majority of ebay chips are one of 5 things.. complete rubbish, a copy of active autowerks, a copy of mark d, a copy of jim c or a copy of an alpina B3 chip. just dont confuse mine with any of those because i also list a couple of mine on ebay though mine are probably harder to find amidst the flood of weak or copied stuff.
also all ebay HP claims are bogus.. even HP claims on websites are usually overestimated because lets face it, people will buy more of something that lies and says +30hp as apposed to something well tuned with an honest gain figure of say +5 to 15hp. you see bigger numbers and think its a better chip/tune. its all a business ploy though, this is why i try to avoid HP gain talk on my stuff, i have bought chips from AA, JC, mark d, dinan, autothority, etc, etc. and run them in my own M20 to compare with and further my own tune and even at that peak gains are not earth shattering so id hate to see how the claimed gains on cheap crap stack up to actual gains.
also folks out there who do work alot with these motronic systems and sell decent quantities of chips usually have a supplier for blank chips sussed out. if you think you cant get an m27c256-10f1 or -12f1 for less than about $30 you would shit a brick if you knew what i pay per unit on the blanks i buy in bulk.. lol
i really cant get across just how much of a difference there is between "good" tunes and good tunes so heres a visual reference. here you have a typical M20 low part throttle ignition timing map, most of the "good" aftermarket tunes are this shape and in a similar ballpark timing wise, a bit over stock but with lots of room for improvement. 99.99% of aftermarket tunes retain stock shape and are essentially just "bumped up" a little from stock.
and here is my own personal low part throttle ignition map.. dont think i really need to say anything here, there is an absurd difference in <50% load power and overall feel between the two maps shown here lol
also all ebay HP claims are bogus.. even HP claims on websites are usually overestimated because lets face it, people will buy more of something that lies and says +30hp as apposed to something well tuned with an honest gain figure of say +5 to 15hp. you see bigger numbers and think its a better chip/tune. its all a business ploy though, this is why i try to avoid HP gain talk on my stuff, i have bought chips from AA, JC, mark d, dinan, autothority, etc, etc. and run them in my own M20 to compare with and further my own tune and even at that peak gains are not earth shattering so id hate to see how the claimed gains on cheap crap stack up to actual gains.
also folks out there who do work alot with these motronic systems and sell decent quantities of chips usually have a supplier for blank chips sussed out. if you think you cant get an m27c256-10f1 or -12f1 for less than about $30 you would shit a brick if you knew what i pay per unit on the blanks i buy in bulk.. lol
i really cant get across just how much of a difference there is between "good" tunes and good tunes so heres a visual reference. here you have a typical M20 low part throttle ignition timing map, most of the "good" aftermarket tunes are this shape and in a similar ballpark timing wise, a bit over stock but with lots of room for improvement. 99.99% of aftermarket tunes retain stock shape and are essentially just "bumped up" a little from stock.
and here is my own personal low part throttle ignition map.. dont think i really need to say anything here, there is an absurd difference in <50% load power and overall feel between the two maps shown here lol
I can pretty much say it's probably over-advanced, especially at peak torque. there is good reason for the shape of the stock curve. yes, the magnitude can use improvement, but you have, way, way, way too much timing at peak torque. You'd likely see a real performance increase by dropping that and following a similar shape to stock.
You don't tune a timing map by increasing advance until it knocks. It just doesn't work that way. Not unless the engine is a piece of crap and is severely knock limited, but the M20 is not.
But, you'll never dyno it or prove any real evidence, so I'm just wasting my breath..
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