at the back of the engine.

[Apache]

bonnet scoops are largely cosmetic when forward facing. they tend to fall with in the boundary layer alot of the time so dont actually scoop anything in at all. especially when the under bonnet pressure is equalised by the air coming in through the front. they look $$$$in sweet though and ill be fitting one as soon as i can afford it on the list of things.
top mount intercooler heatsoak happens worst when stood still, in traffic for example, the still air rises and warms the cooler up and then when you come to pull away its not working at all. but to front mount it means longer pipe runs and more lag, plus im guessing the hilux doesnt run particularly high boost pressures so there isnt going to be as much heat buildup in the cooler. so its less of an issue
i think a bonnet scoop will actually work better if it faces backwards.

Boundary layer? 2" thick at 40mph? I would doubt that any car generates flow clean enough to end up with a consistent boundary layer anyway. Flow is likely to be turbulent pretty much anywhere you have an angular change anyway, which means everywhere back from the bonnet / radiator grille junction. There will be flow into the intercooler duct, but how much depends on how much positive pressure there is in the engine bay (probably comparitively high). Boundary flow will be a minor factor.

[dirtydog]

Yeah, I think Tim was more referring to not being able to get a 3rd gen bonnet on to a 2nd gen. Well, you could, but it might look a bit funny...

spot on.

[227angrydonkeys]

Boundary layer? 2" thick at 40mph? I would doubt that any car generates flow clean enough to end up with a consistent boundary layer anyway. Flow is likely to be turbulent pretty much anywhere you have an angular change anyway, which means everywhere back from the bonnet / radiator grille junction. There will be flow into the intercooler duct, but how much depends on how much positive pressure there is in the engine bay (probably comparitively high). Boundary flow will be a minor factor.

all i know is that my last car had a big scoop on the bonnet feeding a top mount intercooler, it was designed by nissan and it was later found to do $$$$ all below about 90mph. when i say boundary layer im talking about that whole turbulance thing. theres basically not enough clean air going into the scoop. it caused huge amounts of heatsoak into the intercooler which most people moved to the front of the car and suffered slight lag but in favour of a consistent boost pattern and no detonation. however id stil lfit a scoop cos its a manly thing to have.

[Apache]

Agree that 'certain' cars need scoops on the bonnet to prove their manliness, but all top mounted coolers suffer from heatsoak when stationary (the fan od the back is a great idea). On something like a Surf, this really dont matter a jot. It's not like you're demanding 30lbs of boost instantly is it?

On cars like Evos, Scoobies, and those dreadful 'playstation like' computerised Nissans, the driver probably is going to demand max boost instantaneously, so the clued up owner will move his cooler to the front of the car.

Anyway, there is an easier way than an intercooler (Not Nat West) and it's made by Aquamist.

[bundubasher]

Fantastic! Well done that man! Now that is a good mod - if it improves performance. Then again even if it doesn't it still looks great! (By the way - that's a suspiciously "shiny" motor you have there...have you been "buffing" it with your chamois?)

[BUSHWHACKER]

all i know is that my last car had a big scoop on the bonnet feeding a top mount intercooler, it was designed by nissan and it was later found to do $$$$ all below about 90mph. when i say boundary layer im talking about that whole turbulance thing. theres basically not enough clean air going into the scoop. it caused huge amounts of heatsoak into the intercooler which most people moved to the front of the car and suffered slight lag but in favour of a consistent boost pattern and no detonation. however id stil lfit a scoop cos its a manly thing to have.

Agreed, thats why I have two vents either side of my intercooler scoop so that most of the hot air can escape which has got to help the heatsoak issue.

[227angrydonkeys]

thats plenty of manly scoops you got there.
does aquamist work on a diesel??