i've been offered one for nothin off of a mate who does drifting. its 630x300x76 does it matter how big or small they are as ive seen vrs fitted with all dif sizes. cheers :S

no not really to be honest

cool will grab it then before it goes to fabricator on the 19th then he may aswell do my pipework while its there anyone got a maf sensor tube they dnt need

get them to put one in when fabricating its only a hole lol

get them to put one in when fabricating its only a hole lol

no special lengths??? or does that not matter either?? if not sorted

dont forget that the bigger the IC and the longer the Pipe work the more lag youll have, specially if only using the piddly K03s, I iave a slight bit more lag with my Forge FMIC but not too much, I would say that if you have a really big IC then try make the pipe work as short as pos to reduce the lag.

Just get a large turbo on there lol, then there wont be a problem.

dont get that thugh billy maybe a very very small delay minimal as its a pressured system so the effects are minimal??

p.s forge size is the best imho the abd pipe last summer got warm to touch ask ally at unit 18 as his 200sx was still cold

will look into lengths while there to see which way is the best or shortest route

no not really to be honest

Poor advice

Increasing intercooler size larger than required for an engines CFM requirements may give no benefits at all, and can actually reduce thermol efficiency and harm performance.

If the core size is to big, then charge air velocity through the core can get too low, which leads to uneven flow and causes hot spots. Also on large single pass IC's internal syphoning can occure unless the end tanks are specifically designed to operate at much lower than intended charge air speeds.

If the measurements Sivrs has given 25"x12"x3" refer to the actual core size then IMO that is way too big for any KO3s..... if the core had been 1.5" thick (or at a push 2" thick) then it might have been OK.

One other point to consider is a 3" thick core will have a much greater adverse effect on ambient air flow to the air con and engine coolant radiator than one of the correct size.

HTH.

Poor advice

Increasing intercooler size larger than required for an engines CFM requirements may give no benefits at all, and can actually reduce thermol efficiency and harm performance.

If the core size is to big, then charge air velocity through the core can get too low, which leads to uneven flow and causes hot spots. Also on large single pass IC's internal syphoning can occure unless the end tanks are specifically designed to operate at much lower than intended charge air speeds.

If the measurements Sivrs has given 25"x12"x3" refer to the actual core size then IMO that is way too big for any KO3s..... if the core had been 1.5" thick (or at a push 2" thick) then it might have been OK.

One other point to consider is a 3" thick core will have a much greater adverse effect on ambient air flow to the air con and engine coolant radiator than one of the correct size.

HTH.

Totally agree here. When I built mine I went for a smaller one 24"x 6.5"x2.5" iirc. IMO this is perfect for the small K03s turbo, anything else is over kill really, and I didn't have to cut the crash bar.

Look at the ABD FMIC this is what I based mine on.

Edited 28 February, 201016 yr by vRSMart

i had the abd intercooler setup on mine and in the peak of summer the cooling was not as good as a larger cooler ask ally at unit 18 mine was warm to touch and his setup was cold

so work that out.......

its not jut about size though is it there are some proper crap ebay cores for sale that have been put together with no though on flow etc internally wich imo renders them rubbish

or am i wrong again

p.s i didnt look at his size i thought it was forge size but that will prob be way to big buddy thats cossie territory lol

the best size is prob inbetween the abd unit and the forge unit imo

p.s.s vrs mart only cut the bumper for looks mainly as it looks so much better

Edited 28 February, 201016 yr by westallc

Well I know for a fact that the smaller one on mine was good as i logged temps till the cows come home lol. Boost dropped a tiny bit but nothing a map tweak wouldn't solve and more importantly for every day driving there was no lag difference.

P.s cutting/drilling crash bars may void your insurance not to mention is damn dangerous to you and your family!!

End of!!

Edited 28 February, 201016 yr by vRSMart

the real answer is to size just big enough to keep inlet temperatures down to a sensible level in the worst conditions (hot outside ambient temp's). Middle 30's deg.C is a good place to aim for but 40 will be ok.

"big enough" means thermal performance, not neccesarily physical size. The difference in thermal performance can be huge from one core to the next, size for size. As mentioned there are some shockingly inefficient cores about, decent efficiency cores cost proper money, but occasionally you can get lucky with a cheap one that works. The likes of GRS Motorsport, Forge, Pro-Alloy etc will use proper cores and the price reflects that.

One option if you are very price conscious, is to use a bigger but less efficient (read "cheaper" generally) core if you have the space. Frontal surface area always wins over thickness - 3" imo is too thick and the rear part of the core isn't actually doing much as the air is too warm by then after passing through the bulk of the core to give much usefull cooling. 2-2.5" is best if there's a choice.

When all is said and done, only one thing matters (assuming airflow and pressure drop features are sensible - if not then fix that first) - core outlet temperature. There's only one way to be sure what you will get, measurements on the installation on the car. Any other data will be only indication at best.

Having said all that, Octy has no shortage of space, so a half decent FMIC should always be an improvement on the postage stamp SMIC fitted as standard, especially if it is a bit old with corroded surfaces and bent fins.

the sizes ive given is the overall size of the intercooler not the core. i cant find any dimensions for the forge and the abd unit to go off so i will give it a try it can only be trial and error i suppose

Having said all that, Octy has no shortage of space, so a half decent FMIC should always be an improvement on the postage stamp SMIC fitted as standard, especially if it is a bit old with corroded surfaces and bent fins.

Richm

I agree with what you have said but would like to point out just one thing re the std smic....

All air to air intercoolers be it smic or fmic work better when they are installed into a vehicle and have a properly designed ambient air duct.

Contary to what most people would think, the air duct should be of a reverse funnel design ie; with the smaller inlet facing the incoming cooling air (similar... ish, to what is fitted to the octy as standard). What effect this design does is to create a lower pressure at the intercooler core face than that at the inlet which helps eliminate reversion of the incoming amient air.

Often people dont seem to appreciate that a vehicle travelling at 60mph encountering road draft ambient air will only generate 0.06psi at the intercooler core face, and therfore there is a tendancy for the ambient air to try and go around the intercooler.... not through it !

I only pointed this out as I seem to read at least one post a month here on Briskoda about all fmic's being the "holy grail" of achieving lower AIT's and EGT's.... which is not always the case.

HTH