2.0 8V Turbo Dyno Results

[stuart1298 6]

Right, after last months dyno of 97bhp I tracked down I had a missing nox sensor, So took it down there today, and hit 164.8 so little bit of an improvement but its still over fuelling, air filter is getting plenty of air, new nox sensor, which Is working, genuine pug temp sensor, but I hit boost at 4250 rpm my air to fuel ratio drops to 10.5:1 (which is as low as it measures) and power drops to 150 bhp

[welshpug 1,626]

so what did it make today? the standard 150 or 164?

[Tom Fenton 1,526]

Am I reading right that it doesn't make boost till 4250rpm?

[stuart1298 6]

sorry, i maybe reading it wrong, i will upload the results

[stuart1298 6]

[stuart1298 6]

should mean more to you guys

[Miles 331 1 Cars]

Any plot of the torque?

 

But if it's a std engine, Power is kept well as they don;t normally as it's all out of puff by 6000

[stuart1298 6]

thats the fueling and bhp sheet, the torque is on another print out, but battery has died on my phone, so cant upload the other pics now,

the only mods to the engine are exhaust system, induction kit and front mount intercooler, nothing else has been up rated

[Anthony 1,000]

My memory is a bit hazy, but isn't the rev limit on a 2.0 Turbo engine well before 7000rpm as suggested by that printout?

 

If the RR isn't measuring rpm properly then that throws any figures out of the window, given that rpm is an integral part of the power-torque calculation.

[dcc 855]

dont they assume youre running with as close to a 1:1 gear ratio to estimate rpm? so depends on what gear your in ? also thats running very rich. what ecu is it? what injectors?

 

and what fuel pressure

[stuart1298 6]

They were running it in 3rd. Standard ECU, injectors and pressure regulator, might get a new regulator in it if I can't find some one with a tool to messaure it

[sounds of silence 2]

looks more like a management fault like a cts or such like and went into a default and just over fueling , but again the rpm on the graph doesnt look correct

[stuart1298 6]

Just had a genuine cts fitted, so should be ok

[sounds of silence 2]

Was only using the cts as am example mate i would be looking for a sensor fault tho

[stuart1298 6]

And idea what other sensors. It's had brand new, crank, lambda, nox, ect sensors

[welshpug 1,626]

so what's actually wrong?

[wicked 103 3 Cars]

Don't drive at max with this afr; you'll get bore wash and your piston rings will wear out fast and polish the 'liner'.

With how much boost do you (intend to) drive?

 

I expect a failing fuel pressure regulator; normally you can check it if you take off the return fuel line and see if it returns fuel to the tank, but would not advise to do that on a RR with hot engine.

[ross009 0]

post edited for being completely in accurate due to me not paying attention

Edited November 17, 2011 by ross009

[stuart1298 6]

I'm running .8 bar will get a fuel pressure tegulator

[Tom Fenton 1,526]

Your not rich your lean very lean!! at max power 164 bhp which you hit at 4250 rpm your afr is 15:1 this is WAY to high even then when you drop off the power your afr's are still way to high at WOT at full boost you want to be seeing in the high 12's on afr iw ould say your not getting enough fuel pressure or injector problem?

 

What graph are you looking at?

 

The one I'm looking at shows afr at 13:1 to 12.5:1 which is ideal, until it then plummets to 10:1 which is too rich.

 

Not sure where you have got 15:1 from?

[ross009 0]

ha ha ive read that like a retard completely ignore my post sorry!

[stuart1298 6]

I was wondering of the pipe that comes from the throttle valve to the pressure regulator might be blowing the regulator shut at high boost rather than allowing it to open, I no its working fine at low boost as you can see it doesn't over fuel till boost kicks in, I'm new to turbo'd cars, this is

My first, so all a learning experience to me

[ross009 0]

i think it should have a one way valve in it mate my only experience 1st hand is renault 5 turbos but a vacum line to the fpr will go + pressure and could defo do weird stuff

[welshpug 1,626]

there's no additional valve for the FPR, when when it sees vacuum it'll drop the pressure, I don't think it will raise it past 3 bar at all but possible it is.

 

easy t check, hook up a pressure gauge, must be for Injection as a carb gauge will not last due to the pressure.

[stuart1298 6]

Just seems strange it's only when the car hits boost