Toymods Car Club Inc: Tech & Conversions => How does the 7m-gte boost retard ??

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SUPRAGTE
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May 2002

Re: How does the 7m-gte boost retard ??	Thu, 28 November 2002 12:19

Inferno- i'm definitely certain it doesn't use the knock sensors when up into the load range on the 3tgte. It doesn't only "kick in" when up near full load either as you say from the knock pressure switch. I've haven't heard of a knock pressure sensor either. You can have pressure sensor's and knock sensors but not combined. They are totally separate, one measures ultra-sonic waves with a piezo ceramic material and a pressure switch just makes or breaks a contact at a ceretain positive pressure. As i say, there's not an engine out there yet that does use it when under load that i know of yet. They all use pre-determined lookup tables from eeprom's when on load that's why aftermarket computers are so good when doing mods to improve airflow, power etc from the engine. Cause the factory ecu doesn't realise when you put a massive intercooler on with 2.5 inch piping the lookup table stays the same as if it has a restrictive cooler for example. There are gains from bolting these straight on but even bigger gains when can throw in a heap of extra ignition timing to get the most out of your new bits. ED- The way these engineers at toyota and many other companies measure airflow and determine injector pulse widths and ignition timing just isn't dodgy. It came from F1 which puts millions into research in the quest for excellance and then the major car manufacturers do it all over again. AFM's are the most accurate within economical reasons. How else would you measure how much air is going into an engine??? It's got nothing to do with the BHG issues. When the guys run the GE high comp pistons on their GTE's?????? That sorta defeats the purpose. The lower the compression the better, for turbo engines anyway. That's why you'll see Rigolli's 7MGTE running lower comp JE pistons(8:1 lower than factory 8.4:1) not higher compression. The lower the compression the more boost you can throw in the more power you will get to a point. Now if you run higher comp pistons you can't run hardly any boost because of detonation occuring because of the higher combustion pressures. Running GE(think they are something like 9.5:1) pistons in a GTE would allow you to run like 5psi of boost and this defeats the purpose of a high performance turbo car. It would be nice and responsive off boost but the turbo on boost power is the whole reason you have a turbo car in the first place. As for if you did run GE pistons in a GTE you would should definitely run an aftermarket CPU for fuel and ignition timing cause you'll have to minus a swag of ignition timing off to stop the detonantion. The timing is where you get the most of the power. More advance = more power, its that easy. I advance my ignition maps while on a dyno by 5deg accross the entire map by whats called a "blanket map change" and netted 30rwhp extra at the top end and a very healthy increase all the way through. The CAS, crank angle sensor or cam angle sensor. They both simply telly you the position of the cylinder no 1 and its relation to TDC. From this the CPU can work out the posi of every other cylinder and at how much advance to fire them. Gianttomato- they wouldn't have the same amount of air off boost as each other as they have different compression ratios therefore different combustion chamber sizes therefore different amounts of fuel to go with different amounts of air in those combustion chambers. Humble- i dont have the exact figures on at which the ECU goes into cruise conditions. I'm pretty sure it is 0-25% TPS though, could be higher but you wouldn't really be cruising with up to 75% TPS. You would be more likely giveing it a kick in the pants. Yep it is coolant sensor activated, must be between i'd say 82-90deg C before it will allow this. Cause your engine is automatically enriched when the engine is cold(to make it run smoother) if it tried to go closed loop on the 02 sensor it would see A/F ratios too rich and lean it off and your back to where you started from. The pump is condition based. (Ie if at 6000RPM dont allow pump)Yes it does adjust the ignition timing, it advances it. My microtech setup adds 5deg when it sees my foot go down really quickly to give better response a feel. What a bloody huge post, i'm not even going to bother proof reading that, battery on the laptop is about to die!!! Quick submit!!! RPM activated [Updated on: Thu, 28 November 2002 12:22] [Report message to a moderator]

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