squiffy Posted December 17, 2015 Share Posted December 17, 2015 (edited) Hi guys Since picking up my six speed, it's not been as quick as i expected. I found it hard to judge at first as it has been a year since i've had a quick car! i fitted a boost gauge at the weekend and confirmed what i thought! I'm only making 0.55 bar boost maximum. When i accelerate the gauge goes up to around 0.5bar on the first turbo. then at 4k revs, i feel the changeover as the 2nd turbo comes in. there is an increase in power, yet the boost stays at 0.5bar. sometimes spiking to 0.6 if i floor it on the motorway. Im thinking its a boost leak but also Its making me think i have a problem with the sequential valves? I'm going to have a look over the weekend to check the obvious bits, but worst case, Does anybody use any garages within reasonable distance from Portsmouth they would recommend? mods on the car: apexi intake hks cat back full decat dump valve i have some bpu bits to bolt on but obviously want to get it doing what its supposed to be before modding it further any help / pointers are appreciated Edited March 7, 2016 by squiffy (see edit history) Link to comment Share on other sites More sharing options...
TuneR Posted December 17, 2015 Share Posted December 17, 2015 Not even stock boost, is the gauge working ok? See if a fellow member can help to see if the car is running similar. Checking for leaks would be my first port of call afterwards. Link to comment Share on other sites More sharing options...
jonc Posted December 17, 2015 Share Posted December 17, 2015 First few things to check are: 1. Vacuum lines for splits, breaks or disconnecting 2. Your VSVs particularly the exhaust gas bypass valve which spins up the second turbo The VSV's can fail and/or they get brittle after years of sitting next to the turbos and the spiggots can break on them. I would check these areas first. Link to comment Share on other sites More sharing options...
Swampy442 Posted December 18, 2015 Share Posted December 18, 2015 Id also check the boost gauge, see if thats knackered or not Link to comment Share on other sites More sharing options...
squiffy Posted December 18, 2015 Author Share Posted December 18, 2015 Thanks for the pointers guys. It's a defi so I hope I can trust it, but I have a spare sensor I will try just in case Link to comment Share on other sites More sharing options...
TheTurtleshead Posted December 18, 2015 Share Posted December 18, 2015 If you need someone to come help diagnose your car I will be in Fareham over christmas. Let me know as I can bring some spare vsv's and bits and pieces down to trouble shoot. Link to comment Share on other sites More sharing options...
fastcar Posted December 18, 2015 Share Posted December 18, 2015 i had this problem! come down to a sticky VSV and the second turbo wasn't coming on line, took it off a soaked it in WD40 and working like new again. As said also check for leaks in the vac lines Link to comment Share on other sites More sharing options...
Hitbox Junkie Posted December 18, 2015 Share Posted December 18, 2015 Lee @ SRD is south coast. Down west Sussex. But great point above hopefully your get it sorted Link to comment Share on other sites More sharing options...
supra matt Posted December 19, 2015 Share Posted December 19, 2015 Put it in TTC mate if you want hand give me a shout Link to comment Share on other sites More sharing options...
squiffy Posted December 23, 2015 Author Share Posted December 23, 2015 Thanks guys, Pm sent to turtleshead Link to comment Share on other sites More sharing options...
supra matt Posted December 23, 2015 Share Posted December 23, 2015 It and better in ttc mate? Link to comment Share on other sites More sharing options...
squiffy Posted December 23, 2015 Author Share Posted December 23, 2015 It makes more boost, around 0.7 now. the lag is hideous though lol Link to comment Share on other sites More sharing options...
supra matt Posted December 23, 2015 Share Posted December 23, 2015 Lol you need to rip that first cat out mate that cure that lol Link to comment Share on other sites More sharing options...
Sheefa Posted December 23, 2015 Share Posted December 23, 2015 It makes more boost, around 0.7 now. the lag is hideous though lol Probably more boost as its a little colder now! Rip the twins out whilst your at it ! Link to comment Share on other sites More sharing options...
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