catons scooby

hi every1, im in the mood for designing ****, im fitting a sti8 intercooler to my99 classic wkend and then messing with the scoop undertray to make full use of it, but i want to make use of the small vent to force cold air onto the turbo another way ive drawn a diagram on paint(amature i know) of the bonnet with a vent idea, black is outside red is inside the bonnet, tell me what you think, problems that might occur, im going to use plastic trunking(electrical side of my knowlegde plus its free(pinched)) thanks for looking ppl, let me know,

mark c

911

I have done the Sti V8 mod.

Above all make sure you have a GOOD seal beween the bonnet and the edge of the TMIC. Without that no matter what mods you make the air will not pass through the tmic matrix.


Seal foam came from RS so you should be ok!

Graham

catons scooby

catons scooby

click to view better image

Bat-Fink

Will this be any good though?

Can see if running a top mount cooling the exhaust turbine would be a good idea.

catons scooby

well as it goes "heat rises" so if a slight down force of cold air was to hit this heat before it gets to the intercooler fins for eg it might keep the intercooler cool at high speeds
mc

catons scooby

i might add a small fan connected to the colum just above the turbo to cool it down and prevent the heat from rising,
mc

catons scooby

come on people comment
yes good idea no poor idea

cheers mc

911

1
When the car is moving slowly, the heat in general/turbo in particular will soak in to the TMIC. It will take a long time for the thing to cool down I assure you.
Adding a fan will certainly help.(but not cure the problem.)
2
When the car is moving quickly, unless that fan can displace more air than that entering the scoop it will block some air to the TMIC.
3
The TMIC needs air to flow through it AND exit the engine bay, past the gearbox and past the turbo/downpipe which is stinking hot.
4
The TMIC needs a good ATOMISED water spray to quench the TMIC metalwork and pressured air from the turbo. This water needs to be carefully directed to be effective. You need a LOT of water. I use 1 litre per MINUTE on my car.
5
People fit FMIC's to avoid all 4 above (like I did), but I added water cooling too. The FMIC is very effective compared to the TMIC in all of the car's situations, but it is vulnerable to debris/birds/cats and dogs let alone stones.
Mind you, seen the condition of most TMIC fins?

Hope this is food for thought.

Graham

Floyd

iTrader: (9)

Graham, I think the chap wants to know if he can direct air from one of the 2 bonnet vents at the front, to the turbo.

IMO you could do but it makes sense to do what I did on the same converstion - see my project thread for dtailed info on this.

F

KIPS

Hello Mark thought about lagging turbo and down pipe to keep the heat in
KIP

911

But why fuss over the turbo cooling that way?

The car standing still will soak the TMIC. Fan on the turbo will not stop all that as there is heat coming from everywhere.
On the move the airflow through the scoop and TMIC will flow by the turbo area so removing the heat.

This is why the solution to it all is a FMIC.

The slanted WRX etc had a chimney tube to rid the turbo heat and the scoop directed air to cool, my Sti v3 scoop plate had simple louvres to do the same, bit of a token gesture to the issue.

Graham

catons scooby

points taken

fitted the intercooler today kips looks plush

my main aim is to direct even more air to the turbo to cool it down whilst moving from one of the small vents, as they do nowt neway why not use 1,


thanks for the feedback keep it coming,

KIPS

get some pics up or pop round when passing
KIPS

catons scooby

will do when i find the cable for camera

silent running

The hot side of the turbo needs to stay as hot as possible. The cold side needs to stay as cold as poss, although this isn't so crucial because you have an intercooler to deal with its charge. The slots in the undertray are there because not only do you want downward airflow through the scoop and out past the downpipe, you also want hot air to rise off the downpipe/turbo and have somewhere to go rather than being trapped in the engine bay, when at standstill.

I have personally done pressure testing around engine bays on various motors, and one thing has come out of it that runs contrary to what most people would expect: sticking a pipe into a well packed engine bay and expecting it to flow more air in from the outside is bull****. The general air pressure under a bonnet is always much more than it is outside. In fact what happens is that cold air that is apparently being 'rammed' into an engine bay is actually just stalled in the tube and the net effect is **** all to coin a technical term.

I would expect there to be a lower pressure area around the sides of the gearbox where engine bay airflow is exiting when on the move, but it will be no more efficient at sucking air through a narrow tube, than it would sucking air through some louvres in your undertray. OK it might direct it specifically onto the cold side of the turbo, but at standstill, you'll have effectively blocked off the only path for turbo/downpipe heat to escape out through the scoop. And it will instead rise through the intercooler even more!

911

Hence #9 and #12 above.

catons scooby

point taken


ill get back to the drawing board lol

911

It is good to try to innovate and see things in a different way.
Several on here have added cooling fans to the TMIC to enhance the cooling but keep the advantageous short pipe tracts of the TMIC, but the FMIC offers so much more (IMHO)
Graham

Floyd

iTrader: (9)

So why didn't you go FMIC in the first place?

F

911

I knew no better, and I didn't want to butcher the car too much.

The FMIC certainly cuts into the car you must admit.
The overall work and cost comes to about the same in the end, or at least it did in my case.

Having suffered heat soak so many times I felt I had to make the move to FMIC and have gone faster last year. Maybe not the FMIC cooler chage, but every little helps, and i need all the help I can get.

Interestingly, at the time nobody said fit a FMIC when I did my engine 3 years ago, so when a similar question is asked on here I chip in.
IMHO best to jump into the breach for a FMIC from the start.

Graham.

Floyd

iTrader: (9)

I'm not going FMIC ever! Just like John Banks once said.

F
PS what do you mean he went FMIC before he sold it

catons scooby

http://i131.photobucket.com/albums/p...n/DSC00020.jpg
http://i131.photobucket.com/albums/p...n/DSC00021.jpg

KIPS

Looking good Do you need to get it mapped now to get the full advantage of it ?

KIPS

catons scooby

i want a new turbo first,
then ill get it mapped,
cheers