hi,i will be fitting an sti8 tmic into my my99 and really dont want to change the bonnet scoop,if i have to get an sti8 undertray then so be it.what i want to know is has anyone done this before and kept the oe bonnet scoop? if so what is the best/easiest procedure to maximise the cooling but keeping the oe scoop?: if i do fit the sti8 undertray,will it need modifying/is there another undertray i could use etc etc???

 

hello?

 

you can fit the sti8 undertray but the my99 scoop is too small to allow the full benefit of it,so you`ll only get about 65% of its effiency

i fitted a 2003 wrx TMIC along with its undertray and fitted the sti8 scoop and the extra room for the air to get in is unreal

 

but is it that much better that it would affect the charge temps that much? will the 65% be sufficient enough to run 1.4-1.5 bar on vf35 to accomplish 340/340 ish? or do i actually need to something about it,i really dont want to be changing the look of the bonnet!

 

suppose it depends on how fast you go i guess if you need to fit the bigger scoop

 

at that tune front mount is your best bet

 

i already weighed up my options before parting with the money for sti8 tmic which would mean i am not going front mount! im just trying to find out my undertray options!

 

The easiest thing to do is get yourself a sti8 undertray, if you already haven't, and remove the diffuser from the top [ the planes that fit under the scoop]
This is easily done by drilling the spot welds securing it with a 8mm drill bit and it'll just seperate to leave you the flat undertray ....Then take your old undertray, place it on top off the sti8 one and centralise the two appetures and draw around the outline of your old tray then cut to size with a dremmel or similar, take your time to get this right....

You may need to drill a few new screw hole to mount to the underside of the bonnet, but you'll find quite a few also line up, as will the the rubber seal with the cooler when you shut the bonnet...

I chose to stay with the original look scoop, but one that is 25mm taller...The sti8 one looks on a classic IMO.

Try and get some pics of mine up for you when I can. hope this helps

 

it does help alot mate,thanks for that,if u could get some pics up that would be great,i now know i can keep the oe scoop!all of what u have said sounds very sensible and would make sense.thanks again,now lets see them pics!

 

That do ya

 

thanks for that mate,so im assuming u have just literally modified the sti 8 undertray and fitted that instead of the classic?

 

Thats the idea,same as what i did

to help some more












And the dreaded hated STI scoop

 

is that a top methanol funny car? the scoop is huge,just cant do that too the little green wagon! thanks for the pics mate.

 

no probs,it does save lifting the bonnet to remove leaves,i can fit my hand in there no probs and scoop em out

 

u could probably get an elephant to remove them 4 u..,so with keeping the oe scoop but modifying the sti8 undertray will i be benefitting to its near cooling potential?

 

upto a speed of about 100mph it wont be far off,but over this then no,as you can see the difference in scoop size it really does need the huge scoop,hence the sti8 having it