ECU MOD for a y33

[PMF]

Hey- has anyone found an ECU mod for the y33? I know Jet Chips can do something, but I am not sure how much i trust them.

[Q45tech]

ODB2 ecu don't have a SINGLE chip per se that controls parameters for WOT performance.

The actually have microcode integrated into the the actual cpu........encoded flash memory across multiple chips.

Designed to be tough on aftermarket and harder for competitors to read and steal.

[elwesso]

robert looked into it, nad there is no way to reprogram the one time programmable microprocessor. Even if there was a way, theres no way to get the program off the chip nad theres also no knowledge on how to reprogram it.

Youd be better off using a piggy back ECU to change timing and stuff.

[PMF]

Has anyone here done that- or can suggest a reputable piggy back? I am not too familiar with this particular modification, and I am sure if it is done wrong it can have many consequences down the road.

[cullenj76]

Has anyone here done that- or can suggest a reputable piggy back? I am not too familiar with this particular modification, and I am sure if it is done wrong it can have many consequences down the road.

No offense, but if you need suggestions on a reputable piggy back or stand-alone, you probably don't need to be digging that deep into your vehicle. Do you know how they work? You'll be required to invest even further in a wideband and a decent amount of dyno time.

[PMF]

To be honest- I really don't NEED it. I would like to have it done. I have heard different things about what the results can be. I was hoping that there was just a ready made thing i can plug in. But since there is not- I would like to learn more about it and increase my knowledge if nothing else.

from what I know/have heard its a flash memoroy that is added onto the ecu, which alters timing, and fuel/air ratios and what not...

Like I said- not an expert and really don't NEED it.

[Falkdesigns]

Not that I feel I need it either, but cars are getting crazy power these days, 400 is almost commonplace and a little more power is never a bad thing.

[Q45tech]

Based on the spread between the 4.5 liter and the 4.1 liter you will see that the 4.1 creates more % power per unit of displacement so the upside is smaller on OBD2 software. While a 4.5 early Q might gain 20-25 HP from a new chip, the 4.1 might only gain half that from a reprogram.

Look at the miniscule gain they accomplish with the new G35 [ecu reflash] to see how much of the safety Nissan has already used up in HP race.

In theory there is still 10% safety built into software that can be discarded by getting closer to ragged edge. Unfortunately US gasoline is now at such low quality that this 10% cannot be utilized.

An inexpensive method is to acquire a used MAF modifier [it intercepts the MAF signal and trims it leaner by negative 1,2,3,4,5% at specific rpms which should increase HP by the same amount above 5,000 rpm .

Google and Ebay "SAFC"

[elwesso]

Based on the spread between the 4.5 liter and the 4.1 liter you will see that the 4.1 creates more % power per unit of displacement so the upside is smaller on OBD2 software. While a 4.5 early Q might gain 20-25 HP from a new chip, the 4.1 might only gain half that from a reprogram.

Look at the miniscule gain they accomplish with the new G35 [ecu reflash] to see how much of the safety Nissan has already used up in HP race.

In theory there is still 10% safety built into software that can be discarded by getting closer to ragged edge. Unfortunately US gasoline is now at such low quality that this 10% cannot be utilized.

An inexpensive method is to acquire a used MAF modifier [it intercepts the MAF signal and trims it leaner by negative 1,2,3,4,5% at specific rpms which should increase HP by the same amount above 5,000 rpm .

Google and Ebay "SAFC"

i Was going to say something along those lines... OBDII is more advanced and thus technically doesnt have as much safety factor built in. I think its because the chips are faster and can react quicker to things like detonation and such.

[maxnix]

i Was going to say something along those lines... OBDII is more advanced and thus technically doesnt have as much safety factor built in. I think its because the chips are faster and can react quicker to things like detonation and such.

Partly, but also there are more sensors, including the "tree-hugger" secondary O2 sensors.

[Q45tech]

Only early Q the injectors were open around 10.5 msecs [above 11msec torque peak rpm], so a 5% decrease in open time should enlean the AF by 5%, anyway whatever you do don't go below 9.5 msecs [11.2% leaner].

Remember the injector takes 1.5 msec to reach 66% of rated flow so you subtract 1.5 from each Msec time then take ratio to get %: 10.5-1.5= 9.0 then 9.5 -1.5 = 8.0 so 8/9= 11.2%

OBD2 unfortunately will react to a lower air flow [fooling ecu MAF voltage]with changes in ignition advance........this may help or hurt.

A dyno test with zero MAF correction vs - 5 and - 11.2% will tell you what you need to know.

You can destroy an engine and cats quickly by running too lean in extended WOT operation..............like with a run lasting more than just 16 secs [quarter mile] but few try to reach top speed in 60 second runs.

The factory knows some people [and magazines] will try to test top speeds and thus adds significant safety to protect in 100F ambient runs. Plus they must warranty cat life for a long time.

Lots of difference in time for a dyno run and the real highway which takes 3 -4 -5 times longer to reach same speed so always save [be conservative] when dyno tuning.