View Full Version : Splitter

7th June 2000, 19:25
Just received my splitter courtesy of


who is knoocking them out at a very decent price (they're worth twice as much!) and the quality and accompanying kit is superb.

I have only heard good things so far and mine will be installed at the weekend, so watch this space!!!!!!


[This message has been edited by sunilp (edited 07 June 2000).]

7th June 2000, 21:43
Imight do the same, but I am also fitting the original STi intercooler spray nozzle/piping assembly on my STi5 and fitting of the splitter may require 4 instead of 2 jets in order to reach in front and behind of a splitter.

We shall see what happens.


7th June 2000, 21:48
Hi Sunil,
I too received a splitter from mike, very easy to fit and noticed some difference in mid-range pull http://bbs.22b.com/ubb/smile.gif
Which design did you go for? i went for the 2nd version which is slightly wider it seems to put more air in the front of the intercooler IMHO. It must work because i now have dead flies over the entire i/c instead of just the back http://bbs.22b.com/ubb/biggrin.gif
I'll be interested in your comments.


8th June 2000, 09:17
Absolutely right about the 4 spray nozzles
Or if you could get a nozzle to produce a vertical curtain of MIST which would be blown into the scoop the splitter would do the necessary for you. IMHO i have only observed the sti water spray once and the droplets seemed rather large (thinking back to my school days ,Isn't it better for latent heat transfer [i.e. cooling]if water droplets are as small as possible !!)

mike f.

[This message has been edited by BladeRnnr (edited 08 June 2000).]

8th June 2000, 12:22

The water 'spray' on the ic/ as arranged by STi is certainly nowhere near the magnitude of mist I think we would be referring to. As it comes on some of the cars, it is a plain and simple 7 seconds of similar jet as you would have on you windscreen to clean it. Incidentally each assembly has two jet openings same as ones for the windscreen.

So, I will still most likely end up with 2 sets of nozzles 'in parallel or series' hoping this would not reduce an already coarse jet even further in intensity and character.


10th June 2000, 20:38
I have design number 2 courtesy of Mike and a little demon face to scare the flies with!

Still havent fitted it as too lazy,,,,,,,,,,,,,tommorow.........

Q, for the money its got to be worth it!!!!!!

PS....whats the next tuning step for my MY99 Q?

[This message has been edited by sunilp (edited 10 June 2000).]

10th June 2000, 21:40

As an astute person of financial education you are the last one I expected to succumb to the "it must be good for the money" illness. (joking).

What is the next upgrade for your MY99? Seriously? It all depends how long you want to keep it, ideally I would say the best upgrade would be to buy the MY2001 STi 8.

Of course, you might also want to buy P2,3,4, etc., etc. whatever is the current hit in the charts at the time. (joking?)

Give me a call or email and I will give you a few ideas which should keep you happy in the interim.

all the best


11th June 2000, 11:45

If you need a better spray pump get yourself along to a Peugeot (spit !)dealers and order a headlamp washer pump from a '91 405 Mi16X4
,I had one and the pump is so powerful that the headlamp washer system is designed to move away from the bumper which it is built into (ala James bond machine guns[Db5])and spray the headlamp clean and return into the bumper due to water pressure ONLY !!!

Now that is bloody powerful.Enough ,IMHO to produce with the right nozzle configuration,
a mist the amazon Jungle would be proud of ,or a cold wet day in Scotland !!

mike f.

11th June 2000, 16:30
Back on topic...

...I made one yesterday!

The biggest difficulty was obtaining some sheet metal to do it with. Most places, including some pretty serious builders merchants and heating engineers gave me the sharp intake of breath treatment.

Finally got some 22guage Aluminium sheet from the hardware store nearest my house (WC Baker for those who live in Hampshire).

Took about 30mins to make a cardboard template and about the same to make and fit the real thing. Seems to work, car is more responsive, especially part throttle.

As I have a LINK I suspect that this is because the map is just a little rich and any improvement in charge density will bring the car into the 'spot-on' range!

Mind you, at the same time I removed the intercooler guard which had metal guaze which was quite thick - so this could be some/all of the improvement!!!

http://bbs.22b.com/ubb/biggrin.gif http://bbs.22b.com/ubb/biggrin.gif


PS Metal sheet cost 2.90 for enough to make TWO - just in case I mucked up the first one.

PPS I got to play with a rivet gun!!!!

13th June 2000, 21:02
Ah, thats nothing........today i made a Evo 7 from two empty toilet roll holders, an empty bottle of washing up liquid and half a bag of blue-tack. Total cost 3 squids and i got to play with Carol Smileys wotsits!!

14th June 2000, 09:54
Yeah, Carol told me about you playing with her wotsits this morning http://bbs.22b.com/ubb/wink.gif

14th June 2000, 14:32

Be carefull there mate, sounds like you were using original equipment parts for a lancer... http://bbs.22b.com/ubb/wink.gif


14th June 2000, 18:14
he he,

On a serious note - dont you WANNABES understand the concept of "opportunity cost", thus your cost isnt necessarily 2.90, but all the time you spent going around buying bits and fuel and TIME - TIME you could have spent earning money or whatever - a much greater cost than you think - thats why i like to leave things like this to the professionals (i.e. Blade Runner) who researches, tries and tests his design and i get it for a lot less than it would cost me in lost time/earnings than if i tried to faff around and make it myself.

