Hi I'm planning on switching to e85. I am still on a stock EVO IX turbo I currently have a halman pro rx but i want something that will help with the taper assuming i will run 30 psi of boost. if you can post what boost controller you are using and what boost you have by 7k that should help me decide which is best. thanks.

 

the stock ECU works the best. You will need a good tuner to reprogram your ECU for e85, might as well use the stock BCS..

You will want to upgrade to a GM BCS, or you can subsitute a Perrin or Gruppe-s BCS. Reprogramming your ECU will be required to use any of these peices.

 

Good question. I choose to use an MBC, as I see it as a safety valve of sorts. There are lots of EVO's hitting 30 psi with boost taper. I think there are far fewer stock EVO's running 30 psi at red line. Obviously you will need a stouter turbo as well, but you already knew that.

I'm quite happy with 28psi tapering to 22psi, but I'm all about torque.

 

yeah i figured gm 3 port is the way to go or if you can afford an expensive ebc like the hks evc 6. i also need to port out my hot side to help a little. i want to hold more boost up to for a bit more hp as well as to maximize my stock turbo.

 

The aftermarket boost controllers tend to have a hell of a time controlling a quick responding stock style turbo.

 

I'm running the Buschur MBC and love it. Hit 30 psi with minimum taper. The response and drive ability of the MBC is awesome. Just my .02

 

Its all relative. My friend tried the buschur MBC on his stock turboed car and it tapered just as bad as his 5 year old Joe P MBC. The stock turbo needs the wastegate physically vented to atmosphere in the higher rpm's, like above 6000rpm's. An MBC is physically incapable of this. The ECU based boost w/GM 3 port can accomplish this.

Also the EBC's on the market are reaction feedback based. They have a little "fuzzy logic" as they call it, but it works very poor for a well exhausted stock turbo. You need a boost control system that knows what is going to happen next and makes changed based off of what a user plugs in. This is what the ECU based boost does.

I've seen nearly every MBC and EBC on the market. Ranging from $20 to $1200. The ECU based works best for stock turboed evos.

Now, for upgraded turbo cars. I still use and love MBC's. I've been using them in my DSM since 2001 and I've yet to find anything that works as well as this puppy.

 

thanks for all the input. my halman responds very well but i want to decrease my taper so i guess i will try the ecu controlled boost with a gm 3 port. good thing about the gm 3 port is its cheap and based on what i have read in this forums it performs well for our cars.

 

Indeed it did......sometimes I miss seeing the old school brass joe p. in my car

GM 3-port is the way to go for sure, I know of a local that ditched his hks ebc and went with ecu-controlled boost.

 

I have the HKS EVC6. With my FP Green I was tapering to 21psi by 7k. I adjusted my Evc6 and I now hold 24.5psi at 7k and 23psi at 8k.

 

thats pretty good. what is your peak boost when this happens?

 

30psi and 27psi

 

Are you saying when boost is set at 30 it tapers to 24.5psi and when set at 27 it tapers to 23psi? Sorry, but I'm easy confused.

 

All manual boost controllers will taper off at the top, even on low boost. Electronic boost controller will correct it when set up properly.

 

I think you are too used to thinking in terms of MBCs and the cheaper EBCs. The better (more expensive) EBCs allow setting target boost settings at several points across the rpm range. The stock ECU boost control algorithm has the same feature. With this feature, "peak" boost is nearly irrelevant to the boost acheivable at high rpm. With my ECU-based boost control, whether I set the boost to 15 or 27 psi at 4000 rpm, I can still hit 22 psi at 7000 rpm (My boost level at 7000 rpm is relatively anemic because I'm still using the stock BCS and an HFC).