AMG Posted February 27, 2005 Share Posted February 27, 2005 Finally found which pipe had popped off stopping the second turbo kicking in and took it out for a thrash. I now have no cats and a restrictor ring but managed to achieve 1.34 bar with no fuel cut kicking in at all. When i had just my first cat in i was hitting fuel cut at 1.25 bar. Is this expected? Bit worried that i am getting over 1.3bar at the minute. Link to comment Share on other sites More sharing options...
Toms Supra Posted February 27, 2005 Share Posted February 27, 2005 mines does as well, are your turbos standard though? i got hybrids, uprated pump and fcd so mines ok. Link to comment Share on other sites More sharing options...
Grazer Posted February 27, 2005 Share Posted February 27, 2005 Have you uprated plugs and fuel pump? Any mis-firing? When I fully decatted I hit 1.5bar with horrendous mis-firing, but plugs and Walbro sorted it out. Failing that you need a restrictor ring with a narrower apperture - speak to CW. Link to comment Share on other sites More sharing options...
AMG Posted February 27, 2005 Author Share Posted February 27, 2005 I have uprated my plugs (HKS) and at the minute have no FCD wired in (did have one but took it out for a bit and when tried to wire it in again it is giving me trouble, so not in at the mo). The turbos were rebuild (to standard spec i presume) about 2 years ago. No miss firing that i can tell and still with the standard pump (although i admit i have not checked to see if it has been upgraded before me). I am planning to upgrade my pump and get a FPR at some point but want to make sure it is going to be ok first with regards to boosting, can't afford another blow up. Link to comment Share on other sites More sharing options...
paul mac Posted February 27, 2005 Share Posted February 27, 2005 are you sure your gauge is accurate cos that seems very high with a restrictor ring in Link to comment Share on other sites More sharing options...
AMG Posted February 27, 2005 Author Share Posted February 27, 2005 yeah pretty sure it is right. Only been getting about 0.7 bar on first turbo only because a pipe blew off the EGCV last week. 0.7 lines up with what i should be getting when had the problem so presume the gauge is right. Link to comment Share on other sites More sharing options...
paul mac Posted February 27, 2005 Share Posted February 27, 2005 yeah pretty sure it is right. Only been getting about 0.7 bar on first turbo only because a pipe blew off the EGCV last week. 0.7 lines up with what i should be getting when had the problem so presume the gauge is right. thats a fair point mate, might be worth double checking with another gauge if you get the chance, or it could be a genuine reading, mine is a j-spec full decat and hits a maximum when its feckin cold of 1.24 bar Link to comment Share on other sites More sharing options...
AMG Posted February 27, 2005 Author Share Posted February 27, 2005 Its the fuel cut that is confusing me too. When had first cat in i was hitting it at 1.25 bar on the gauge, now without cats it aint cutting in at all?? Link to comment Share on other sites More sharing options...
Grazer Posted February 27, 2005 Share Posted February 27, 2005 When I fully decatted I hit 1.5bar Decatted J-spec can go way over 1.2! Link to comment Share on other sites More sharing options...
paul mac Posted February 27, 2005 Share Posted February 27, 2005 all sounds a bit odd mate, i've hit the limits of my technical envelope (in other words i dont know wot the f**k i'me talking about) wait patiently and someone will be along shortly that does Link to comment Share on other sites More sharing options...
Aerotop Dave Posted February 28, 2005 Share Posted February 28, 2005 ...and still with the standard pump (although i admit i have not checked to see if it has been upgraded before me) You've got a 93 car there, so that fuel pump could be 12 years old. If it's performance has dropped to 90 or 80% with wear you might wanna check if it's been replaced to prevent running too lean (don't ask me anything technical about this comment as it's just what I've picked up from other threads and I know sod all about cars) Link to comment Share on other sites More sharing options...
Steve W2 Posted February 28, 2005 Share Posted February 28, 2005 You definetly have a funny sounding problem. Although looking at fuel pump won't hurt (for information purposes) it's not really the problem as I understand it. If you car was hitting fuel cut previously, running lower boost, it should do exactly the same now. Something is wrong and I wouldn't drive it on high boost until you have sorted it out. 1.34 bar is way beyond the fuel cut limit and beyond the safe operating capablility of the standard turbos. You should: 1. Check your pressure gauge tubing for blockages. 2. Fit the FCD you have. 3. Get a new restrictor ring. 4. Not drive at 1.34 bar on a standard fuel pump. Link to comment Share on other sites More sharing options...
AMG Posted February 28, 2005 Author Share Posted February 28, 2005 cheers for all your help people, think i will crawl all over it at the weekend make sure everything is as it should be. Link to comment Share on other sites More sharing options...
