Bowtie70SS Posted October 25, 2007 Report Share Posted October 25, 2007 I have been through many trials and tribulations with my truck. In fact I am getting almost sick of it, almost that is. My most recent problem is that it seems like I am only building about 6 pounds of boost where I used to get 9-9.5. I have a maggie with a 2.9 pulley, engine is stock, gutted cats, custom tune. I have had 3 engines and 4 transmissions in this truck and I have it about back to normal till this. The things I have checked are: Vacuum/boost leaks at line, loose intake bolts, marked crank bolt/pulley to check for slippage, replaced Gatorback with a new one 110.5 inches(old one was glazed I know it was slipping when it got wet) . What else? Do the bypass valves fail? I'm at a loss here. Thanks!! Dave Quote Link to comment Share on other sites More sharing options...
04CHASE Posted October 25, 2007 Report Share Posted October 25, 2007 just wondering why you have had 3 engines? leakdown test? Quote Link to comment Share on other sites More sharing options...
Bowtie70SS Posted October 25, 2007 Author Report Share Posted October 25, 2007 (edited) 3 Engines...Let's see #1 was due to a clogged catalytic converter(melted the rings to the 3 pistons). Engine #2 was a botched build by a local "reputable builder" where the loosest cylinder had .100 skirt clearance tightest was about .035 on Mahle forged pistons (calls for .025) sounded like a diesel had a ton of blowby. #3 is alive and well but just a 10K mile LQ9 pullout from a Escalade. 4 Transmissions #1 Stocker gave up at 65K burnt high gear clutches. #2 Broken output shaft. #3 Broken output shaft and everything else inside. #4 Alive and well with a billet output shaft. I reused my shift kit, Billet servos, valves and converter on all of them. So you see why I may be just a little frustrated. The worst part is I can blame no one but myself. Dave Edited October 25, 2007 by Bowtie70SS (see edit history) Quote Link to comment Share on other sites More sharing options...
04CHASE Posted October 25, 2007 Report Share Posted October 25, 2007 (edited) 3 Engines...Let's see #1 was due to a clogged catalytic converter(melted the rings to the 3 pistons). Engine #2 was a botched build by a local "reputable builder" where the loosest cylinder had .100 skirt clearance tightest was about .035 on Mahle forged pistons (calls for .025) sounded like a diesel had a ton of blowby. #3 is alive and well but just a 10K mile LQ9 pullout from a Escalade. 4 Transmissions #1 Stocker gave up at 65K burnt high gear clutches. #2 Broken output shaft. #3 Broken output shaft and everything else inside. #4 Alive and well with a billet output shaft. I reused my shift kit, Billet servos, valves and converter on all of them.So you see why I may be just a little frustrated. The worst part is I can blame no one but myself.Dave trust me man i know. ive been through 3 engines and 5 trannies and these things will happen ii get upset sometimes too but i remember its just a hobby and say to myself it will run good one day . .do you have a way to log? belt slip could be a problem still . how did you mark your crank pulley? when i pinned mine the first time around the bolt would spin with the pulley and when i went to remove the bolt it wasnt even tight i unthreaded it with my fingers. what size pulley are you running? if your running a maf tune you could check to see what your maf lb/min is pulling in to tell if you have a vacuum leak Edited October 25, 2007 by 04CHASE (see edit history) Quote Link to comment Share on other sites More sharing options...
Bowtie70SS Posted October 25, 2007 Author Report Share Posted October 25, 2007 I maked the crank pulley with a paint pen. I checked the balancer bolt and it is tight. I do have HP tuners to log with. I was using a piece of nylon to cover my air filter. I took it off of there today and it seems that was my problem? I didn't make a full pass on it but it builds boost better/quicker. I am swearing off of mods for now with the exception of a 2 bar tune in tune near future. Thanks for the replies I'll keep yall posted. Dave Quote Link to comment Share on other sites More sharing options...
cadowns Posted October 26, 2007 Report Share Posted October 26, 2007 If you want to use a filter cover here is the Best on the market. Outerwears.com I have used one of their products for years and they are great. There have been tests to prove that the air flow is not impeded by using this as a pre filter. If you have a K&N filter # just call them and they will either have the right size or make it. Other wise have the dimensions when you call the 800 #, they will hook you up . CD Quote Link to comment Share on other sites More sharing options...
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