RonSSNova

iTrader: (3)

Hey all,

Put my buddies 408 S480 on the dyno this weekend.
After having issues last year with his old controller, he bought a new fancier unit. It claimed a 30psi range......

With a 12lb Spring, it would adjust to 18psi.
So we changed to a 15psi Spring, it made 20 max.

Gate is a Godspeed 50mm.
I air checked and it indeed works.

I'm thinking exh pressure is now opening the gate as the MBC set to max effectively shuts off the boost to the gate.

Thoughts?
I'm thinking its time for an electronic controller connected to the top and bottom of the gate.

Ron

3 window

iTrader: (1)

Have you been able to log back pressure? Seems like a 15 psi spring should get you more than 20 psi with the MBC maxed out. If that's all you can get, then I'd agree, time for pressure to the top of the gate. You can use the MBC to the top of the gate, it just needs to bleed the pressure so it doesn't get trapped in the gate. Forcefed86 has a small bleeder hole in his line to the top of the gate. He's got a huge range if adjustment with his setup like 8-25 psi.

JoeNova

Ball and spring boost controller?

I've ran 3 different eBay controllers to 30 PSI on a 5 PSI spring. Never spent more than $20 on any of them. I usually end up getting rid of them because i start on a project and forget to get them a controller, so I donate mine lol.

roastin240

iTrader: (13)

I ran into this on a past build.

12psi spring with boost controller could be adjusted to a MAX of about 18-19psi (when the back pressure opened the gate)

18psi spring could only get me 24psi MAX.

Maybe I should note that all cylinders exhaust slammed right into the gate valve face at the 90 degree bend going into the turbo, so I am sure this had something to do with it also.

Your have 2 options, pressurize the other side of the diaphragm and/or install a stiffer spring.

3 window

iTrader: (1)

I could see the same issue!

stevieturbo

And same response as absolutely every other query.

Draw a schematic of exactly how you have it configured. There are so many ways to do it right, and wrong. Even pipe diameters and lengths can affect performance as well as the obvious of making sure the mechanical side actually works too.

And depending on the style of valve you're using....you may well be able to use both chambers of the gate anyway without going electronic.

BUT....EBC's just make adjustments so much easier, I wouldnt even bother with mechanical valves

Forcefed86

iTrader: (4)

I had a setup that acted the same.

As mentioned it depends how you plumb it. I ran a ball valve on my lower WG port and an adjustable bleed to the top port. I closed the lower ball valve at the track and it instantly net me 20lbs. Then adjusted the in car regulator to up the boost from there. open the lower port and close the top for low boost street driving.

RonSSNova

iTrader: (3)

Thanks guys.
All answers I figured on!
I'll have him pick up an EBC.

Another friend I dynoed had the turbo smart eboost 2.
Of all the various ones that have come across the dyno, it seemed to work the best.

May also look at the Gforce 2.

I'm going to want one for the nova as well.

Ron

67Firebird455

iTrader: (27)

So that's the boost controller to get huh? I was eyeing the turbosmart eboost2. I need a controller that'll ramp in boost based on RPM.

stevieturbo

EBoost2 can ramp with rpm, although looks a bit fiddly to set up.

Oddly, not too many controllers seem to offer that feature. If you wanted to be sneaky you could probably pretend rpm is vehicle speed and use it in that manner instead with a suitable VSS.

It's still shocking that even today, there are so few controllers out there that offer either boost by speed, rpm, or gear.

Forcefed86

iTrader: (4)

For the cost of those units you could almost buy an MS3. Has many more options, boost by speed, boost by rpm, traction control etc... Not to mention programmable PWM outputs and many other input/output options. Also capable of running the engine.

stevieturbo

Yea, the cost of some of them is silly. You could even buy an aftermarket ecu and only use it for the boost control and it'd still be cheaper than some boost controllers lol

RonSSNova

iTrader: (3)

Sounds like mega Squirt needs to get into the boost controller business.

BTW, this car has gone 9.01@150 at 3700 lbs.
He wants mid 8's.

Forcefed86

iTrader: (4)

Technically the $300 micro squirt could be used. They already use it with 2 VSS inputs on the trans control. It has a PWM output that can be used for a boost control valve as well. That means it should do boost by speed, rpm, and TC.

93camaro_zzz

iTrader: (13)

My manual boost controller allows me to controll up to 21psi. It has been pretty good for $11.

Edit: I assume from your post you are referencing the bottom of the gate. You think you could try to put the MBC to the top of the gate to get some more out of it?

RonSSNova

iTrader: (3)

I put a MBC on my car. It was nice to turn the ****.
At my age I forget where it's at.....

It also doesn't solve the boost step per gear. I believe with an electronic controller, I'll get same boost in every gear.

I bought two of the eboost 2's.

While it's nice to consider going a new direction with M squirt etc, this isn't my car. Although I'm going to rebuild his hot side, and wiring.....

My engine is stuck in builder limbo, so might as well make some money while I wait for my short block to be done

69-chvl

iTrader: (11)

Would another "piggy back" ecu work w/o hooking up things like crank/cam etc etc sensors? It would be easy enough to give the ecu an rpm signal, the other stuff would be tough.

But it is certainly an interesting option to look into as far as controlling boost and meth etc.

Forcefed86

iTrader: (4)

No reason not to hook it up to the crank/cam sensors to get the RPM signal. You can “T” into the same sensor and run both ECU’s off the same sensor.

stevieturbo

The crank trigger IS where an ecu gets its rpm reading from.

And yes you can easily piggyback this off the factory ecu wiring.

Nothing an aftermarket ecu would need to function as a boost controller would be tough in terms of wiring.

Hell, even to piggy back to take control of fuel or sparks wouldnt be tough either. Maybe a little time consuming, but not tough.

RonSSNova

iTrader: (3)

So I offered to do some updates to this car. It's in my garage now.
I'll be wiring in the boost controller as well as adding a new electric fan.
To do that I neede to rebuild the hot side.

Someone mentioned boost leaks?

I found no less than 30 leaks in the welding job. Along with one large crack.....

The cold side not too much better.

Amazing it makes the power it does. Should be better when I'm done!