PoorMansPorsche 0 Posted November 7, 2008 alright peeps, I have seen and read the 15 page thread above but that seems more concerned with getting the 1.8T lump in ! anyway, since the C is a long distant memory ive now got a APU engined Passat Estate, its currently standard apart from a Remap which upped the power to 199 BHP which I am more than happy with BUT due to whatever reason the turbo doesnt really start kicking in at all til about 1900 rpm and only when it gets to 2500 rpm does it really start boosting and up until then what with it being a big ole beast its pretty gutless especially pulling away from a standstill. Is there anything that can be done to get the turbo kicking in earlier? Ive got a 4 branch, a bigger induction pipe and a decat pipe sitting in my garage waiting to go on - are these likely to help? as im not bothered about more power after 2500 rpm ??? Any thoughts would be appreciated ta Brett Quote Share this post Link to post Share on other sites
Rob_B 0 Posted November 7, 2008 NOS! if not you would need a custom map to get the actuator to close earlier and start making boost quicker Quote Share this post Link to post Share on other sites
Kevin Bacon 5 Posted November 7, 2008 Is it a Revo map? The last Revo I tried was in a Passat funnily enough and it felt like you describe. But a standard K03 engine should spool almost instantly if all is well in the engine room. First off, I would replace the easy things. MAF sensor, Recirc valve and fit the new N75J boost control valve if your ECU version will run it. It should do. If that doesn't solve it, get your ECU flashed back to standard and see if low rpm boost improves. If still no joy, it could be your turbo mate. How many miles has the engine done? Check the exhaust aswell. You may have a collapsed cat or silencer impeding flow. That has a huge impact on turbo spool. Your wastegate could be partially stuck open too.... Plenty of things to look out for with turbo engines unfortunately! Quote Share this post Link to post Share on other sites
Rob_B 0 Posted November 7, 2008 Is it a Revo map? The last Revo I tried was in a Passat funnily enough and it felt like you describe. But a standard K03 engine should spool almost instantly if all is well in the engine room. First off, I would replace the easy things. MAF sensor, Recirc valve and fit the new N75J boost control valve if your ECU version will run it. It should do. If that doesn't solve it, get your ECU flashed back to standard and see if low rpm boost improves. If still no joy, it could be your turbo mate. How many miles has the engine done? Check the exhaust aswell. You may have a collapsed cat or silencer impeding flow. That has a huge impact on turbo spool. Your wastegate could be partially stuck open too.... Plenty of things to look out for with turbo engines unfortunately! far more sensible than my suggestion, but mine would be way more fun!! :lol: Quote Share this post Link to post Share on other sites
Kevin Bacon 5 Posted November 7, 2008 Indeed..... but I had a bit of time spare so thought I'd bash up a few things to try :D Quote Share this post Link to post Share on other sites
junkie 0 Posted November 7, 2008 How can you fit a 4 branch to a turbo motor? As Kev says the wastegate should stay fully closed until the pressure to the actuator forces the spring to open the wastegate. Quote Share this post Link to post Share on other sites
Kevin Bacon 5 Posted November 7, 2008 Not easily or cheaply! I've not heard of many 1.8T wastegate problems to be honest, but it does sound kind of dudd MAF + Revo related to me.... Quote Share this post Link to post Share on other sites
PoorMansPorsche 0 Posted November 7, 2008 blimey - loads of replies anyway to start things, where the boost kicks in is exactly the same rpm as before the remap, i had it dyno'd and the charts were very very similar up until 2500 rpm when the extra 50 BHP becomes apparent I took a fair few passat 1.8T for test drives before i brought mine and they were all pretty much the same pull wise and none of them had a real noticable "kick" from the turbo, they were all estates and big ole beasts TBH, mine does run fine really i think, although if you really boot it the boost does seem a bit erratic over 4000 rpm and was smoother before the remap My car is on 70K and the MAF was the first thing i changed just for the sake of it and made no difference, i havent looked into the N75 as yet My map is supposedly a custom map but only because mine place are not VW specialists ! So the decat should help but was worried aboult EML's ? I havent got under the car yet but do 1.8T's have a rear lamda as well as front ones ?? cheers Brett Quote Share this post Link to post Share on other sites
