Terminator Posted May 15, 2006 Share Posted May 15, 2006 I might be wrong here but wasn't the term BPU first coined by Suprastore.com? I believe so, and I thought they tried to claim copyright and stop other traders using it. It is agood idea to fit and EGT gauge so you can keep an eye on temperatures at high boost when things can go lean and into melt down. Quote Link to comment Share on other sites More sharing options...
Jake Posted May 15, 2006 Share Posted May 15, 2006 cool mate cheers, at least knowing that i dont need a boost controller will save a couple of hundred since i have a kakimoto cat back all i need then is 1st decat, PLUGS, fuel pump, and FCD, restrictor ringI use a boost controller anyway because I use a 1 bar restrictor. Are you saying your exhaust has replaced the second cat? Unusual. Quote Link to comment Share on other sites More sharing options...
Guest EncoreWRC Posted May 15, 2006 Share Posted May 15, 2006 I was told that if you decat the 2nd pipe then you increase boost pressures and can easily blow the j spec ceramic turbo's? thats why I was only thinking on the 1st de cat Quote Link to comment Share on other sites More sharing options...
supraman.chris Posted May 15, 2006 Share Posted May 15, 2006 I have a Blitz boost controler and a restrictor ring, i've been told it stops 'spiking' that the controler can't cope with. double negative? Quote Link to comment Share on other sites More sharing options...
moistfinger Posted May 15, 2006 Share Posted May 15, 2006 I have a TRD cat back exhaust and will be removing just the second cat at the moment.Will I need the restrictor ring/plate ? Or do you only need it when removing both cats? J Spec TT VVTI Quote Link to comment Share on other sites More sharing options...
Marco Posted May 15, 2006 Share Posted May 15, 2006 Isn't a boostgauge required for BPU as well? Quote Link to comment Share on other sites More sharing options...
Jake Posted May 15, 2006 Share Posted May 15, 2006 I have a Blitz boost controler and a restrictor ring, i've been told it stops 'spiking' that the controler can't cope with. double negative?It's the wastegate that can't cope with the increased boost that a decat provides. A restrictor restricts the flow (and therefore boost) to a certain level (What level depends on its apeture) and the boost controller then raises it from there upo to level you want. I'm sure this is all in the FAQ somewhere. Quote Link to comment Share on other sites More sharing options...
Homer Posted May 15, 2006 Share Posted May 15, 2006 I was told that if you decat the 2nd pipe then you increase boost pressures and can easily blow the j spec ceramic turbo's? thats why I was only thinking on the 1st de cat Correct, thats why with a full decat you need a restrictor ring to hold the boost at 1.2 bar. The 2nd decat will cause too much back pressure to acheive 1.2 bar (i.e bpu) unless you have a boost controller to raise boost past this (Not advised due to increase in EGT). single decat with boost controller is an arse about face way of going bpu on a Jap spec. (Also, restrictor ring £15 vs boost controller £200 or so) Quote Link to comment Share on other sites More sharing options...
Guest EncoreWRC Posted May 15, 2006 Share Posted May 15, 2006 and what boost can the standard J spec turbos handle safely? Quote Link to comment Share on other sites More sharing options...
Jake Posted May 15, 2006 Share Posted May 15, 2006 I was told that if you decat the 2nd pipe then you increase boost pressures and can easily blow the j spec ceramic turbo's? thats why I was only thinking on the 1st de catRemoving either cat will increase boost on a j-spec TT. Increasing boost increases wear and the chance of failure. Removing both cats increases boost a lot. More than the wastegate can cope with. You can then use a restrictor in the exhaust to bring the boost down to a safer lever. (Typically 1.1 to 1.2 bar is ok) Quote Link to comment Share on other sites More sharing options...
Guest EncoreWRC Posted May 15, 2006 Share Posted May 15, 2006 sorry - I m to slow on replying, just read your msg Homer. So I would jsut need to get a restrctor ring for £15 which would stop boost at 1.2 bar - sorted Quote Link to comment Share on other sites More sharing options...
Homer Posted May 15, 2006 Share Posted May 15, 2006 and what boost can the standard J spec turbos handle safely? Depends on your luck, 1.2 bar is generally accepted as the 'safe' limit. Some have gone a few thousand miles and lost a turbo, others (like me) have done over 30k and had no problems. Only thing I'd advise is to do it properly and ensure the car is ready for the increase of HP (All fluids replaced, all filters inc fuel, replaced, top condition IC, etc) Quote Link to comment Share on other sites More sharing options...
Ewen Posted May 15, 2006 Share Posted May 15, 2006 Since theres experts posting at the mo....whats a loose budget for BPU done properly, inc. boost gauge and egt gauge but not inc. cat back exhaust ? Quote Link to comment Share on other sites More sharing options...
