LTProject

Hey 2 quick questions, how or where do you go to find out when the secondaries turn on? Also where some of you guys like to have them turning on at. Could i also get some ideas on the throttle pump, like settings at 1000 vs 3000. Ive been adjusting it and id just like to know if im in the correct direction.

thanks
mike

RETed

The staging bar dictates when the secondaries turn on - this is dependent on MAP pressure only, when in Load = MAP mode.


-Ted

LTProject

thanks reted, what does the stagging bar look like. i see this dotted line going top to bottom on the fuel map is this the staging line?

SnowmanSteiner

yup, that line is where the secondary injectors come on, when you first hit boost.

- Steiner

LTProject

were do you guys normally like to see that line. ie: 0vac or 1 psi ect.

RETed

On boosted applications, I like to get away from the 0 point a much as possible.  The 0 load point is a weird transition point for the engine, and it's hard to get tuning done with the staging bar there.  I like to keep it at least 2 bars away; I keep mines at bar 14, and I think the 0 bar is bar 11.  The Haltech manual even recommends this.


-Ted

SnowmanSteiner

How big of primaries are you guys running if you push the transition line back? Only reason I ask is because I would be concerned, I would want to make sure that my primaries can handle the load under some amount of boost.

- Steiner

LTProject

im using 550 and 1600. i had moved the bar to 11 (previosly at 8 per hitmans map) and i could barely move it. im thinking i turned the injectors down so much before that its falling on its face. tonight ill raise the m/s and move the staging bar the right. thanks guys for the help.


kind regards
mike

j9fd3s

iTrader: (3)

i'm running the staging bar 2 bars from 0 to the vacuum side, it somewhat depends on the turbos responsiveness though, at cruise i can get 0psi very easy, with a bigger turbo it wouldnt be an issue. i'm running the stock 550's too

RETed

550 primary, 1600 secondary
staging bar at 14


-Ted

LTProject

I dont have the turbo plumbed in yet so ive been messing with it at 0 load. i guess i shouldnt get to concerned until the turbo is plumbed in. my setup is: 81 rx7 S5 ported 3mm ceramic, haltech, 550 and 1600, sumped tank, caged, 4.88 rearend, car stripped of interior, front mount, and the grand daddy T72 with turbonetics Q trim a/r 96. This should be one bad *** 1st gen. Ill keep you guys posted and again thanks for the advise.

SnowmanSteiner

all right now I have a couple questions about this. For the guys running the secondaries in the vacuum area, before 0 vac, do you see increase responsiveness? Or do you load up on fuel at all? And for the guys runnin post 0 vac what are you reasons for delaying it further? Is it just pointless to have the secondaries come on at 0 vac because you don't really need the fuel there or what. This brings up something I might try, as my problem is as soon as I hit a little over 0 vac I get what feels like ignition or fuel cut. I'm going to try and get new injector connectors, and if that doesn't fix it I may move the line pre or post 0 vac to see if it is the injectors that is causing the problem, or if it is possibly something in the computer that is doing it. One thing that I noticed now, is that under settings it always defaults to a 1 bar map, sensor where I have a 3 bar. I don't know if this is part of the problem or not. But everytime I go in and change it, as soon as I go to another area and come back it is set again at 1. This is all without it hooked up to the haltech. Ideas are welcome. Thanks.

- Steiner

RETed

My reasons...

It's easier to tune the vacuum (up to 0) ranges a lot easier.  I concentrate on tuning fuel without having to worry about the transistion.  If you have the staging in the vacuum ranges, not only are you adjusting fuel bars, but you need to worry about the transition staging bar also.  The engine will stay in these ranges a lot more than the boost ranges, unless we're talking about a race car.  Concentrating on tuning these ranges will reward you with a better running street vehicle.

Make sure you don't past the max pulsewidth for the top RPM's.  I believe at 7kRPM, try not to go over 7.0ms.  So far, I've kept the pulsewidth under the recommended max even with the staging bar that far into the boost range.

Boost ranges are not as sensative to being a little off tune (i.e. rich) than the vacuum ranges.  I tend to tune on the rich side anyways, as most of my customers are street driven vehicles.  It's a lot easier to be sloppier on the boost tuning than in the vacuum tuning.  Running rich in the vacuum regions significantly kills gas mileage, whicle being rich in the boost regions you probably won't notice any significant difference - you'll see it pop up on a dyno though.



-Ted

LTProject

Like ted said, i was having a hell of a time tuning until i moved my staging bar to the postive range. it was loading up and falling on its face. my two cents.

mike

j9fd3s

iTrader: (3)

for what its worth the fd stages at 1psi, or 3200rpm. the 3200rpm is due to the slow stock computer and the fast turbos, with a faster ecu (e6k etc) and a slower turbo (ns twins, or a single) its not needed