Dave Henshall

1.21 gigawats

could be surging... if its only a whapping big turbo thats been fittd with no attention to other things, the turbo coulbe be producing too much airlow than the engine can consume and causes it to stall/ surge,, common on cossies running big turbos that havn't been properly set up.

makes the cossie feel quite inadequte in comparison.... if you run more than a stage 1 chip you need new injectors, sensors, breathers, head gaskets, fuel pumps ect etc... my escos is going up for sale in the not too distant future - its things like that above that do make me feel much better about supras thanks homer

is this right,? ive just looked on the superchip site and it says upto 55 more hp in the midrange, its just a fcd?

so the UK spec TT with a THOR FCD will make more power (safely) than a import one.? is it common to melt pistons on supras, or is this only when someone who doesnt know what they are doing turn the boost up so far without the though of fuelling?

running that rich thuogh cant be good for the engine surely and it will be down on power compared to as near to running stoichiometically correct thought the revs/ boost range.... has anyone ever fitted an comlpete aftermarket ecu to a TT auto and have it properly mapped...? dont anyone take this the wrong way.. it just seems a bit 'cowboyish' compared to what im used to and haver a fair understanding of..... the uk TT has 550 cc injecotrs which must run unbelieveably rich if thats the case, but uit cant as otherwiese if it were that rich the cats would surely burn out with that much overfulling going on...?

bttt

cool,

so does the ecu have no way to limit boost if there is a probelm (limp mode equivilent) on an auto, is there a link to the auto box ecu to the engine ecu - is it a CAN type network?

i could show you the way in my cossie seriously though.. be carefull, i got a 12 month ban over there in 2002 for dangerouis driving in my evo 6, i was a full page in the macc and wilmslow express, and for what,, 71 in a 50. they just wanted to make an example of a young lad in a fast car. tossers - dont get me started

dont forget the japs a smaller and can fit under there standing up

does the TT have any form of factory electronic boost control.... or is the wastegate actuator directly connected to the compresser housing and it just relies on the spring pressure in the actuator to determie the boost level....?

am i right in thinking that the fuel cut defencers work like the pic ive drawn below... so that as the mas airflow increases so does the signal back to the ecu(whether its voltage current or frequency) so if you up the boost and the mass airlow is increas beyond the facotry setting then fuel cut occurs (like it did in my std evo and cossies) so by fitting a fcd you hold the signal to the ecu at a predefined level so that the ecu thinks its lower than it actually is. how does the ecu compensate the fuelling for this is thi is the case. i nkow its got a 02 sensor pre cat, but this will be for closed loop fuelling and normal cruise and idle, not WOT at high boost- cos if it failed it could v quickly do a lot of damage , so the closed loop fuellingmust swicth off when at WOT and the ecu reverts to it load/rpm table and ajusts the injecotr duty cycles accordingly.... how can this happen if the ecu isnt aware of the increased airflow/boost? is there a map sensor aswell as a maf sensor on them. cos the only real way round this on other turbo cars ive owned it to fit new chip and map sensor so that the ecu IS aware of the actual boost levels, or new ecu with revised software that can accept the increased signal form the airflow meter.... help please... whats different to supras, why dont they run lean and melt the pistons when you run more boost than the ecu can see and therefore control the fuellnig for....?

get a pic up

the front and back wheels look like a different style...? and is it the pic or is there large curb mark on teh back wheel, near the top?

i'm talking forced induction though... with similar engine sizes and speeds,, the honda revvs very high to get the amount of air in to produce the power doesn't it...?

come on - show a pic of it...

does it mean to pull the door shut, "pull here" as opposed to pulling some flimsy plastic bit that might break off...?

but each cylinder is 500cc on both cars... its just i only realised that more cylinder make more power, not just the fact that its more capacity

i was bord today so i did a bit of maths... a good stage 1 , 2.0 cossie 4pot engine running 1 bar of boost will make 270hp. so 270/(4*1)=67.5 hp per pot, and i wonderdd why the supras made much more power with only 0.8 bar of boost as std.. then reliased they are 6 cylinders.. re work the above and put the supra numbers in... 67.5*(6*0.8)=324 hp almost exactly what the TT is as std ... i know this is simple stuff, but int maths brilliant

low loader only then -

im very intersted in this - would make the differnce from buying a early std UK to a heavilly modded late import

ive read the article on the greddy fuel cut defenser.... it does axactly what i thought - which is ok - BUT my question is HOW does the ecu keep the AFR correct when the engine is working hard ' on boost' when its only fuellng for 0.8 bar boost say... i know its got closed loop fuelling with the o2 sensor BUT surely that is only a narrow band sensor for keeping the ARF right when at idle or on cruise - when at WOT conditions, surely the ecu needs more inputs than a fixed (simulated) airflow voltage? do they have a MAP sensor aswell as a MAF sensor?

thannks guys. ill be mostly trawling through the tech senction today

thanks homer, are there not companies the do remapped ecus though, not a chip in the cossie sense but a whole new processor/map setup that is soldered onto the board ? so what is involved with BPU, decat, pipe, air filter and turn the boost up ? ive read a bit on fuel cut defencers, now forgive my ignorance, but are these the same type as they used to be ? ie you fit it inbetween the aif flow meter and the ecu and it changes the signal from the airflow meter when running more boost to tell the ecu it isnt to stop it fuel cutting..? if so, 1 glaring question here coming from evos and cossies, if the ecu 'thinks' its not getting as much air ,it wont fuel accordingly and surely yuo will run dangerously lean.... or do the new ones also enrichen the fueling external to the ecu aswell - linked to the new airflow signal?