After someone gets a full VQ35 swap (I'm talking block, heads, IM whether its 2k2 IM or '00 VI) and maintains stock VQ30 ECU, with VQ30 Timing equipment what if any tuning is required? How would the AFR's be? Tilley recommended keeping the stock vq30 ECU stock, simply because it has the optimal settings for the VQ35. So far from what I understand a VQ30 ECU on a full VQ35 swap (minus VTC, wiring, and ECU) simply detects more air because of larger displacement. However, I see many individuals here who have swapped motors or have had others swap mention that they need to tune and what not.

So what exactly needs to be tuned and is it required. Will one run lean or rich with '00VI or with a 2k2 IM. The only reason I would consider getting a TS or JWT ECU would be to take advantage of a higher rev. limiter. This is solely based on Tilleys recommendations. So guys what's the scoop with tuning, fill me in!

 

No one with the swap has really dyneod. So A/F cannot be determined just yet. Tilley has, but I don't remember seeing the A/F, it exsists, but I haven't haven't looked in too great of detail for it, but you donate so search on. But I would also like to see vlasy, JClaw, maybe even dubbya dyno ... with the latter 2 running on 4th gen ECU's.

 

Dubbya dynoed... 180WHP and I believe 200WTQ

 

Yes he did, but he didnt get an AF grpah. His has to be WAY off

 

Way way off.. but I wonder what he would've done SAE since it was a mild day and overall non-ideal conditions.

 

SAE results that night were worse, I lost a bit of power with SAE correction. They were giving people graphs in STD to keep everyone happy I think.

 

Anyone else?

 

Twas a wideband homie. Check the dyno sheet again.

 

Another thing to keep in mind is that my engine was pretty heat soaked. It took me 45 minutes or so to get to the dyno on a hot day and my car only set for like 10 minutes before the dyno. Lots of factors involved here.

 

The engine bay? The whole garage was heat soaked. SR's numbers were lower than normal too.

 

Here's Dubbya's afr compared to mine back when I was NA. Pretty similar.

 

They said it was about 100 degrees inside.


Woops, you do have A/F

 

The important part of the tuning is ignition timing advance. VQ35's can run far more advance, so to get the most out of our VQ35s, we need to advance timing A LOT.

 

How much is a lot? What the stock 4th gen ECU timing, JWT timing, and Stock VQ35 timing?

 

Numbers would be nice ...

 

You're paranoid

I am not ready to dyno yet. I just spent 700$ this week and I'd need an extra 500$ to get the 300zx conversion completed, we're working on the crank sensor issue.

I will get better track numbers this weekend though.

 

No not but you always specify A LOT, but no #'s .And I'm not interested in what is going to hurt my car if that's what you're implying because I don;t have a 3.5 hybrid setup(running on 3.0 ECU), but merely, I'm interested as to how much more gains are possible with these 3.5 hybrids.

.. I can drink A LOT of whiskey, but A LOT in your and my words can differ.. Also as stated in previous posts by the well respected and reputable BlackBIRDVQ, that with too much advancement no gains but rather a loss is experienced...

I think I know where you're getting this "A LOT" more is safer with the 3.5L concept from. But for confirmation ... where?

 

Thought it was supposed to only cost you $500 for the 300ZX ECU setup?

 

Too much timing = knocking = timing pulled back = power loss. I expierenced this on the dyno at Maxus.

 

Theres a theoretical limit to how far you can advance spark on any given engine. Even with race gas theres a finite limit, to best of my knowledge no one has mentioned where it stops gaining on a VQ30/35. However with the VQ35s they can attain more advance on lower (IE 93~95) octane because of better heads but even with race gas they are ultimately limited as well.

Edit: I would also like to add that if you use an octane that is to high, you will lose power. With advanced timing its critical to match your fuel octane to the amount of advance your are using.

 

Well, I know 89 is bad with a TS ECU but what would be bad on the high end of the octane scale?

 

100+ octane, basically if you run race gas in a car that doesnt need it or thats not tuned for it you can lose power.

 

If I had a VQ35 using a VQ30 ECU I would go with something like an SMT-6 or some other piggy back or stand alone that would allow me to tune the AF and timing myself. I would not trust that a TS or JWT would be right for that type of set up.

 

Come on guys. There are alot of smart people in here, can't you figure this one out?

 

figure what out?

13.5~14.0 A/F at WOT for 1/4 mile use and 12.5~13.0 A/F at WOT for road course use. With the SMT-7 I should be able to tune wideband so those values will be consistant and not be a static map.

Timing advance is variable. It depends on the engine, fuel octane, A/F ratio, and atmosphere conditions for the most part.

 

The best solution for controlling a VQ35 without a VQ35 ECU.

 

Its hard to decide on whats the "best" soultion. It depends on how much people want to spend. If money isnt an issue they can get a Motec M600. But no OBD-2 or emissons controls, would be difficult to pass some emissons testing.

If JWT or TS developed a good all around program for a VQ35 swap in a 4th gen that would probally be the cheapest option. But IMO this wouldnt work for everyone, one size does not fit all...

OBD-1 300ZX ECU swap if Jclaw can figure it out, but that rules out some states emissons testing because of lack of OBD-2. Pricing is to be determined...

Me im biased because of the SMT, so I would use an aftermarket ECU with just a rev limit increase and control the timing & air/fuel with the SMT-7. It's not the cheapest option but i would have control over a good part of the engine while retaining my OBD-2 emissons control systems. The main reason I bought a '96 was OBD-2 testing. All they do now in Mass is scan the computer for codes and pass you. Ive used resistors and other tricks to fool the ECU and have passed several times.

 

You almost had it.

Think about it people, who makes the best VQ35 software?

 

Anyone??????????????????

 

Hondata?



Really though, I'm guessing you mean a manufacturer that focuses on the 350z/G35/Skyline, Yes?

 

Impul? Just a guess. That's what many of the top vq35's in Japan run on.

 

I didn't say aftermarket.

This one is blantantly obvious.

 

I'm waiting on some smart-a$$ answer like "Use the VQ35 ECU...duh!!!" or something...

 

You're half right.
Keep going. And if you had read what I actually said you woudl know I have already established that isn't the case.

 

Well i know you said not the VQ35 ECU. But you also said it's not aftermarket. How can something not be either stock or aftermarket??

 

I didn't say it wasnt stock. I said not aftermarket. And again the question is "Who makes the best SOFTWARE for the VQ35"?

There is a point and a reason behind all this.

I don't want to just give the answer away. I want everyone to understand what the answer is and WHY the answer is what it is.

 

nissan....

 

...Because they designed the engine...

 

350z ECU?
12345

 

Consult????