classic oe sti backbox
22 February 2012, 04:25 PM
#1
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classic oe sti backbox
hi,im thinking of fitting the oe sti backbox on my v4 sti type r to quieten it down.currently running a h&s sports cat downpipe with h&s straight through centre and ninja backbox.
its making 338/316....
will it be too restrictive?will the mapping need altering? or is it a case of fitting it back on and all will be well but with less noise?
thanks
its making 338/316....
will it be too restrictive?will the mapping need altering? or is it a case of fitting it back on and all will be well but with less noise?
thanks
22 February 2012, 04:45 PM
#2
It will flow less air than the H&S backbox, the standard one does a full 'S' in the backbox where as the H&S is virtually straight through with a baffle, it would require a slight remap to be 100%
Although I doubt that fitting it would do much harm being slightly restrictive would probably lend itself to slightly rich running, someone can correct me if im wrong, it will defiantly quieten things down, I used to a run A straight through system de-cat with just a H&S backbox on my old v4 sti wagon, that was loud.. the standard one is MUCH quieter, still have the standard in the shed I think.
Although I doubt that fitting it would do much harm being slightly restrictive would probably lend itself to slightly rich running, someone can correct me if im wrong, it will defiantly quieten things down, I used to a run A straight through system de-cat with just a H&S backbox on my old v4 sti wagon, that was loud.. the standard one is MUCH quieter, still have the standard in the shed I think.
Last edited by Ginola; 22 February 2012 at 04:57 PM.
22 February 2012, 05:05 PM
#3
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It will flow less air than the H&S backbox, the standard one does a full 'S' in the backbox where as the H&S is virtually straight through with a baffle, it would require a slight remap to be 100%
Although I doubt that fitting it would do much harm being slightly restrictive would probably lend itself to slightly rich running, someone can correct me if im wrong, it will defiantly quieten things down, I used to a run A straight through system de-cat with just a H&S backbox on my old v4 sti wagon, that was loud.. the standard one is MUCH quieter, still have the standard in the shed I think.
Although I doubt that fitting it would do much harm being slightly restrictive would probably lend itself to slightly rich running, someone can correct me if im wrong, it will defiantly quieten things down, I used to a run A straight through system de-cat with just a H&S backbox on my old v4 sti wagon, that was loud.. the standard one is MUCH quieter, still have the standard in the shed I think.
22 February 2012, 06:53 PM
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ive already got an oe backbox,just wondering wether it will be ok fitting it back on the car after mods and remap etc as its already mapped for 338/316.
Last edited by 99greenwagon; 22 February 2012 at 08:20 PM.
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23 February 2012, 03:14 PM
#9
No it's not ok 
best scenario ...do it and your turbo will get '******* hot' you will feel it aswell and drive nasty Worst scenario you get muchous det spikes and you do some damage. I am running 1.4 on my wagon and it hated having the standard box on, it has awful flow and a very pinched exit pipe !
best scenario ...do it and your turbo will get '******* hot' you will feel it aswell and drive nasty Worst scenario you get muchous det spikes and you do some damage. I am running 1.4 on my wagon and it hated having the standard box on, it has awful flow and a very pinched exit pipe !
23 February 2012, 07:18 PM
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No it's not ok best scenario ...do it and your turbo will get '******* hot' you will feel it aswell and drive nasty Worst scenario you get muchous det spikes and you do some damage. I am running 1.4 on my wagon and it hated having the standard box on, it has awful flow and a very pinched exit pipe !
best scenario ...do it and your turbo will get '******* hot' you will feel it aswell and drive nasty Worst scenario you get muchous det spikes and you do some damage. I am running 1.4 on my wagon and it hated having the standard box on, it has awful flow and a very pinched exit pipe ! 
24 February 2012, 08:57 PM
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No it's not ok best scenario ...do it and your turbo will get '******* hot' you will feel it aswell and drive nasty Worst scenario you get muchous det spikes and you do some damage. I am running 1.4 on my wagon and it hated having the standard box on, it has awful flow and a very pinched exit pipe !
best scenario ...do it and your turbo will get '******* hot' you will feel it aswell and drive nasty Worst scenario you get muchous det spikes and you do some damage. I am running 1.4 on my wagon and it hated having the standard box on, it has awful flow and a very pinched exit pipe !
24 February 2012, 09:25 PM
#15
Sounds like you want me to tell you what you want to hear mate is all. No it will not be ok if you are running anywhere near enough boost to allow you to hit 338/316. At the risk of repeating my self (as I wasn't telling porkies, guessing or speaking about something I haven't tried)...best scenario ...do it and your turbo will get '******* hot'... worst scenario you get muchous det spikes and you will do some damage.
If you have or have access to an original STi BB, measure the OD of the pipe that exits the box, it's very very small ! on the NewAge STi BB its considerably bigger which is why I run 335/375 on one in my Spec D.
OEM STi BB is not suitable for your car at that level of power/boost given it's been mapped for more flow. The back pressure will not be your friend
Or I could be lying and it's fine until you get to the magic 400+
It's a bit like asking enough people whether your gearbox will take 350 running your mods. Someone will say "yeah fine mate" at some point IMHO No.
If you have or have access to an original STi BB, measure the OD of the pipe that exits the box, it's very very small ! on the NewAge STi BB its considerably bigger which is why I run 335/375 on one in my Spec D.
OEM STi BB is not suitable for your car at that level of power/boost given it's been mapped for more flow. The back pressure will not be your friend
Or I could be lying and it's fine until you get to the magic 400+
It's a bit like asking enough people whether your gearbox will take 350 running your mods. Someone will say "yeah fine mate" at some point
IMHO No.
