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The mkiv Supra Owners Club

strange button


piehound

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ok peeps as or as you may not know, when i bought my soop it had a button under the dash that was said to take it to over 400bhp(it still had cats in) even though i pushed it and nothing happened

when the thing blew its big ends and went and had a full rebuild the guy doing it rang me to tell me " hey mate its got a sticker on the ecu saying chipped by turbo someone or other but theres an earth off the feed to it"

he connected it anyhooss now the car is all ran in i pushed the button and fook me it goes supersonic the first turbo spools super quick to almost 1 bar and the second spools even sooner and faster i backed off at 1.2 bar, what is this button doing to my ecu ? to make the turbos spool sooner and higher, i cant get my head round it as i thought all the turbo components where mechanical not electrical, i dont need to use this button as without i get normal boost and it goes great, oh its got no cats now either before i get told off and no sign of fuel cut, cud this have been sorted by the chip too

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the turbos are not running in paralell (cant spell that) they are running as they should just more boost, the work was done by collins in congleton i emailed them but they didnt have any answers i didnt want to tell me without spending money

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it could be a scramble button. some boost controllers, like the Apexi AVC-R i used to have, have an optional wire that allows you to temporarily raise the boost to a higher setting than normal (a bit like when Michael Knight presses his boost button ;) ) but, i'm pretty sure that the button was just a single wire going into the AVC-R and didn't have an earth too

 

1) have you got a boost controller?

2) does the boost stay at this higher setting permanently until the engine is switched off or does it only last a certain amount of time, i.e. 30 secs

3) is it just the boost that is raised when the button is pressed, i.e. can you measure the differences on your boost gauge with & without pressing the button?

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