Hey Guys,

I've been trying to follow the thread regarding the VQ30DE injectors vs. the VQ35DE and am still not quite sure about the outcome...

So:

1) Does the 2000 SE Maxima have the 370cc injectors, or the smaller ones?
2) I've got 440cc injectors (from a skyline maybe?) that I was thinking of using when I install my supercharger... from the thread it looks like even with the S/C, I'm still going to have to get a piggyback ecu or send mine to JWT, right?
3) Are the stock injectors going to supply enough fuel with the S/C and the stock ~8lbs of boost?
4) How much boost could I safely go with the stock injectors and not worry about blowing up the engine?
5) A little off topic... I've got an UD crank pulley... Has anyone run a S/C with an underdrive crank pulley, and maybe a smaller blower pulley? I'm thinking that a smaller (by a little bit) blower pulley (higher boost) may offset the UDP..? Any ideas/opinions/experiences?

thanks!

 

295cc(still not 100% confirmed!)

JWT does NOT make an ECU for 5th gens.. Greddy eManage is looking promising, which is a piggy-back.

Yes, for awhile at least with a FMU to raise fuel pressure.

You can blow it up at ANY psi probably, it all depends on proper tuning. As long as you follow in others footsteps, you can easily run 6-8psi non-intercooled.

Check out Vortechs' website calculator.

 

it will lower your peak boost if you have smaller crack pulley.

 

 

295cc(still not 100% confirmed!)
Didn't you say at the top of this thread http://forums.maxima.org/showthread....fuel+injectors that they use the 390cc one's? confused (again)

JWT does NOT make an ECU for 5th gens.. Greddy eManage is looking promising, which is a piggy-back.
I know they don't make one, but they can still remap the ECU to my setup, right?

Yes, for awhile at least with a FMU to raise fuel pressure.
Thank God!

You can blow it up at ANY psi probably, it all depends on proper tuning. As long as you follow in others footsteps, you can easily run 6-8psi non-intercooled.
Any particular footsteps that you know that I should follow?

Check out Vortechs' website calculator.
Will this give options on the cranks and all?

 

someone likes crack more than crank....

 

I said VQ30DEs were running 370cc Z32, aka 300Z TT injectors. We have a VQ30DE-K, ie 5th gen with top feed injectors. VQ30DE, ie 4th gens. have side feed injectors and thus can use 300Z TT injectors.

No...JWT doesn't offer ANYTHING for us. TechnoSquare *MIGHT* in the future. I'm working with them now on an ECU.

I'm not the expert. Just stick with the fuel setup these guys recommend for what particular pulley size you're running. Add an Apexi S-AFC and get it on a dyno for fine tuning. It's all about proper tuning.

You enter in the pulley sizes and you'll see what the resulting SC rpm will be. That will tell you what pulley combination will net you the desired psi.

 

great, thanks for the info...

looks like i've got some injectors to sell...

 

1234567890

 

the guy that i bought my kit from was using a 2.5" pulley AND a udp to get the desired psi, i forget what he was running though.

 

2.5 SC pulley? I thought the smallest pulley available for V2 is the 2.62. a customized pulley maybe? but with a 2.5 pulley, you have to shave a lot off your mounting plate.


if you have a samller crank pulley instead of stock size, your impeller rpm will drop and your peak boost will be lowered. it would be best to have a lighten crank pulley in stock size. someone (was it you, Ice? or maybe it was Confused) contacted UR and UR said that they could make something like this.

 

here you go, guys impeller speed vs crank pulley size calculation.....in case you couldnt find it.


http://www.vortechsuperchargers.com/...pspeedv-2.html

 

UR makes a lightweight OEM size pulley for the SC or guys that don't want to underdrive due to stereos, A/C, etc..

BTW, an UDP doesn't just limit PEAK boost, it lowers the boost at ALL RPM.

 

you're right....

if you play around the rpm at shift....you will see the impeller rpm drops for all rpm range. However, the impeller rpm drop is more significant at higher engine rpm, which makes the boost drop more noticible.

 

I'm thinking about the apexi afc.... this would allow me to use the 440cc injectors, right?

