Quote:
Originally Posted by BeyondBiscuits2
I have a quick question about your fuel system. You said you tested your GA16DE using a complete SR20DE fuel system. Do you mean installing SR20DE injectors and plugging them into the stock harness and an SR20DE fuel pressure regulator without a different fuel pump, ECU, or MAF?
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Bob is correct, and no one knows more about these GA's than he does. In fact Bob was one of the very first cutting edge guys hot rodding GA16DE's back in the mid to late 90's. I learned from him [via Tim Mather's rally Sentra] that using the SR's injectors
without the matching SR air mass meter and ecu simply will not work correctly. It will be too rich. If you read some of Calum's threads on SR20forrums, you will see that although the SR and GA ecu's accomplish similar things, the electronics inside are very different regarding how they go about it. So you must keep the ecu/injector/air mass meter combos in the same family if not having the ecu reprogrammed.
Regarding the stock fuel regulator, I'm using the original GA piece. Same with the fuel pump. It's just the maf, ecu, and injectors from the SR that I am using.
There is one detail that I haven't finished with yet. The VTC system. Throughout all of these years I thought I knew how it worked, but I never really did until now. I always assumed that the intake cam was normally advanced for good off idle and low rpm power, and then retarded for more top end power after a certain rpm. After reading the factory manual, that's not how it works at all. To my surprise the intake cam's normal position is in the top end phase most all of the time. But under certain conditions: [engine coolant more than 158 deg. F, engine load high, and between 1,500 and 4,300 rpm's - and then again after 6,600 rpm's to keep you from blowing it up and warranty claims down] the ecu will turn the VTC solenoid on which advances the intake cam, which in turn shifts the torque curve to a
lower rpm in the band. This was quite a surprise to me. I have purchased an adjustable rpm "window" switch and will connect it shortly to turn on the VTC briefly between 1,500 and 4,000 or so like the factory did. Who knows, maybe it will spool the turbo quicker. I'll let you all know how it works out, but frankly I'm not expecting much from it.
