i just bought a supra

i just recently bought a 1990 supra turbo, i was looking for a mr2 turbo but ran across this deal and was satisfied with what i saw. the body is perfect and the paint as well, the guy was asking 5 for it sounded like a deal and also had a jdm engine with a new turbo. i took it to a shop to get it checked out and it has a serious leek in the power steering pump and also the A/c doesnt work, and the head gasket is leaking so the guy drop the price a G. do u think this is a good deal or bad?? also do they have blow off valves or recirclating valves? thanks

$4K is steep at best for a barely running MK3 that's going to break down soon. If you think it's worth it then it is because anything is only worth what you think it is, but I would only pay $2K-2.5K assuming the body/interior is perfect and that's just because its a 90. A JDM engine should only cost $600, but he should also realize he will not get his money back from that. MK3's have recirc valves, an atmosphere vented BOV is aftermarket only.

it's not as bad as it sounds and it runs great, we drove it and it feels good.

what is a recirc valve ? does it make the popular PSSHHH sound??

A recirculate valve is just that, when it releases the pressure it recirculates it back into the turbo inlet after the AFM so no metered air is lost. An open air BOV vents the pressure out into the open, any BOV will make a pshh sound but it's much louder with atmosphere BOV's.

whats better , a recirc valve or an atmosphere BOV

an aftermarket bov is better

Talk him down... 6000 total... that's almost the book value for a perfect condition supra.

i thought bov decreased the cars perfromance from the stock bov due to not measuring the ammount of air being released.. aftermarket bov's are for the sound and the decrease in performance is unnoticeable

To each, their own.

I'll never understand why people are sooo worried about other people.
Frankly, I do not care what other people do to there cars (or WHY they do it!), unless I can learn something from them.

As for people who do things that I do not like ... so be it. In my opinion, they just make me look better. I would hate it everyone had the exact same taste.

That being said, I was just as guilty as anyone for buying BOVs because they were "cool" and I bought into that they increased performance, etc ... but the bottom line is, I am interested in performance. PERIOD.

That being said I would like to clarify a few things:


The OEM valve does not give you a gain inperformance since you already OWN it. Paying $250+ for an aftermarket valve will cost you performance.

Real racers are interested in squeezing every possible ounce of performance out of their cars. I am lightening Hyde over the winter and one of the pieces I took out weighed less than 3 lbs. Is that going to give me drastic improvements? Hell no. But when you figure I have takev out of 10 pieces that weigh less than 3lbs, you are talking about close to 30 lbs ... added to other items that I have changed, modified or removed and I am looking at close to 150 lb weight loss. I should be over 200 lbs by my first race day.

So at what point are you "ok" with paying money for parts that you know are inferior? If it cost your 1 HP? .... 3 HP? ...10 HP?


I am speaking from 10 years of expereince of owning/modifying/racing turbocharged MR2s thank you. I have tried several BOVS and have all kinds of wonderful problems (screwed up idle, valves getting stuck open and let me sit on the side of the road, power on shifts not being as smooth, running rich, etc). I paid a good $$$ to have my car dyno tuned ... I am not about to throw that out of whack for a cool noise.

To each their own.

They are great cars, if taken care of. You got jipped for $4000 for a Supra with a blown head gasket though. Take care of the head gasket and it is a very stout car.

i thought bov decreased the cars perfromance from the stock bov due to not measuring the ammount of air being released.. aftermarket bov's are for the sound and the decrease in performance is unnoticeable

Stock BOV is not a BOV, its a bypass valve. It recirculates the air that would be blown off back into the intake. Blow off valves DO NOT give/take power to/from your car. The only reason it would take any power is if it was set up incorrectly, i.e. not compensating for blown off air with tuning, therefore running rich. Aftermarket blow off valves are NOT just for the sound, they are to withhold more boost pressure. Also as stated, there is no performance decrease if set up correctly.

i thought bov decreased the cars perfromance from the stock bov due to not measuring the ammount of air being released.. aftermarket bov's are for the sound and the decrease in performance is unnoticeable

There is no decrease in performance with aftermarket BOV. The only way "air" would not be "measured" is if you were to vent the stock recirc valve to the atmoshpere, creating an almost unmanagable vaccum leak. Because the recirc valve is always leaking a small amount, even at idle.



That is a little steep for the mk3. The seller will be getting the good deal.

my advice is dont buy it if it has problems and, if you already bout it then repairs arent very expensive just make sure when repairing to use performance parts head gasket,radiator and, oil cooler all can be bought from hks,pwr,fluidyne,greddy,etc...

My following comments are based on the OEM MR2 BPV:

There is no decrease in performance with aftermarket BOV.
The way a BPV/BOV's performance could be measured is how quickly it opens and how quickly it holds. Secondly, it's ability to hold shut unde boost pressure.

That being said, aftermarket valves (except for the HKS SSQV) do cost performance on both counts.

Because the recirc valve is always leaking a small amount, even at idle.
The OEM MR2 valve can not leak under any condition unless it is broken.

The only reason it would take any power is if it was set up incorrectly, i.e. not compensating for blown off air with tuning, therefore running rich.
As I pointed out above, it could also rob you of performance if response time is not as fast as it could be ... which is the case with aftermarket spring-based valves. So yes, they can rob you of power (not peak power, but part of your power band).

Aftermarket blow off valves are NOT just for the sound, they are to withhold more boost pressure.
Actually, all spring-based BOVs WILL FAIL under enough pressure.
The OEM MR2 valve can not. The more boost you run, the tighter it holds shut since it is based on air pressure differential.

Also as stated, there is no performance decrease if set up correctly.
Again, I disagree. See previous comments.

The Problem with Spring-designed BOVS
If you adjust them to loose, they will open under pressure (leak).
If you adjust them to tight, they will not open under lower boost pressures (during normal driving, average boosting ... not WOT driving).
The point of a BPV/BOV is to stop pressurized air from trying to run back against the compressor wheel. Don't know about you, but I want it to work just as good at 5 psi as it does at 25 psi.

So thats why some people use 2 BOV's?? Would bleed fast but seems you would double the chanced for failure.

I can't disagree with your statements. But one thing I know for sure is that my recirc valve (mkIIIsupra) leaks a little bit all the time, however I do not know for sure if the valve is/was working properly...

There is no reason to use 2 valves.

It's not a matter of how fast it actually bleeds the air, it is a matter of quickly it responds to bleed.
A device based on a spring can not repsond as fast as one based solely on air pressure.

Also, the OEM MR2 valve responds to the slightest change in air pressures so it is incredible repsonsive.

JekylandHyde, if you don't mind me asking, what does your mr2 weigh?

JekylandHyde, if you don't mind me asking, what does your mr2 weigh?
I don't mind ... I have no secrets.

Hyde currently weighs 2675 lbs without me in it.
I am having a Borla Muffler and some pipes added today so it might get close to 2700 lbs now.

I will be required to weigh the car this weekend at the NHRA event if you want an exact reading then.

Sure, that would be interesting.. I was thinking they were lighter. That almost scares me into not weighing my mkIII hehe.

What does your interior look like? Hulled or still street looking? [i know this is off subject, oh well.. just pm me if you dont mind]

Interior here:
http://www.jekylhyderacing.com/rollbar.htm

The floor carpeting is back in the car.
It's a full interior minus the stereo system.