its mainly because of the temperature swing, but the bov doesn't help matters any leaking air out lol.

 

i am saying it could be the bov that causing power loss if opens too early i know they are only good up to ard 26 psi.also i will do a boost leak test as well.
Quick question also how much can u smooth out the lope on the s2 at idle?and where is your idle usually at with cams 950 rpm or 1k rpm?

 

I agree with Tom. Lower temps are going to give you more power due to the cold dense air.

I'm sure your tuner did a boost leak test. Did the BOV leak? If so, upgrade. You're putting a lot of money into it, why not get a good BOV? Do you have or plan on a UICP? You can get one with a Tial BOV flange on it and VTA if your SD or recirculate if MAF.

I like to idle S2's at 1100-1200 rpms to smooth it out. Some guys like me to give them more lope so I go down to 950-1000. Timing can affect that too.

 

no boost leak was done i would have thought they would have done done, but i am gonna get it done next wk to make sure no leaks.I am not planning on upgrading the uicp, i was looking into more like the forge RS recirculating where i can just bolt it on thanks.

 

remember that these cams are pretty big for a stock turbo....im pretty sure when you upgrade to a larger turbo it will really show the difference...

 

I like my Forge BOV. It never leaked in the 5 years I've had it. I'm using it on my SD set up for the last year and it works as a VTA also if you ever decide to go SD. I'm going to get the Tial or TurboSmart 50mm to see if there is a difference.

 

I put down a 2.0s 60' ft and still managed to get a 12.55. I think at that time I was putting down less power than you. This was on stock cams stock turbo on E85.



I think your Evo should be faster.

 

The temp does have a lot do with it, at least it did on my car. On my old setup with BBK-3B/ HKS cams in 93 degree temps my car put down 441 hp/ 395 trq and those were std correction. The uncorrected #'s if I recall were 418 hp but not sure about the torque. I then went there on a nice 35 degree day and put down 466 hp/ 418 trq uncorrected with nothing changed other then the about 60 degree temp difference. So as you can see if you just compare the uncorrected hp #'s theres a +48 hp increase.

 

I do agree with cooler temps, hopefully it makes more on a cooler day as u.
another problem also is we weren't able to up the boost as for some reason car won't go pass 27 psi.We crushed the bov but i think its messed up now.I am looking into getting a proper bov that will hold more boost and perform boost leak test.

 

they can be smoothed out enough to idle like stock almost.

My customer with 330WHP in vd dynojet went 12.6 @ 111mph last week.

 

Thats odd because I was having the same problem as you, when I had my old FP green swapped for the BBK-3B and then had the car retuned my metal mr bov would not hold boost. When the green was in it would spike 30 and then taper to 24-25, but it wouldn't even go past 27 with the BBK-3B. We try crushing the bov but it didn't do anything, so went with a forge rs and works like a champ.

 

thanks for sharing this i will get one for sure and see how it goes .

 

No problem I hope it works out for you, keep us posted.

 

ok i just installed my forge rs bov today and with some adjustments to the spring back and forth i had to eventually back down boost as i was spiking more than 30 psi now.Before i was not going pass 27 psi, car feels good so hopefully i can take the car to the track soon to see what it does.I guess i can now say my old evox valve was leaking?

 

awesome gains bro!