I don't think his asking why MR2's don't run front mounts. He is asking how effecient the intercooler is compared to a front mount.
 
QUOTE
"First thing i would like to know is how effective is the intercooling system compared to a front mount? "
 
Then goes on about wanting to run 18-20psi and being worried about intercooler efficiency for running this.
 

He's asked a question, and most people on the forum like to help. If you just want to shoot him down, that's your perogative.
 
To me, its quite clear he's approach modifications to the MR2 the same way as a FR car (e.g. s15) where you just up boost, bang on a front mount and happy days you're good for 250rwkw, which has lead to his line of questioning. How's he supposed to know if the Gen2 turbo doesn't support 18psi if he has no knowledge of the car?
 
Perhaps he's asking the wrong questions, but if he doesn't have any experience with MR2s, then that's only natural.

I don't think my response was shooting him down. I saw a lot of responses going on about intercoolers and no one had mentioned anything about the stock turbo and other components limiting his end goal.
Wont help him very much if he bangs on a bigger side mount or W2A intercooler then realises the gen 2 doesn't go 20psi so easy. Like I said in my very first line "I'm really confussed by this whole post".
 
 

the reason why i questioned the intercooler efficiency is because it seems to me that it is stored away in the engine bay and wont be prone to any cold air rushing through it. I realised already before i posted that i cant stick a front mount on this car.. so im sorry you guys got the wrong idea.

I read around that 18psi will be the stock fuel injectors limit and i have kept that in mind. My question on the BOV is purely about personal taste, like many others i like the sound the VTA BOV makes.

And who are you to question why i want a 'high horsepower vehicle' and only boost a few times a day... i have my reasons, one off which is that when i want power it is at my disposal. And yes i did think off the 3s-gte as a engine where you just crank the boost much like a 2jz-gte..

Having said that what should i do to achieve factory fuel injector limits?

Many thanks.

-Dien

Firstly,
Welcome
 
Secondly
A search on the forums is the first thing you need to do before asking questions, all the questions you have asked have been asked before and have lots of replys to help you out initially, then armed with some knowledge ask questions about the doubts you have.
 
Thirdly
You being a newbie should atleast try and refrain from questioning the responses from the older guys regardless of wether it doesn’t make sense or not as there may be other reason you don’t know about that influence the outcome of said questions and answers…(this is where the search will help you too)
 
Now..
The intercooler on the stock sw20 isnt too bad, if your going to run higher boost then the cheapest alternative is to buy the intercooler kits from ebay (greddy knock off) buy a thermo fan, a block off plate and shroud (if you can find any) and that should take care of cooling (ebay cooler kits have **** silicone joiners and clamps so you will need to update them) also do not try to run the cooler without a fan as it will heat soak a lot otherwise…..
Ps – if you have no idea why a thermo fan and block off shroud is needed when upgrading the cooler do a search…..
Also changing the intercooler is one of the worst jobs ever….
 
 
Working on the engine bay, well if your short like me then it’s a PITA. But its not impossible and many people who own the SW20 including myself work on it themselves.
General maintenance like oil and filter change (oil filter on  gen 2 will give you some grief) plugs leads etc are quite easy to do.
 
 
The 2^nd Gen turbo does not have a MAF, it runs a VANE TYPE AFM
The reason your supra was not running well with a Vented BOV is due to the fact it has the same Vane Type AFM.
Im guessing you have the 1g-gte engine in your supra, the 7m has a different type of AFM and will run much better than a 1g-gte with a vented bov.
The reason the car runs like **** with such BOV has already been explained, so I wont bother going into details.
There are ways to get around this, but its expensive and includes running a new ecu, tuning etc.. the best way is to buy a GEN 3 as already mentioned.
(when I had my gen2 I could still hear a small amount of plumback noise when I had a pod filter installed, but its not loud enough, I have now converted to a apexi PFC and have my BOV plumbed back and its still LOUD)
 
Daily driving this car is probably personal choice, I used to in my gen 2 and never had issues. Be aware also that this car is not like any other RWD turbo and will make you learn to drive it, treat it like a normal RWD car and you will be crying before you know it (SPECIALLY IN WET WEATHER)
Ps- don’t bother putting some **** tyres on these cars and expecting it to handle properly either
The second gen turbos also had a issue with synchros on the 2^nd and third (mainly due to wear and tear and old age) so make sure you get one that has a good box
Make sure the cooling system is in good condition. A neglected cooling system will give you grief in ways you never knew possible
The targa top version will leak no matter what the seller tells you (unless you get reaaaaaalyyyyy lucky)
Most SW20s have been written off in the wet just so you know. So be carefull in wet weather with them.
Also Don’t buy the cheapest Turbo you see, you will end up with more
 
All the best with it mate.

i almost forgot
300hp on a stock car even with 20 psi on a ct26 is not gonna happen...

In regards to running a vent to atmo bov on a gen 2, my opinion on this is that it is somewhat okay to do providing you tighten up the bov so that it only opens at higher pressures. So in light throttle / low boost situations the valve won't open. 
It will still possibly puff a little black smoke from the tail pipe when it opens.
 
I think the main problem with a bov on a gen 2 is the situation where you boost, foot off the throttle and clutch in, bov lets the air out, engine returns to idle, then drops below idle and stumbles. I'm pretty sure this is the main annoyance with the atmo bov. Tighten the bov right up and it won't stumble when it gets to idle.
 
Its been a while since I owned a gen2 with a bov so my memory could be going, anyone care to comment on the above?
 

firstly thanks purple5ive, the information given by you was helpful. 

Im a tad concerned about the wet weather scenarios, how bad exactly is it? because from experience i know that the back off the car kicks out when i turn and give it some gas...

The handling is really not as unforgiving as some people make out. Even in the wet, I've never had any major issues, and thats with the early suspension which is meant to be worse.. Approach it sensibly and you'll be fine. The rear weight bias actually gives you more grip under power.
A BOV will not work very well with the Gen2 with stock management. Atmo venting ones are for **** factor only, not to mention illegal in most areas. If thats a dealbreaker for you, I'd rather you avoid MR2s anyway.
Yes, the stock intercooler placement is not as capable as a big front mount. That's a fact of life for a mid-engined setup. However, there are still several options for supporting higher power, rigt up to crazy levels. I'm just finishing my Water to Air setup right now.
Working on them, somethings are easy and some are hard. Most are hard. Can be so frustrating, but it makes it more fulfilling.

Google the '3SGTE Power Primer'. Gives all the info you need for huge power.
SW20s need a different approach to most Jap Turbos, which is a little more difficult in most cases. But the upside is a more unique car that can be a lot of fun.

My friend ran a BOV vented to atmosphere for a few years on his Gen2, no real issues apart from a bit of black smoke on gear changes.  Otherwise car ran fine.
 
Re the handling.  Its not as unforgiving as a typical front engine/rear driver, especially if you are not smooth with your inputs, but its not that bad as others have said.  Take it to a track where you can explore its limits and you will learn its behaviour.
 
They are a great and quite unique car.
 
Cheers