JamieP Posted February 13, 2007 Share Posted February 13, 2007 Ive had a boost problem with the car for a few weeks now, it will not boost above 1.2bar (will only just hit 1 bar in the first 3 gears) and is about 1000rpm more laggy than it was. i was hitting full boost average 3500rpm depending on gear and now its about 4500rpm. Changed the boost solenoid for a new one and fitted a boost controler instead of running of the AEM and no change. Checked all the boost pipes and cant find any leaks... striped down the wastegate today and there was a small split in the diaphram, i thought great we found the problem.... replaced the diaphram and its still the same:search: What to try next??? I was thinking of taking the IC of on saturday to pressure test it. Also possible problem could it be a leaking inlet manifold? Cant hear any leaks, and cant see a small leak making that much difference to spool and boost? The car ticks over fine and runs loverly, any suggestion of what to try would be great . Regards Jamie:) Quote Link to comment Share on other sites More sharing options...
Pig Posted February 13, 2007 Share Posted February 13, 2007 Watches with interest as my technical knowledge isnt up to this question Quote Link to comment Share on other sites More sharing options...
terribleturner Posted February 13, 2007 Share Posted February 13, 2007 Also possible problem could it be a leaking inlet manifold? Cant hear any leaks, and cant see a small leak making that much difference to spool and boost? Im thinking the above. Did Ian do his special test?? Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 13, 2007 Author Share Posted February 13, 2007 Im thinking the above. Did Ian do his special test?? Special test, whats that then? Quote Link to comment Share on other sites More sharing options...
terribleturner Posted February 13, 2007 Share Posted February 13, 2007 PM'd Quote Link to comment Share on other sites More sharing options...
Homer Posted February 13, 2007 Share Posted February 13, 2007 Has it ever managed to get past 1.2bar (since the engine build obviously)? Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 13, 2007 Author Share Posted February 13, 2007 Has it ever managed to get past 1.2bar (since the engine build obviously)? Yea was running 1.4bar, this all started about 3/4 weeks ago. Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 13, 2007 Author Share Posted February 13, 2007 PM'd nah he never did that. Quote Link to comment Share on other sites More sharing options...
AshBhp Posted February 13, 2007 Share Posted February 13, 2007 Jamie, have you done a boost leak test. Check the link out http://www.boostcreeps.com/phpBB/boostleaktester.php Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 13, 2007 Author Share Posted February 13, 2007 Thanks Ash ill give that a try:) Quote Link to comment Share on other sites More sharing options...
Nic Posted February 14, 2007 Share Posted February 14, 2007 it will not boost above 1.2bar (will only just hit 1 bar in the first 3 gears) What boost controller are you using? Some of the better ones allow you to map the boost settings against speed, which means you can maximise boost whichever gear you are in ie. you should be able to hit 1.2bar (or desired max) in every gear. Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 14, 2007 Author Share Posted February 14, 2007 AEM tru-boost. Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 14, 2007 Author Share Posted February 14, 2007 Ash im up Turbofit now and we just tried doing that test you linked, wow what a brilliant way of testing, ive got a couple of big leaks on the inlet manifold, thanks, Greg said give him a ring because he has a thank you for you:) Quote Link to comment Share on other sites More sharing options...
AshBhp Posted February 14, 2007 Share Posted February 14, 2007 Ash im up Turbofit now and we just tried doing that test you linked, wow what a brilliant way of testing, ive got a couple of big leaks on the inlet manifold, thanks, Greg said give him a ring because he has a thank you for you:) That's what it all about mate, sharing and careing. Glad you got sorted and let Greg now i be down one day for coffee. Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 14, 2007 Author Share Posted February 14, 2007 Turned out to be a few things. The rubber ring that seals the cold side on the turbo was leaking like mad, appeared to be be ok but would not seal, put one off a T70 on and it sealed great. One of the 90 degree bendes on the cold side was leaking, had a small split in it where i did up the jublie to tight. The Greddy inlet had a leak where it joins on the runners. Hopefully all sorted now, the boys are just putting the Tb back on now. Quote Link to comment Share on other sites More sharing options...
Gamer Posted February 14, 2007 Share Posted February 14, 2007 I want to have the same test done when mine is up there just for piece of mind. Quote Link to comment Share on other sites More sharing options...
terribleturner Posted February 14, 2007 Share Posted February 14, 2007 Yeah me too Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 14, 2007 Author Share Posted February 14, 2007 Arrrrgggg, the saga continues. All boost leaks now fixed and it holds pressure but its boosting very strange. 1st/2nd gear im getting 1 bar 3rd/4th 1.2/1.3 bar 5th 1.5bar My afr's are out now aswell, full wot im in the 12.1/12.3 range when before it was mid 11's so im not booting it now till Dan has checked it. Only thing i think it can be now is a wastegate issue so we are gonna swap it with another on saturday. what else could it be???? Quote Link to comment Share on other sites More sharing options...
Wez Posted February 14, 2007 Share Posted February 14, 2007 Glad to hear you are getting it sorted. I thought your boost control via the AEM was the AEM ECU not a seperate Tru-Boost controller. EDIT: I split a 90deg at the weekend, should be fitting replacement tomorrow Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 14, 2007 Author Share Posted February 14, 2007 Glad to hear you are getting it sorted. I thought your boost control via the AEM was the AEM ECU not a seperate Tru-Boost controller. EDIT: I split a 90deg at the weekend, should be fitting replacement tomorrow Hi Wez, I was running boost via the ecu but i thought id try a tru-boost BC just to eliminate if there was a problem with the settings. Quote Link to comment Share on other sites More sharing options...
AshBhp Posted February 14, 2007 Share Posted February 14, 2007 Have you tried disconnecting boost controller and work of waste-gate. What ever your spring rate is that what it should boost at. Quote Link to comment Share on other sites More sharing options...
JamieP Posted February 14, 2007 Author Share Posted February 14, 2007 Have you tried disconnecting boost controller and work of waste-gate. What ever your spring rate is that what it should boost at. Yea tried that mate, its a 0.8bar spring and works fine but still has the extra 1000rpm lag over what it was, wind the wastegate in a bit to raise boost and it does raise it but ony in the higher gears, basicly the same as the BC is doing. Quote Link to comment Share on other sites More sharing options...
supra matt Posted February 14, 2007 Share Posted February 14, 2007 Hi mate you would of had it mapped with the air leaks so now you fixed them all your going to see diffrent afr's , As it will be a sealed system now as to a leaky one , As for your boost settings is the with the boost controler off ! or on a or b setting ? Quote Link to comment Share on other sites More sharing options...
supra matt Posted February 14, 2007 Share Posted February 14, 2007 Yea tried that mate, its a 0.8bar spring and works fine but still has the extra 1000rpm lag over what it was, wind the wastegate in a bit to raise boost and it does raise it but ony in the higher gears, basicly the same as the BC is doing. sounds like waste gate leaking mate have you checked the manifold for any cracks around the take off for it ? Quote Link to comment Share on other sites More sharing options...
Wez Posted February 14, 2007 Share Posted February 14, 2007 In theory it will try and generate more boost in higher gears due to the extra load on the engine. What boost was it holding in each gear running from the just the wastegate set to 0.8bar? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.