Steve Posted September 12, 2004 Share Posted September 12, 2004 I am shortly getting a new exhaust system made with a decat pipe. Other than fitting a new Walbro fuel pump. Is there anything else that antone would advise doing? Would i need a restrictor ring or would the boost controller do the same job? Sorry if its a dumb question!! Quote Link to comment Share on other sites More sharing options...
ardasaliah Posted September 12, 2004 Share Posted September 12, 2004 You should have a boost gauge. You may need a restrictor. Uk or Jap?? Jap tend to over boost once the cats are out. Not sure if the boost controller would contol the level of boost as the wasgate on the jSPEC are too small so a restrictor ring may be needed Or am I chattin rubbish Quote Link to comment Share on other sites More sharing options...
Steve Posted September 12, 2004 Author Share Posted September 12, 2004 The car is a Jap Spec. Am still new to these cars any advice would help. Quote Link to comment Share on other sites More sharing options...
Clarkey Posted September 12, 2004 Share Posted September 12, 2004 You'll need to replace your plugs to a colder set to cope with the increased level of boost. Denso IK22's are the recommened ones. People have experienced detontation & misfire because of not upgrading the plugs. Talk to the Vortex boys The Walbro as you've said. Without the cats - you could boost spike to 1.4Bar - not good. You'll need a restrictor ring to bring the boost down to a safe 1.2Bar. See Chris Wilson or Paul E. You'll also need a Fuel Cut Controller. Fuel cut occurs when the stock ECU detects boosts levels >= 1 Bar. TRL sell the - VFCC. Rather than removing this restriction - it increases it. So that Fuel Cut occurs at > 1.2Bar ... as I understand it the Fuel Cut limit is configurable. For you're MOT - 2 decats might work better than a single decat pipe. With the 2 decat pipes you can just swap decat pipe #2 for cat #2 in about 20 minutes. I'm guessing but a single decat pipe - would this be more of a pain in the arse ? I don't know, maybe someone else who's more brainy than me can answer this better. Edit: As far as I understand a Boost controller can only raise the boost - not lower it. I guess you'd only need a boost controller - if you never reach 1.2Bar with Restrictor Ring in - set @ 1.2Bar in cold weather. So you'd use the Boost Controller to raise the Boost to 1.2Bar. Quote Link to comment Share on other sites More sharing options...
merckx Posted September 12, 2004 Share Posted September 12, 2004 Smarty I've got a J spec TT, it's fitted with a Nur Spec R exhaust and recently I did the full decat. When I push the car hard on full boost I was getting a misfire so I was looking into getting some new plugs. Thought about getting the Denso IK 22's at approx £65 - £70. But after doing a search on here and the mkiv.com site I find they recommend NGK BKR7E (6097) , bought a full set of these at my Partco shop £10.47 including VAT. The car is now running perfectly! The Denso plugs may last longer but I'll change the NGK ones every 6k miles and still save a load of money! Quote Link to comment Share on other sites More sharing options...
Clarkey Posted September 12, 2004 Share Posted September 12, 2004 Originally posted by merckx NGK BKR7E (6097, bought a full set of these at my Partco shop £10.47 including VAT. I thought the NGK BKR7E's don't come pre-gapped for high boost ? All the feedback I got from Q&A here - has been either a) Denso IK22's or 24's b) NGK PFR7B 4853 laser platinum plugs - good for 1.4Bar What Spark Plugs ? Quote Link to comment Share on other sites More sharing options...
merckx Posted September 12, 2004 Share Posted September 12, 2004 Sorry, forgot to mention NGK BKR7E's need to be gapped to 0.80mm (32 thou). They came pre- gapped very close to this anyway. On the mkiv.com site they recommend these plugs for the BPU upgrade and after doing a long search I found others on this site that also use them. Got this from mkiv.com Here is a list of the most commonly used spark plugs, Stock Denso PK20R11, Comes pre-gaped at 0.043 inch (best on stock supra) Stock NGK BKR6EP-11 (2978), Comes pre-gaped at 0.043 inch (best on stock supra) NGK BKR7E (6097), Comes pre-gaped at 0.032 inch (best on BPU & APU supra) NGK BCPR7ES (3330), Comes pre-gaped at 0.032 inch (best on BPU & APU supra) Quote Link to comment Share on other sites More sharing options...
nigelboyne Posted May 11, 2009 Share Posted May 11, 2009 ik22 is perfect for bpu change them every 10k max Quote Link to comment Share on other sites More sharing options...
Homer Posted May 11, 2009 Share Posted May 11, 2009 ik22 is perfect for bpu change them every 10k max This thread is 5 years old mate! Please check the last reply date before responding Quote Link to comment Share on other sites More sharing options...
Steve Posted May 11, 2009 Author Share Posted May 11, 2009 This thread is 5 years old mate! Please check the last reply date before responding Was just thinking when did i ask about a decat Quote Link to comment Share on other sites More sharing options...
bignum Posted May 11, 2009 Share Posted May 11, 2009 Hell, your car has changed abit since then:d Quote Link to comment Share on other sites More sharing options...
Homer Posted May 11, 2009 Share Posted May 11, 2009 Was just thinking when did i ask about a decat I did at first wonder why you were asking about decats Quote Link to comment Share on other sites More sharing options...
tbourner Posted May 12, 2009 Share Posted May 12, 2009 And why am I subscribed to this thread? Quote Link to comment Share on other sites More sharing options...
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