stumpy73 Posted March 4, 2016 Posted March 4, 2016 Hi had engine tuned few months ago now in 5th gear when on boost you can feel the boost fluctuat,you can also see it on boost gauge. Any help would be great.
stumpy73 Posted March 4, 2016 Author Posted March 4, 2016 If I start building boost up boost n get just below 1bar it starts jumping up to bout 2bar.if I give it more throttle it stops.
Tidgy Posted March 4, 2016 Posted March 4, 2016 Sounds like maybe hitting boost cut, sounds like an issue with mapping if it stared doing it after that.
GeoffLeggy Posted March 4, 2016 Posted March 4, 2016 If its fine in all other gears it does seem a bit odd. Boost spiking to 2 bar is very dangerous! Has it been doing it ever since the map or just recent? Id def get on the phone to the mapper and ask them.
Scoobyghost Posted March 4, 2016 Posted March 4, 2016 Mine only boost cut in 4th and 5th after being mapped.
GeoffLeggy Posted March 4, 2016 Posted March 4, 2016 @Scoobyghost would you get spiking like that too?
stants Posted March 4, 2016 Posted March 4, 2016 What where your mapping goals ? How much did the mapper wind the boost up to &do you have a two or three port soliniod Sounds like overboost as opposed to cut, I'd start by checking wasetgate, boost solinoid & hoses all could be a culprit,
stumpy73 Posted March 4, 2016 Author Posted March 4, 2016 I will do.thanks.as far as am aware he opened the turbo rite up.i think its a 2port,does any body know where to get wind deflectors for 2002 scoobie?
Scoobyghost Posted March 4, 2016 Posted March 4, 2016 Mine was due to hitting the limit. Wouldn't spike. Target was 1.3 I hit the limit 1.4bar. 1
aucky Posted March 4, 2016 Posted March 4, 2016 these are the only wind deflectors i have ever found for the bug,was going to get some when i had my wagon,depends what you want to pay though as you will have inport tax as well, https://www.japanparts.com/parts/detail/3483
GeoffLeggy Posted March 4, 2016 Posted March 4, 2016 3 hours ago, Scoobyghost said: Mine was due to hitting the limit. Wouldn't spike. Target was 1.3 I hit the limit 1.4bar. Ok so your getting exactly what I have at the moment on the secondary, just fuel cut like a brick wall lol? You getting it adjusted or just living with it?
stumpy73 Posted March 4, 2016 Author Posted March 4, 2016 Prob get it adjusted soon when get others mods done,av found some deflectors on eBay bout £80 plus £40 delivery from America 1
Scoobyghost Posted March 4, 2016 Posted March 4, 2016 Mine was due to hitting the limit. Wouldn't spike. Target was 1.3 I hit the limit 1.4bar. Ok so your getting exactly what I have at the moment on the secondary, just fuel cut like a brick wall lol? You getting it adjusted or just living with it? Yeah it was like someone slammed brakes on. No, I contacted Dunc straight away and he came to my house to tweak the map. He increased my limit. I can hit 1.4bar in the top gears still it just doesn't cut anymore. Can't fault Duncan with the after care. Was with me within two weeks.
GeoffLeggy Posted March 4, 2016 Posted March 4, 2016 That is good service! Mines got to go in for some tweaks that being one of them. Not driving it much now but just have to stay south of 6800rpm in 3rd upwards.
savage bulldogs Posted March 4, 2016 Posted March 4, 2016 Normally a remap will be done with 3rd & 4th gear pulls but when under higher load conditions (in 5th , 6th, going uphill or even colder denser air) There's more pressure in the inlet manifold. This can cause a difference in of pressure in the boost control vac system. In turn creating a different boost pressure that the one set by the mapper and somtimes hitting the max pressure boost cut target set by him . Hence why my mapper tweeks the map at different driving conditions and throttle positions after each map [emoji6] If it's not broke .....upgrade it 😊 2
Scoobyghost Posted March 4, 2016 Posted March 4, 2016 I guess it's a downfall of dyno mapping. I'd only get it 110+ in 4th so right up high in the rev range like yourself Geoff.
stants Posted March 5, 2016 Posted March 5, 2016 I guess it's a downfall of dyno mapping. I'd only get it 110+ in 4th so right up high in the rev range like yourself Geoff. Just get it mapped to come in earlier [emoji12] Mine wheezes like an asthmatic donkey past 5k so no point going any further, almost like I'm driving a diesel [emoji23] 2
Tidgy Posted March 5, 2016 Posted March 5, 2016 Should always be road tested even if dyno mapped, any mapper not doing a road test is one to avoid. Also so post map boost cut shouldn't be an issue, if so need to go back to the mapper and get them to fix it.
Scoobyghost Posted March 6, 2016 Posted March 6, 2016 Indeed road test should be compulsory but there's not many places I'd trust to take my car on a joy ride.
GeoffLeggy Posted March 6, 2016 Posted March 6, 2016 Very true @Scoobyghost ,they'd also have to break a lot of speed limits to test it properly lol 1
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