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BMW 3-Series (E90 E92) Forum
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Turbo Tuner or Stage 2 JuiceBox
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12-04-2007, 02:38 PM | #45 |
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thanks for the info, but is that even but dyno felt. rather stick with the R as a upgrade and not push anything.
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12-04-2007, 02:41 PM | #46 |
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12-04-2007, 02:42 PM | #47 |
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Funny it used to be that everyone was all over the Procede. It sure has lost its steam. My 1.47 is off the car and I'm still waiting for v2. Should I sell for a JB2 or SSTT?
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12-04-2007, 02:44 PM | #48 |
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i think u will miss the power and the adjustability. PROcede has a pretty good reputation with the products aswell. some rough edges and customer service issues which have taken care of tho but still good.
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12-04-2007, 02:45 PM | #49 | |
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(I know you were joking by the way, but had to say something) |
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12-04-2007, 02:51 PM | #50 | |
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Conversely with a piggyback I think BMW would have a much easier time proving that messing with the car's main wiring harness led to the same hypothetical ABS failure. By violating that harness (regardless of which piggyback you attach) you subject every mechanical and electrical system on this car to the risk of a warranty problem. While you may or may not win that battle with BMW, is it worth the risk for MAYBE a fraction of a second on a 1/4 mile or the $250 difference? My personal answer was no. Ponder this...if the SSTT is only making more power by tricking the ECU into doing what it otherwise would do given certain conditions, how can the dealer possibly know that it happened? So long as the SSTT does not go past the point of the car's built-in ability, what's the problem from a warranty perspective?
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12-04-2007, 02:53 PM | #51 |
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12-04-2007, 02:55 PM | #52 | |
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If done properly the dealer can't detect it, but that doesn't change the reality of what is happening. You are raising the boost above the factory level for more power. |
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12-04-2007, 02:59 PM | #53 |
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Not joking at all ...I am reaching the end due to frustration and tech concerns. People that know more than me are jumping ship - so am I in the shitter missing the fact that the ship is sinking around me?
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12-04-2007, 03:05 PM | #54 | |
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Off-topic I know, sorry guys..... |
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12-04-2007, 04:45 PM | #55 |
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JB2 controls fuel, SSTT doesn't. JB2 with no knock retard FTW.
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12-04-2007, 06:20 PM | #58 | |
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12-04-2007, 06:22 PM | #59 | |
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12-04-2007, 06:52 PM | #61 |
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12-04-2007, 07:03 PM | #62 |
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12-04-2007, 07:08 PM | #63 |
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12-04-2007, 07:28 PM | #64 | |
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The MAP sensor after the throttle valve measures the actual pressure in the intake manifold. That actual pressure is determined, in part, by how much boost there is. So the TMAP is tricked to raise boost, which increase is seen by the MAP sensor in the form of increased actual manifold pressure. If the MAP is expecting to see 8 psi, but sees 11, or 12, or 15, and there is no modification to the signal coming from the MAP sensor, shouldn't that trip a code? Or does the ECU presume, up to a point, that the difference is caused by environmental variables? Assume for a moment that you take a car that is at sea level. The turbo makes 8 psi of boost. The MAP sensor sees "x" value of actual manifold pressure. The ECU recognizes that as a correct value. Now, turn the boost up to 11 psi while still at sea level by tricking the TMAP. You would agree that the MAP would read a higher amount of actual pressure because there would, in fact be more pressure. Right? So the ECU thinks it is sending 8 psi, and the MAP is seeing 11 psi worth of actual pressure. How does the ECU account for that difference if the MAP sensor signal is not altered?
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12-04-2007, 07:37 PM | #65 | |
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The way this actually works is simpler than you think. You just reduce the signal going in to the tmap sensor, which tricks the ECU in to giving more boost. If at any point the ECU determines you are running more boost than is registering on the sensor (e.g. solenoid duty cycle), it throws a limp and "turns you in". So its very important to not get those limp codes under boost as you can't clear them yourself. Of course the JB also works the o2 sensors for more fuel, which makes the tune much better than say only adjusting the tmap, but that is another thread all together. |
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12-04-2007, 08:02 PM | #66 | |
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The MAP tolerates a differential of .3 bar, which is about 4.2 psi. Above that, the BOV's open and bleed boost. Doesn't that suggest that BMW anticipated the car running, under certain conditions, at up to 12.2 psi?
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