Hellas850 T-5 Posted July 21, 2006 Report Share Posted July 21, 2006 Hi again guys,I have an 850 chip tuned from SCT,I have changed the exhaust from cat. and back,and K&N air filter.My car accelerates like a rocket but in the middle rpm,while I'm moving.Many times when I start from 1st gear,and change all the gears to high rpm it seems like asomething to keep the car.the pressure most of the time is ok(1.2-1.3 overboost 0.9-1.0 stable)and stays.what should I check?These awful moments,I think many bad things for my car and makes me angry. :angry: Link to comment Share on other sites More sharing options...
prasamin Posted July 21, 2006 Report Share Posted July 21, 2006 Not sure what it could be....some type of fuel cut or spark blowout is all I can think of.check your spark plugs lately? Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted July 21, 2006 Author Report Share Posted July 21, 2006 I had a problemin the past with a strange cut-off,my"tuner" couldn't help me,so I found the solution myself.I changed the plugs(until now driven 5000km).I put NGK BKR EVX 11,I closed the gap to 0,65mm and is all right I think.During acceleration the engine revs go up with no misfirings,but I have the feeling that the power dissappears. Link to comment Share on other sites More sharing options...
TheMan5952 Posted July 21, 2006 Report Share Posted July 21, 2006 I had a problemin the past with a strange cut-off,my"tuner" couldn't help me,so I found the solution myself.I changed the plugs(until now driven 5000km).I put NGK BKR EVX 11,I closed the gap to 0,65mm and is all right I think.During acceleration the engine revs go up with no misfirings,but I have the feeling that the power dissappears.What octane fuel are you running? (serious question guys) Link to comment Share on other sites More sharing options...
maiku Posted July 21, 2006 Report Share Posted July 21, 2006 I had a problemin the past with a strange cut-off,my"tuner" couldn't help me,so I found the solution myself.I changed the plugs(until now driven 5000km).I put NGK BKR EVX 11,I closed the gap to 0,65mm and is all right I think.During acceleration the engine revs go up with no misfirings,but I have the feeling that the power dissappears.there's one mistakeDON'T use any other spark plugs except VOLVO COPPER PLUGSand i think you meant 0.065mm gap Link to comment Share on other sites More sharing options...
850boston Posted July 22, 2006 Report Share Posted July 22, 2006 check and tighten down on all of the clamps on the air intake. That worked for me anyway... Link to comment Share on other sites More sharing options...
TurboSam Posted July 22, 2006 Report Share Posted July 22, 2006 but I have the feeling that the power dissappears. one week after service i have the same feeling... Don't forget that a turbo car isn't runing that fine in summer like in winter. It's all about cool air ! 35 degree C are not really optimal... I don't know if others also have this problem but i can feel a huge difference between summer and winter. I like temperatures below 5 degree C modded intercooler and water injection may help ?!Sam Link to comment Share on other sites More sharing options...
freeskier8585 Posted July 22, 2006 Report Share Posted July 22, 2006 change those plugs with volvo coppers Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted July 23, 2006 Author Report Share Posted July 23, 2006 What octane fuel are you running? (serious question guys)Most of the times I run 100 octane,sometimes if I can't find it I run 95 octane. Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted July 23, 2006 Author Report Share Posted July 23, 2006 there's one mistakeDON'T use any other spark plugs except VOLVO COPPER PLUGSand i think you meant 0.065mm gap[/quote I've heard from many people that VOLVO plugs are better than the others,but I can't understand this.Anyway I'll follow your advice,because you know more than me!!! Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted July 23, 2006 Author Report Share Posted July 23, 2006 check and tighten down on all of the clamps on the air intake. That worked for me anyway...Do you mean before the turbo?Yesterday I changed the turbo hoses with the samco kit. Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted July 23, 2006 Author Report Share Posted July 23, 2006 one week after service i have the same feeling... Don't forget that a turbo car isn't runing that fine in summer like in winter. It's all about cool air ! 35 degree C are not really optimal... I don't know if others also have this problem but i can feel a huge difference between summer and winter. I like temperatures below 5 degree C modded intercooler and water injection may help ?!SamI want to change the intercooler but it is quite expensive(AUTOTECH),but I'll agree with you that will make a difference.About the water injection,I've seen some kit for VOLVO but I've also seen to some discussions that it isn't a good idea to install this system. Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted July 23, 2006 Author Report Share Posted July 23, 2006 :) Sorry for the delay to answer guys,but I was very busy at the workshop.Thank you all for your replys and advices. :) Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted July 27, 2006 Author Report Share Posted July 27, 2006 I believe that a main reason for the performance is the fuel quality. Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted July 30, 2006 Author Report Share Posted July 30, 2006 there's one mistakeDON'T use any other spark plugs except VOLVO COPPER PLUGSand i think you meant 0.065mm gapWhat is the part number for the OEM PLUGS?Thanks Link to comment Share on other sites More sharing options...
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