i was looking up some ecu's at jwt. i found two versions for my vg30e. one said "FED" and one said "CAL" the description for both ecu are exactly the same...

my question is: what is the difference between those two?

 

Fed spec and Cali spec...
Different emissions stuff, is about it.

 

which one should i get? sorry i'm a noob

 

Well, is your car Fed spec or Cali...?

 

If you live in Cali and your car is cali spec on the emissions.......

(do some searching around- there's lots of threads on how to tell which your car is).

 

okay... now when i purchase it... what do they give you? like the product... do they give you a chip and you install or do they send you the whole thing to plug into the harness>

 

depends on what you want to do. generally you send them your eCU and they modify it, fitting it with a daughterboard and new ECU.. then they ship it back to you.

OR you pay them a whole lot more money and they use an ECU they have sitting on a shelf.

or you could watch the classifieds here and ebay and you'll see one come up every few months for much cheaper than new.

 

can you use a fed spec ecu on a cal spec maxima?

 

"this vehicle conforms with the US EPA and the state of califonia" is that FED spec or CAL spec?

 

Ummm..cal spec

 

How much are these new? $500? The more I think about it, the more I think one could do the same via twisting the dist and using a SAFC. Or an EU that you hardwire in.

 

you would need the EU in order to change many of the things the JWT fiddles with.

it adjusts timing and fuel curves, based on throttle position and engine rpm and etc.

it's more than just advancing the timing and adding more fuel.

 

The more I think about it, the more I think JWT doesn't fiddle with nearly as much as we would like. IMHO

 

Yup. JWT really didn't do a whole helluvalot with our ECU.

increase timing, bump WOT fuel to 12.5:1 based on MAF voltage.. leave cruising A/F at 14:1.. raise rev limiter a few hundred RPM.