Be wise people!

14th June 2000, 19:12
Sunil, dude,

Haven't you heard about free time, hobbies, pottering about etc... Some people actually enjoy playing about with cars! http://bbs.22b.com/ubb/eek.gif http://bbs.22b.com/ubb/wink.gif


15th June 2000, 13:07
you forgot one vital part of time cost.....

The amount of time putting a plaster/band aid on the gaping wound/burn from trying (possibly too hard at times !!) to produce "Quality" not quantity.

I just try my best and hopefully people don't feel they are just another part of ripoff Britain if they decide to use me.


15th June 2000, 15:04
David, I'll give you 1.45 for that extra bit of sheet metal. In fact I'll give you 2.90 if you will make the splitter for me with it. Just think, you'd recover the entire cost of your upgrade, in effect making it free!
(Needing all the help I can get to stop engine exploding)

15th June 2000, 19:43
dopey how is he going to recover the entire cost when he has to make it all over again and 2.90 never covered the true cost in the first place - you northern moneys! http://bbs.22b.com/ubb/wink.gif

15th June 2000, 22:12
Allow me to ask what is the purpose of this useless "dialogue" that has been going on between some of you here?

Are we here to learn about the splitter or to which degree of cheapskating those of you who are so inspiring have eleveated yourselves?

thank you for your atttention


[This message has been edited by quattro (edited 15 June 2000).]

16th June 2000, 07:18
'Purpose'? Good old fashioned fun. God forbid we should try to inject some humour into this thread. And you cracked the first joke on this thread, I'll delete my post if you delete yours.
I'm still waiting to hear Sunlips results. I am genuinely interested in the reported effectivness of the product, my 22B UK has detted on the rolling road and I would like to do everything possible to reduce risk of this incidence. Clearly I am not going to install a home made Blue Peter version of the splitter, I have no interest in playing with sheet metal AND I'm always happy to pay for the best available version of a product.
With regards to the waterspray, hopefully the increased efficincy of the design will enable the same flow of water to be split into 4 jets and still produce better results.

16th June 2000, 07:58
RRTFLMAO http://bbs.22b.com/ubb/biggrin.gif http://bbs.22b.com/ubb/biggrin.gif

I'm a bit worried 'cos I with Moray on this one http://bbs.22b.com/ubb/wink.gif

My observation was not that you could potentially save 20 - 2.90. It was merely that I had an enjoyable experience making something for may car that actually did something for it.

According to Sunils calculation, in terms of

time (let's use my business rate just to realistic)
capital investment in plant (rivet gun which I have always wanted)
waste (Chuckster we can negotiate)
fuel (going to get the bits)

the total cost of this development is around a conservative 700.

So, I have offended the manufacturer of this 'product' then that was not intentional. I am sure that the purchased product is vastly superior to mine in every way - but it could well not actually fit my car - STi has a different intercooler to a MY99.



16th June 2000, 09:01
Sorry, Charles, I thought this type of "good old fashioned fun" was something Scoobynet was dealing with. But, thank you for making it crystal clear - I understand now!

And God forbid there was no fun on 22b.com. I just have a bit of a problem making a distinction between good, old fashioned fun and what I objected against. I have no reason to delete anything and neither do you. That would be exactly in the spirit of what I am against.

On a more "serious" level, though, it would be nice if a splitter and/or water spray onto the intercooler could resolve detonation problems you have reported. Unfortunately, they will not.

Good luck and have fun.


16th June 2000, 14:02
Dear All,

I stand corrected - apparently the splitter that Sunil kindly enlightened us on will fit a MY99.

So that's me wrong again http://bbs.22b.com/ubb/tongue.gif


16th June 2000, 15:24

It would be bad of me to agree with you now, wouldn't it?! http://bbs.22b.com/ubb/wink.gif http://bbs.22b.com/ubb/smile.gif

Enjoy the heatwave guys... I'll be hiding 'till dark (or melting at the CC track day tomorrow).


16th June 2000, 17:04
Then there are some of us who fit water injection as well as water spray, to cool things down when ambient temperatures rise. Just a pity that the intercooler on the older cars isn't that brilliant..... oh well, perfect excuse to try to make a P2000-esque intercooler :)



16th June 2000, 18:39
Rannoch there was no offence mate......
(i Was going to ask you to subcontract.....at that price)

The definitive information about splitters was gained from an australian web site where a splitter was tested (std car,std+splitter,std+waterspray, std+splitter+waterspray)
air temps were taken @
ambient (i.e. before entry to filter)
From outlet of turbo
outlet of intercooler
The STD intercooler showded an efficiency of 84.2%. (NOT BAD !!)
The splitter yielded a 4degree celsius Reduction which eqated to a rise in intercooler efficiency of 4.2%(88.4%)

If this was used in conjunction with Water spray (i assume 4 nozzles)
reduction in temperature was 8 degrees C -efficiency rise of 8.4 % (92.6%)

As everyone knows the splitters help direct some of the cooling influence to more of the intercooler ,thereby increasing its efficiency. Ergo charge air is cooler + denser (more o2)= better burn .

