jezzaG60

Wideband and narrow band sensors are not interchangable in any way. Nothing to stop you having 2 narrow band sensors.... 1 on the ecu and 1 for the air-fuel guage. Only way to really do it tho is to buy a wideband unit.... but they aint cheap!

Standard chip you say? Are you running the stock pulley on the charger too? Either way with the mods you have i would imagine your flowing a fair bit more air which in turn is gonna need more fuel. I'd say you want to get it on the rollers with a gas analyser and see what the mixture is up to.... then get one of those nice SNS chips. Alternatively get one of those Air fuel guages which hooks onto your existing Lambda... they are far from ideal but they will at least give you some idea of when your car is running rich or lean.... i know back when i hooked one of these up it helped me find many little gremlins including bad earths, a broken ide switch and gave me a worrying look at the imfamous "dighifant delay"!

OH yeah, sorry, didn't notice the scaling differences.... that will teach me to post replies at midnight! Al my dyno plots are on the same scale which makes things easier to compare. I still think its slightly odd that there is such a big difference in "flywheel" hp and only a small measured wheel difference. That said... correction factors for the dyno include many things.... ambient temperature, hunidity and air pressure. These are combined to give the "corrected" bhp. One other thing to note.... we always keep a note of the tyre pressures.... it helps to produce dyno plots which can be compared... i'm always surprised by the difference 5psi in the tyres can make. Anyway, thats enough of my rant about dyno plots.... it does seem that your car is progressively loosing a bit of power so there probably is a problem somewhere. Do they have a gas analyser or Wideband O2 hooked up during the runs.... would be nice to know what the fueling is doing.

hmmmm, 33bhp lost in the tyres..... thats 24kW...... i think thats more than enough energy to melt your tyres... Seriously though... as a rolling road owner i would say only compare power at the wheels... either that or get it on an engine dyno!

Looks like you have some VERY dodgy dyno plots there mate, i'm guessing there is probably nothing wrong with your car. 1. Always look at the figures quoted "at the wheels". These are what the dyno actually measures. Flywheel figues are usually a bit of a dodgy guess.... as a rule tho Bosch say transmission losses for a FWD car will be about 15% 2. Torque and BHP curves should cross eachother at 5250 rpm.... its a fact. The crossover point of 5250rpm tells us: horsepower = ft.lbs * rpm / 5250. (When rpm = 5250: "rpm / 5250" equals 1, so it reduces to "hp = ft-lbs") If they don't you need to start questioning why! Looking at your wheel figures there is actually very little difference... about 130hp at the wheels.... that said though for the mods you have their doesn't seem to be the power you would expect.......