24 February 2012, 09:29 PM
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Sounds like you want me to tell you what you want to hear mate is all. No it will not be ok if you are running anywhere near enough boost to allow you to hit 338/316. At the risk of repeating my self (as I wasn't telling porkies, guessing or speaking about something I haven't tried)...best scenario ...do it and your turbo will get '******* hot'... worst scenario you get muchous det spikes and you will do some damage.
If you have or have access to an original STi BB, measure the OD of the pipe that exits the box, it's very very small ! on the NewAge STi BB its considerably bigger which is why I run 335/375 on one in my Spec D.
OEM STi BB is not suitable for your car at that level of power/boost given it's been mapped for more flow. The back pressure will not be your friend
Or I could be lying and it's fine until you get to the magic 400+
It's a bit like asking enough people whether your gearbox will take 350 running your mods. Someone will say "yeah fine mate" at some point IMHO No.
If you have or have access to an original STi BB, measure the OD of the pipe that exits the box, it's very very small ! on the NewAge STi BB its considerably bigger which is why I run 335/375 on one in my Spec D.
OEM STi BB is not suitable for your car at that level of power/boost given it's been mapped for more flow. The back pressure will not be your friend
Or I could be lying and it's fine until you get to the magic 400+
It's a bit like asking enough people whether your gearbox will take 350 running your mods. Someone will say "yeah fine mate" at some point
IMHO No. Another member who was 'careful' about running well into the 300s has just stripped 1st gear
Anywho, to the OP, it's your car so do as you wish but ignore the above advice at your peril..
24 February 2012, 09:30 PM
#17
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Sounds like you want me to tell you what you want to hear mate is all. No it will not be ok if you are running anywhere near enough boost to allow you to hit 338/316. At the risk of repeating my self (as I wasn't telling porkies, guessing or speaking about something I haven't tried)...best scenario ...do it and your turbo will get '******* hot'... worst scenario you get muchous det spikes and you will do some damage.
If you have or have access to an original STi BB, measure the OD of the pipe that exits the box, it's very very small ! on the NewAge STi BB its considerably bigger which is why I run 335/375 on one in my Spec D.
OEM STi BB is not suitable for your car at that level of power/boost given it's been mapped for more flow. The back pressure will not be your friend
Or I could be lying and it's fine until you get to the magic 400+
It's a bit like asking enough people whether your gearbox will take 350 running your mods. Someone will say "yeah fine mate" at some point IMHO No.
If you have or have access to an original STi BB, measure the OD of the pipe that exits the box, it's very very small ! on the NewAge STi BB its considerably bigger which is why I run 335/375 on one in my Spec D.
OEM STi BB is not suitable for your car at that level of power/boost given it's been mapped for more flow. The back pressure will not be your friend
Or I could be lying and it's fine until you get to the magic 400+
It's a bit like asking enough people whether your gearbox will take 350 running your mods. Someone will say "yeah fine mate" at some point
IMHO No. so, at what level will my gearbox break?
24 February 2012, 10:49 PM
#22
99gw, I have a Prodrive bb sitting here doing nowt (I also have a 2.5" straight through s.s. centre as well).
The only thing wrong with the bb is the mating flange is shagged - its seating face rusted up a bit and therefore wouldn't seat very well with the centre section's flange. So you'd need to angle grind the flange off and weld on a fresh one - no biggie.
There are no drillled holes for sparkplugs neither
The only thing wrong with the bb is the mating flange is shagged - its seating face rusted up a bit and therefore wouldn't seat very well with the centre section's flange. So you'd need to angle grind the flange off and weld on a fresh one - no biggie.
There are no drillled holes for sparkplugs neither
Last edited by joz8968; 24 February 2012 at 10:52 PM.
24 February 2012, 10:55 PM
#23
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99gw, I have a Prodrive bb sitting here doing nowt (I also have a 2.5" straight through s.s. centre as well).
The only thing wrong with the bb is the mating flange is shagged - its seating face rusted up a bit and therefore wouldn't seat very well with the centre section's flange. So you'd need to angle grind the flange off and weld on a fresh one - no biggie.
There are no drillled holes for sparkplugs neither
The only thing wrong with the bb is the mating flange is shagged - its seating face rusted up a bit and therefore wouldn't seat very well with the centre section's flange. So you'd need to angle grind the flange off and weld on a fresh one - no biggie.
There are no drillled holes for sparkplugs neither
would it not mate up ok with a fresh gasket and plenty of sealant?or is it proper fooked?is it for a classic or newage?
24 February 2012, 11:00 PM
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99gw, I have a Prodrive bb sitting here doing nowt (I also have a 2.5" straight through s.s. centre as well).
The only thing wrong with the bb is the mating flange is shagged - its seating face rusted up a bit and therefore wouldn't seat very well with the centre section's flange. So you'd need to angle grind the flange off and weld on a fresh one - no biggie.
There are no drillled holes for sparkplugs neither
The only thing wrong with the bb is the mating flange is shagged - its seating face rusted up a bit and therefore wouldn't seat very well with the centre section's flange. So you'd need to angle grind the flange off and weld on a fresh one - no biggie.
There are no drillled holes for sparkplugs neither
24 February 2012, 11:02 PM
#25
For a Classic - it was on my STi 5 with that centre section before I got it remapped.
API advised me about the flange issue prior to fitting, but I went ahead and had it fitted anyway. There were no noticable gas leaks for the time that it was on. But don't know whether it would have eventually blowed, as didn't have it on for long (because I got a true 3" turbo-back system for my remap later on).
API advised me about the flange issue prior to fitting, but I went ahead and had it fitted anyway. There were no noticable gas leaks for the time that it was on. But don't know whether it would have eventually blowed, as didn't have it on for long (because I got a true 3" turbo-back system for my remap later on).
