SR20DEN

iTrader: (7)

Correct.

Now who wants to take a stab at why you would want to use Nissan software, ingeneral, as opposed to TS or JWT software? This one has been answered already. I just want to make sure everyone is following along.

JeffesonM

iTrader: (5)

...because they made the engine?

Pimpmobile

iTrader: (1)

because factory settings are optimal for the VQ?.....

JClaw

iTrader: (17)

Going with pimp on this one.

nismology

iTrader: (8)

There are advantages to aftermarket tuning so i dunno where this is going...

JSutter

iTrader: (46)

stock ecu, maybe with a raised rev limit. then dyno (unless you have a wideband setup) to check the air fuel. then use a air fuel controller if need be. aftermarket ecu's are tuned to one car, then mass produced, thus not releasing the full potential of your car with your mods. why spend money on something that wont live it its fullest.

nismology

iTrader: (8)

A/F tuning isn't all that counts. Ignition timing advance has its place as well.

JClaw

iTrader: (17)

Ignition Timing Advance is THE reason to get tuning done on 4th gens with VQ35's.

NmexMAX

iTrader: (22)

.

JClaw

iTrader: (17)

The OBDI conversion is waiting on future paychecks, there's always something else to burn cash on. I need to stop

SR20DEN

iTrader: (7)

This is true. The stock software that was written for the VQ35 is the best "one size fits all" scenario. If you don't have the luxury of having custom software written specifically for you car WITH your car, you're most likely wasting your money. The rest should be done with the tools you have in YOUR posession. And in most cases this is a piggyback fuel computer.


So we've established which software is, and why it is, the all around best.

We also know that we still have to send off the ECU to get the rev limiter raised.
And with the paramters that we're dealing with here we also know that it isn't feasible to swap out the entire wiring harness to use a 2k2 ECU. We're going to use a ECU which is native to the vehicle, most likely a '96.


Anyone want to fill in the blanks here?

Keep in mind, software and hardware (ECU) are NOT the same thing.

nismology

iTrader: (8)

4th gen ECU w/ raised rev-limiter + SMT-7 > *

JClaw

iTrader: (17)

It will cost me 500$cnd (about 400US for you guys) so it's cheaper than JWT. The 700$ was a girlfriend-related spending spree (partly my fault and I take the blame for it).

Tuning: 400$cnd (300-320$US)
OBDII->OBDI harness adaptor: 150$cnd (115-120$US)

Both together: 500$cnd (400$US)

We're probably going to use the cam sensor holes (one on each cam) that the VQ35 uses. Both of those sensors are in my car and useless for now (just to seal the holes) but they will probably be replaced by the sensors compatible with the 300zx ecu. He's going to take one out of his RB26 and see if the size of the hole is right, since it is directly in front of the cam. This COULD mean that future VQ35 swapers could do it without going through the whole timing chain ordeal or going through all the 2k2 wiring BS.

SR20DEN

iTrader: (7)

You essentually repeated exactly what I said. You did not fill in the blanks.

Kevlo911

iTrader: (36)

Funny how everyone just assumes we will figure out the cam signal and get the SMT7 to work.

SR20DEN

iTrader: (7)

Who said it hasn't been figured out?

Kevlo911

iTrader: (36)

Who says Perfrect Power has it to update the firmware?

SR20DEN

iTrader: (7)

Who said it had anything to do specifically with perfect power?

You're talking about something else anways so I withdraw on this one.

Kevlo911

iTrader: (36)

Ahh!

So you know the cam signal and how it relates to the crank signal??

SR20DEN

iTrader: (7)

Not entirely. But as I was saying, that is a different subjuect and not relavent to the current conversation.

Pimpmobile

iTrader: (1)

A VQ30DE ECU with a VQ35DE flash?
Im on a roll so far

I30tMikeD

iTrader: (8)

You don't flash a VQ30 ECU, you need a daughter board and a burned chip.

Pimpmobile

iTrader: (1)

VQ30DE ECU with a VQ35DE somthing or other?

no more socratic method

SR20DEN

iTrader: (7)

Bingo .

JClaw

iTrader: (17)

How would we be able to advance the timing to what 2k2's with timing advance run? The stock Ecu limits that after a certain point.

DandyMax

iTrader: (7)

And just who is able to do this?

JeffesonM

iTrader: (5)

can TS put the 2k2 maps onto a 96 ECU?

SR20DEN

iTrader: (7)

A map is a map. It's nothing but a set of hexidecimal characters.


I didn't say put Windows XP on a Macintosh. But I am saying make the Mac OS look like Windows XP.

nismology

iTrader: (8)

All they would have to do is copy and paste those a/f and timing maps onto a daughterboard!!! Brilliant!!! Damn...good thinking SR20. This is sooo much easier on them than making a modified map. I'm sure they could have a 3.5-spec ECU in production in no time.

SR20DEN

iTrader: (7)

It isn't a new idea. I just never got the opportunity to use it so I am essentually giving it away.

There is more to the story that I can't give away becuase the rest of it is co-owned by someone else.

j_bryan

iTrader: (1)

clever....reminiscent of daniel b martin.

SR20DEN

iTrader: (7)

Just don't forget that it needs to be the L-Spec map.

Anyone experiementing with intake manifolds could get away with a 350Z map. Which I almost did on my car when I got my L-Spec. I just didn't want to spend the extra $200 at the time. But later this year I'll probably go through with it. The cam timing curves on the FWD cars are not what they should be. I even got Tadashi to verify this when I spoke to him last Janurary.

krismax

iTrader: (15)

This sounds very good but i have no VTC what about me would this still hold true for me and the others with 3.5's with 3.0 ecu's with no VTC????

SR20DEN

iTrader: (7)

I don't know if the VTC is software co-dependant of the tune of the car. But I am certain it is co-dependant of the VE (volumetric efficiency). Therefore the 2k2 3D map will have plenty of answers for all available cam settings at each RPM. And any software dependancies should be irrelivant. Especially since the '96 ECU won't even have settings for the VTC.


But everyone take note that I never said you had to toss the VTC. It will however be ALOT of extra work to keep it though.

Pimpmobile

iTrader: (1)

SR you are a true asset to the maxima comunity!

Would a company such as TS be able to transfer the fuel maps and timing maps from a VQ35 to a VQ30 ECU? Would it provide better gains with the 350z or g35 maps than the FWD maps for a non VTC VQ35?
Also what would be the starting point to get VTC on a VQ30DE ECU driven VQ35, multiple RPM switches, somthing similar??

98SEBlackMax

iTrader: (9)

Without Variable Timing Control volume metric efficency is reduced on the low~mid range. If Techno Square programs a stock 2k2 timing and fuel map onto a 4th gen ECU as proposed the result would be less than perfect timing on the low ~ mid range. This occurs because Nissan programs ECUs to pull back timing when the VE is high. I also observed this when I was tinkering with the SMT-6 and timing advance. Adding timing where VE is highest can result in easier detonation and doesn't seem to gain that much power. However with the SMT-6/7 piggyback it can add timing down low to make a little more power for the 2k2 ECU tune and missing VTCs.

98SEBlackMax

iTrader: (9)

No.

I have a plan in the works but don't want to say, not because I like to keep secrets but I would rather have it working and post dyno results.

End users will be able to tweak and program the VTC functions and this should also allow us to use the NISMO VTC assemblies for even more advance. This should in theory allow us to run more radical aftermarket VQ35 cams and still be streetable.