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Originally Posted by orion::S14
To clarify one thing from above:
+250rwhp on the stock ECU is a BAD idea. Bad.
Timing is too aggressive.
No matter how much fuel you have, you need some timing retard to run more than 7-8psi.
Any decent sized turbo will give you 240-250rwhp at 7-8-9psi...any more power and you're just asking to break the ring lands.
SO...keep it safe for now, and run low boost ad make safe power.
When you can afford a retuned ECU, shoot for more.
- Brian
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Brian hit it on the button.
On a turbo application it is only natural to retard ecu ignition timing this means the maps are brought down from 20ATDC to about 9ATDC at idle and can be brought up more aggresive to 18 or 20ATDC by 6000RPMS (assuming that you would want to make 250whp). An SAFC wont change ignition timing.
The idea is to keep the plugs as cool as possible since the intial intake charge is increased which will drive cylinder temprature higher than normal. Now even if you used the stock ecu, I cannot comprehend why 550cc injectors would be used since the pulse width is too large for a stock ecu set up, even using an SAFC cannot calibrate injectors of that magnitude even if you were to use a wide band the maps still calibrate to a narrowband voltage. You also won't be able to boost passed 12 PSI with the stock ignition set up so the injectors are kind of pointless, more than likely have you running richer than a son of a bitch (which will decrease hp and probably cause backfire).
Even if you are a college student on low funds I don't see how you couldn't save up for a Biki rom for $300. Honestly downgrade the injectors to 440cc, and sell the SAFC that should be enough for a Biki.