1990 Gen 1 SW20 Vent to Atmosphere?

[blackmk3]

i think you need to so some reshurch on what BOVs are what they do and how they work....then you would be deciding wether you like compressor surge or a pshsssst.....but then you start the saga of blow off valves...

[solitaire]

i think you need to so some reshurch on what BOVs are what they do and how they work....then you would be deciding wether you like compressor surge or a pshsssst.....but then you start the saga of blow off valves...

? Explain... i understand the basic principals of what they do... at the end of the day wether the excess air is vented back into the intake or to the atmosphere seems to be fairly mute performance wise... dont you think?

[solitaire]

Hey, Got it working...

Went to Ash Air in glenfield (by recomendation of a toyspeed member) ... awesome people... they came out with a screw driver and helped me find the right parts... very helpfull guys and very cheap for what you get... i highly recomend them... all up cost me about $25 and works a dream...

just got the 1 way value and plumbed it up, blocked of the re-circ as instructed by you guys... and bam... woosh noises and no stalling....


awesome, thanks boys

[mr2matt]

Seriousely dude...
Pay some attention to what fivebob and blackmk3 are telling you.
You can't vent an AFM'd engine to atmosphere without consequences.
The AFM measures the air as it enters the ensure and calculates the fuel mix accordingly. By letting the air escape after the AFM you're throwing the calculations off. The only way to do this successfully is to install an after market ECU with a MAP sensor. FYI the Gen III's run a MAP sensor stock which is why they can vent to atmosphere.
Your best bet is to remove the stock air box and fit a pod filter, preferable in a cold box. Along with helping the engine breathe better it increases the induction noise and lets some of the factory bov noise through.

Otherwise if you just like the noise just buy one of these.

http://www.takakaira.co.jp/accessories/ ... pager.html

[FST4RD]

Well done Solitaire!!!
It does work, i done it on 3 of my previous cars with no consequences and my friends 4AGTE who has the same thing had it on the hub dyno the other day with no problems at all.....

[solitaire]

Seriousely dude...
Pay some attention to what fivebob and blackmk3 are telling you.
You can't vent an AFM'd engine to atmosphere without consequences.
The AFM measures the air as it enters the ensure and calculates the fuel mix accordingly. By letting the air escape after the AFM you're throwing the calculations off. The only way to do this successfully is to install an after market ECU with a MAP sensor. FYI the Gen III's run a MAP sensor stock which is why they can vent to atmosphere.
Your best bet is to remove the stock air box and fit a pod filter, preferable in a cold box. Along with helping the engine breathe better it increases the induction noise and lets some of the factory bov noise through.

Otherwise if you just like the noise just buy one of these.

http://www.takakaira.co.jp/accessories/ ... pager.html

Mate, So far ive heard full (and very helpfull) instructions on this post on how to do it.... and a lot of people saying it wasnt designed to be done that way....

i posted a reply saying as far as i can see all im doing is making the mixture slightly richer on gearchange.... no more air is getting it after all... just more fuel... and no one commented on that...

all due respect but saying that i cant do it without consequenses but not actually saying what the consequences are is not very helpfull at all....

I have repeatedly asked posters to be more specific on why this shouldnt/couldnt be done and the only person who has gone into detail is someone who has told me how to do it. No one who has said i shouldnt do it has actually answered my questions as to why its bad... other than "its not designed to do it" etc... nothing technical... and without anyone actually being technical all i can think is if anything, its getting less air than before... meaning by my limited logic that its gona run slightly rich, which isnt ideal but wont melt the engine....

Please, correct me if im wrong... if there are going to be consequenses... please... share them with the world.... why would you keep that information to yourself?

[solitaire]

Well done Solitaire!!!
It does work, i done it on 3 of my previous cars with no consequences and my friends 4AGTE who has the same thing had it on the hub dyno the other day with no problems at all.....

Thanks mate... awesome instructions.... it was amazing how interested the gas fittings boys were... mind you i suppose its a change to compressors etc...

I even went to hammer hardware and bought a 90degree joint so it spits the hot air out the engine cover rather than all over the pod filter.... probably doesnt do anything but im happier knowing that cold air if going in the engine... that whole recirc thing never sat well with me...i mean.... spitting warm air back into the engine.... it just doesnt seem right.... kinda like shaving kittens or paying taxes

[mr2matt]

As far as I know that is correct and you're unlikely to have any serious side effects by doing this but i would have expected this to hurt performance.

Here are the comnsequences that I was speaking of - sorry for not stating them earlier, I hadn't read all of the posts fully to see if they had been mentioned.

The running rich at gear change will cause the engine to drag pulling out of gear changes.
Closing the bypass valve forces the engine to breathe through the turbo compressor when off boost which is less than ideal

If you're not noticing these problems or the increased noise is worth it anyway then that's cool. I'd reccomend you look into getting an aftermarket filter too as this makes some great noises and does improve performance a bit.

[solitaire]

As far as I know that is correct and you're unlikely to have any serious side effects by doing this but i would have expected this to hurt performance.

Here are the comnsequences that I was speaking of - sorry for not stating them earlier, I hadn't read all of the posts fully to see if they had been mentioned.

The running rich at gear change will cause the engine to drag pulling out of gear changes.
Closing the bypass valve forces the engine to breathe through the turbo compressor when off boost which is less than ideal

If you're not noticing these problems or the increased noise is worth it anyway then that's cool. I'd reccomend you look into getting an aftermarket filter too as this makes some great noises and does improve performance a bit.

Ahh, cool thanks mate i understand now... bit new to this...

it gets a bit unhappy when half boosting (ie.. pushing the accel very lightly) goes really rich i think... planting boot solves issue as you would expect...

It had a nasty cheap pod filter on it so ive put a k&n on it and relocated it to the left air intake... it does sound cool

to be perfectly honest i expect i will get bored of the noise in a few months and put it back... but you breathing through the turbo comment is very interesting....

the thing i do like is the fact that it no longer makes a farting noise when it re-circulates... primarily because it doesnt recirculate... yes... it actually sounded like a big nasty curry fart... =)