Background…
Major upgrade..TTE500 turbos, 535 LPFP, VSRF inlets and charge pipe, decat down pipes, Fox cross over and exhausts, VTT turbo outlets, Forge DVs, Wagner 7.5” FMIC..stock air back with Pipercross filter, NGK stage 1 colder 22 thou, Index 12 injectors..
All was going so well, a few hundred miles, several runs on the dyno circa 20 psi boost 500 BHP , 680 nm torque on 98 Ron fuel..chasing a misfire on cylinder no 6 at 6,200 ish…
Tuner asked to change plugs n coils to check if that affected misfire on cyl 6, swapped 1 and 6 coils and fitted colder NGK at 22 thou..went out no change, strong pull with 1 out of 6 with cylinder 6 misfires.
Tuner asked for cylinder 6 injector to be checked..duly checked..no observable issues, fresh seal and decoupler fitted..
Went out and before reaching the ‘pull zone’ bong and the half dead engine symbol lit up..a code check showed the 30FF code..
I went ahead and did the pulls..
So here’s some earlier logs with no errors apart from the oEd misfire on cylinder 6 at 6k rpm…
and here are the logs with boost impaired..
So it’s getting some boost around 6 psi not 21 psi..
I started to do some vacuum tests which showed a leakage fault on the rear boost controller ..I swapped it out for a new Pierburg..no change.
I took it to my tame Indy / dyno guys..they confirm no obvious loose connections anywhere in the inlets, turbos, intercooler and charge pipe..
So it’s work in progress due to availability of people and resources..I realise that we’ve not done a fully comprehensive set of tests..
Any views on where to look would be appreciated…so no error on start up or under modest throttle…which I understands tends to preclude boost leaks..
RSVP
Major upgrade..TTE500 turbos, 535 LPFP, VSRF inlets and charge pipe, decat down pipes, Fox cross over and exhausts, VTT turbo outlets, Forge DVs, Wagner 7.5” FMIC..stock air back with Pipercross filter, NGK stage 1 colder 22 thou, Index 12 injectors..
All was going so well, a few hundred miles, several runs on the dyno circa 20 psi boost 500 BHP , 680 nm torque on 98 Ron fuel..chasing a misfire on cylinder no 6 at 6,200 ish…
Tuner asked to change plugs n coils to check if that affected misfire on cyl 6, swapped 1 and 6 coils and fitted colder NGK at 22 thou..went out no change, strong pull with 1 out of 6 with cylinder 6 misfires.
Tuner asked for cylinder 6 injector to be checked..duly checked..no observable issues, fresh seal and decoupler fitted..
Went out and before reaching the ‘pull zone’ bong and the half dead engine symbol lit up..a code check showed the 30FF code..
I went ahead and did the pulls..
So here’s some earlier logs with no errors apart from the oEd misfire on cylinder 6 at 6k rpm…
11th iteration to to correct misfire
Data logging went wrong ..only one log..will re-do.. swapped coils 6 and 1, fitted NGK colder plugs at 22 thou.. First run misfired on 6 again! However next 5 pulls no misfire…weird..will redo runs..
www.spoolstreet.com
and here are the logs with boost impaired..
Real sudden loss of boost ignore earlier post
Any ideas along with 30FF fault code
www.spoolstreet.com
So it’s getting some boost around 6 psi not 21 psi..
I started to do some vacuum tests which showed a leakage fault on the rear boost controller ..I swapped it out for a new Pierburg..no change.
I took it to my tame Indy / dyno guys..they confirm no obvious loose connections anywhere in the inlets, turbos, intercooler and charge pipe..
So it’s work in progress due to availability of people and resources..I realise that we’ve not done a fully comprehensive set of tests..
Any views on where to look would be appreciated…so no error on start up or under modest throttle…which I understands tends to preclude boost leaks..
RSVP