kenewagner
Registered User
Well I finally got everything lined up to tune the car. Dave flew in from Ohio to work his magic. We street tuned it Wednesday morning. Everything functioned like it should and idle and street manors are excellent. So we loaded it up and headed to Lincoln. Strapped it to the dyno and proceeded to make a few base line pulls. Waste gates have 14lb springs in them. It was boosting to around 10 to 11lbs of boost. Hp was in the 300 rwhp area, not really impressive I felt. Dave added some timing and we started dialing in boost. We quit at around 20lbs and 450 rwhp which I felt was low for my expectations. We could have dialed in some more boost and maybe a degree or so of timing and hit 475 to 480 but I called it quits for the time being as the tune is not super agressive and We felt there was something holding it back from making expected numbers. The really bad news is the full boost isnt there untill almost 5000 rpms makeing it a dog on the street or off the line in a quarter mile race. This is not what we expected and everyone was at a loss as to why it wont spool with small turbos. The water to air IC worked great and keep ACTs low. Hottest day of the year. 100 degrees in the dyno shop. Dave and I brained stormed a lot to try and figure out what is limiting the cars performance. Dave felt I needed to talk to the maker of the universal kit I used to fab up my system. I talked to STS tech guy yesterday and layed out to him the entire story and list of mods for the car. I sent him detailed pictures of how the system is set up and give him detailed information so he could evaluate the problem. He told the problem was very obvious. The cam in the car now, while great for a supercharger is totally wrong for a rear mount turbo. He spent about 20 minutes schooling me on the why and where withs of cams. Now before a lot of you guys with turbo cars jump in and say use this or use that. A rear mount turbo cam has to be a certain spec to work the best with a rear mount turbo setup. Cam specs are not the same as a front mounted turbo. We all know that to make the best HP possible we need a combination of modifacations that make sense and work together. My cam is speced out with lots of exhaust duration and lift, more so that the intake side. It also has a lobe seperation of 112. The recommendation given to me by STS was a lobe seperation of around 116 and they have installed one cam with 118. Second recomendation was to reduce the exhaust duration and lift dramaticly. Those two things alone would solve the poor spooling and its low power. He told me I would have made sick power if I had a closer to stock cam than the big stick in it now. The tech guy said he worked for a major cam company specing out cams for a living and seemed to have a good working knowledge of why the recommendations work. To bad I can remember everything he said. I plan to do some more looking in to this and talking to Dave about a cam to replace my bump stick. I hope to have a better recommendation today from STS as to what are good numbers for a new cam and discuss this with Dave. So unless I figured out something else wrong with the combination it looks like a cam change in the near future.
I would like to say that Dave was a wealth of information and worth bring him in to tune the car. He even made my dog fall in love with him and Benny one of the local SC guys has help me through fixing a lot of things and getting the car ready. Even solved a electrical problem keeping the alternator from charging the battery. Thanks to both of you
Ken
I would like to say that Dave was a wealth of information and worth bring him in to tune the car. He even made my dog fall in love with him and Benny one of the local SC guys has help me through fixing a lot of things and getting the car ready. Even solved a electrical problem keeping the alternator from charging the battery. Thanks to both of you
Ken