Homer Posted May 15, 2006 Share Posted May 15, 2006 sorry - I m to slow on replying, just read your msg Homer. So I would jsut need to get a restrctor ring for £15 which would stop boost at 1.2 bar - sorted Too many of us replying at once here Correct though, if you do a full decat, you just need the restrictor ring to bring boost down to 1.2 bar (Or whatever else you specifiy). Chris Wilson highly recommended here! Quote Link to comment Share on other sites More sharing options...
DannoSupra Posted May 15, 2006 Share Posted May 15, 2006 Soz for Hijack, i'l be getting my 1stcat removed this weekend, Seeing we're on the subject What boost should i run. on UK. or Whats the Max Boost. i'll probs run at 0.6Bar - 1.0Bar on one setting and get a Race Setting Quote Link to comment Share on other sites More sharing options...
Darren Posted May 15, 2006 Share Posted May 15, 2006 I have a TRD cat back exhaust and will be removing just the second cat at the moment.Will I need the restrictor ring/plate ? Or do you only need it when removing both cats? J Spec TT VVTI If you have a VVTI you can remove both CATs they dont suffer from boost creep. To hit 1.2 bar you will need a boost controller. HTH Quote Link to comment Share on other sites More sharing options...
Homer Posted May 15, 2006 Share Posted May 15, 2006 Since theres experts posting at the mo....whats a loose budget for BPU done properly, inc. boost gauge and egt gauge but not inc. cat back exhaust ? 1) 2x Decat pipes = £280 from Chris Wilson (proper SS jobs) 2) Walbro pump = £80 3) FCD = £80 Thor highly recommended as it raises boost cut to 1.25 bar rather than remove it 4) Electronic Boost gauge = £150 - more for DEFI, if you have the cash 5) 6x plugs = £20 for hgk's, £65 for IK22's 6) Fuel filter = £30 7) ECU reset = Free Prices are off the top of my head though! Quote Link to comment Share on other sites More sharing options...
moistfinger Posted May 15, 2006 Share Posted May 15, 2006 Thanks Darren Quote Link to comment Share on other sites More sharing options...
Homer Posted May 15, 2006 Share Posted May 15, 2006 Soz for Hijack, i'l be getting my 1stcat removed this weekend, Seeing we're on the subject What boost should i run. on UK. or Whats the Max Boost. i'll probs run at 0.6Bar - 1.0Bar on one setting and get a Race Setting You mention UK, so VVTI is out of the question 1st decat removal should see you to 0.9 bar, doubledecat won't make much difference to that. The UK has a larger wastegate than the Jspec so will require a boost controller (and all the other mods - except the restrictor ring) to raise boost to 1.2 bar+ Quote Link to comment Share on other sites More sharing options...
DannoSupra Posted May 15, 2006 Share Posted May 15, 2006 You mention UK, so VVTI is out of the question 1st decat removal should see you to 0.9 bar, doubledecat won't make much difference to that. The UK has a larger wastegate than the Jspec so will require a boost controller (and all the other mods - except the restrictor ring) to raise boost to 1.2 bar+ I'm seeing a Bar now, with only 2nd cat removed, and Apex'i AVC-R fitted Quote Link to comment Share on other sites More sharing options...
Jake Posted May 15, 2006 Share Posted May 15, 2006 If you have a VVTI you can remove both CATs they dont suffer from boost creep. To hit 1.2 bar you will need a boost controller. Really? I've never heard that before. It's been that long since my VVTi was on the road I can't remember if I've tried it decatted and without a restrictor Quote Link to comment Share on other sites More sharing options...
Homer Posted May 15, 2006 Share Posted May 15, 2006 I'm seeing a Bar now, with only 2nd cat removed, and Apex'i AVC-R fitted Okay, you didn't mention the 2nd had gone already. Anyway, removing the 1st one won't make much difference without the controller, but as you have an AVC-R, it'll make no difference. You can set the AVC-R to see whatever you want, cat removal is irrelevant (Though of course its best to get those things out of there!) Quote Link to comment Share on other sites More sharing options...
Darren Posted May 15, 2006 Share Posted May 15, 2006 You mention UK, so VVTI is out of the question If that was aimed at me I was replying to moistfinger who mentioned VVTI in his own post? If not no worries........ Quote Link to comment Share on other sites More sharing options...
Homer Posted May 15, 2006 Share Posted May 15, 2006 If that was aimed at me I was replying to moistfinger who mentioned VVTI in his own post? If not no worries........ Oops, ignore my comment then! Quote Link to comment Share on other sites More sharing options...
Darren Posted May 15, 2006 Share Posted May 15, 2006 Really? I've never heard that before. It's been that long since my VVTi was on the road I can't remember if I've tried it decatted and without a restrictor Oh yes they are same as UK in this regard...only quicker Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.