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  Soarer Central * Mechanical - TT * Turbo Talk * A few questions - boost + BoV.. need information Previous Previous    Next Next  

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Chris Hilton
Tinkerer
Victoria
TT

Posts: 11
Reg: 12-2006

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Wednesday, January 17, 2007 - 10:15 am, by:  Chris Hilton (Tetsuo) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey all

Well i got my guages installed yesterday on my drivers side pillar and i must say they look awesome.

I have a few questions.

1. In the TT soarer when does the pressure from the plenum actually go into the engine and give it that boost (generated from turbos)? this may be a novice question but i was in my friends R33 GTST and when it completely spools up u can feel the boost kick it (7 pound stock). Does it work differently because the turbos run sequencially?
On my boost guage the only time the boost actually drops is when i take my foot off the accelerator (auto). I hit 140 km/h and not once did i see the boost guage drop back to 0 then spool up again.

2. With blow of valves ive been quoted $600 which includes BoV, adapter kit and installation. This is pretty expensive but does it sould right to you guys? the people at autobarn were telling me that they need the adapter kit.
Anyone else done anything differently? anyone in melbourne willing to help me install one (if i dont need the kit and the stock BOV wont affect it)

Thanks guys, any other information would be great

Chris
Benjamin Burgess
DieHard
NSW
Toyota Soarer GT-TL, Toyota Corolla Conquest

Posts: 962
Reg: 07-2005

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Wednesday, January 17, 2007 - 10:47 am, by:  Benjamin Burgess (Jampac) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

1. The pressure from the plenum is connected to the engine when the inlet valves open. What you should be saying is when is the pressure from the turbo hitting the plenum and that's when you have some throttle open. The boost pressure sits behind the throttle flap. You can see this if you cruise along in a manual in 4th or 5th say or in a manualized auto with a locked connverter in 3rd or 4th, and you stamp on the throttle with say 1800-2000rpm on the clock. You'll see a small amount of boost initally, then the turbo well spool up and give full boost up to what's been set with the wastegate or boost controller. Once you close the throttle again (it's not quiet fully closed there is a very small opening) the boost again sits behind the throttle flap and the plenum goes into vaccum, and you get f***** whoosshh sounds if you have an externally venting BOV.

2. You'll need an adapter kit as aftermarket BOV's have completely different connection compared to a stock BOV.
Is it worth 600 bucks? No.
Do you need it? No.
When do you need it? When you actually run a lot of boost, or you want to be fully hectic.
Could you spend your money on better mods? Yes.

>I hit 140 km/h and not once did i see the boost >guage drop back to 0 then spool up again.

In an auto, the throttle never closes when the auto changes gears unlike a manual (unless u flat shift) you have to get off the throttle to clutch in and change gears, so boost has to build again each time. Sucks big time if you have a big turbo, manual and no antilag. This is why autos rock for drag racing as say for example you're running 25psi of boost, the auto changes gears and you still have 25psi of boost, rocks hey.
Chris Hilton
Tinkerer
Victoria
TT

Posts: 12
Reg: 12-2006

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Wednesday, January 17, 2007 - 12:36 pm, by:  Chris Hilton (Tetsuo) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks benjamin great reply

I was also told that the stock blow off valve actually feeds the excess 'blow off' back into the manifold is this correct? That would mean that a aftermarket BoV would make the guage's arm flicker?
Benjamin Burgess
DieHard
NSW
Toyota Soarer GT-TL, Toyota Corolla Conquest

Posts: 966
Reg: 07-2005

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Wednesday, January 17, 2007 - 01:02 pm, by:  Benjamin Burgess (Jampac) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yes stock BOV is what is called plump back. Not all aftermarket BOV are vent to atmo, there is some rare ones that plump back, but most people in the market for a BOV are after hecticness rather than function, so majority wins.

As for the vent to atmo bov making the arm flicker, no. If your reading pressure on your boost gauge from after the throttle flap, then there well be no flicker, it'll just read vac straight away, something like 20-22 inches of mercury, when you snap shut the throttle and it goes f***** whooshh. From memory stock BOV feeds back in just after the turbos.
Vinh Bui
Goo Roo
NSW
94 UZZ31 (V8) / 96 JZZ30 (TT)

Posts: 1548
Reg: 07-2005

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Wednesday, January 17, 2007 - 01:55 pm, by:  Vinh Bui (Hyudsjk) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Chris Hilton wrote on Wednesday, January 17, 2007 - 10:15 am:

Does it work differently because the turbos run sequencially?




Our turbos are run in parallel :-)
The 2JZ-GTE has the sequential setup.
Chris Hilton
Tinkerer
Victoria
TT

Posts: 13
Reg: 12-2006

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Wednesday, January 17, 2007 - 02:15 pm, by:  Chris Hilton (Tetsuo) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks ben.

my current bost guage is installed to the top left hand corner of my engine, not entirely sure what 'line'that has to do with the turbo do you?

