I am currently working in my mechanical engineering hybrid car lab to try and crack the code on the ECU that my 2001 Sentra SE has. I was wondering if anyone has successfully programmed a B15 ECU yet, or if they have any knowledge on how I should go about it. I know that as far as I have read, there is not a ECU upgrade currently sold for the B15. I have a home turbo install project going on and if I can't crack this ECU, what are my options? I do not wanna pay a couple grand for a stand alone unit either. I want to stick with Nissan ECU's:D .

One word:

Greddy EManage

Riiiight. ok, well, how much does that usually run and what is the interface like.

Go to B15Sentra.net and PM Travis4011. He is about to use the Emanage on a B15 for turbo.

Has anyone done it? No. JWT promises to, but they're busy people. Probably easier and quicker to just get an old-style engine with it's harness and ECU. ;) SOKO and K.Watanabe have been known to sell JDM SR20DE high-port engines for $250-ish, and they're a better point to start from than the B15's roller engine anyway.

Ah, but I enjoy the fact that I only have 18000 miles on my SR20. Besides, I have been realizing lateley that small modifications to my intake and timing really make a large difference. I dont really wanna do an engine swap to run a T25 turbo just because of an ecu problem. I will hopefully be able to solve the problen in a much more efficient manor. thanx man. I will save the engine swap for a T3/T04E in the future.

...but if you pull it now, it'll always have 18k miles! ;) Also interesting to note; SR20s seem to get faster with age. Weird, huh?

Im intrested to know what you do please post it as I am just about at the same point. Does JimWolf make something? I thought they did.

Well I have since found 2 options. One, I could buy a Greddy Emanage from Travis on b15sentra.net for $575, and that would come programmed and ready install. This system would be best as it offers PC compatibilty so that it can be tuned to perfection in any future upgrades (I.E. larger turbo, more boost, cams, fun stuff). I would recommend this as it is better in the long run, for you and your motor. Trav4011 is his user name, NOT travis4011. He wont screw you over, and he has done this stuff before. Now my second option is what my IC Engines professor told me about today. I could install a cheap MAP sensor device in line with the ECU (like what the Emanage does) that has the processing that will make the ECU read 0-10psi (or whatever you are boosting to) instead 0-atmosphere as the ECU usually reads. In turn your ECU would make it's own adjustments accordingly after learning of this new reading. Of course at this point you will have installed the 370cc or higher injectors and possibly a new pump depending on your level of boost and fuel needs. And BAM you have a cheap setup. Supposedly even GM makes these inline devices but I haven't looked yet. Like I said, I learned of this today and I had to take it all in within the 5 minute conversation we had. As far as breaking that 32bit encrypted code in the B15, JWT hasn't done it yet and I dont think anyone in my mechanical engineering department knows how. So I hope this helps you out somewhat. Maybe if someone knows more about the MAP device they could share their knowledge and maybe someone even knows how to find one.

Using a MAP device is cool, but it doesn't solve all of the problems. Some B15s actually already have a MAP sensor outside the TB in the intake tract, though I'm quite sure that it was never intended for use under pressure.

Having a fuel enrichment circuit that works based on positive manifold pressure is a good start; Vortech, Arospeed, B&M, and others make such devices (often called RRFPRs, or Rising Rate Fuel Pressure Regulators) that simply push up the fuel rail pressure as boost increases. Ford and Honda guys do this all the time, but also blow up a lot of motors. Clearly using a MAP-sensor-based system that widens the pulse width of the injectors is a much better idea, but takes tuning.

Travis goes by "unlucky" on this board, but I'm pretty sure that he hasn't actually configured an eManage system for a B15 yet. Not that he can't or won't, but hasn't. Wanna' hear something cool? The roller engine's fuel rail actually accepts MSD 50-lb/hr injectors with a little minor modifications. ;)

hmmm.....I could talk to my fellow engineering students at cornell, hell we have nothing better to do.....YET...:eek:

Please do tell how you can fit the MSD injectors in the top mount fuel rail. I am interested, very! I did recently talk to travis and he seemed confident about the Emanage system. I met some Honda guys last night that are using them and they said the system is very easy to use. I am going to talk to my professor more about the MAP sensor and yes, the B15 does have them. it is in front of the battery in the factory intake plastic tubing. The reason I cant just use that is because it wasn't made to handle pressure. So that is why, in order to use it, you must make it read other than the factory 0 - atm. I just wanted to know if someone knew how to do that. This should allow the computer to remap and it will take into consideration spark and fuel. And I did find out GM's new ECU's are not easy to crack like everyone thinks. Some guys in my dept. were talking about them possibly being 32bit encrypted now. OH well, our school now uses a custom stand alone for the future truck.

You use washers or machined spacers to stand the rail off of the manifold. The seat on the rail is just what the MSD injectors need, but the 50-lb'ers are taller than the stock injectors.

thanx. very informative. had the injector problem in the highest priority.