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Old 09-05-2017, 08:58 AM   #1
whiterabbitrexy
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Default NO tune afr 10.2 on 20psi

So tonight i put on my old Gfb mbc and took it out for a spin and it boosted like crazy 20psi.
Was looking over the turbo vacuum hose and it didnt blow off Nor was there any kinks or holes...

I later read the gfb manufacturer pdf installation manual and it said do not use the mbc on a vacuum hose that has a restrictor pill...it says to remove the restrictor pill ?

Ive read soo many places on subaru forums even when you use a mbc u must leave in the restrictor pill ?

Ok so my main question is Lol if my Aem wideband 02 sensor reads 10.2 - 10.8 on WOT is it safe to keep it like that on 20 psi ??

I know it dosnt have a tune becuase the 1998 wrx gf8 ecu is not tunable.... what the previous owner must of done was a bumped up the gray380 cc injectors flow and a fuel pump upgrade... makes sense why car drinks a fair bit on driving it around town with no boost.
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Old 09-06-2017, 07:48 AM   #2
whiterabbitrexy
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Update

So i followed the instructions for my Gfb mbc and i removed the restrictor pill i had in the vacuum hose on the turbo and it boosted perfect like the good old days 3 years ago lol 14.5 psi....Its soo not true u still need the restrictor pill on a mbc setup

But I'm still wanting to know is it safe to turn up the boost 20 psi and trust my Aem wideband 02 sensor when its reading 10.2 to 10.8 ???
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Old 09-06-2017, 05:21 PM   #3
wrxlaunch
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you should get it tuned.... You don't know if its knocking or not.
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Old 09-07-2017, 08:27 AM   #4
whiterabbitrexy
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Originally Posted by wrxlaunch View Post
you should get it tuned.... You don't know if its knocking or not.
So your saying my factory knock sensor won't pick up any knock in the block ??
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Old 09-07-2017, 12:04 PM   #5
86Dreams
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what is this like an ej20k with a td04?
no its not safe. knowing boost and fuel doesnt give you a complete picture of whats happening in the cylinder.

The factory knock sensor will probably pick up the knock, but it also more than likely does not have a way to 'remember' it, it will probably only ever be able to react to it when it happens. What this means is that every time you boost that high, its going to knock and then pull timing, it wont be able to safely anticipate the knocking condition.
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Old 09-07-2017, 08:32 PM   #6
whiterabbitrexy
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Originally Posted by 86Dreams View Post
what is this like an ej20k with a td04?
no its not safe. knowing boost and fuel doesnt give you a complete picture of whats happening in the cylinder.

The factory knock sensor will probably pick up the knock, but it also more than likely does not have a way to 'remember' it, it will probably only ever be able to react to it when it happens. What this means is that every time you boost that high, its going to knock and then pull timing, it wont be able to safely anticipate the knocking condition.
It's a late ej20g. With ej207 bottom end internal's wrx heads vf22 22btmic.....3 inch tbe, headers , Cai....

Sorry but It doesn't sound like u know 100% how my knock sensor is working. ... I don't like to hear probably and more then likely. ..sounds like your making an a assumption...

I know for a fact that my knock sensor will see knock and will go beyond pulling timing it will just kill the fuel relay and give me fuel cut

Why do people run ritch to play it safe then ?
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Old 09-08-2017, 11:38 PM   #7
86Dreams
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Quote:
Originally Posted by whiterabbitrexy View Post
It's a late ej20g. With ej207 bottom end internal's wrx heads vf22 22btmic.....3 inch tbe, headers , Cai....

Sorry but It doesn't sound like u know 100% how my knock sensor is working. ... I don't like to hear probably and more then likely. ..sounds like your making an a assumption...

I know for a fact that my knock sensor will see knock and will go beyond pulling timing it will just kill the fuel relay and give me fuel cut

Why do people run ritch to play it safe then ?
Nope I don't don't know 100%. Consider everything else I said tho.

More fuel absorbs heat and increases knock resistance. No matter how much fuel you run tho, too much timing is too much timing.

Do you have a way to reprogram your ecu or look at it's calibrated settings?

Last edited by 86Dreams; 09-08-2017 at 11:47 PM.
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Old 09-09-2017, 07:51 AM   #8
whiterabbitrexy
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Originally Posted by 86Dreams View Post
Nope I don't don't know 100%. Consider everything else I said tho.

More fuel absorbs heat and increases knock resistance. No matter how much fuel you run tho, too much timing is too much timing.

Do you have a way to reprogram your ecu or look at it's calibrated settings?
Na man no way of reprograming ecu or tuning ecu.... all gc8 classic's from 94 to 98 can't be tuned.... next best thing is to send it off to ESL endurance solution's and they will put a chipset on it so it then can be tuned...

Sorry bro I should have stated at the start of the thread that I was thinking it might be safe because it's running factory ignition timing and it has not been advanced. ..

Think I might just play it safe and just run 15 psi on it.... been reading heaps of other subaru forums and it's been done plenty of times pushing 18 to 20 psi with no tune..... only thing u need to do its by pass the fuel cut the ecu sends when it sees 16 psi plus on the bcs
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Old 09-12-2017, 08:28 AM   #9
binny
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Not with a VF22 though a TD04 at 20 is fine if you have a VF23 or 34 keep the boost at 17 at the most
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