I filled up my gas tank the day I recieved my JWT ECU (last Wednesday). And you know, I've been driving my car a little hard lately, taking it to 7000rpm on occasion, winding it to 6000 often, etc. Needless to say, I've been flogging my car a lot more than usual. I filled up my tank today and calculated my fuel mileage. It came out to be a whopping 24.2mpg!!!! Before the ECU, I was only getting 21-22mpg with much less flogging and the same driving cycle (about 80% city). The temps really haven't changed much and the I use the same gas station. I'd imagine my MPG will go up even higher now that I won't be driving as hard.

Any other JWT ECU owners note this?


Dave

 

If thats the case........where do I get me a JWT ecu?????

 

Good luck finding one for your 99. If you do, let us ALL know.

 

I've heard the JWT will work on a 97.

This true?

 

damnit I forgot........at least my hopes didnt get too high

 

You can run a 96 ECU in the 97 and apparantly the same goes for the 98 seeing that Mardigras is running a 96 G-Force ECU in his 98 and Neal was running a stock 98 auto ECU in his 96 5 speed before he got his JWT ECU (96 vintage).


Dave

 

Well, looking on car-part.com, 1997 ECU's are labeled "10/96, 11/96, 12/96" for dates, and 96 ECU's are labeled "10/95"

So which is a 96 ECU, which is a 95, which is a 97??

 

The 95 ECUs mostly have XX/94 labels seeing that the 95 was available in September of 94. The ECU I got was a "from 11/95" ECU due to the late build of my 96 SE (March of 96). You need to find out when your car was built (look in the drivers side door jam) and from there you can determine which version you need. BTW, it will be a XX/96 model.


Dave

 

nope - 03/97

 

So explain to me why someone couldnt find a ECU from another 99, like in a wreck....take it out and if it works still send it in to JWT and have the reprogram it?? WHy wouldnt that work???

 

So that means you need the "from 12/96" ecu. Now that wasn't terribly hard


Dave

 

Pretty much you're screwed since you own a 99. The 99 ECUs share more in common with the 5th gen ECUs. I think the wiring harnesses from the 95-98s are the same and that's why people are able to 96 ECUs in 97/98s and vice versa. The 99s on the otherhand have a completely different harness. Also, JWT has only been able to crack the code on the later 95 and all 96 ECUs. You HAVE to send them an ECU from that vintage if you want it programmed.


Dave

 

Ah I see I see.

So theoretically if one could find a 99 ecu and send it in to them they could start working on cracking the code and then being able to do the 99's????

Well, someone with cash start it up.....my suspension just killed me

 

they do not care about the 99's

 

Noone does Jeff!!

 

Maybe because the JWT ECU leans out the fuel a bit? I'm guessing Nissan programs the stock ECU to be rich to protect the engine.

 

Actually, the 12/96 ECU isn't programmable.

Wouldn't work for the JWT applicaiton - I called JWT this morning - I need 11/95 at the latest, but will have to live with a CEL.

 

Crap, now I have to look at the date of the 96 ECU I have in my closet. BAH!!

 

Yep - the ones dated after 10/96 are for 1997 Maximas.

 

No Love for Fuchsia 1999 sedans

 

I don't know sounds like a good excuse to get one though and I have a 96

When does the rev limiter kick in on the stock ECU? I was taking my car to 7,000 rpm last weekend against a 2k2, is their anyway to tell the difference between a reprogramed ECU and a stock one?

 

The stock limiter is 6500rpm, but due to the fact that our tachs are off 200-300rpm it appears as though it is almost 6800rpm. JWT puts a little white sticker on their ECU's it reads - "Jim Wolf Technology P.O.P. Upgrade, 96 MT Fed Spec, Only for use in California. Not legal on highway, only for off-road use" ...or something very close to that. if you have a 95 or AT naturally it would state that instead of 96 MT.

--Paul

 

Where does it say the date on the ECU?

 

It doesn't. You have to go by your car's build date.


Dave

 

Well, the ECU I got is supposed to be off a 96 maxima. So I guess I'll be okay. =) Thanks for the info. I went nuts for about 5 minutes searching for the info on the ECU.

 

I already have the ECU pinouts for both '97 and '98/99. Anybody have a '98/99 box they can take a picture of inside? I need a good shot of the board especially the chip label.

 

I have a 98 ECU I can take pics of the inside.

 

So does that 98 ECU work in your 96?

 

Yes it works fine.