Homer Posted August 11, 2006 Share Posted August 11, 2006 Is it likely to cause problems momentarily hitting 1.6+ bar on the stock turbos? Today I forgot I hadn't set up the bleed valve and took it for a run... after booting it in 2nd I thought 'holy f**k this is too quick' so let off the gas and remembered the bleed valve... The boost gauge recall showed just over 1.6 bar (plus my gauge reads low). Did a couple of short blips on boost, I simply cannot believe how quickly it spools up like this, even at 4k rpm it goes from 0 to 1.5 bar is a fraction of a second! Just a shame the turbo's can't last like this! Quote Link to comment Share on other sites More sharing options...
Class One Posted August 11, 2006 Share Posted August 11, 2006 Did a couple of short blips on boost, I simply cannot believe how quickly it spools up like this, even at 4k rpm it goes from 0 to 1.5 bar is a fraction of a second! Just a shame the turbo's can't last like this! Trying to blow them up then? Quote Link to comment Share on other sites More sharing options...
Homer Posted August 11, 2006 Author Share Posted August 11, 2006 Trying to blow them up then? Not on purpose (honest!). PS: Had some issues with the taxman while you were away and nearly sold up! Back on track now thought Quote Link to comment Share on other sites More sharing options...
wkdtime Posted August 11, 2006 Share Posted August 11, 2006 Lol...Throttle happy are we huh? Boost like that for a split moment isnt too bad, if the peak boost period was long enough your FCD would have come into play. Are you still under boosting? (without MBC) Quote Link to comment Share on other sites More sharing options...
Homer Posted August 11, 2006 Author Share Posted August 11, 2006 Lol...Throttle happy are we huh? Boost like that for a split moment isnt too bad, if the peak boost period was long enough your FCD would have come into play. Are you still under boosting? (without MBC) I know it'll hit huge boost without the FCD kicking in, but am concerned if a large, short burst has any immediate effect on the turbo or engine (det). It popped and banged a sh*t load after lifting off, something it doesn't normally do. I've fitted a bleed valve so the days of underboosting are over. Hope to set it up tomorrow and be ready for some 1.2-1.3 bar runs at Pod on Sunday if the weathers good. Quote Link to comment Share on other sites More sharing options...
Terminator Posted August 11, 2006 Share Posted August 11, 2006 Way out of the efficiency map, no point, unless you dont like your current turbos and you want to replace them very soon. Quote Link to comment Share on other sites More sharing options...
Homer Posted August 11, 2006 Author Share Posted August 11, 2006 Way out of the efficiency map, no point, unless you dont like your current turbos and you want to replace them very soon. 1.2-1.3 bar? I know 1.6 (or above 1.2 aparently) is pointless on stock turbos but am concerned what effects this could have had on then engine or turbo... Quote Link to comment Share on other sites More sharing options...
wkdtime Posted August 11, 2006 Share Posted August 11, 2006 1.2-1.3 bar? I know 1.6 (or above 1.2 aparently) is pointless on stock turbos but am concerned what effects this could have had on then engine or turbo... Long burst over 1.3 bar would most likely result in the engine running very lean and det occuring, melting pistons, and all this before the tubbies would even die! But with the mods (New I/C, pump etc) you have in place Darryl running 1.2-1.3 Bar would most likely worst case scenario result in early turbo failure if anything, and no damage to the engine as long as you can keep an eye on the AFR's and EGT'S. Quote Link to comment Share on other sites More sharing options...
Homer Posted August 12, 2006 Author Share Posted August 12, 2006 Thats the same conclusions I had drawn. With the spool up being so fast the AEM AFR gauge can't react quick enough, so I have no idea if it ran lean (it's normally incredibly rich at 1 bar throughout the range). Guess only time will tell (32k miles BPU and still going strong - lets up the stakes!) Quote Link to comment Share on other sites More sharing options...
wkdtime Posted August 12, 2006 Share Posted August 12, 2006 Thats the same conclusions I had drawn. With the spool up being so fast the AEM AFR gauge can't react quick enough, so I have no idea if it ran lean (it's normally incredibly rich at 1 bar throughout the range). Guess only time will tell (32k miles BPU and still going strong - lets up the stakes!) Darryl, if you want my opinion then wait till you have an EBC (you'll need one when your single anyway) and then up the boost, this way the boost spikes will be more controllable (especially with winter comming up) as MBC's are prone for serious boost spiking with higher loads. Quote Link to comment Share on other sites More sharing options...
supRo Posted August 12, 2006 Share Posted August 12, 2006 Darryl, I wouldn't worry too much mate if it's running ok. Similar thing happened to me nearly two years ago. Car is still running well. I'm thinking of going SP on Sunday too - You have PM! Ro Quote Link to comment Share on other sites More sharing options...
JohnA Posted August 12, 2006 Share Posted August 12, 2006 At 1.6 with a normal JSpec you don't get a whole lot more air than with 1.3, so fuel-wise you're not that off. It's the extra *heat* that could do damage, but if you are doing high speeds it takes a few seconds for it to build up in the chambers - it's not momentary. You really risk popping-off the ceramic turbines though, and potentially scoring the turbo shafts and thrust bearings as well (also depends on how good/fresh your oil was at the time) Quote Link to comment Share on other sites More sharing options...
Pig Posted August 12, 2006 Share Posted August 12, 2006 Morning Homer, im not going to say what i think, cause i dont know. One thing i do know is that secretly you wish they had gone pop Quote Link to comment Share on other sites More sharing options...
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