GeraldJ Posted March 15, 2010 Report Share Posted March 15, 2010 So it would "behove" someone to use the turbo cam gears? I am using the NA intake cam and the turbo exhaust set at 4-4. So my intake is closer to 0 or -1? On the intake temp sensors try this website, My link I am going to be using this sensor, My link, scroll down to the air temp sensor. I am going to have a bung in the cold side, hot side and the intake. I cant monitor all at the same time, but I will be able to move the sensor from one to the other for different pulls. Im also using the Zeitronix zt-2 system Quote Link to comment Share on other sites More sharing options...
JCviggen Posted March 15, 2010 Report Share Posted March 15, 2010 (edited) Gerald, your intake will be about +4 and exhaust around 0. So you've moved them in the wrong direction in terms of overlap. 0 intake +8 exhaust on the NA gear would be about stock turbo cam timing (and much better IMO) Edited March 15, 2010 by JCviggen Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted March 15, 2010 Author Report Share Posted March 15, 2010 Gerald, your intake will be about +4 and exhaust around 0. So you've moved them in the wrong direction in terms of overlap. 0 intake +8 exhaust on the NA gear would be about stock turbo cam timing (and much better IMO) It depends on whether he used the NA gear as well - need to check the location of his reference marker if he used the NA gear... Quote Link to comment Share on other sites More sharing options...
JCviggen Posted March 15, 2010 Report Share Posted March 15, 2010 Right, my reading isn't up to par recently...thought he had both NA cams. Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted March 15, 2010 Author Report Share Posted March 15, 2010 Right, my reading isn't up to par recently...thought he had both NA cams. It wouldn't matter - it's the exhaust cam gear that is the issue. Quote Link to comment Share on other sites More sharing options...
GeraldJ Posted March 15, 2010 Report Share Posted March 15, 2010 Im using the stock turbo exhaust cam and the NA intake cam and cam gear. Its only temparary till my custom cams are done. Then I will just use the turbo cam gears. But until then i would like to have the timing right. :D Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted March 15, 2010 Author Report Share Posted March 15, 2010 Im using the stock turbo exhaust cam and the NA intake cam and cam gear. Its only temparary till my custom cams are done. Then I will just use the turbo cam gears. But until then i would like to have the timing right. The NA int gear has the same reference marker as Turbo: marker = 0* (cam centered in slots) How did you come to a decision on the appropriate cm profile? I'm starting to think maybe I should consider going this route to open it up more :rolleyes: Quote Link to comment Share on other sites More sharing options...
GeraldJ Posted March 15, 2010 Report Share Posted March 15, 2010 The NA int gear has the same reference marker as Turbo: marker = 0* (cam centered in slots) How did you come to a decision on the appropriate cm profile? I'm starting to think maybe I should consider going this route to open it up more A lot of measuring and trusting the grinder himself. I told him to shoot for more mid range tq and top end. Lets face it, its a street car and I use 3-5k rpm more than I use 1-3 or 5-7. If I remember right it came out to 10.5mm of lift and 270* duration intake and 10mm x 270*. Ill get back with the grinder and see what it was exactly. Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted March 15, 2010 Author Report Share Posted March 15, 2010 Log from this morning with the cams where they should be little inconsistent, as I was not steady on the pedal, took 14sec to go from 60-120 Probably could do better if I wasn't so nervous - that last 110-120 seems to take for ever... Timing looks good. Running the rpm's that high fills the catch can pretty quick. Took about 1/3 cup, and I had drained it yesterday. EDIT: CatchCan was fine today (3/16), after similar runs, so I must have slightly overfilled the oil level on Saturday when I did the work. Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted March 15, 2010 Author Report Share Posted March 15, 2010 On the intake temp sensors try this website, My link I am going to be using this sensor, My link, scroll down to the air temp sensor. I am going to have a bung in the cold side, hot side and the intake. I cant monitor all at the same time, but I will be able to move the sensor from one to the other for different pulls. Im also using the Zeitronix zt-2 system The auber probe is way too cumbersome, unfortunately. I had conversed via email with them on this item. Not sure what to do - I don't really want yet another gauge. I'm thinking maybe I should modify the ambient temp sensor to fit in the charge pipe, and just use the indash gauge. I really don't need to know ambient as much as intake & charge temps. Quote Link to comment Share on other sites More sharing options...
