first of all - the car only made 233bhp but it were only holding 12psi !!
After some investigation we put it down to wastegate creep as the boost only begins to drop at high rpm !!
they swapped (with no charge) my actuator which was a -2 with a -5 both are courtenay actuators.
I weren't happy with the power output - so we aimed to raise the boost, abviously we needed to know what the fuelling was like !! thats when I sh*t myself !! lmao .91 was the figure which is lean for a normally asperated car so raising the boost would have been stupid !!
We did check the turbo to see what boost pressure it created !! 18psi was it's max (standard KKK) so looks like she has seen better days.
So plans are to change injectors tp Z20 LET up the FPR to 4.2 bar, check fuel pump and wires !!
once I've done this back to courtenays and up the boost.
One impressive sign was the inlet air temp - the ambient temp was 22 degrees - and the inlet temp was 40 degrees, So I was very pleased with that.
Does anyone know how much a set of Z20 LET injectors are ????
We weren't lookin for power results - we just checked the turbo to see what the maximum boost pressure was. A heathly KKK turbo should make 20psi + mine only made 18psi !! but it's the original turbo and has done 94,000 miles. It don't smoke either !! So I'm not that worried at the mo !!
Ur confused with testing the actuator !! u can use a foot pump with a gauge and see what pressure it starts to open - it'a way to see if the spring is weak or not !!
You are kidding me right? The ideal AFR for SAFETY on a turbo running 1bar of boost is more like 11.8/12.1. This can only be measured with a wideband lambda sensor as well.
If you have a intercooler/charge cooler I would expect 12 psi to return nigh on 260+BHP as well. Without it should be close to 240-245ish.
N/A and turbo are completey different in terms fuelling. I would agree that 0.91 is rich but a std lambda doesnt really do a wise job past 13.1 in turbo applications.
Emmm maybe he meant it's gonna run lean if the boost is risen even further - it has made 270 in the past without the intercooler - but with the charge cooler etc... so he were aiming for that.
I'll get these injectors and up the fuel pressure then go back and have another play !!
Ur confused with testing the actuator !! u can use a foot pump with a gauge and see what pressure it starts to open - it'a way to see if the spring is weak or not !!
the actuator opens the wastegate to bleed any extra boost out through the exhaust !! so you only make what is governed by the ecu !! - why peeps chip the ecu to up the boost !!
without the actuator the turbo will just keep going until it's full stretch !! about 20 -22 psi on a KKK K16 !!
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