I know I can rely on you N/a guys to guide me through my next step, injector/fuel pump upgrades. I had a deal on injectors/fuel rails off a 350Z for 250 Can$. I was wondering if as step up from 259cc/min to 330cc/min would get me a ''fine'' upgrade considering I would tune this setup with a V-afc2. I,m not planning in the next year to invest on a ''better-suited'' ECU or piggyback to get the most out of it. I have nearly every bolt-on available for a 4th gen VQ30 including a 00VI swap.

For the pump, my choice is made on a walbro 190lph or 255lph
By the way, huge thumbs up to DANDYMAX and JIME. In Quebec , me and my buddy 97_roadrunner think they are the ones to look up to in N/A VQ30 config!!!

Looking forward to get your advices.

 

I would focus elsewhere if I were you. Until your fuel injectors are running out of steam, don't worry about it. You should be good up into the 230+fwhp.

Also, keep this in mind : http://forums.maxima.org/showpost.ph...4&postcount=35
Cliffs, Z33's run @ 3.5 bar and your car runs @ 3.0 bar, so comparing their flow rates is apples to oranges, and DEK injectors flow the same as Z33 injectors at the same fuel pressure.

 

Thanks for the advice, but it seems that my current injectors are at 203.000km or 120.000miles. 13l for 100km on super normal driving seems to be a lot...

If I understood, I should get a FPR or a higher-debit pump to get my pressure at 3.5bar and dyno runs to fine-tune it.

 

What is your reasoning for this? Timing advance?

If you want real security, use a DEK fuel rail and call it good, as I doubt you're going to max that out NA.

 

Before we start talking injectors, what are your plans?

 

I plan to stay N/A. I thought about getting more fuel in, I had a better power producing formula. Replacing my old fuel injector/fuel rails assembly, I would get the appropriate amount of fuel to go along with the VI swap. Im a bit intimidated with the whole EU processus. I'm looking to get rid of my mid14timeslips... Maybe that ''rare-to-come-by'' JWT ECU with 7200rpm limit is what i'm looking for, according to what I read on the site.

I want to get faster but want to keep the stock camshafts because of all the job. I have the stock a33b VQ35 cams, but read It doesn't worth the change vs. the power upgrade. guide me if I'm wrong. thanks.

 

I don't really see the need for larger injectors, to be honest. The A32 MAF/injector combo is good for ~350CHP. You'd have to upgrade the fuel pump before reaching that power level.

 

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Dandymax's running nearly twice the injector size and running mid12's...
I recon he has A LOT more that me but two seconds off my time isn't only traction related. He also have a EU. Is the stock ECU is THE bottleneck in my setup!
I looking to run mid 13 with street tires and call it a day.

VI swap, V-afc2, stock injectors, 6 puck non-locking diff, 225/45R17 S-03's
injen CAI, y-pipe + full 2.5 mandrel exhaust, magnaflow cat, short shifter
UDP crank pulley, no a/c, what else... 1995 SE leather about to be stripped
(only keeping the driver seat) near 1400kg.

 

Thank god my posts are invisible!

 

maybe my answers are in your 7344 posts but it would be a lot more time-consumming than asking you properly how to make more power with my car.

 

Not according to this post.
http://forums.maxima.org/showpost.ph...7&postcount=51 <--220fwhp dyno data logs

I doubt he's running over 500cc's (nearly 2x as you stated, depending on which injector you are referring to, DE or DEK, either way, it's over 500cc @ 3 bar)

 

I was referring to post #7 in this thread.


But if you're serious about making the most power that your engine is capable of, you'll get the EU at the very least. It's the best option for 3.0's.

 

Just thought about it....

If you did the 00VI using the A32 LIM and fuel rail you can't use 350Z injectors.
If you did the 00VI using the DE-K LIM and fuel rail you already have 290cc injectors.





With that said, I'd get something like this and dial the fuel back using the V-AFCII (since you don't want to upgrade the engine management).


And as for upgrading the fuel pump... http://forums.maxima.org/showpost.ph...93&postcount=1

 

I have DEK injectors (have ever since the 00VI swap), and I would agree that if you're staying N/A with the 3.0, they are sufficient. As nismology says, you can always upgrade to a Walbro and run an AFPR (which I'm currently doing btw), with the benefit being some crude timing advance (assuming VAFC vs EU).

 

Sorry guys, I mistook as I read somewhere else Dandymax was running bigger injectors. I was thinking I was about to max my stock injectors and you guys are running big time on those stockers. To answer Nismology, I kept the A32 LIM. Is there a compatibility between the two injectors\fuel rails assemblies.
I know one is using side feeds and the other top feeds. It answered me on the bottleneck question. The stock Ecu is the culprit. Thanks and I'm going to read a lot more on EU to get all this figured out.

 

side feeds and top feeds are not shaped the same, you can't use one in place of the other without changing LIMs and fuel rails.

+ on upgraded injectors being unnecessary.

 

The EU really is your best bet (without paying a fortune) for an A32 ECU, or I suppose the next best option is a UTEC for double the price... (has anyone installed one on an A32 ECU yet though??? - not that I know of).

If you're worried about the complexity of an EU I might be able to come up and install & rough street tune one for you (since you're in PQ, but when, I'm not sure as it will be a busy season for me). And of course you understand I'd need to charge you for the install plus the gas money to make the trip there and back. It would hands down be better than a VAFC though.

You have a 5-spd MT I gather?

 

If you upgrade to the 3.5 injectors we found that when we set it up for a recirculating fuel system that the bank at the end of the line would starve for fuel and run lean and we had to put in a larger bridge between the rails to solve the problem.

 

VQ'ed and me, we are spending our weekends, to do all our stuff together.
We should'nt have any problem to install the EU. The A32 ecu wiring is not a worry for me anymore. We are more worried about making the car run great, even for a daily.

 

Thanks for the info, however he wouldn't be going to 3.5 injectors, the DEK/4th gen fuel rails are not an issue for his setup.


Ok well good luck then, it was just an offer, I just assumed it was the install he was worried about. With the mods on the car (just bolt-ons) you shouldn't have any issues getting it running great, but if you need my help feel free to PM/email.

 

Thanks again for your proposal. It's a great offer.
Yes, he have the bolt-ons + 00vi swap(just the upper manifold, not the de-k fuel rail) and the 5spd swap. If VQ'ed cross the EU road one day, we will be looking forward for some help from great guys on the .org....