hodge Posted September 1, 2008 Share Posted September 1, 2008 Well I've done a search and couldn't finds definitave list which outlines the reasons for this so I thought I'd start one. Please feel free to add to the list if appropriate. Cheers guys 1) lack of fuel 2) poor intercooler I.e cooling Quote Link to comment Share on other sites More sharing options...
gaz1 Posted September 1, 2008 Share Posted September 1, 2008 restriction due to to small bore in the exaust, or cats still fitted Quote Link to comment Share on other sites More sharing options...
merckx Posted September 1, 2008 Share Posted September 1, 2008 It might be helopful you say where exactly your temp sensor is located and what temperatures you're getting. Quote Link to comment Share on other sites More sharing options...
bolarbag Posted September 1, 2008 Share Posted September 1, 2008 1) lack of fuel 2) poor intercooler I.e cooling Too much ign retard in the map? Without knowing what temps its hard to say but your ecu should compensate for No.2 in that list, as for No.1 how do you mean lack of fuel? Running lean? Then yes running around 12+ afr under wot should cause your egt's to rise Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 1, 2008 Share Posted September 1, 2008 Poor cam to tyro sizing, poor mapping. Quote Link to comment Share on other sites More sharing options...
n boost Posted September 1, 2008 Share Posted September 1, 2008 I'd say egt's can be sorted by adjusting timing on your map. U probably need a bit more advance to bring them down or add a bit of fuel. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted September 1, 2008 Share Posted September 1, 2008 In no particular order, 1 incorrect fuelling for load point (poor mapping) 2 incorrect ignition timing both too advanced and retarded can cause det, and high EGTs (poor mapping) 3 incorrect cooling both charge and high water temps. 4 bad cam timing. 5 restricted exhaust. 6 wrong octane fuel. 7 too much boost. Thats all i can think of at the moment. Quote Link to comment Share on other sites More sharing options...
MarkR Posted September 1, 2008 Share Posted September 1, 2008 faulty injectors? EDIT: Any issue in fuel system... (pump blocked filter etc...) Quote Link to comment Share on other sites More sharing options...
hodge Posted September 1, 2008 Author Share Posted September 1, 2008 Sorry guys I should have added my sensor is fitted pre turbos. My car is running BPU, here is a list of my mobs, at 1 point I hit 1000 degrees on my EGT gauge. J Spec auto TT. Ful Decat 1 bar restrictor ring. Walbro fuel pump Boost controller FCD FMIC Hybrid Turbos 1 bar low boost, 1.2 bar high boost. Blitz induction kit. Ported head. Rebuilt engine with stock internals.. The ECU hasnt been remapped and is still runing stock injectors and stock ECU. I had a suspicion that it was down to the injectors as there only 440's. Quote Link to comment Share on other sites More sharing options...
MarkR Posted September 1, 2008 Share Posted September 1, 2008 As far as I know, the 440's can do 1.1-1.2 (but it's pushing it..) Waits to be corrected Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted September 1, 2008 Share Posted September 1, 2008 Sorry guys I should have added my sensor is fitted pre turbos. My car is running BPU, here is a list of my mobs, at 1 point I hit 1000 degrees on my EGT gauge. J Spec auto TT. Ful Decat 1 bar restrictor ring. Walbro fuel pump Boost controller FCD FMIC Hybrid Turbos 1 bar low boost, 1.2 bar high boost. Blitz induction kit. Ported head. Rebuilt engine with stock internals.. The ECU hasnt been remapped and is still runing stock injectors and stock ECU. I had a suspicion that it was down to the injectors as there only 440's. You should be OK on std injectors, but only with some form of management and mapping, i am surprised at the high EGTs as with std map you should be on the rich/cooler side, i never saw 900c with my hybrids, and my sensor was in the first turbo housing. Quote Link to comment Share on other sites More sharing options...
hodge Posted September 2, 2008 Author Share Posted September 2, 2008 can anyone else shed any light on this. Quote Link to comment Share on other sites More sharing options...
MarkR Posted September 2, 2008 Share Posted September 2, 2008 Have you tried a different EGT sensor and gauge? Quote Link to comment Share on other sites More sharing options...
Alex Posted September 2, 2008 Share Posted September 2, 2008 (edited) You don't have enough fueling IMO especially if it's not mapped. I wouldn't dream of driving the car hard until I had 550's and an EMU/EMB mapped. Your midrange will have a hole in it the size of the watford gap. Edited September 2, 2008 by Alex (see edit history) Quote Link to comment Share on other sites More sharing options...
hodge Posted September 2, 2008 Author Share Posted September 2, 2008 a bpu supra will run all day on 440s. The only difference is the hybrids but I'm only running them at 1-1.2 bar. Please excuse my ignorance if I'm missing something odvious here. Quote Link to comment Share on other sites More sharing options...
dandan Posted September 2, 2008 Share Posted September 2, 2008 The hybrids are potentially a huge problem on those injectors at stock fuel pressure. The idea being that they shift more air for a given boost pressure.....so....you need more fuel to go with that. I'd forget comparing to stock turbos. Plus if the head has been gas flowed then the same argument stands, if the headjob was any good, you should be flowing a little more air for a given boost pressure. You need more fuel or at least an idea of if you are not supplying enough. Do you have an AFR gauge? Quote Link to comment Share on other sites More sharing options...
hodge Posted September 3, 2008 Author Share Posted September 3, 2008 I dont have an AFR gauge, think its the only gauge I dont have in the car to be fair. But yeah I see what you mean about the air. So would I be ok with 550 injectors and a fuel pressure regulator and what sort of fuel pressure should it be set at. Quote Link to comment Share on other sites More sharing options...
dandan Posted September 3, 2008 Share Posted September 3, 2008 I would say that 550 injectors will be capable of enough fuelling for pretty much any stock turbo based hybrid setup. You won't need to change the fuel pressure regulator or the fuel rail or any of the lines but you will need a resistor pack and something like and EManage or similar to get the fuelling correct once you fit the larger injectors. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted September 5, 2008 Share Posted September 5, 2008 I have run hybrids in TTC mode on 440cc injectors with no problems, in fact i was pulling quite a bit of fuel with the EMU, the only reason i fitted some 540cc injectors was to allow a little more headroom above 1.2 bar. Quote Link to comment Share on other sites More sharing options...
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