Originally Posted by
sc0rp7
All very well stated, and I think we agree in most aspects here..
I agree if you think that in the end you plan on building an eventual monster of some sort, you should consider going with the best upgrade for future mods as well. This may be a full top of the line stand alone EMS, especially with a new wiring harness and more capabilities, or it may be a simple RTEK 1.7 with 720cc secondaries and no control over AF ratios or timing whatsoever... Do the research and decide on what you believe your goals are, then buy whatever best suits your situation.
to reply to the key points mentioned kain:
1. You are completely correct about the S5 turbo's waste gate. I agree with everything you said whilst clarifying that it will normally start to creep on an exhaust with no restriction i.e. no catalytic converter, etc. and somewhere over 2 1/4" piping...
2. I was also referring to the lesser RTEK's that dont allow adjustments and will compensate because of the AFM reading a different amount of air taken in.
3. I agree with your logic and reasoning on the S5 AFM being a superior design (shape), but the fact remains that on the RX-7, S4 AFM is larger and therefore has very similar air flow characteristics. All I was saying here is that the S4 AFM isnt really worse than the S5, but that a restriction in air flow is a restriction in air flow, regardless of shape and they both cause very similar restriction.
4. Interchanging the S4 and S5 engines can be done, but if you have the correct series harness for your vehicle, aka: the correct series engine, then the ecu harness plugs directly into the factory dash harness of your vehicle rather than having to modify it as S4 and S5 dash harnesses are not the same and this is the connection where you connect to the ignition coils and get your factory power and ground from, etc. You get the idea, I was merely stating it was easier with the same series engine.
5. The 500 dollar thing, that goes back to my original statement of depending on application as well as depending on the budget you are working with.
6. I agree with everything you stated a RTEK cant do except for the twin fuel pump thing, you can run as many as you want. Wire a relay, wire a hobbs switch if you want the second one boost activated, whatever you require. Everything else goes back to choosing whats right for your application.
Your statement about people normally wanting more and more from a vehicle is very true. What most people in that situation lack is the ability to know when they have enough, before they start having to drop multiple thousands on that motor thats pinned, because they blew it apart, or that late S5 rear housing thats got a stronger casting, etc. Going bigger and getting more is not always better, because of cost most notibly.
I like your example, as you have a goal of where you are headed... Good luck and if it fits your overall goal and you know what you are doing then other peoples opinions dont really matter.
- Chris
. I'm not searching for big numbers. I just want a car I can have fun with. 300whp is where I want to top out with this car and it won't happen till probably jan 2011. If I can do it without spending a lot of money then that is a plus in my book.
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