I truely believe now that it's the first modification anyone should do for any computer controlled car before any money is spent on bolt on crap. Not to mention you can scan anytime you want, and diagnose any check engine lights you may have and exactly find the problem before you spend a dime buying parts and chasing the problem. The abilities are endless,and the satisfaction of tuning your own car and making your own changes as necessary at your own convenience makes it worthwhile. I agree with Richard,I jumped into the HPtuner software and I hate computers. I like the fact of it being done a dyno bcause you know right away when gains are made and if everything is good. And once you buy a full tune(usually about $550) its only like $30-$40 to do adjustsments afterwards or if they are really cool, they may just do it for free. They want the most out it too, they like seeing how much they can pull out. Most guys are really cool and never really diss your car. Research your shops first, ask if they have a GM guy or have tuned a few. I would wait untill your done modding your engine, get a full dyno tune and leave it at that. Although it is very cool to do things yourself, you can really mess some stuff up and end up paying again to get it fixed. if you read and look at other peoples' tunes in the repository and get a solid grasp of what you are doing you do not have to run the risk of having a problem!! the HPTuners crew provides an amazing amount of support for their product and if I can figure it out, anybody can! ![]() I spent the extra money to just do it myself, and when that car was wrecked it was free to tune my new car. I like the fact of it being done a dyno bcause you know right away when gains are made and if everything is good.on my old car, I had a tune done but it was a few years before I did my gear swap - the guys agreed to do adjustments at the time of the tune for free and then said that the gear adjustment would be $125 and a few other little things I had been wanting would also add up, grand total of $375. ![]() ![]() HPT vs other tuner packages seem to define this differently.IMO, I wouldnt do it yourself. Unclear what the diffrence between frequency and crank is, but the frequency setting may dictate a variable pulse width based square wave, vs a fixed pulse width. Corvette and GTO are default at frequency. HPT lists 3 options: Serial/frequency/crank. Depends on the actual tacho so some trial and error may be required. ![]() Some people use a 680ohm resistor from memory. The "pull up" resistor fits in as follows:ฤก2V +ve -1kOhm Resistor-Tacho input/E40 Tach line. E40's do output a square wave for Corvette's and GTO's as they use a discrete tacho feed vs the CAN/multiplexed feed. Here's a link, and do let me know if you figured it out without buying the #9117 adapter. From what I have read it may be that the LS2 ECU uses a multiplexing signal and the tach is looking for a square wave signal. I have an email into autometer to address it.
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