NS turbos running 10psi on stock ECU
06-24-03, 12:54 AM
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NS turbos running 10psi on stock ECU
hey every1...i found this and was wondering if anybody had some opinions on it.
it makes logical sense...but i have this one webpage of a guy testing out ALL sorts of combos on the stock ECU to see if it would lean out, and he ran an intake, and straight exhaust with 14psi from the twins with no problem...
lemme know what u think
-Zach
I don't have an ecu yet, and Dave mentioned that running non-seq with anything more than 7 or 8 psi is dangerous, and here's why: The stock ecu knows that there is a dip in boost at or around 4200 rpm, and adds less fuel during the transition period. While turbos are non-seq, obviously there is more than the prescribed transition boost at this point, hence running lean and engine go boom.
lemme know what u think
-Zach
06-24-03, 12:55 AM
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06-24-03, 01:19 AM
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Re: NS turbos running 10psi on stock ECU
Originally posted by teamstealth
it makes logical sense...but i have this one webpage of a guy testing out ALL sorts of combos on the stock ECU to see if it would lean out, and he ran an intake, and straight exhaust with 14psi from the twins with no problem...
-Zach
it makes logical sense...but i have this one webpage of a guy testing out ALL sorts of combos on the stock ECU to see if it would lean out, and he ran an intake, and straight exhaust with 14psi from the twins with no problem...
-Zach
Wade's testing on the stock ecu was at 10 psi only. All of the entries above 10 psi were with the PFS PMS piggy-back computer.
I would be silly to argue against Dave, but his statement doesn't make sense. The stock ecu has a higher maximum boost level at transition, as if Mazda realized it might spike there. Therefore, it doesn't make sense that they would simultaneously REDUCE the fuel injected at that time. And my A/F plot doesn't support Dave's statement either....
Running non-sequential with the stock ecu is like running any other airflow mod, in essence. You are increasing the air flow over stock (for a certain rpm range anyway). Whether you run lean or not is dependent on your individual car.
I will say this, however. I have an A/F plot of my car from the dyno. The A/F with the stock ecu at 3000-4500 (the range where you are flowing more air than sequential twins) starts at 12.3:1 and ramps down to 10.5:1 at transition. I would be concerned about that early 3000 rpm area with running non-sequential on the stock ecu. All that said, quite a few people are doing it....
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