NX 150 shot and VEC-1 together(any problems ?)

[twinvipers]

I'm installing my NX 150 wet kit next week. Someone suggested there might be a problem with the VEC-1 and the NOS together. I can't see any reason for this, but maybe someone can help ?

Only other mods are B&B cat-back,tubes and K&N's

Made 447 RWHP

Looking for close to 600RWHP with the NOS

 

[Snake Bitten]

I totally love it...no problems whatsoever...It was rather easy to tune the nitrous with the VEC1...

 

[twinvipers]

Hey Snake Bitten

any 1/4 mile times or dyno numbers ? What other mods ?

 

[Snake Bitten]

The first and only time I took my RT drag racing was a couple of weeks ago...on street tires, Pilots, and had no traction... 12.544 at 122.21 mph ... I need alot more practice...I have 3.45 gears...

I am still jetting up...Last dyno with the 100 shot was 520 rwhp and 580 rwtq...I still have some tuning to do with the jets, but the VEC1 is a bonus on the spray...

I ordered the BFG drag radials this last week, which should solve the traction problem and I should be able to get back to the dyno late next week, for some more tuning...


Keep us posted how your install and tuning goes...

 

[Jack B]

Snake Bitten:

No flame intended, however,what do you expect to gain with the VEC1 that you cannot do with proper jetting. Remember the VEC1 moves timing and a/f at the same time. N2O tuning is difficult enough without entering multiple variables, simple is always better, especially when the engine is at risk. To achieve the proper a/f I do not believe you should have a series of devices, when it can be done with jetting alone.

A NA car, different story, the VEC1 has merit.

 

[Snake Bitten]

I didn't expect to "gain" anything except optimal A/F with the touch of a dial...

Are you suggesting that the VEC1 is placing my engine at risk???



BTW: I jet toward the phat side, then lean out a bit with the VEC1...works bbbeeeeaaauuuutifully!!!

 

[Nexus-6]

I've heard that the VEC1 takes a bit of time to adjust when the nitrous hits - it was somewhere on this site and I just read it the other night (older post I believe). I have no idea if this has any merit whatsoever...just something someone brought up at one point and something to research probably.

I would speak with Sean Roe and perhaps Tom Welch to get their insight and opinions. I'm sure they've heard good/bad/otherwise directly from customers set up this way in the field.

 

[Jack B]

Snakebitten:

Not at all - optimum a/f on a N2O car is first achieved with proper jetting. Jets are fixed entities and their results are repeatable every time. Why add the VEC1, in affect you are than using two devices to achieve the same end. In addition, the VEC1 has a learning curve, from my experience on the dyno with the VEC1, what you see on a dyno immediately after a change in the VEC's settings, is not what you will see tomorrow. That is OK on a NA car, maybe not the best on a N2O car.

What happens when you run NA, do you change the VEC settings. What happens if you forget in the heat of battle to change it back. Also throw in the fact that the settings don't change instantaneously. The whole VEC scenario on N2O is to ify. Once you get your jets set right nothing else should be needed, isn't that far simpler.

If my car had mods and no N2O, I wouldn't be without the VEC.


NEXUS-6:

Good point, maybe Tom or Sean will chime in. Tom already had a post about two years ago where he talked about the difficulties of using the VEC1 to tune a N2O car.

 

[Snake Bitten]

I don't change the VEC1, I tune it on N20 and I leave it on the same settings running N/A...I don't mind running a bit rich around town...If someone wants to try me, I'm turning the spray on anyway...The VEC1 works great for me...

Maybe Scotty TOOOFST can chime in on his VEC1 setup...

 

[TOOOFST]

Ol Jack's right.The VEC-1 can fine tune and the a/f gage is cool.
I've been using the VEC-1 with all my nitrous car installs.So far,"Butch the Snake"check out his posts,went 10.42's back to back runs at an illinois VCA event.It was a combination of the TOOFAST NOS/VEC-1 set up.
The VEC-1 makes some extra horses throughout the curve,once you've got it set,then you play with the nitrous jetting,and you don't have to ever change the high/low dials.Set it and forget it.
It's a 2 fer 1 deal best hp N/A and NOS.We've gotten up to 692rw with stock fuel on the dyno.I dyno'd 653 at our recent dyno day and go 134mph(bone stock motor) all day!

 

[WESTCOAST JASON]

I ran the VEC1 with my 300NX kit problem free for AGES. I am not sure as to how changing it would have effected it though since I had the VEC1 set and left alone during the life of my NX install.

.02

 

[MES]

I've used the VEC1 and nitrous. The problem comes if you tune the VEC1 for non-nitrous use, then forget to change it back for nitrous use before spraying. I got some pinning a couple of times by forgetting to change it before using nitrous. I think it was due to too much timing advance, not going lean. If you tune it for nitrous use and leave it there you should be fine but then your going to give up HP the other 99.9% of the time when your not using nitrous.

 

[Snakester]

When I took my car to the dyno to check out the N20 A/F I left the VEC-1 initially the same as it was tuned for best N/A power and it worked fine.

I'm jetted too rich now, but I did a few dyno runs with the VEC-1 set higher or lower and the power produced was less than the optimal N/A VEC-1 setting.

It may have just been coincidence, but the N/A VEC-1 settings were the best for me with the N20 as well, so I don't have to change them.

I'm sure that N2O tank pressure and gas quality also affect potential pinging, but mine was jetting too rich to know for sure.

-Dean.

 

[BigCarrot]

My thinking is that you use the Vec1 to flatten out the A/F curve. It's too lean on the low side and too rich on the top end. It seems like it would be good to have with nitrous. Wouldn't it be more consistent? Safer on the bottom, and more power on the top? I guess the concern would be with the timing. Not sure what exactly the Vec1 does to timing, but I guess that could be the issue.

 

[Jack B]

Big Carrot:

To answer your question, the VEC1 extracts timing as it adds fuel. The point that everyone is ignoring is that once you have your air fuel set with the jets, what else can the VEC1 add - nobody has addressed that. As it extracts timing you will loose hp. It is also limited in how much fuel it can add at peak hp (on the bottle) since the injectors are maxing out.

You can go as rich as you want with the jets alone, on the other hand you will run out of N2O first with sprayers in the tubes. The best that a single bi-sprayer will do is 240-250 flywheel hp, you need a second sprayer/solenoid system to go beyond the 250 fwhp. Everyone claims how much hp they get with the Vec1, they would probably get the same or more without it

The other issue is that is not being acknowledged is that the VEC1 has to learn and unlearn, what you set it at before a pull is not what it will be a day later. In other words when you leave the dyno, tomorrow your a/f and hp will be different. Someone else made a interesting comment, if you set it for N2O and leave it there the other 99% of the time (off bottle) you will be sacrificing hp.

I tried to make it work, however, after multiple sets of pulls and no hp gain I pulled it out. I have over 100 pulls trying to get the most out of my car. I added about 7 hp with the Vec1 prior to putting in the N2O. I would still use it if I didn't have the bottle.

 

[Snakester]

Jack,

Yes, that's a good point about the VEC-1 needing time to relearn and remap everything.

For me, I may use the N2O once every couple months, but I drive the car N/A every day, and I definitely noticed a real improvement in low-to-mid range throttle response with the VEC-1 added. The lack of stumbling and positive power feel is like driving at night with cool chilled air. It just feels stronger.

As far as the VEC-1 with the N2O, I was nowhere near going lean or pinging with my jetting, and my best dyno numbers were with my standard N/A VEC-1 settings. So it's win-win setup for me.

I'll have to see how it looks when I've got the jetting right and dyno the car again.

-Dean.