Had my Evo x tuned yesterday by Shariff at forged in georgia . The shop is awesome , all the guys are real cool an sharif is a awesome tuner. The only problem I have now is in 5 th gear my hks is fluttering alot as I accelererate under throttle as once it hits 20 psi or higher it's start to flutter and blow off while I still have the pedal accelerating causing stuttering and almost stalling.

The car put down 302hp at 28 Psi on a Dyno dynamics Dyno.

Mods are:

Injen intake & uicp
Grim speed Ebcs
Hks ssqv3 bov
Hks hi power exhaust
Ets 200 cel hi flow cat
Cobb access port
Works short shifter
Forged performance tune

My thoughts our is that the hks is blowing off under to much boost and needs the spring to be tighter but its not adjustable so I don't know ? Help ?

Thanx
Marco

 

Is the EBC running off the same vacuum line as the blowoff valve? I'd say 95% sure thats your problem unless you have a really weak spring in the HKS.

 

I'm actually not sure cus the installed it at forged performance when the tuned it . Do you have a pic of how it should look . It's so upsetting after all the money I spent on the tune and I can't even go in 5 th gear .

I appreciate all the help

Marco

 

You just have to look at the line going to the BOV and see if it is Teed and going to the EBCS also.

There is a potential that its just overboosting in 5th also so as the correction kicks in the boost is reduced and the BOV needs to bleed off a little. That should be tuned out but it is very common for it not to be. 5th is a strange bird when you want the rest of the gears to run their best... tons of load, really low RPM spool, and all kinds of other oddities.

....did you ask the tuner yet? If not that would be my first step.

 

The ebc is the grimspeed 3 port Ebcs so I don't think that's the case cus each port has a line run to 3 different sources . If you have a photo or diagram of what u suggest I'd like to see so Ivan go look under the hood .

 

I'm gonna try going to see shariff@ forged today , cus in 5 th gear and cruising around 60 and I put the pedal down as soon as the boost start to read 20psi it's starts to blow off boost ( fluttering ) causing the car to stutter and almost stall , and that is under acceleration not off acceleration.

 

I can't draw a diagram since if this was done the sources would not be the same as from the factory. You literally pick up the line, look at it, and see if one of the lines that connects to the BOV also connects to the EBCS. It really can't get any simpler than that.

Both the EBCS and BOV require a pressure source for input. It is very common for people to use the same source for both of them. As the EBCS bleeds off some air from the BOV line to open the wastegate it reduces the pressure just enough to open the BOV sometimes.

 

Ok I understand what you mean , if it is teed off using the same source then what other source should you use to do it correctly .

Thanx
Marco

 

Isn't 28 psi a little too high for a stock engine? Also, flooring it in 5th gear at low rpms is a good way to blow up stuff.

 

The above comment was my thoughts also.

Stay out of WOT in 5th gear unless you are going 90+ mph.

 

The EBCS should ideally source from the J-pipe / turbo outlet (always positive pressure). The BOV needs to source from the intake manifold (it usually does but runs through a hard-line next to the valve cover if your BOV is in the stock location - this provides vacuum when the throttle closes).

Somehow I didn't notice that. Agreed with both of the above. Stock engine can handle 28 psi, but if anything is out of the ordinary (especially on pump gas) expect a rod through an engine vent somewhere.

 

Flutter seems to be common with our 3ports. Several people complained about it in a few threads. I get it slightly in 3rd and 4th when coming in to boost. I'm sure it's in 5th, but I never tried hitting full boost at low rpms in 5th. The explanation I got was that with a 3 port the boost comes on too quickly and causes a bit of flutter. Others say its the way the 3 port is setup. ???

 

Coming on too quickly would imply that error correction is set too aggressively, which is generally accurate. You can check to see if the error correction table is stock which might clue you in.

 

So I had him tak her out and check it out he took his lap top and said it was a little to high boost up top so he reduced it but said he made it a little higher in the lower gears . So it doesn't do it now but I still get some flutter just not like before . I really think of I get rid of the hks I will probaly be happier . I'm at 26psi now instead of 28 psi is why he tuned now . But the hks is a little to touchy and when I had the stock nov I never acted as bad .

Since I just added the hks and the grimspeed I love the power but not the daily drivability , I may keep the grimspeed but change the bov an hopefully it will be a little less *****y.

Any suggestion on a nice bov that has a good sound to it that works very good on drivability.

Thanx. Guys

 

I think your overboosting in 5th gear