ktm200 Posted June 16, 2017 Share Posted June 16, 2017 Just finished up a new short block Tuesday (also has rebuilt heads). Yesterday I was working on breaking it in. Did 50 miles then an oil change. During those 50 miles I followed the COBB website recommendations, no more than 3500rpm, stayed out of boost (less than 2psi), and just kept lightly accelerating (less than 30% TPS) then engine braking. Occasionally at the start of a slight incline (3rd gear 5EAT) right on a light throttle tip-in I would get quite a bit of feedback knock through the access port. Two occasions it bounced between -5.2 and -7, if I let off the throttle and got back in it went right away. This would be right around 2000-2500rpm. I know I've read under load and light throttle/low rpm these cars can record some knock, but this seemed a bit much for my liking. I checked all my hose connections and everything seemed good. I'm running the OTS COBB stg2 91oct map while using Shell 93 gas. (mods include a catted downpipe, AVO TMIC, VF-48 billet wheel). This something I should be worried about? Any ideas? I'm at about 90miles right now. COBB's article said to start going up to 40% throttle input from 100-500miles so I plan on keeping an eye on it to see if it continues with higher throttle inputs. I tried datalogging a few times on inclines, will take a look tonight. If I was able to catch any with the log I'll post them. It will be a while before I get enough miles to do a proper WOT log. Link to comment Share on other sites More sharing options...
Max Capacity Posted June 17, 2017 Share Posted June 17, 2017 Just asking did you do the first oil & filter change after the engine ran for 15-20 minutes ? Your using your stg2 tune to break in the engine, correct ? not some break-in tune ? I used my 21psi custom tune to break in my ej257. Just kept it out of any real boost for a short time. I'm not a fan of babying the engine. At 500 miles, after the 3rd oil change, we did a street tune just to make sure things were fine. Oil changes were at, 20 minutes, 100 miles, 500 miles. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
ktm200 Posted June 17, 2017 Author Share Posted June 17, 2017 Yes. Did an oil change after 20mins, then 50miles and will do another at 500mi and 1500mi. Just the basic Cobb stage 2 91oct tune, no break in specific tune. And same here, haven't really babied it, just stayed out of boost. For the first 100 miles was going between 2000-3500rpm and now I'm going 2000-4000rpm with a couple lbs of boost. I do plan to get a tune in a couple months. Just wanted to spread the costs out and get a couple more parts first. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.