It is probably cheaper ,easier(and less damaging to warranty , or less lag)to fit a splitter than a front mounted intercooler.

If anyone wants the full info test it goes onto about 4 pages.and can be found at

mike f.

16th June 2000, 19:19

Do splitters count as a 'performance mod' for insurance purposes?


18th June 2000, 08:54
Oh good was have I done http://bbs.22b.com/ubb/eek.gif

Are you lot absolutely sure that the 'splitter' is honestly making a difference?

If we are talking about the same thing (the one based on the drawing on Steve B's site, which I did...)

The only difference that I've noticed with it on and off the car, in the same day, is that with it fitted my bonnet vibrates more at speed!

It has done NOTHING to aid performance as far as I can tell.

The downpipe, well that's a different matter...pop pop pop bang, crackle crackle bang bang... http://bbs.22b.com/ubb/biggrin.gif

19th June 2000, 14:02
Mick...........(gallic shrug..mate !!)
I don't know i only make them ......I wouldn't thought performance ,more ....."enhancement of efficiency of the intercooler to aid engine temperatures"
(any by product to that is a bonus.....)
I have not really said you get a performance increase ,but an increase in the efficiency of the intercooler.
Quote that to the insurers ,should be o.k.

mike f.

When it is cold and damp ,IMHO it seems to "snatch" a bit (a bit mind not loads...)when you apply the accelerator hard.

Whether or not this equates to a performance increase or some brain fooling the body effect i have yet to determine.

20th June 2000, 12:50
I noticed better 'pull' in 3rd and 4th gears between 4000 and 5500. But as Mike says - a bit not loads!

20th June 2000, 14:28

I wonder what gains I would get fitting one ? http://bbs.22b.com/ubb/wink.gif


20th June 2000, 16:41

fitting a splitter to your car will cause a reduction inintercooler efficiency. This is due to the extra lift caused by the splitter causing the front of the car to rise. This will upset the entry-angle of the air into your intercooler and reduce flow...... by about one millionth of a percent... http://bbs.22b.com/ubb/smile.gif http://bbs.22b.com/ubb/smile.gif



20th June 2000, 18:04
cheers pat..

so.. does that mean I shouldnt fit one ? lol


20th June 2000, 18:32
yes you should Jay becoz the lift generated at the front will offset your lardy physique in the drivers seat! http://bbs.22b.com/ubb/wink.gif

21st June 2000, 15:38

Go ahead and fit the splitter, at least it may increase cooling of your gearbox, which can't be a bad thing http://bbs.22b.com/ubb/smile.gif



22nd June 2000, 22:49
oi munchin...

you are callin' me lardy ?

Pat... I could also thermally coat my box.... when my titanium housing arrives.. but dont tell anyone http://bbs.22b.com/ubb/wink.gif


23rd June 2000, 00:40
Firefox is a physical lightweight and an intelectual heavy weight http://bbs.22b.com/ubb/eek.gif

23rd June 2000, 09:26
Forgive the ignorance folks, but having followed all the links and read all the thread, I still havnt SEEN a splitter. Can imagine what it looks like, understand what it does (turbo cars are ALL about flow management, be inlet/cooling /or exhaust) but can someone SHOW ME THE MONEY (SPLITTER)!!...please....

23rd June 2000, 15:22

what you do with your box is a personal thing.... http://bbs.22b.com/ubb/smile.gif But on a more serious note, surely HPC coating the gearbox is perhaps not such a good idea.

As for the "shape" of the splitter, think of an extra aerofoil half way up the scoop, which defelects air from the lower half of the scoop to the front of the IC, and allows the rest of the air to enter the rear of the IC....



23rd June 2000, 17:15

you can see BladeRnnr's very own handywork at: http://www.tab.demon.co.uk/boomer/splitter/index.html


24th June 2000, 20:41
The splitter should be painted in 2 pack paint matching the bodywork with 20 coats of high gloss lacquer. It should then be baked at 225 degrees C on the top shelf for 30 mins, turning once. Then allow to cool and smother with several coats of Zymol (after HD cleansing!)

The effect is that the coeffcient of drag will be so good that the air will enter the intercooler in exact proportions at warp speed (captain!)


26th June 2000, 09:26
Txs Boomer, just what the docter ordered.

26th June 2000, 20:35

2nd July 2000, 10:32
Sunil .......thre's only 36 hours in a day !!!!!

when would i have time to do the 2 pack paint,hpc....etc. http://bbs.22b.com/ubb/wink.gif

anyway your wrong....... i'm going to coat mine in USAF SR71 "Ironball Black" which should dissipate any radar energy from Gatso's......

Byeeee !

p.s. Anyone famous want one (j.)?

[This message has been edited by BladeRnnr (edited 02 July 2000).]