boost with gms1
i think the main reason he did it this way is because i just bought this car new in december and have 2,000 miles on it lol
oh ok, well i wouldnt drive it on a tune until its totally broken in. i havent had clutch slip at all that i know of. but everyone has diff results with their clutches. some slip easy, some dont slip up at 400whp for some reason
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Joined: 09-05-10
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From: Virginia
Yeah, well when I first got the GMS1 it was flyin'. Then I decided to put a CAI and hotside pipe on it and it went even faster, but since, it seems to have dropped off little by little. Maybe there's something, not exactly learndown, but something like it, that's limiting me.
Oh well, I have some parts in the trunk and after I throw them on and get a tune, I figure things will be lots better.
Oh well, I have some parts in the trunk and after I throw them on and get a tune, I figure things will be lots better.
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Joined: 02-18-08
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From: NA
My gauge pegs 23psi every time I am WOT cold weather, warm weather whatever. I'm thrown off by some of the numbers you guys are giving. If your not getting over 20psi with this kit I would strongly consider looking into the installation.
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Joined: 02-09-09
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From: Tejas
The GMS1 flash rescales the sensors so that they'll work. If you didn't flash it then the ECU would be misreading what the different reading sensors were telling it and throw codes and/or go limp.
More info about "learn-down":
"Learn Down" is a side effect of how the ECU is programmed to work. It has airload targets and it does its best to reach them (through the use of the throttle plate and turbo), and once it reaches it, it will stick to it. What some people were finding was that with bolt-ons, it allowed the engine to breathe easier, but all that ended up meaning was that the engine didn't need as much boost to hit the airload target and would stay at roughly the same power output.
With an aftermarket tune, these airload targets are raised to a point that the ECU cannot get to them, and in doing so, will call upon as much airflow as it can in its attempt to reach them (usually resulting in higher boost).
Will "Learn Down" ever be gone? Yes and no.
No, in the way that the ECU is programmed with airload targets means that no matter who tunes the car it will always have to have airload targets to try to reach. That's just how it thinks and understands.
Yes, in the fact that GMS1 and aftermarket tunes raise these airload targets to levels that the car may never reach, even with bolt-ons letting it breathe better (and so therefore power output will benefit from bolt-ons).
Hope this clears things up.
With an aftermarket tune, these airload targets are raised to a point that the ECU cannot get to them, and in doing so, will call upon as much airflow as it can in its attempt to reach them (usually resulting in higher boost).
Will "Learn Down" ever be gone? Yes and no.
No, in the way that the ECU is programmed with airload targets means that no matter who tunes the car it will always have to have airload targets to try to reach. That's just how it thinks and understands.
Yes, in the fact that GMS1 and aftermarket tunes raise these airload targets to levels that the car may never reach, even with bolt-ons letting it breathe better (and so therefore power output will benefit from bolt-ons).
Hope this clears things up.
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Joined: 02-09-09
Posts: 4,374
Likes: 5
From: Tejas
I didn't want to retype all the stuff I've already said. So if people are going to ask the same questions that have been asked before, I'll just repost what I answered. lol Call it lazy... I just call it leveraging past effort.
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Joined: 02-18-08
Posts: 252
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From: NA
Sorry when I said removes I meant raises to an unreachable level. The only reason I bring this up is everyone says in order to benefit from mods you need aftermarket tune. What I am gathering is the only thing limiting the GMS1 with aftermarket parts is that it is a more general tune than what you would get from aftermarket. You would not be limited due to having constricting learn-down settings merely by not being able to tune for specific mods. If I do not have this right help me out here.
Senior Member
Joined: 02-09-09
Posts: 4,374
Likes: 5
From: Tejas
Sorry when I said removes I meant raises to an unreachable level. The only reason I bring this up is everyone says in order to benefit from mods you need aftermarket tune. What I am gathering is the only thing limiting the GMS1 with aftermarket parts is that it is a more general tune than what you would get from aftermarket. You would not be limited due to having constricting learn-down settings merely by not being able to tune for specific mods. If I do not have this right help me out here.
There are still some mods that you may make that would best benefit aftermarket tuning though, such as turning off the cat code for a catless downpipe. Other things like adjusting the MAF tables for an intake would help with gas mileage, driveability, and even knock.
Being that the GMS1 tune was designed to be a street-legal catch-all tune, it was designed to be catted and for the MAF tables to be set at where the engineers best thought would benefit most users.
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