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post #1 of 15 Old 02-25-2019, 11:01 AM Thread Starter
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Boost controller selection

I currently have a greddy profec b spec 2 that’s a complete pain to dial in for boost control. It deals with percentages of boost and takes a lot of finagling to get a certain boost pressure dialed in. Is there a better option out there for setting a certain boost pressure, and is a little more user friendly?

I currently have 2 settings, basically a 8lb setting that’s off the wastegate springs and I have to go in and change all the parameters to jump to 15lbs. Just didn’t know if there was a system out there that you can actually dial a boost setting, say 15lbs, and that’s what it is? Mine I have to move to like 35%....

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post #2 of 15 Old 02-25-2019, 01:37 PM
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I don't have an answer but I feel your pain. For my Eboost2 I program the duty cycle of the bleeder valve to an arbitrary value then make a run to see what boost it ended up with. Then I try another value for the duty cycle and try it again..etc...
I have a 15psi spring (gets me 18psi of actual boost) and set the duty cycle to 71 (max of 100) to get me 32psi of boost.

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post #3 of 15 Old 02-25-2019, 03:17 PM Thread Starter
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I’ll definitely have to read up on it, thing is, I’m not sure what 100% is, therefore didn’t know how to base percentages. It was a pain changing 5 parameters just to make a pull and see what psi was actually going to the manifold. Seems like it could benefit from a simpler system!
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post #4 of 15 Old 02-25-2019, 04:05 PM
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I use a Boost Leash system on my car. It was very easy to dial in. It took me a bit to understand how it worked. Part of that was it is geared to the Turbo guys using a wategate I was using it on a positive displacement S/C using twin 50mm BOV's. It is a nice set up. They now have a updated system that makes adjustments in .01 seconds instead of the .1 that I have.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #5 of 15 Old 02-25-2019, 05:07 PM Thread Starter
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I’ll have to check it out, is it as simple as dialing in your boost level?
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post #6 of 15 Old 02-25-2019, 05:15 PM
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The MS3 can do boost by gear and boost by TPS. There's other ways too but this is how I do it.

I have 1st and 2nd gear on spring at 4psi on street tires. 3,4 and 5 are 12-13psi but if I spin the tires and let off, the boost will go to say 8 psi at half throttle as you try to pedal out of it..

I'm pretty sure you can put a switch in to toggle between different boost tables as well..
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post #7 of 15 Old 02-25-2019, 05:21 PM
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Kind of. It does not actually measure boost. It controls when the Wastgate opens based on what you dial it in for. I use twin BOV's. I use CO2 as a means of controlling the BOV's. I have 5 psi springs in the BOV's. With my car, I typically want to leave at 10 psi, so I have 5 psi [email protected] pressure to the back side of the BOV on the launch. I then dial in how fast I want to close the BOV using CO2 pressure. I usually have all of the boost (21 psi) by 1.5 seconds into the run. I can change the slope of the gain in boost in .1 sec increments. If I wanted to leave at 15 psi of boost, I would command the controller to have 10 psi of pressure on the back side of the BOV. (5 psi spring plus 10 psi of CO2 pressure). Fairly straight forward.

I ran the car last with no spring in the BOV and used CO2 pressure exclusively, but that caused intermittant issues with the BOV's coming off of their seat when idling around the pits because I did not activate the system until I went to do the burnout before a run. The compressor surge from the P/D S/C would sometimes cause the BOV's to open and make the car run like crap. So I installed the 5 psi springs to keep the BOV's close while idling around the pits.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #8 of 15 Old 02-25-2019, 05:59 PM
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There are a lot of ways to control the wg.
I personally use my ecu to monitor front and rear wheel speed. If the rear is spinning faster than the front the computer will put a lower duty pw on the boost solenoid and lower the boost. The bigger the difference in speed the less pressure the solenoid will put on the top of the gate. I was running 5psi springs in my last setup. At 50% duty cycle it would make 15psi. So I would just put the pedal to the floor and let the ECU do all the thinking for me. My friends would be amazed at watching the boost gauge going up and down and my foot not moving. I also use traction control which also looks at the wheel speed difference. If dropping the boost wasn't enough to control wheel spin the ECU would start to drop cylinders. Basically I set the desired amount of wheel spin I would accept. This also changed with the MPH.
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post #9 of 15 Old 02-25-2019, 06:33 PM Thread Starter
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ill have to call up leash tomorrow and see what all I can do with it, I understand they don’t measure boost, but how much pressure is added to the spring, which makes sense. Im just not sure how or what options I can use as an add on to my current factory system, I don’t have wheel speed sensor and it’s a mvb trans, so I’m wondering what options I can use to dial in boost per gear or whe speed. Would be a great idea to use it in conjunction with gear and wheel speed though! 15psi looks good on paper and maybe a dyno, but there’s no way I’m going to be able to put that power to the ground through all the gears.
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post #10 of 15 Old 02-25-2019, 08:11 PM
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Quote:
Originally Posted by stangjumper View Post
There are a lot of ways to control the wg.
I personally use my ecu to monitor front and rear wheel speed. If the rear is spinning faster than the front the computer will put a lower duty pw on the boost solenoid and lower the boost.
That works great until you launch and the front wheels are off of the ground for the first 20-30+ feet. Lol


1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #11 of 15 Old 02-25-2019, 08:14 PM
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Originally Posted by CrucialProspect View Post
15psi looks good on paper and maybe a dyno, but thereís no way Iím going to be able to put that power to the ground through all the gears.
Ummmm. How much power are you making that you can not put it all to the ground in all the gears?

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #12 of 15 Old 02-26-2019, 03:39 AM Thread Starter
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First gear is really my problem, I have addressed rear suspension since last year and I’m hoping that solves my wheel spin at the 1-2 shift, but I still like the idea or ramping in the boost.
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post #13 of 15 Old 02-26-2019, 11:57 AM
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I’d look into the eboost2, it’s a simple controller with some nice options, you won’t find a controller that you can say I want X number psi, the eboost2 should be able to double WG boost and it does boost by gear. If you want wider range you’ll need the co2 and you can put in the smallest spring and go from there.

Run whatever spring in the gate you want for launch and make adjustments for each gear, watch some videos on YouTube and see how easy it is to use.
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post #14 of 15 Old 02-27-2019, 10:32 PM
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Saleen414 you are right!!!
Fortunately I have a few other tables that control boost as well. I can set the min mph that the boost/ cylinders cuts as well as a time delay. I have a few more tricks to combat any other issues you might think of
It was definitely strange when the car pulled the wheels at the track. I definitely wasn't expecting it lol
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post #15 of 15 Old 04-14-2019, 06:10 PM
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I have a gfb gforce III on my turbo ls car. It doesnít do boost by gear or anything. What sold me though was the lean boost cut and of course overboost cut.

Really easy to set up and use also but like most boost controllers you are still messing with a percentage.

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