stevie1982

iTrader: (16)

Just a quick one what are these rated to?

at what point is it best to go for a fmic

philhasasti

think these are good for about 330bhp maybe slighty more?
im running 330bhp on my standard intercooler, and its fine!

mit

iTrader: (10)

Yeah, I've got an Sti V6 tmic, fitting 550's at the end of the month, mapping by JGM who said that would be OK, but at it's limit really(330-350bhp)

STI_Baly

iTrader: (23)

350BHP is really at it's max and it's not advisable to have this at it's max.....You may want to just consider an FMIC if your planning 350BHP anyway?

joz8968

iTrader: (13)

Does anyone know what bhp the OEM v.3/4 silver STi TMIC will allow? Can a MY93-96 early bonnet undertray be made to direct the air to it properly? Anyonew done this?

mit

iTrader: (10)

I can't see it being a problem. I fitted a facelift bonnet, along with the Sti V6 tmic, the undertray needed extending back about 2"-3". No major hastle. Why not fit a V6?

joz8968

iTrader: (13)

Ha I knew you'd ask that.

According to Autospeed's flow bench testing of various TMIC throughout the years (up to Bugeye at the time), IIRC the v.3/4 STi one came 2nd to the v.7 STi one (of all the OEM TMICs, that is). Despite the v.5/6's larger core, it compared unfavourably in the flow rate stakes, IIRC.

mit

iTrader: (10)

I've just had a read of that test again, and it's a funny one. They never tested the Sti V5/6, only the WRX with the plastic y pipe.
Also, I've just copied this from the summary:

'Note that if your primary consideration is charge-air cooling, the Version 5-6 and Version 7 WRX intercoolers appear the most thermally efficient of the air-to-air OE parts - the Version 5-6 intercooler's flow, however, is very poor'

So, i wonder, in real use, how these would compare? I don't know!! Thermal efficiency or flow?

joz8968

iTrader: (13)

Yeah, a tough one . The larger core (to cope with heatsoak) of the 5/6 appeals (but also will take longer to cool back down again). But the reasonably effecient higher flow rate of the 3/4 presumably would translate into more potential bhp Damn!

The only other considertion is, would the 3/4 replace my 1/2 slanty much easier than the 5/6 (i.e. is it not so deep, etc.)?

How did you get on fitting your 5/6 one, mit?

mit

iTrader: (10)

Looking at the 3/4 tmic, the only problem i can see is that dv pick off hitting your idle control valve?
The 5/6 was easy enough, you need a early slanty samco i/c hose, cut down to fit the sti y pipe, and i cut the lip off the throttle body and i/c for a bit more clearance.

STI_Baly

iTrader: (23)

And then don't forget the undertray issue, as apparently this is needed to make it further efficient.

I have never done the undertray or seen it done properly so cannot comment Joz.

joz8968

iTrader: (13)

Cheers both/.

Yes, the 3/4 BOV pipe could be an issue. But good news on the 5/6 one, as I think you have to grind 5mm off the 3/4 one (and TB) anyway! Therefore as mit says, prob easier to fit 5/6 then.

Yeah, aware of undertray and will have to sort something for the interim.... but do indeed intend to get the v.3/4 (or 5/6) wih their respective undertrays later, anyhow (already have the 3/4 headlights and 5/6 grille waiting to go on ).

mit

iTrader: (10)

The undertrays an easy 20min job, just needs the rubber guide opening out as said, but only on the facelift bonnet. I imagine the pre facelift being more work, as the standard undertrays all wrong being slanty.

joz8968

iTrader: (13)

Ah of course... because either the 3/4, or 5/6, IC won't be sitting directly beaneath their respective bonnet/undertray, when they're fitted to a v.1/2 deeper throttle body - is this what you mean?

STI_Baly

iTrader: (23)

I belive he's trying to say that on the V3/4 you would only have to do minor adjustments to fit v5/6 IC. But with the pre-facelift which you have the modifications to the undertray may be considerable due to the deeper throttle body as you said.

I think you should just fit it and try and adapt something yourself, usually very easy.....you could even use fiberglass and custome make it??

Baly

mit

iTrader: (10)

the face lift bonnet's scoop is much deeper than the pre face lift, meaning less air can be directed to the intercooler. This means it is never going to be ideal, even if the tray is modified. The bonnets were facelited when they fitted bigger intercoolers for a reason, bumpers followed later. I picked up my bonnet for £150, in white so no paint needed. Looks better too!

joz8968

iTrader: (13)

Yes, I'm aware that you'd ideally need to fit either a 3/4 or 5/6 bonnet too, for its undertray to match its respective IC.

But are you saying that even when you do this mod - i.e. both IC AND its bonnet tranplanted onto the v.1/2 - that you STILL have to modify the undertray a tad to make it 'cover' the IC correctly (presumably because the early, deeper TB throws the IC out of kilter a little)?

mit

iTrader: (10)

yeah, the intercooler sits a little further back as you say. I'll post a pic tonight of the undertray if you like?

joz8968

iTrader: (13)

Cheers mit, that'd be cushty .

Did you have to also contrive any extra bracketry etc. for the IC to fit?

mit

iTrader: (10)

Hi, taken a few pics:
Under tray,you can see the row of holes that the rubber surround used to fix to, i moved it back, and added a couple of inch's to it.

The Sti 6 tmic fitted. You need to move the loom under it a little, and bend the metalwork under the gearbox brace a little.

Blanking plate fitted over existing DV mount, sealed and bolted:

I managed to get the Sti 6 mounting brackets with the i/c, and adapted the passenger side like this:

And used the existing mount from the V1/2 tmic. I had to take out one of the two bolts holding the mount to the gearbox, so i could move it a bit:


You can also see how short the i/c to throttle body pipe is, and the clearance to the bulkhead. And, as I'd cut the lips off the pair, the mounting brackets stop the i/c moving back under high boost.
Also, the i/c doesn't leave any room for a strut brace if you have one.
Sorry i don't have any pics of the back of the i/c.
Hope this helps!

joz8968

iTrader: (13)

Thanks a lot - very illustrative/helpful!

I see you're reusing the OE dv - is the silicone hose that goes to its inlet side tapped into the the IC Y-pipe's silcone turbo elbow, then?

mit

iTrader: (10)

Yes, it's a samco V1/2 hose, which has the standard DV outlet.

joz8968

iTrader: (13)

LOL, Oh yeah, you mentioned the WRX IC pipe kit earlier (where you have to cut the turbo pipe down to fit the Y-pipe in the correct position) - sorry

mit

iTrader: (10)

This is the baby! I got mine second hand for £15, bargain!
You need to cut it just after the elbow.

Samco Intercooler Hose Blue Impreza 92-96 Scooby Turbo Subaru Impreza STi WRX Parts Lancer EVO Manifolds Turbo Intercoolers - Flat4online.co.uk

joz8968

iTrader: (13)

Yes, I bought the kit to do the WRX corrugated inlet pipe-delete mod... but got a STi v.2 TMIC insted, with it's metal pipe and silicone turbo hose (like the one in the other thread that we've benn talking about lol). So I flogged the kit on.

BTW, how did you mamage to snare tha kit for ony £15?! As you no doubt know, you can pick 'em up for about £35 on eBay - that's the cheapest I've seen 'em at.

mit

iTrader: (10)

Just luck i spose! Look at my profile, those wheels cost £102 with good falcon tyres(changed now), off ebay. There are bargains to be had!