With the SCT flash, does the pcm adjust fuel acording to boost like the stock pcm does? Meaning, I dont need to change a map if I want to play with boost??
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401whp 419wtq on pump gas tuned by Jannetty Racing Enterprise
good thread..this should be stickied..the more info about the sct the better..i will be investing in one soon enough...
I didn't want to go into too much detail about how it works ect b/c it would be hard to follow and most would not read enough of it, or carefully enough to get all their questions answered. It's not practical to try to teach an electronic engine management course. The reality is most people are not willing to invest that much of their time into learning how to do something. Its kind of like playing guitar, I can't tell you how many people have approached me about "learning to play" but once you give one lesson and say, now go practice, the "learning to play" pretty much ends there. They want it to sound like you make it sound right away. Thats not how it works.
That's actually a good analogy for this. You will have to do research on your own to lean to do this properly. There is only so much someone can teach you about it. If they just "do it for you" well, you haven't learned much of anything. And there is nothing wrong with that, some people just want to pay someone to tune their car and I suggest they do that if that is all they are after. If you want to learn to do it yourself then don't expect it to be all fun, it's not, it can be frustrating not to mention risky to your engine to try new things.
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Every human being is ignorant, only on different subjects.
With the SCT flash, does the pcm adjust fuel acording to boost like the stock pcm does? Meaning, I dont need to change a map if I want to play with boost??
That gets tricky especially with Different turbos, the map is Boost and RPM referenced, which means every different combination can achieve a different boost level at different RPM depending, meaning mostly in the lower part of the RPM Scale.
If you do a tune at all different levels of boost on your combination with race fuel, you will be able to dial your boost down on pump fuel then up on Race gas with out changing maps, obviously keeping the Timing conservative in the lower boost regions.
This requires many hours of Tuning every different boost level, you basically building a Full Fuel map, Where most will pick a boost level, tune that line of the fuel and timing maps and say It's all Tuned Thank you.
That gets tricky especially with Different turbos, the map is Boost and RPM referenced, which means every different combination can achieve a different boost level at different RPM depending, meaning mostly in the lower part of the RPM Scale.
If you do a tune at all different levels of boost on your combination with race fuel, you will be able to dial your boost down on pump fuel then up on Race gas with out changing maps, obviously keeping the Timing conservative in the lower boost regions.
This requires many hours of Tuning every different boost level, you basically building a Full Fuel map, Where most will pick a boost level, tune that line of the fuel and timing maps and say It's all Tuned Thank you.
As long as you are within the sensors range this would be true. As Jannetty is indicating creating a complete fuel map is not very practical, the majority of the time we are looking at what the car does at WOT or one particular boost level 93 octane tune, and another tune for race fuel. You would have to make compromises on timing to be able to go between race fuel and pump gas without reflashing the PCM. I am a big supporter of PCM controlled boost so changing boost levels would require a reflash. Using outboard boost controllers eliminates about 60% of the tuning work.
The stock pcm is the most sophisticated EBC and Fuel Controller ever.
Not to mention RELIABLE. There hasn't been very many issues with PCMs on the SRT-4. When ever im in the tuning section it seems most of the posts are of Failed EBCs and FCs, or shotty wiring splices.
In my opinion the SCT PRP is the best bang for the buck, so long as you take your time to learn how to use the software and learn what the tables do(which I'm still doing since i just got it last Friday). There isn't any splicing in piggy backs or reworking vac lines for boost(though a stage 2 WGA seems like a good idea for the stock/modified stock turbo people) And there isnt any fear of over advancing the timing in an attempt to lean out the car. In a sense you can get a much safer and reliable tune if you know what your doing.
With this software you can essentially have a Bigger turbo, with bigger injectors that adjusts itself for ambient air temps, Barro, gas quality, the whole nine yards. Without having to get out of the car every day and adjust boost level, or map clamp voltage or so on.
However, it isnt for the faint at heart. You really need to have an understanding of how the car works and what sensors do what. What the pcm uses to adjust fuel trims/timing, and so on.
Bryan
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2005 - Flame Red SRT-4 317hp/367tq
P.M. Me for details on installs, maintenance, and repair work in the North Georgia Area.
Excellent write-up , OJCool . Its good to see that the you & some other prp guys are getting proficient at reprogramming the ECU . Hats off to the trail-blazers !
Ive had the dealer package for about 6 mo. & plan on going prp with my tax returns . My goal is a mild 3-bar setup that focuses on drivability .
Dispite having my first Xcal-2 unit go bad on me ( which was promptly replaced by dealer ) I am happy with my purchase , & thats with just a 93 & 104 octane flash on very basic mods .
-Tom
im runnin a very similar setup to yours what kinda numbers you puttin down and at what psi with the sct tune?
If your asking me , powertrain mods are intake , hardpipes , hks ssqv , gutted cat . Dont know numbers , havent had on dyno . Psi spikes at 19 or so , holds 14-15 depending on cars mood . scangauge shows little knock , wide-band shows 11.5 afr at its leanest .
I suspect the flashes dont like the removal of stock bov & its anti-surge qualities . gotta watch how quickly it spools up during part-throttle .
I also suspect the waste-gate duty-cycle on sct93 flash is bi-polar . according to datalog results , it goes from nothing to everything at as little as 25% throttle opening .
Excellent write-up , OJCool . Its good to see that the you & some other prp guys are getting proficient at reprogramming the ECU . Hats off to the trail-blazers !
Ive had the dealer package for about 6 mo. & plan on going prp with my tax returns . My goal is a mild 3-bar setup that focuses on drivability .
Dispite having my first Xcal-2 unit go bad on me ( which was promptly replaced by dealer ) I am happy with my purchase , & thats with just a 93 & 104 octane flash on very basic mods .
-Tom
Well apparently forum Admin does not think so b/c the put my screen name on some kind of list that prevents me from using it.
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GT3076R, return line, stage II injectors, 4" short Ram, 3" Turbo back, STS, SCT Flash PCM managment.
----This is Ojcool, my account was put on a no access list for defending myself and other SCT section Members in OT----
There is such a fine line between stupid and clever. SPINAL TAP
how do you get the Advantage III software to be able to do the tunes and load them onto the xcalII? Reason im asking is bc I have someone that is very knowledgeable when it comes to tuning but hasnt messed around with SCT software before so I was wanting to find out if I bought just the xcalII itself what would he need to be able to set up the tunes, thanks
how do you get the Advantage III software to be able to do the tunes and load them onto the xcalII? Reason im asking is bc I have someone that is very knowledgeable when it comes to tuning but hasnt messed around with SCT software before so I was wanting to find out if I bought just the xcalII itself what would he need to be able to set up the tunes, thanks
He either needs to purchase the Dealer software or you need to purchase a PRP.
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