Been doing some research on ECU/computer upgrades.
and i have a question.

Why do people use a Boost controller like the GreddyBspec with their Reprogramed ECU like
M2 and Pettite??

Reason I ask is, if your ecu is already preprogramed for fuelmap and boost psi already, WHy get a boost controller like Greddy?? If you boost higher than the preprogram, the ECU wouldn't be able to support it right?? and Kaboom, no more apex seals.
I doubt anyone gets boost controllers to bring the boost down, if you did why not just let up off the gas???

What am I missing???

Whats the purpose for a reprogrammed ECU with a BOost controller...

Thanks

 

New ECU allows you to go up to 15 psi depending on the ECU and mods so give or take a little. But with no controller the car will not boost that high. it has the fuel enhancements to but won't unless there is a controller to tell it to.

 

exactly what jon boy said. THe ECU is probrammed to support 14 PSI, but it won't actully boost 14 PSI on its own. You ahve to have the BC to get the boost up.

People do buy boost controlers to turn DOWN their boost. When you get enough flow mods you automatically start boosting higher then stock. If you don't have the ECU yet you'll want to turn it back down to stock levels.

 

Is this correct?? So to push 14psi with a M2 stage 3 I just got I would have to use a boost controller? I have all the mods the ecu was programmed to support. Everything really except street port, or pulleys. Will a simple Home Depot boost controller work?

 

Reprogram ECU will allow you to run higher boost by removing or moving the boost cut to a higher level and changes the fuel/iginition map to support that boost. If you run a full exhaust most likely you will see boost spike during the transition and boost creep at the top end. You get the boost controller to set to your desire boost level, I.E. 10psi, 12 psi 14.5 psi. The boost controller will hold that boost, it will stop boost spike/creep as much as it can, boost can be controlled but it is limited by your wastegate.

 

It's not just the ECU, it's the fuel delivery in general.

With a reprogrammed ECU which would be setup for a max of 14.7 lbs of boost, you may not want to allow that to happen for various reasons:

* Still using stock size injectors
* Don't have an upgraded IC
etc...

The stock twin turbos (from what everyone says) are not that efficient at higher boost levels (like over 13lbs).

Basically, people use the boost controllers to stay within good operating range for the mods on their car and to keep from damaging anything.

 

I think the M2 stage 3 ECU is only tuned for 13psi.

 

Damn, I'll have to talk to fd3boost and see what he was running it at. Well even for 13 psi, will a manual boost controller work? I can't think of any reason why it wouldn't but you guys tell me.

 

A manual BC will work fine for that.

 

OK OK hold on.

NOw I am getting kinda confused..

So the Reprogrammed ECU's like M2 and Pettite.
only remaps the FUEL and Timing ONLY???
HMMMM I thought they increased the boost levels.
But I guesss NOT..
SO those ECUS only make your cars capable of boosting up to 14psi.. Hmm I seee..
OK if thats the case, How do these cars boost up to 14psi when they have only the ECU and no controller???

What about the POWER FC?? does it control boost?

 

What cars are boosting 14lbs with only an ECU as an upgrade? They at least need to open up the exhaust and intake to make that happen (and run on a cool/cold day).

As for the Power FC, I don't have one, but I hear it can control boost and other things as well. Personally, I've seen too many people have problems with the PFC or blow engines with them. I rarely see people with M2's or Pettit reprogrammed ECU's saying "well, I just blew my apex seals".

 

The main reason I went with an ecu upgrade(pettit) is I basically did'nt trust myself tinkering with a
stand alone unit when they were first becoming popular.I might be on my 2nd engine by now trying to
extract every possible horsepower by playing with it.I also live a long way from any of the good tuners.
I have had the unit over 3 years and have no problems even running 13.5-14lbs,boost only on the dragstrip w/unleaded race gas.I run stock eng.
turbos,injectors but do have just about every upgrade bolt on inc.fuel pump.If your looking for simple
tuning the the upgraded ecu still works fine.Save yourself some trouble and just go right to the electronic boost controller as it's more stable and controls spiking better.
Also how much faster(w/stock twins)would a stand alone unit make me as my trap speeds now are 116
now ???

 

If you run 17-19 psi you can hit 120-121 mph. Yes I know it's past it's efficiency range...etc..etc...

 

while reading through threads iv noticed spiking is metioned quite a couple times, so what exactly does it mean? why is spiking caused and how does having a bc help control it?

 

There are two kinds: Manual and Electronic

Both can help, but in different ways. For the manual, you are adjusting an orifice for the exposing the vacuum/air controlled solenoids. Electronic is a much better solution as you are replacing the stock boost control with a "smarter" (faster acting) control unit. This also helps turbo response.

 

I beg to differ. I doubt that any electronic boost controller works as quickly as the laws of physics on a ball and spring. You just cant use home depot quality valves.

1st edit
Heres why I think that.
manual boost conrtoller opens based on physics at the set pressure level

electronic boost controllers go through a process. Is it 15psi yet? It is 15psi! Open the solenoid! Solenoid open!

If there is an "electronic lag" it would be imminiscule. But regardless, that is why I dont think it is physically possible for EBC's to work faster than MBC's.

2nd edit
I am not trying to say that EBC's do not work "better". I bet they do. I want one but so far only have MBC experience. I plan on writing up whatever unit I get when I get it. Im eyeballing those blitz sbc's. they nice.

 

I know more than one person that noticed more "pep" when switching to an EBC. While it's all perception, these are people who tested all the various setups over the years.

If the stock solenoids are still in place, you are still limited by their technology; that's were EBC's have the edge.

 

ah, thankyou