Mine opens right now at 5000rpm but was wondering if it would be better for it to open earlier because i have the stock redline. Is there any negatives with it opening earlier?

 

Get 2 dynos. One with the VI fully closed, and the other with it zip-tied open. See where the curves cross, and take it from there.

 

i dont know if I'm making this up, but I thought i saw thread where people said that the 00vi opens up at the best point and changing it would lose power. But i vaguely remember reading this/making this up.

 

If you're talking about an 00VI being swapped onto a 4th gen, then it's not going to open up at all unless you have an RPM switch and choose an RPM point to set it to open at. There have been several threads before on the subject along with comparative dyno runs (tied-open and deactivated). and if memory serves me correctly, the cross-over point was in the 4800-4900 range (regardless of where your redline is). Now that I give it a little thought,some things that might cause different results are (1) if you're using the JWT ECU, and (2) if you have FI.
If you're asking about using some sort of add-on device to change the actuation point on a 5th gen, then probably not worth the time, effort and money.

 

im gonna try to swap mine to 4800~ because at 4k my car CRAWLS, i have it opening at like 3800 i think

 

I currently have mine set at 4600. I've done some experimentation between 4600 and 5200 (every 100 RPM's) and 4600 feels best to me for now. Dyno proof would be better though, obviously. It's also going to differ slightly for some cars, I would think.

 

... I know you know better than the ass dyno!

 

I wasn't basing my RPM settings on the ass dyno, more so how the car physically pulled. You'd be surprised how much of a difference 200 RPM's can make in how it feels.

It's getting dyno'd this spring, keep your panties on

 

You're probably tuning for what you think the most obvious switchover is. If you can feel when the VIAS opens, you're losing torque somewhere. The switchover should be almost seamless.

 

I used to have my MEVI swithover @ 4200 just for sharts n giggles. But 5200 was the best.

 

This is absolutely right, and I believe there are a couple of dyno comarisons on the org showing the best switchover point. To be valid, they need to be on the same vehicle, corrected for prevailing atmospheric conditions, with the only difference being (1) the power valve tied open, and (2) the power valve disabled so as not to open at all. And the important thing is where the torque curves cross, i.e., where the pulling power shows improvement with the power valve open.
Using an LED indicator on my dash and slowly accelerating in 2nd gear, the indicator illuminates about 200 RPM after the point the switch has been set at. I'm inclined to believe my tach is reasonably accurate and not off by that about 200 RPM because my warm idle is right around 700, and my cut-off is right at the 7200 which JWT set the ECU to. So I reset my RPM switch for 4700 to effectively get the power valve open at 4900. Anyone who's outside of that 4600-5000 range is, IMNSHO, missing some potential.

 

Yeah my summit switch was set to 4800 but was opening at 3800. I just set it to 5800 hoping it'll open at 4800 , I haven't revved it with a friend watching it though so I donno.

 

IIRC, the Summit is programmed for a V8, not a V6 (the Harlan can be set up for either one specifically). Since Summit will be looking for 4 sparks per revolution instead of the Maxima's six, you'll need to swag the setting. I'm sure there are many guys who've done it and can clue you in on where to set it.

 

Yeah I know that its for v8's but I have no idea how it correlates like you were saying. Maybe someone can chime in.

 

for me im entering uncharted waters, lol ! bought a vq30de-k should be here this week. have no mechanical experience. so have my fingers crossed on being able to take off all the parts without breaking anything.

bought an engine because it cost the same as just buying each part, so got a super deal on it.

if you guys tell me what needs to be done as for as tuning and dyno proof i will be able to provide data. I have the greddy emanage ultimate and im having them install and tune the engine with oovi/EU.

just need to know what information I need to gather to bring back to the org. being a newbie to all this I went straight to this post because setting the oovi at a certain rpm hadnt crossed my mind.

further more i should do a full thread on Installing 00VI for dummies for all the non mechincal people like myself to go through a step by step procedure on removing the parts and then installing them.

I will have help on the install, so im in good hands there, but i seriously wonder how far I will get removing these parts off the engine, lol ! will just take the whole kitchen drawer outside with me to add to my chinese tool kit.

live and learn ! rofl !


cost me $800 NZ or $530 USD

 

I have mine set at 5100 IIRC. With the summit switch it has that adjustment screw inside to fine tune for what you set it at and when it actually opens. I had to play with that for a while to get it right.

 

My dyno testing last year at 50 rpm intervals showed 5000 rpm to be the best rpm point, for my car (ie my mods). 4950 would have been the 2nd choice, but it did create a bit more of a momentary drop than 5000 did.

 

dandymax.. can you list your mods?? so i can compare to mine.. and see where i need to set my activation point

 

Mods be found here: http://forums.maxima.org/showpost.ph...6&postcount=60

However, doing the dyno testing last year I had a stock 4th gen TB with Injen intake, not the custom intake and PF TB I have now.

Search the dyno forum for threads I've started too and you'll find the dyno charts.

 

If you make said thread, I will be very grateful as I have been looking into this but lack the mechanical apitude to try. With a 00vi for dummies guide available it would be a great addition to the .org for ppl like myself.

sorry for the sidetrack of the thread.

 

thanks for the replies....i plan on dynoing very soon, probably over thanksgiving break...

 

Make sure you get the best out of your dyno since you're auto.

 

oh def. should i dyno in second gear?

 

I understand the argument for where the two lines cross (valve open/valve closed), but isn't gearing a factor? With a 5-speed, it depends what the RPMs drop to after gear shifts if you're going to redline in each gear. For example, when you shift from 1st at 6500 RPM to 2nd gear, the RPMs drop to somewhere between 4K and 5K. You would want to ensure that the VI valve wasn't switching back for a split second on every upshift. In other words, if you're flooring it you want it to start open (closed?) until you reach the switchover point, and then you want it to stay closed (open) for the rest of the run, rather than having two switchovers in every gear. Bah, sorry if I'm not making any sense.

 

You ARE making sense. This is why it's great that the V-AFCII can have a seperate switchover point during engine deceleration.

 

I usually do.

 

Ah, clever!