 

The Apexi S-AFC allows you to change the amount of fuel the car is getting at a specific rpm point -/+ 25%. This allows only stock fuel pressure changing I believe, and not the actual FMU amount changed. Using this will allow the car to function ok during WOT w/440cc injectors I believe, however at Idle and regular cruising, you'll be **** out of luck.

Go with the eManage. It has got its own injector harness and allows you to increase the size of the injectors by just punching in a few numbers. sx7r is using it to run 555cc ones and said it's been working fairly well.

 

how's the eManage change everything at idle/cruising?

Why can the apexi not manage these also?

 

Because it requires an additional harness/software that you splice into the injectors to intercept the ground pulse.

The S-AFC just intercepts the MAF voltage. Nothing to do with injectors.

 

so then the only thing it would be good for is a car with no FMU?

How much are the eManage units going for?

 

On eBay, about $270 shipped new. But you would need the software for an extra $120, the injector harness, ignition harness, and pressure sensors to access all the functions. Ends up being about $600 for all of that. Otherwise, with the base unit, it does about the same thing as the SAFC, nothing more.

 

youch....

so then, in conclusion, the apexi afc isn't going to do anything for me since i've got the vortech fmu?

hmm... stock injectors for a while then...

 

oh yeah, anyone know how i can calculate boost from the impeller speed?

 

No, the AFC will still help even with the FMU. Remember, the FMU supplies fuel based on boost pressure and that alone. It's all based on ratios. But your car is not going to need fuel based on a linear ratio. The AFC allows you to tune your A/F ratio at different RPM points.

 

Alrighty, being a newb to forced induction management... let me see if i got it all:

The SAFC only monitors airflow and adjusts the fuel pressure of the stock fuel pump. So the more airflow, the more (based on how much you specify, based on the rpm points) fuel pressure... right?

The reason it won't work with the bigger injectors is because it can't manage how much fuel the injectors are qetting/spewing? I'm assuming we're talking about how big/long the pulses are.

The eManage, with all the extras, can manage the amount of fuel the injectors spits out (big/long pulse....) allowing it to tell the injectors to only spit out a little fuel or a lot of fuel based on airflow and rpm?

confusing...

 

Here you get the eManage, injector and ignition harnesses, and support tool for $450:
http://www.gruppe-s.com/

Correct me if I'm wrong Shadow, but isn't that everything BUT the pressure sensor to eliminate the MAF, which isn't necessary unless you're pushing 350+whp?

 

You are correct, the pressure sensor and harness are another $130 or so which is why I said $600 for everything. I'm ordering everything.

 

good info guys, keep it up!

 

I thought they couldn't control the ignition on the 350z greddy twin turbo car. I thought it would be the same on a maxima.......

 

i've been reading on some sights, that the SAFC can controll the number of injector pulses for use when using larger injectors... although it was an inferior car

http://www.vr4stealth.com/apexi_safc_install.htm

any thoughts?

 

any response?

 

S-AFCs will NOT control bigger injectors during closed-loop, ie non-WOT, operation due to 02-sensor feedback. Any MAF adjustments the S-AFC makes will be over-ridden by the ECU.

SAFCs are useful for FINE tuning during open-loop operation. It can tune out excess fuel at WOT from bigger injectors, but unless you plan on always running at WOT, it won't work.

 

You mean everyone doesn't run at WOT all the time? lol...

thanks for the info!

 

sx7r said he wasn't able to get the ignition control working with his J&S Safeguard. I believe he said either one worked by themselves, but he wasn't able to get them both working.

HNDA ETR - Running larger injectors on the maxima isn't really a common modification. The people who're doing it are running generally 300+fwhp. If you're planning on running this much, an extra couple of hundred for an eManage over a S-AFC isn't a big investment. Course, keep in mind, those of us with 270+fwhp are still pumping over 90psi through the stock ones, so if you're just doing it for safety reasons

 

I'm pretty sure that's not true. Unless sx7r was able to figure out something the GReddy eManage guys weren't, at least on the GReddy TT 350Z.

I think the J&S is better anyways.

 

i seem to recall reading somewhere that the ignition harness shouldn't be used on the e-manage...

anyone hear the same?

 

anyone have any idea about using the ignition harness on the 2K max?

 

I'd definately take the J&S too, if I had money flying out my butt.

Could be a mistake.