| I shouldn't waste my time answering this, but here it goes: Why? Because I already have a JWT prom I'm mostly happy with. I'd be willing to give the Ash program a try, but not at such a premium. The discount is to entice those who already have someone else's program to make it worth trying something else. This is a fairly common tactic in various markets: offer a discount to a competitors customer to come over and try our product. Oh, and nobody touches my ECU. My ECU is already socketed and I'm intimately familiar with how to change the PROM. There are a lot of satisfied Ash customer's out there, but there aren't a lot of back to back dynoes on the same car with both programs showing AFR's no leaner than 11.5:1. Basically, I'd be will try try an Ash PROM for $200 given I already hae my ECU socketed and I'll do the install myself. More that, I'll stay with JWT until there are loads of back to back dynos. BTW, I'm in no way putting Ash down. I've read through most of his posts and he's very well spoken and I in principle agree with his methods (map expansion, 5th gear maps, detonation maps, etc). :if you notice any posts saying that you can or saying that its $250 are outdated. You have to buy Ash's ECU from Z1motorsports.
:Second, why would they give you a discount because you have somone else's eprom mapping? Its not exactly like they can use it. Its the equivilant of buying a Big Mac and taking it to burger king and asking them if you can get thier whopper for half price...
:It seems you need to know how aftermarket 'ECU's' are different from stock:
:The ECU itself isn't different. The changes are made in the programming of the eprom. Basically all of the fuel maps are changed to be more aggressive as well as the stock rev limiter being 'increased'(you have more available rpm before limiter kicks in). In some cases timing is altered, depending on chip and your setup.
:Other things may be factored in depending on the Z. If necessary changes are made to accomodate larger injectors, Nitrous use, dual pop chargers/dual MAS configs, etc. It can all be altered and 'tweaked' to make the most HP.
:So back to your question, if you have an ECU in your Z, and it has JWT's program and you want Ash's program then basically they will write over the JWT one with Ash's specs. In reality you will probably get a 'new' ECU with Ash's parameters already on it and then send them your ECU for the core refund. You'd be better off selling your JWT and then getting the Ash. my $0.02
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