VSV How ImPortant are they?

[alloyguitar]

I see where you're coming from. It's always good to read up on it, and learn about the vehicle before messing with it. I wholeheartedly agree with you.

 

[jdub]

Well, in my opinion it really comes down to one decision: to daily drive, or not to daily drive?

For example, my car is NOT a daily driver, and does NOT see rain, or adverse weather of any kind. Furthermore, all the research that I had done prior to the the removal of my vsv's indicated that it was not necessary to the vehicle functioning as it should. If I have overlooked some sort of serious problem, please enlighten me, as the issue has yet to present itself in the 6+ years that they, along with the egr, have been relocated to the trash.

Bottom line is that, again in my opinion, if it's a daily driver, it should remain stock, and have every single thing that toyota intended to be on there present and functioning accordingly. Otherwise, it is a non-issue. Take duane, for example. Every photograph of his engine bay I have seen doesn't seem to have an egr present, and given the numbers that his car puts down, I would be under the impression that his motor would be held to a MUCH tighter tolerance than my own. Continuing in this thought process, any problem, however minute to me, would be much more severe to him.

So how MUCH of a problem does the absence of these components really pose, because if it's a big one, I'm probably up shit creek by now...

-Devon Goodspeed

That is precisely what I'm getting at. Your post:

I don't have any of the vsv's and haven't had a problem...

This implies that since you have not had a problem, there is no problem removing the VSVs and disabling their respective functions. This is a prime example of a logical fallacy.

You clarified in your post above...your car is not a daily driver driven in any adverse weather. The fuel pressure up VSV is designed to help hot starts by increasing fuel pressure...this situation is most likely to occur during a hot day (adverse weather). The EGR (besides emission issues), keeps cylinder temps lower (therefore EGT) and helps suppress detonation at less than WOT. The USDM ECU fuel/timing maps are tuned for it...remove at your own peril. Again, using Duane as an example is a logical fallacy (he doesn't have one on a high HP motor, so it's ok)...Duane is running a Motec standalone EMS. It doesn't apply were the EGR is concerned.

The bottom line concerning these VSVs is it is VERY situation dependant...you really need to think about what you are doing. And, when giving advise, show the whole picture as to why or why not.

I hope you see my point here.

 

[alloyguitar]

Modifying a vehicle at all is situationally dependent. My car does not have the same modifications as yours, and vise-versa, so if we spent all day writing paragraphs upon paragraphs explaining every minute detail about what it has done to our vehicles, we would never have time to actually work on the cars.

But I do see your point, I was just in a bit of a hurry at the time (leaving work) and didn't really have the energy in me to explain, I had just never heard of anybody having a problem with removing them. At least, not in first person, anyway.

Question though: I have a maf-t/saf-c/innovate lc-1 that I use to tune with (yes, I know the maf-t and the afc are redundant, but I like the rpm tuning ability of the afc), so would this eliminate my need to worry about the egr, since I can modify my fuel maps?

I'm assuming that timing would still be a bit of an issue. Am I right?

-Devon Goodspeed

 

[IJ.]

so if we spent all day writing paragraphs upon paragraphs explaining every minute detail about what it has done to our vehicles, we would never have time to actually work on the cars.

Not true

 

[jdub]

Modifying a vehicle at all is situationally dependent. My car does not have the same modifications as yours, and vise-versa, so if we spent all day writing paragraphs upon paragraphs explaining every minute detail about what it has done to our vehicles, we would never have time to actually work on the cars.

But I do see your point, I was just in a bit of a hurry at the time (leaving work) and didn't really have the energy in me to explain, I had just never heard of anybody having a problem with removing them. At least, not in first person, anyway.

Question though: I have a maf-t/saf-c/innovate lc-1 that I use to tune with (yes, I know the maf-t and the afc are redundant, but I like the rpm tuning ability of the afc), so would this eliminate my need to worry about the egr, since I can modify my fuel maps?

I'm assuming that timing would still be a bit of an issue. Am I right?

-Devon Goodspeed

I understand, but if you don't have the time, perhaps it would be best not to post at all.

You do have the ability to fine tune your fuel maps with the electronics...this is especially important at less than WOT. Just pay attention to what your AFRs are at cruise when the car is under load, like going up a fairly steep hill. I would be more prone to accept a slightly rich AFR under this condition without an EGR.

Timing is another matter...if you adjust your fuel correctly, it should not be a problem.