I built new timing tables from the stock 98 5.2L tables and the tables from a 5.9L 98 Jeep Grand Cherokee. The Jeep tables are known to be some of the most agressive stock tables around, so which ever was higher for a particular cell, I would use it. We bumped the idle by 50 rpm and did a few other little things as well.
We uploaded the new tune and it really spunked it up. The scanner portion (for dataloggjng) of HPTuners is not working properly yet so we.do not have any data. It will connect to the car but the scanner function never displays any live data. For now, we will just log it with Torque Pro on my phone. We have been taking it easy on this engine and have not gone wide open throttle at high RPM yet.
Now. The valvetrain noise is really starting to bug me. I did some measuring and I think we may be exceeding the lift capabilities of our stock rocker arms. I believe the slots in the bottom of the rockers may be limiting our valve lift and making noise in the process not to mention stressing the entire valve train. Fortunately for us the 83GT is being taken apart so I test fit a Ford Racing 1.7 roller rocker arm on the old Durango engine and it looks to be a good fit. They get awfully close to the stock retainer. Our Crower retainers are recessed around the valve stem so they should fit better. I have read where others have used these rockers with success so I wanted to check for myself. I just hope they clear the baffles inside the valve covers. If this doesn't cure our valve train noise next we will look at pushrod length and probably change the lifters to the stock style lifter.
We uploaded the new tune and it really spunked it up. The scanner portion (for dataloggjng) of HPTuners is not working properly yet so we.do not have any data. It will connect to the car but the scanner function never displays any live data. For now, we will just log it with Torque Pro on my phone. We have been taking it easy on this engine and have not gone wide open throttle at high RPM yet.
Now. The valvetrain noise is really starting to bug me. I did some measuring and I think we may be exceeding the lift capabilities of our stock rocker arms. I believe the slots in the bottom of the rockers may be limiting our valve lift and making noise in the process not to mention stressing the entire valve train. Fortunately for us the 83GT is being taken apart so I test fit a Ford Racing 1.7 roller rocker arm on the old Durango engine and it looks to be a good fit. They get awfully close to the stock retainer. Our Crower retainers are recessed around the valve stem so they should fit better. I have read where others have used these rockers with success so I wanted to check for myself. I just hope they clear the baffles inside the valve covers. If this doesn't cure our valve train noise next we will look at pushrod length and probably change the lifters to the stock style lifter.
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