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Is the boost level a car builds on the two-step similar to what the car would make during a pass?
I changed my boost control over to compressed air so I kind of have to start over with my duty cycles.
It made 4 lbs. on the brake at 3,000rpm and I'm wondering if that's all it will make or if I have to make a pull.
Any thoughts?
Curious as to how you used compressed air? An onboard compressor?
Yes sir, the previous owner had installed a Viair compressor which he intended to use for boost control and airing up the tires or anything else when I bought the car.
I was going to remove it but it was all brand new stuff so I decided to sort out the wiring and try using it for boost control which so far I like it.
For the Cortex (Holley is a different animal) you simply run the compressed air line to one side of the Mac valve, set the dome pressure relatively close to your max boost target then start dialing in the duty cycle.
Went for a short drive yesterday and got back to where I was initially, maybe it was just me but it felt like it came up on boost quite a bit quicker than before, it hit the boost cut really fast, it may have started getting into the compressor efficiency range and started taking off too, I'll know more once spring gets closer.
The only caveat and Rotary1307 mentioned this is the compressor kicks on periodically, it's pretty quiet though and only for a few seconds at a time plus with my fender dump the car is so loud anyways I really don't care.
I really just wanted to try something different and since the majority of the heavy lifting was already done I figured why not, plus its really easy to go back to using the turbo if I want.
Thanks for the info.
I just swapped on a Boost Leash controller, and am going to try boost reference first, then compressed air uf need be. Goobeinfo.unatnks for sharing
Thanks for the info.
I just swapped on a Boost Leash controller, and am going to try boost reference first, then compressed air uf need be. Goobeinfo.unatnks for sharing
Find out if the Boost Leash is a Dome Pressure controller or a Duty Cycle controller.
Dome Pressure won't cycle the compressor nearly as much.
You're supposed to be able to have a wider range of boost so if you wanted really light WG springs and still run moon boost you can do that.
I believe it is dome pressure. I had to use a 2nd fitting on the top (dome) of the one gate (I have 2, and both gates are hooked together, obviously.)
I mainly switched fo this one for the launch control feature. Mine would make 5 or 15psi on launch...lol. This one supposedly works very well. We shall see.
It came wth its own MAP sensor and 2 Clifford (instead of mac) valves. And up to 5 time based stages of boost. I havent driven it yet...just did the install yesterday.
They did recommend using w/g springs at 1/2 of your desired boost, sonI swapped in 10#ers, instead of the 4#ers I have had. The 4# ones made 24.5#, so I "hope" the 10# will make 28-30. If that don't get me an 8, it isn't in the cards for.mr, I guess, lol
I believe it is dome pressure. I had to use a 2nd fitting on the top (dome) of the one gate (I have 2, and both gates are hooked together, obviously.)
I mainly switched fo this one for the launch control feature. Mine would make 5 or 15psi on launch...lol. This one supposedly works very well. We shall see.
It came wth its own MAP sensor and 2 Clifford (instead of mac) valves. And up to 5 time based stages of boost. I havent driven it yet...just did the install yesterday.
They did recommend using w/g springs at 1/2 of your desired boost, sonI swapped in 10#ers, instead of the 4#ers I have had. The 4# ones made 24.5#, so I "hope" the 10# will make 28-30. If that don't get me an 8, it isn't in the cards for.mr, I guess, lol
How did you go about building more boost on the brake?
Raising the RPM or did you play with timing at all?
Mine currently makes 5 lbs. on the brake at 3,000rpm so I'm starting to explore avenues for making more should the car take it.
Some knucklehead (me), last time to track, inadvertently turned his MSD 2 step RPM up to 5300, instead of 3500. I wasn't paying attention, or whatever.
It made 15+ psi, which immediately blew the tires off. I also had another stupid issue, that ended the day, so I just spent the rest of the day helping my son run his turbo car.
I still run a P01 ECU with HPTUNERS and have never had any issue making boost on the transbrake. I basically have the (pre-boost) timing the same way it was when it was a 12 second NA car. I never changed it, or had to add or take away fuel. My son's car always had an issue building boost with his TerminatorX'ed 4.8/Turbo 400 car, until he had a custom converter made by PTC. Mine 6.0/4L80 car has a Jake's triple disc that "stalls" at 3000ish footbraking, or as high as 4300 or so on the transbrake.
FWIW, mine ran its best 60 foot (1.37) at 7# and 3200 rpm, which is lower boost and rpm than my son's Fox body, which went a 1.32 so far...
Both "bests" captured below.
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Ah okay, that makes more sense, I'll try adding more rpm before doing anything else.
I'm not sure where my timing is at in those lower rpm ranges as Pat G is tuning my car, but I'd like to learn where and how to make small adjustments at the track.
If I could be running where you're at on pump 91 I would be absolutely ecstatic.
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Two Step for Boost Check? 
