Grainger valve with a 3 bar cal

[Marcus86GLHS]

a lot of us run a GV with our 2 bar cals, either the stock cals or the ones from MP. work great. but, the 2 bar cals can only allow a limited time above 14.7 psi, then, LM goes into "overboost cutout".

the gv does not effect the boost signal the MAP sensor sees; the gv only effects the amount of boost signal the wastegate can sees.

ok here's the question/idea:

if you have a 3 bar cal, that can control fuel/timing/etc up to about 29 psi, couldnt one still use a gv to control boost onset rate? the 3 bar cal would still be seeing the actual manifold pressure (boost) and so would still be controlling fuel/spark/etc, but by also using the gv, one can dial in a prefered rate of boost onset, just like we are doing with any 2 bar cal.....only difference being that if the gv is set for a psi at or below the cal's upper control limit then we can get unlimited time-at-boost (ie: no overboost cutout).

is anyone using a gv and a 3 bar cal?
or, what's wrong with my thinking here.............

[moparzrule]

3 bar cal's work the same as 2 bar cal's, only difference is how high it can read. Your thinking is correct. I run a G valve on my 3 bar cal, it's the only way to go for fastest spool-up possible.

[Marcus86GLHS]

whew! and i thought i was nuts for thinking this way......

i like the setup on your 87 'tona....and HP or ET numbers?

[minimopar]

I run a grainger on my 3bar cal. Just keep in mind that the higher you go the more "off the factory scale" you are getting. Depending who does your cal, they need to be aware of how high you intend to go.

[Marcus86GLHS]

good point. i was thinking of setting the gv to have the ball off the seat at the same psi as the new cal was set at for max boost.....this gives me a better spool rate, and, allows the cal to give me unlimited time-at-boost.

[turbovanman]

I had Paul set my low boost for 16 psi and race cal for 25 psi. I dont' want to hook up the switch and if I leave it in low, I get no cruise so I run the MBC, then I can play with how much boost I want!

[Una]

Quote:

Originally Posted by turbovanman I had Paul set my low boost for 16 psi and race cal for 25 psi. I dont' want to hook up the switch and if I leave it in low, I get no cruise so I run the MBC, then I can play with how much boost I want!

Paul needs to look into the code some more, the cal that I'm running, posted for the public in the D-Cal list by Rob Loyd allows me to select the polarity of the high/low boost switch. So if I were still using the factory cruise, it'd be happy. Crazier than that, the cal Rob posted lets me use the factory cruise switch for high/low boost. Cruise switch in the on position would obviously be low boost, turn it off and you get high boost.. heheh, awesome idea there..
Not to bash TU, I understand Paul has to be able to do it to ALL the different computers, and the cal Rob posted is a SMEC only one. It might not even be possible for a LM or SBEC computer to do it, and that's why Paul doesn't offer it.

[Shel-Game]

Quote:

Originally Posted by Una Not to bash TU, I understand Paul has to be able to do it to ALL the different computers, and the cal Rob posted is a SMEC only one. It might not even be possible for a LM or SBEC computer to do it, and that's why Paul doesn't offer it.

Paul's on the D-Cal list. I'm sure he's seen it. He probably just has a different way of doing it. More than one way to skin a cat as they say.

As for the T1/T4 SBEC, the boost control code is nearly the same as the '89 T1. I already modified the boost control routine to allow for switchable boost the same way it works in the '89. I'll post it once I get all the MAP related tables/constants/etc ID'd for a 3-bar setup.

I think it would be a bit harder to add this mod to the LM setup. It's not something I plan to do myself.

-Rob

[Shel-Game]

Quote:

Originally Posted by Una Crazier than that, the cal Rob posted lets me use the factory cruise switch for high/low boost. Cruise switch in the on position would obviously be low boost, turn it off and you get high boost.. heheh, awesome idea there..

Actually, if you think about it, it probably wouldn't be a good idea to run high boost while the cruise is on anyway. I know Jon Berube (not sure if he's on TD.com or not) ran it that way. He said his van kind of took off when the cruise control called for more throttle (and it got a ton of boost). Could make for a wild ride...

[Una]

Quote:

Originally Posted by Shel-Game Actually, if you think about it, it probably wouldn't be a good idea to run high boost while the cruise is on anyway. I know Jon Berube (not sure if he's on TD.com or not) ran it that way. He said his van kind of took off when the cruise control called for more throttle (and it got a ton of boost). Could make for a wild ride...

Yes. That's the problem with TU's cals. The cruise ONLY WORKS IN HIGH BOOST MODE. Kind of a wild ride.. Hence the reason it's so nice to be able to switch the polarity in the custom cal I run. And if I wanted to just run stealth without a switch on the dash at all, I could use the cruise control switch.
Also, I think Paul has been too swamped with family matters and catching up on past orders to notice the new features in other people's cals..

[Shel-Game]

I'm glad it's working well for you. I can't remember - did you have rich cold idle issues also? How did you fix it?

[My96z]

I had Paul st mine up for no cut out, I want to be able to control things myself and raise the boost as I see fit maybe I will rig up my own 2 stage controller here soon

I dont see myself getting to 29 PSI anytime soon... till I get a aftermarket rail anyways...

Jeff

[Una]

Quote:

Originally Posted by Shel-Game I'm glad it's working well for you. I can't remember - did you have rich cold idle issues also? How did you fix it?

I assume your talking about the cal I downloaded, Rob's cal. Not the TU cal. As I couldn't fix anything in the TU cal if I wanted to. Anyways, no, the car doesn't seem to idle and richer than it is supposed to when it's cold. It doesn't stay cold for long.

[moparzrule]

You can't run a grainger with a 2 stage cal unless you also set up a selenoid and have a dual stage boost controller also which is just dumb and pointless to have a 2 stage cal then. I had paul do a re-cal and take out my dual stage and back to a single stage because I use a grainger.

[turbovanman]

Quote:

Originally Posted by moparzrule You can't run a grainger with a 2 stage cal unless you also set up a selenoid and have a dual stage boost controller also which is just dumb and pointless to have a 2 stage cal then. I had paul do a re-cal and take out my dual stage and back to a single stage because I use a grainger.

Why not unless I am misunderstanding?? I have mine set up for 16 psi pump and 17 and up 100 octane! I just use the MBC to put the boost where I want it, I don't need to run high boost on the street and I need 100 in the tank anyhow!