Hey, after reading up on the fluttering with VTA BOV and all I decided to turn up the boost to peak at 28psi and taper down to like 27/26psi. Only WOT for a little bit this morning, but the WOT is a lot smoother with less fluttering now that I turned it up. The idle is still holding up on the stock MAF; I'm waiting for taxes to purchase Walbro 255 fuel pump and some injectors to go E85 and tune for SD. Once that is done, the next step for me to get on a dyno to see what numbers I'm pulling. Others have pulled 400whp with similar setup minus the SD, so I am hoping for better.

Anyone with VTA BOV running on MAF have any similar issues with fluttering at low boost? Turning it up solve it? My tuner is saying that on 91 pump gas I need to turn the boost down a bit, but the car runs smoother WOT so I'm at a crossroads.

 

bump

 

If you want to blow your engine, keep that boost up. Otherwise leave it at what you are tuned for. 28 psi on 91 octane is just asking for a multi-thousand dollar mistake.

Turning up the boost is not a fix for the crappy driveability of VTA blow offs. Just get a recirc kit or another DV that can be recirc'd and be done with it. Don't cheap out.

 

I've been told that when you recirc the bov and add a aftermarket air filter its still quite loud and of course you dont have to worry about the stupid **** vta gets you.. Just what ive been told tho.. how i plan on going

 

It is plenty loud, but that's besides the point. It's moronic to turn your boost up to an unsafe, un-tuned level on low octane gas just so you can enjoy your ricer sounds while thinking you're solving the problem.

 

wow.

 

+1 Even with a Walbro pump and injectors, you should not raised up your boost that much. You need a recirculated bov for stock ecu tuning. When you go stand alone ecu, you can go with VTA with no or less problems.

PS: Listen to your tuner. He knows his stuff.

 

problem with the actual bov should not depend on whether its vta or recirc. after it blows off comes the ****ty part. If you are fluttering that means your spring is > than boost. So rather than turn boost up, loosen the bov. Much safer to do that than to match your boost pressure to the bov.

VTA + MAF = FAIL

 

What was your boost level prior to you turning it up?

 

Dude, never turn your boost up without a tune.....i mean really man, thats for Honda guys to do. You drive an Evo, have some class lol

 

I was at 25psi before. I brought it back down to 25, and I do trust the tuner, very much so. I am still very new to turbo engines, so I try and research everything I can. Thanks for the feedback, I think I'm just getting used to the power and am yearning for more. I was on this debate for a really long time about VTA vs. Recirc, but was assured that SD could alleviate a lot of issues. The thing is, I don't know for 100% certainty what kind of aftermarket I/C I have. Tuner and others in the area have stated that is was Buschur with Buschur piping. I was thinking about going recirc, but wanna wait till I SD tune first. And I can't do that until I get some money from taxes.

'Teal2nnr', I've seen some cars on here with 28psi on stock turbo and pump gas. What upgrades would allow them to do that with low octane fuel? I'm just trying to maximize the amount of power with the stuff already on there. That's why I wanna see where the WHP is at so we can see if the tune is lacking somewhere.

The thing that sux is the car came VTA with a crappy tune and still on MAF. Don't know what previous owner was trying to accomplish (and will never know), but I know I can get the evo where it needs to be. It will just take a little time.

Thanks again for input all.

 

maybe someone can help out with identifying the I/C...

If we can't identify it, what options do I have for getting a new upper I/C pipe?

 

To run lower octane fuel at higher boost you will definitely need a fuel pump, and larger injectors probably in the 800 range to be safe. If you are going SD and E-85 then you will need 1200s to be safe. Do yourself a favor and get a wideband before you grenade the motor. That way, you can safely play with the boost, and go driving and be able to see how much you have leaned the mix out by the readings on the WB O2. With the lower octane fuel, you might be able to turn the boost up, but you will have to decrease the timing to avoid knock.

I don't know what I/C that is, possibly a BR.

Be safe. Don't hate yourself later on.

 

For your own good please delete this thread. No tune + low octane + raised boost - Wahlbro 255 = recipe for motor damage. Have you even logged to see if there's any amount of knock? I wouldn't be surprised if you've already started damaging components of your motor.

This is the first time I've heard of tuning as a result of BOV sound.

 

yep, looks like a intercooler problem.