Ian C Posted February 28, 2005 Share Posted February 28, 2005 Fuel cut doesn't kick in instantly at 1.0bar although that's the minimum threshold for it. If you are getting these boost figures off a peak hold, that's what it is - a peak. Your turbos could spike to 1.3+ bar due to the free exhaust and the cold weather, but then the boost could drop off again before fuel cut clobbers it all. With a cat in the boost wouldn't build so fast so you'd only get to say 1.2bar before fuel cut kicked in. It's kinda of time/load/delta related but no-one knows the exact profiles of overboosting that the ECU looks for. Are these spikes or are they maintained pressure levels? If you are maintaining 1.3bar without an FCD I'd find that rather odd, unless you have an airflow tuning box like an AFC installed...? -Ian Link to comment Share on other sites More sharing options...
AMG Posted February 28, 2005 Author Share Posted February 28, 2005 I don't have a AFC mate. The 1.34 bar is the peak that has been recorded by the gauge as i tend to keep my eyes on the road on full boost The spiking might explain it a bit better, i will try and keep my eyes on the gauge tomorrow morning on the way to work (traffic allowing). Thanks for your help Ian. Link to comment Share on other sites More sharing options...
AMG Posted March 1, 2005 Author Share Posted March 1, 2005 Todays update is: Just booted it onto the motorway, was watching the boost get higher and higher until it hit 1.4 bar, then i shit out and backed off. On the way home, i THINK i was doin about a 110 accelerating quite hard when the fuel cut kicked in!!!!!! I was'nt watching the gauge at the time but dont think i was at 1.4 bar so maybe it is spiking and dropping but i am shitting it when i see 1.4 and back off. Link to comment Share on other sites More sharing options...
SKI Posted March 22, 2005 Share Posted March 22, 2005 I've just fitted a set of technics hybrids, my car is UK spec in top condition, IK24, FCD, Bleed valve, full decat 3'' pipe, TRD air filter. When I boot her she hits and holds (quite easily) 1.45 bar which is quite worrying (even with the bleed valve completely closed). I dont really understand this. Another friend has exactly the same problem on his UK spec after fitting hybrids. I'm taking her to C.W tomorrow to have his SMIC fitted and a closer look at the boosting, may need to have a restrictor ring fitted. I know this is standard practice on the Jspec after BPU, but is this normal on a UK? Cheers Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 22, 2005 Share Posted March 22, 2005 It's normal when the wastegate pipe off the turbo scroll is lathed through by the fan pulley and not even connected at the turbo end.... That was a cheap repair for you wasn't it?!! Link to comment Share on other sites More sharing options...
SKI Posted March 22, 2005 Share Posted March 22, 2005 Cheers Chris for the great job (once again), I had a REALLY enjoyable drive home. Link to comment Share on other sites More sharing options...
Alex Posted March 22, 2005 Share Posted March 22, 2005 AMG - Check your ECU - passenger footwell - look for a badge on the ECU saying "MINES" if it has one that would explain a lot! Link to comment Share on other sites More sharing options...
AMG Posted March 22, 2005 Author Share Posted March 22, 2005 Already checked that mate, it is a stock ECU. I am tempted to change to a mines if can get one but going to try sorting my fuel cut out first. I wouldn't need it if had mines though but might as well use what i have got. Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 22, 2005 Share Posted March 22, 2005 Cheers Chris for the great job (once again), I had a REALLY enjoyable drive home. No worries mate. Only just finished, been fitting an LSD in a Soarer twin turbo. PITA job... Link to comment Share on other sites More sharing options...
dRuNk-mEdIc Posted March 23, 2005 Share Posted March 23, 2005 Hey Tom how are those Hybrid Turbos doing? They don't sell good in the states so there fore I didn't even get a chance to ask anyone about them. Link to comment Share on other sites More sharing options...
womble Posted March 23, 2005 Share Posted March 23, 2005 I've just fitted a set of technics hybrids, my car is UK spec in top condition, IK24, FCD, Bleed valve, full decat 3'' pipe, TRD air filter. When I boot her she hits and holds (quite easily) 1.45 bar which is quite worrying (even with the bleed valve completely closed). I dont really understand this. Another friend has exactly the same problem on his UK spec after fitting hybrids. I'm taking her to C.W tomorrow to have his SMIC fitted and a closer look at the boosting, may need to have a restrictor ring fitted. I know this is standard practice on the Jspec after BPU, but is this normal on a UK? Cheers Looks like our cars are pretty similar spec wise. I'll be getting a CW intercooler fitted in a few weeks too. Did it feel much different after having your (intercooler) fitted ?. Link to comment Share on other sites More sharing options...
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