For all you guys that utilize high boost and low boost during a single run

[1998gstspyder]

I know there are some fwd people here that switch from low boost to high boost. They use low boost for off the line and in 1st, and maybe around 2nd switch to high boost.

I want to do this for my car, but I'm confused about one thing. Isn't there different fuel maps/afc corrections/etc at different boost levels? Basically each one has a different tune, so how would someone just switch to high boost with a push of a button without changing their safc or whatever they have????

If you do something like this, please respond, and let me know what psi you use for high/low and also what ebc... Thanks

Just for the record, car is 98 gst spyder with evo 3 16g, dejon tool intake, cone air filter, mbc (soon to be dual setting ebc), extreme intercoolers fmic street/strip kit, 660cc injectors, 190lph fuel pump (so cant get 255), safc2, evo3 o2 ported housing, 2g intake manifold ported, apexi 3 inch turboback (no cats), act 2100/12 lbs flywheel. i got egt/boost guage/a/f guage, palm m130 with logging software.

 

[GVR4592]

The mass airflow sensor will recognize the increase in airflow and the ecu will compensate accordingly. There might be some small changes in A/F that you would have to make compromises on, but nothing major.

 

[1998gstspyder]

The mass airflow sensor will recognize the increase in airflow and the ecu will compensate accordingly. There might be some small changes in A/F that you would have to make compromises on, but nothing major.

im speaking like from 15psi to like 20-21 psi? I would be okay without a retune?

 

[1998gstspyder]

is there anyone that is actually doing this during thier races than can chime in?

 

[wt71gas]

Set your tune as best you can for the higher boost settings. I have a fwd as well as an awd and I use a simple two stage MBC for the fwd. I run stock boost 1-2 gears and hit the switch so its full boost for third gear. You probably lose a little power on the tune for the lower boost but thats why you run the two stage boost controller so that you can lose some power to get some traction in the lower gears. I just run a simple two stage mbc from dejon btw.

 

[1998gstspyder]

Set your tune as best you can for the higher boost settings. I have a fwd as well as an awd and I use a simple two stage MBC for the fwd. I run stock boost 1-2 gears and hit the switch so its full boost for third gear. You probably lose a little power on the tune for the lower boost but thats why you run the two stage boost controller so that you can lose some power to get some traction in the lower gears. I just run a simple two stage mbc from dejon btw.

nice thank you. thats just what i have to do i guess. where did you place the button and is it easy to toggle between the high and the low while driving

 

[wt71gas]

I have it on the front dash piece with high boost in the down position. That way I can just swipe at that general area between shifts and its easy for me.

 

[daren_p]

Like Luke said, the MAF will measure this increase/decrease in airflow & the ecu will compensate for this. Now your tune may not be dead on but I've run from around 12 psi to 20 or so psi all on the same tune (when was running Greddy Profec Type S EBC) & there wasn't enough difference in the tune for me to notice anything in perticular. Your air/fuel ratio may change like a couple tenths or something, but were not talking anything major like say going from 11 to 1, to 10 to 1..

The best solution would be to get that LSD on your wish list & make sure to run a nice sticky set of tires, they you won't have to worry about running different levels of boost

 

[Littlebeeper]

or you can do the poor mans method. don't floor it out the gate and learn how much gas to give it in the 1st two gears while it starts to build boost. works for me............but it took quite a few runs to see the 10ths begin to drop

 

[wt71gas]

Like Luke said, the MAF will measure this increase/decrease in airflow & the ecu will compensate for this. Now your tune may not be dead on but I've run from around 12 psi to 20 or so psi all on the same tune (when was running Greddy Profec Type S EBC) & there wasn't enough difference in the tune for me to notice anything in perticular. Your air/fuel ratio may change like a couple tenths or something, but were not talking anything major like say going from 11 to 1, to 10 to 1..

The best solution would be to get that LSD on your wish list & make sure to run a nice sticky set of tires, they you won't have to worry about running different levels of boost

AGREED!

 

[thekellbeast]

Here's mine. It's the Dejon high/low boost setup, with a switch I got from VIP since the one in the kit was fugly for an interior piece. maybe it would have looked good in a racecar on a metal panel, but not in a DD's interior. Anyways, here ya go.

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[1998gstspyder]

nice thanks guys...LSD would be nice, but it would be way down the line when i have taken care of most of my debt, i CANNOT go any deeper..hell if im making some good money, ill just buy a old gsx and swap the parts...

 

[v8killar]

i too run a dejon tool dual stage mbc. i went to the junkyard and pulled a OEM hazard swith, and rigged that up in the blank spot under my normal hazard light switch. i run 11 pounds in first and then switch over to high boost which is 14-15 in second. works great.

 

[nicknorth11]

I did the same thing as v8killar. (You can find some threads about how I did this by searching my past posts).

I don't want to jack this thread, too bad, but I have problems when switching from low to high while in gear. (The boost doesn't go all the way up to 21 psi, which is my high setting). Do you guys have the same problem?