Vinh ok my bad, i was under the impression of sequential. Is there a reason as to why they changed the way turbos interact?

benjamin.
What would u suggest i get done rather than the BoV with that kind of money to increase both performance and sound of the car?
Do you have exhaust recomendations?

thanks
Chris
Benjamin Burgess
DieHard
NSW
Toyota Soarer GT-TL, Toyota Corolla Conquest

Posts: 969
Reg: 07-2005

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Wednesday, January 17, 2007 - 02:23 pm, by:  Benjamin Burgess (Jampac) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Noise and performance at the same time, then get a cat back exhaust done. Two birds one stone. 600 might be a little under budget for a new one, but is more than enough for second hand cat back exhaust.

Exhaust comes down to personal preference. I like them quiet and well under 90db for epa noise test so cops don't give me You sound like you want loud. You'll have no problem finding a place that'll do that cause funnierly enough it's actually the cheapest solution.

Say hi to paris
Aka Abedin
DieHard
NSW
TT

Posts: 652
Reg: 07-2005

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Wednesday, January 17, 2007 - 02:39 pm, by:  Aka Abedin (Soarer_91tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Exhaust would be one be my 1st mod to do unless you are after the wanke factor of psshhhuuuuuuuuuu.

I got my BOV done for the wanke factor ages ago, and now kinda over it. I will soon be putting my stock 1 back on.

For $600 you will not get a full exhaust done but save a bit more and get the whole lot done and enjoy an additional 2psi and fry those rear tyres.
Chris Hilton
Tinkerer
Victoria
TT

Posts: 14
Reg: 12-2006

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Wednesday, January 17, 2007 - 02:47 pm, by:  Chris Hilton (Tetsuo) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I got a quote from Mr muffler for $780 for a cat back 3" twin exhaust with 4"cannons and they will throw in a resonator to slightly quietn it down.

Also quote from Jspec racing for 600x300 intercooler with piping and air intake - piping to pod filter and located right hand corner closer to the ground (near stock intercooler) for $1100

From what ive read a new dump pipe is a neccessity, anyone know anyone who actually make and install them? Yes i know of Lew, but im looking for local so please I KNOW but dont mention it.

AKA abedin ahaha, how much did yours cost in total? did u need the adapter ect? got picture?
Aka Abedin
DieHard
NSW
TT

Posts: 653
Reg: 07-2005

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Wednesday, January 17, 2007 - 03:05 pm, by:  Aka Abedin (Soarer_91tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Chris you are looking at around $1000 for full 3inch front pipe back = 3inch hi-flow cat = 2.5inch twin with xforce hotdogs.

I got that and my BOV adaptor done at once from my exhaust guy. Got him to custom make it into the factory position.

I will take pics later on for you when I get a chance.
Alan Chow
TryHard
Vic
GTT-L

Posts: 189
Reg: 12-2006

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Wednesday, January 17, 2007 - 04:39 pm, by:  Alan Chow (Alanchow) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Aka, thats not dual exhausts is it? Seems a bit too cheap to me.
Shaun Stephenson
TryHard
Vic
Jzz30 TT & ST162

Posts: 268
Reg: 04-2006

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Wednesday, January 17, 2007 - 05:36 pm, by:  Shaun Stephenson (Neonasty) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Petes pipes in Dandenong. I dont know exactly where, but he makes dumps for the 1jzgte. I have a set, but havnt fitted them.

Save up the extra cash and get a full 3" exhaust from dumps back, or even from the stock dumps back. You will get mucb better performance and can get the sounds you desire.
Alan Chow
TryHard
Vic
GTT-L

Posts: 192
Reg: 12-2006

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Wednesday, January 17, 2007 - 05:39 pm, by:  Alan Chow (Alanchow) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

yeah joe's selling me a pipe from stock turbo Y piece all the way back to the diff. I just need a high flow cat, Y and canons.
Nickel Quimada
Tinkerer
Western Australia
GT-T

Posts: 51
Reg: 04-2006

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Wednesday, January 17, 2007 - 07:01 pm, by:  Nickel Quimada (Pinoy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

hey chris

I got my HKS ssqv kit from greenline. Comes with everything including adapter. Cost me $340 from memory and another $80 to install. Free if you can do it yourself :-)


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Nickel Quimada
Tinkerer
Western Australia
GT-T

Posts: 53
Reg: 04-2006

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Wednesday, January 17, 2007 - 07:50 pm, by:  Nickel Quimada (Pinoy) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

yeah stock one comes off. The kit comes with a plate that blocks the hole.


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Alan Chow
TryHard
Vic
GTT-L

Posts: 200
Reg: 12-2006

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Wednesday, January 17, 2007 - 08:00 pm, by:  Alan Chow (Alanchow) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Depending on where you mount the bov you might not need to remove the stock bov. Mine is placed near the intake manifold so the backpressure doesn't have a chance to get back to the stockie.
Aka Abedin
DieHard
NSW
TT

Posts: 658
Reg: 07-2005

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Thursday, January 18, 2007 - 09:24 am, by:  Aka Abedin (Soarer_91tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Alan Chow wrote on Wednesday, January 17, 2007 - 04:39 pm:

Aka, thats not dual exhausts is it? Seems a bit too cheap to me.




yeah mate it duel exhaust.

I will take some pics for you this weekend. As for the price I have been going to him for the last 5yrs now. So he gives me a good deal.

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