refresh951

Did I steal that from you? Thanks mate. At least I did not use it to sell something on Ebay.

Paulyy

zerMATT951

I've been wondering about a dual parallel (rather than series) MBC setup with a solenoid or two to select which MBC is being used. This wouldn't do anything to flatten the torque curve, but it would let me put a little button or switch in the car to let me select between a standard "commuting" psi like 15-16, and a "fun" psi like 19-20 when I want to have fun with a new Vette, Carrera, etc.

refresh951

This Z06 was tuning when I got to the dyno last night. It had reworked heads, cam, and custom intake. It was putting down 580 HP!

teamcrossworks

Would you suggest something like the AEM Tru-Boost?

nics951

That diagram showing wastegate/boost control. (old, new boost controller) would that work for mbc and LR boost enhancer?

zerMATT951

Nice! For what it's worth, I'm a Chevy fan too, but I don't have Z06 money lying around so I drive this car with something like $14k total invested and I'm very happy with my decision.

Oh, and to be clear, even at 20 psi, I would be b*tch-slapped by that particular Z06! And for the record, I expect that even a stock C6 Z06 would eat my lunch... but I guarantee I'd surprise him!!

refresh951

I would not think so. The way I was adjusting boost was to leave the new MBC (ball and spring) wide open and adjust boost with the old MBC (LR unit) to within 2 or 3 psi of peak, then use the ball and spring MBC to dial it in the rest of the way.

The setup was really just a fun experiment.

Zeff

Nice info, I was/am having that issue too with the LR MBC. I asked this question a while back and I believe that an EBC was the only option to hold boost to redline.

refresh951

Zeff, what spring are you using in your WG? I think I am going to try a 1.2 bar spring.

User 52121

Thanks

I know some of the less expensive EBC options just work by setting a fixed duty cycle. They don't use any kind of feedback loop where it attempts to adjust duty cycle to increase boost that's fallen off. In which case, you wind up with exactly what you're dealing with now with the MBC. Only advantage is you generally get slightly quicker spool up since most EBC's allow you to set them up so that they stay "off" until a set pressure point before the solenoid starts to cycle.

Maybe that "Tru-Boost" that crossworks mentioned has a sort of feedback loop in it?

User 52121

Yeah it doesn't take much to make big power out of those

Starting off with 7 liters worth of engine helps though!

74goldtarga

580 hp / 7L = 83 hp/L
348 hp / 2.5L = 139 hp/L - Credit where credit is due

This is the part of the thread where someone suggests that we should all replace our turbo motors with Chevy V8 LSX, duly noted, just saved you the trouble.

I know very little (to nothing) about dynos - do they measure instantaneous torque and then calculate/derive horsepower or are they measuring something else?

I am encouraged by this as it matches my goals for my build, 18psi on E85 with MAF and about 350 whp. If you find an EBC that works for you please post your results.

toddk911

I have used several types of mbc both cheap and more expensive. I have never had boost roll off from any of them. If you have a tial and non k26 which runs out of steam, then you have a leak somewhere.

Even with an old guru modded wg and cheater k26 I was able to make and hold 18psi to redline. The only times it didn't was when there were leaks.

refresh951

I do not think I have a compressor side leak. I have pressure tested the intake and everything looks good.

I am curious as to what spring others are typically using when running higher boost in the Tial 38mm. Mine is 0.9 Bar, that was the spring it came with when I purchased it new. I am really starting to think the WG is cracking open a bit resulting in the gradual decrease in boost pressure. I will surely post here when I find the cause.