My IX really came alive after switching it back to a MBC.

 

You went from 3 port back to MBC?

 

I started with a MBC, went to load-based 3-port, then MAP-based 3-port, and finally back to a MBC. I played around the the ECU-controlled boost setups for over a year and was never happy with it. In the end I realized it was time to stop dicking around and to let a simple spring do mechanical work rather than attempting to have the ECU control it. My turbo spooled faster, had better transient response, and saw the same peak power when I switched back to a MBC.

 

Hmmm, interesting, i will see what Shane thinks.

I know the X's have 3d boost tables and all that good ****, so he might say just stick with the perrin.

 

I prefer the 3 port on tephra v7. PSI, gear based boost control, Instant map switching to change from pump to e85...really there is no question which way is more versatile. You could even use a 3 port/v7 to run higher boost with meth or e85, and normal boost on pump, all with the flick of a switch. Plus, I love having a completely flat boost curve, peaks at 22.5 and only tapers to 22 by 7500...not too bad.

 

My IX saw no additional power by holding a flat boost curve to redline since I had to pull timing back. With the MBC as boost tapered I just added timing back and the top end made identical power. When I was set to 26 peak it would taper down to 22, with 24 peak it would taper to about 21.

 

I like the school of thought that the "simplest answer is usually the best"...so maybe a MBC will be in my future.

 

That applies sometimes, but not in all cases.

For example, carburetors are way simplier than electronic fuel injection and can still make an engine run pretty damn well. Would you go back to carbs though?

I liken the MBC to carbs, and electronic boost control to electronic fuel injection. Sure, getting EBC to work well takes more time, but the end result is better.

Kracka, you give the example of the MBC tapering and then adding more timing to make the same power as keeping the boost constant with EBC. You could have just as easily tapered the boost with the EBC also.

 

It would've affected peak boost though on the MBC, since it is a constant.

I doubt i switch unless i can't get my bogging during shifts fixed, no idea what it is from.

 

I ended up doing that, which made me realize what a waste it was on my car and promptly switched back to a $35 MBC

 

haha. No, I just knew that Shane had just tuned your car with one. Some tuners simply won't deal with anything but their preferred method. Ron @RS just uses boost pills, for example.

EBCS are perhaps $70, depending on what brand you buy. Price is hardly a factor.

 

Heck, using the stock ecu controlled EBC, it's FREE!!! I think I read Tephra figured out a way to do speed dependent boost control; this is a big benefit for the guys running big turbos and having issues with surge in 4th and 5th gear. No way to do that with a MBC.

Oh, and by using the ecu to control boost, it automatically compenstates for weather and altitude changes. You'd have to manually adjust the MBC.

 

Doesn't matter on the speed one now...we have gear based mivec

 

Theoretically. I had ****ty luck with it. My MBC was far more consistent.

 

MBC was way too erratic, inconsistent, & spiked a lot, so I switched back to stock.