GeraldJ Posted March 15, 2010 Report Share Posted March 15, 2010 The auber probe is way too cumbersome, unfortunately. I had conversed via email with them on this item. Not sure what to do - I don't really want yet another gauge. I'm thinking maybe I should modify the ambient temp sensor to fit in the charge pipe, and just use the indash gauge. I really don't need to know ambient as much as intake & charge temps. I sold all my gauges and bought the Zeitronix system. I figured it was the best way to go and not have 6 gauges in the car. Shop around and they are easy to find cheap. Seems people buy them and run scared when they see the wiring for them, when really its simple. I picked mine up new in the box for $225 shipped of craigslist. It came with the ZT-2 and the lcd display along with the egt probe and a map sensor. The only problem was that the map was a 3 bar and the Zeitronix doesnt have scaling for the 3 bar, only 3.5, 5 and 10. So I ordered a 5 bar from an ebay vendor for $60 shipped. Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted March 15, 2010 Author Report Share Posted March 15, 2010 I sold all my gauges and bought the Zeitronix system. I figured it was the best way to go and not have 6 gauges in the car. Shop around and they are easy to find cheap. Seems people buy them and run scared when they see the wiring for them, when really its simple. I picked mine up new in the box for $225 shipped of craigslist. It came with the ZT-2 and the lcd display along with the egt probe and a map sensor. The only problem was that the map was a 3 bar and the Zeitronix doesnt have scaling for the 3 bar, only 3.5, 5 and 10. So I ordered a 5 bar from an ebay vendor for $60 shipped. If the sensor comes with a spec sheet, can you lmk what the operating range & voltage signal is? no real info on the site. Quote Link to comment Share on other sites More sharing options...
GeraldJ Posted March 16, 2010 Report Share Posted March 16, 2010 If the sensor comes with a spec sheet, can you lmk what the operating range & voltage signal is? no real info on the site. this is the same thing And most GM AIT sensors are the same thing. They operate on a range or -40 - 300*F and I am not sure of the signal. Quote Link to comment Share on other sites More sharing options...
lookforjoe Posted March 16, 2010 Author Report Share Posted March 16, 2010 this is the same thing And most GM AIT sensors are the same thing. They operate on a range or -40 - 300*F and I am not sure of the signal. " produce a variable resistance from 100K-50 ohms." OK - so the signal is a resistance from 100K - 50ohms. What I need to determine now is what the resistance values of the stock ambient temp sensor are. If the ranges are similar, then I can use on of these to display charge air temp on the info gauge EDIT: ordered the sensor w/pigtail & 3/8 aluminum bung from diyautotune. 4th gear log from this AM - looking pretty good overall - a couple of slightly lean spots 20psi tune level into steep uphill grade Quote Link to comment Share on other sites More sharing options...
EricF Posted March 16, 2010 Report Share Posted March 16, 2010 4th gear log from this AM - looking pretty good overall - a couple of slightly lean spots 20psi tune I think that's some progress. Looks like you have some decent timing for the most part, and your AFRs are nice. The one spot it gets to 13:1, it's well past the torque peak. I bet it feels decent up top, despite your cam timing... How does it feel? That sure does for all the world look like a knock event around your boost threshold and retarded timing as a result. If you could just get more ignition timing from 4100-5500.... This morning (after driving the company van for a week because I kept parking it behind the 850), the stars aligned and I was stopped at a light by myself on a normally busy road with no one ahead of me or behind me... Got to row through the gears a little before coming up on some traffic :) 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.