| Author |
Message |
Marius Hainal
TryHard
Victoria
TT manual
Posts: 138
Reg: 08-2005
|
How many of you have this issue ; i.e after installing the dump pipes ( from Lew ), boost cut hitting as there is no back pressure in the system and boost is rising above the limit?
I ordered the pipes but I just read posts regarding this... I just don't want trouble. If that happens, it means I would need to put in a boost controller of some sort to limit the boost to 12 psi or whatever.
I just need reliable transport 
Thanks allot |
Lew Radbourn
Trader
Queensland
jzs147 92 / 95 jzz31 98' / jzz30 ute92' / uzz30 93'/ 2 X uzz31 92' s
Posts: 1715
Reg: 07-2005
|
Marius;
Mate just get a fuel cut defender.
with the dumps it has been known to raise the boost level by 2 psi
that will put you right on the limit of the fuel cut in the car 14psi.
if it does spike you will go over that limit and the fuel will cut off until you get back down under the limit.
generally the soarer is set to around 11psi boost .some are 10 some are 12
cheers
Lew |
Graham Dollisson
Goo Roo
QLD
GTTL , Morris Marina, P76 V8 Super
Posts: 1093
Reg: 07-2005
|
Marius Hainal wrote on Friday, January 12, 2007 - 07:59 am:after installing the dump pipes ( from Lew ), boost cut hitting as there is no back pressure in the system and boost is rising above the limit?
It just goes to show you how good they are!! If you only wanted 12 psi, you didn't need them. You will need some sort of boost control. |
Marius Hainal
TryHard
Victoria
TT manual
Posts: 139
Reg: 08-2005
|
Lew Radbourn wrote on Friday, January 12, 2007 - 08:12 am:Marius;
Mate just get a fuel cut defender.
with the dumps it has been known to raise the boost level by 2 psi
that will put you right on the limit of the fuel cut in the car 14psi.
if it does spike you will go over that limit and the fuel will cut off until you get back down under the limit.
generally the soarer is set to around 11psi boost .some are 10 some are 12
cheers
Lew
Thanks Lew; which one would you recommend in that case ?
I mean best price/performance ratio, considering I won't be boosting the stockies higher?
Cheers |
Marius Hainal
TryHard
Victoria
TT manual
Posts: 140
Reg: 08-2005
|
I am asking as I KNOW I will get over the limit; mine's at 12 and 1/2 already with stock dumps |
Graham Dollisson
Goo Roo
QLD
GTTL , Morris Marina, P76 V8 Super
Posts: 1096
Reg: 07-2005
|
Ahh...I see! |
Chris Davey
Goo Roo
QLD
Corona
Posts: 1177
Reg: 07-2005
|
just get a FCD like Lew said or for a bit more a SAFC will effectively raise your boost cut level as well as making more power and better economy when booting it.
BTW you can't lower your boost to 12psi if it is naturally hitting 15psi. |
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder
Posts: 1160
Reg: 03-2006
|
Like Chris has mentioned, You cannot LOWER the boost. Base boost is 14.5pis, then thats as low as you will get it. An Electronic boost controller will only raise it, not lower it. |
Shaun Stephenson
TryHard
Vic
Jzz30 TT & ST162
Posts: 263
Reg: 04-2006
|
Loosen some of the clamps on the boost side of the turbos?
That'll bleed off some boost hehe
on Toymods one guy didnt want his car boosting to 15 pound, so he covered his air filter in cardboard and cut holes in it. Worst idea ever! However I think it did work (in reducing boost and efficiency) |
Rob Andreacchio
Moderator
Victoria
Supercharged VT Calais & 1991 JZZ30
Posts: 2221
Reg: 01-2005
|
Chris Davey wrote on Friday, January 12, 2007 - 09:40 am:or for a bit more a SAFC will effectively raise your boost cut level as well
Eeerrr... no it won't...
SAFC will trim fuel, but does not remove the factory boost cut. You would still need a FCD installed with the SAFC. |
Graham Dollisson
Goo Roo
QLD
GTTL , Morris Marina, P76 V8 Super
Posts: 1097
Reg: 07-2005
|
Marius, how much boost do you want to run?? |
Dean Carsen
Tinkerer
SA
JZZ30 vvti 5 speed
Posts: 82
Reg: 07-2005
|
When I had a SAFC and 440's on a TT it did actually raise the boost cut to somewhere over 17 psi. I dont think its designed to do that but the stock boost cut returned when it was removed. |
Rob Andreacchio
Moderator
Victoria
Supercharged VT Calais & 1991 JZZ30
Posts: 2222
Reg: 01-2005
|
Yours is the 1st that I have heard of, and even Apexi themselves will confirm the SAFC will not increase boost cut.
 |
Dean Carsen
Tinkerer
SA
JZZ30 vvti 5 speed
Posts: 83
Reg: 07-2005
|
Yeah I read that, I dont know how it did it, maybe it was wired in wrong but I never found where the cut off was when it was installed.. I put it down to that being an intercetor it was giving the wrong info to the cpu. |
Marius Hainal
TryHard
Victoria
TT manual
Posts: 141
Reg: 08-2005
|
Graham Dollisson wrote on Friday, January 12, 2007 - 10:06 am:Marius, how much boost do you want to run??
I only want to run as much as the stock turbines can cope with, hoping they will last a while longer. I will live with whatever I get from high-flowing the exhaust .
Just that this is my main car and has to be also reliable, that's it. I just wanted to change the cat if you look at other posts then got convinced by people here to get dumps and do it from scratch , and here I am |
Chris Davey
Goo Roo
QLD
Corona
Posts: 1178
Reg: 07-2005
|
If boost cut is seen at 4.82V or whatever it is from the Map sensor, when the SAFC is used to take some fuel out it is effectively lowering the voltage of the signal that is sent to the ecu. So if you pull some fuel and you are still running a natural 15psi, the ecu may only see 4.6v or 13psi odd. Therefore, you have effectively increased boost cut slightly.
I haven't done it as I have never had a SAFC but that is how I figured it should work. Anybody with SAFC confirm?
Otherwise, a 2jz map sensor and 440cc injectors could also do the trick |
Graham Dollisson
Goo Roo
QLD
GTTL , Morris Marina, P76 V8 Super
Posts: 1098
Reg: 07-2005
|
Marius Hainal wrote on Friday, January 12, 2007 - 10:34 am:I only want to run as much as the stock turbines can cope with, hoping they will last a while longer. I will live with whatever I get from high-flowing the exhaust .
Unfortunately, you never quite know what the stockies will take. Some people have run 16psi for years with no trouble. then the next guy will blow them with no mods at all, a week after he buys the car. It's a bit like lotto.
Like Lew said, put on the dumps and fit an FCD and see how she goes.
Have you got the rest of the exhaust done yet? |
Marius Hainal
TryHard
Victoria
TT manual
Posts: 142
Reg: 08-2005
|
I am going for an inspection in half an hour at the exhaust shop, and we'll see how and what to do.
I plan on a 3 inch pipe down to a Magnaflow 3 inch cat, and then 2.5" down to the mufflers. If mufflers are in bad shape, I will change them too, if not will live with them maybe, see how she goes.
I know they are a bit restrictive, but they are quiet, I am hoping to get a bit of boost and less lag without increasing noise |
Marius Hainal
TryHard
Victoria
TT manual
Posts: 143
Reg: 08-2005
|
I don't have any resonators from memory, so whoever did work on compliance or after removed them, but it's not noisy at all as is now. |
Graham Dollisson
Goo Roo
QLD
GTTL , Morris Marina, P76 V8 Super
Posts: 1100
Reg: 07-2005
|
Let us know how you go!!  |
Marius Hainal
TryHard
Victoria
TT manual
Posts: 144
Reg: 08-2005
|
Will sure do, thanks for your help |
Rob Andreacchio
Moderator
Victoria
Supercharged VT Calais & 1991 JZZ30
Posts: 2223
Reg: 01-2005
|
Chris Davey wrote on Friday, January 12, 2007 - 10:41 am:Anybody with SAFC confirm?
Yep... I needed a FCD with my install. |
Maurice Diggler
DieHard
Victoria
Twin Turbo
Posts: 807
Reg: 06-2006
|
Rob Andreacchio wrote on Friday, January 12, 2007 - 10:00 am:SAFC will trim fuel, but does not remove the factory boost cut. You would still need a FCD installed with the SAFC.
I'm pretty sure it will Reepa, removing boost cut is just a matter of the tuner of the SAFC to clamp the Map voltage so it never reads above the boost cut voltage.
Same as a simple FCD, it just alters the map sensor voltage so that it always senses lower than it's actually running.
Neat little trick eh! |
Rob Andreacchio
Moderator
Victoria
Supercharged VT Calais & 1991 JZZ30
Posts: 2224
Reg: 01-2005
|
Nope... Emanage allows for voltage clamp. SAFC does not. |
Chris Davey
Goo Roo
QLD
Corona
Posts: 1179
Reg: 07-2005
|
It's not clamping but it is lowering what the ECU sees so I can't see how it couldn't increase boost cut slightly. You do pull fuel out with the SAFC right? If you don't or you added then obviously it wouldn't increase boost cut, it "should" reduce it if you added fuel. |
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