Turbo'd GQ TB42 EFI Help!!

[Mick Patroln]

Hi all I recently put an aftermarket turbo on my 96 Gq 4.2 EFI its dual fuel (Petrol,Gas) and upon getting it dyno tuned it couldn't handle anymore than 4 pound boost which is pretty low it also pings from about 3000rpm on fuel and slightly on gas! so I was wondering if anyone else has turbo'd this motor before and if so have you managed more boost than this and did it ping?
cheers Mick

[Ben-e-boy]

You may need to take some timing out of it, or try an octane booster.
Ideally you want to lower the compression

[Mick Patroln]

yeh mate I've try'd both octane booster helps but not completely and timing is set too advanced 8 degress I've tried both retarding it and advancing it either way and it either gets worse or dosent perform right.

[nissannewby]

Standard ecu? Standard injectors?

[Mick Patroln]

yeh mate both are standard. Have thought that but injectors and ecu should be sufficient enough for 4 pound boost surely!

[nissannewby]

yeh mate both are standard. Have thought that but injectors and ecu should be sufficient enough for 4 pound boost surely!

It probably should but you want to run 2 fuels so it will always be hard to find the sweet spot.

[idiot 1]

did you just bolt turbo on and do nothing else. or have you had petrol pressure upped and gas converter needs doing to.

[jff45]

Do you have an intercooler? Do you have a boost referenced fuel pressure regulator?
Your detonation could be caused by intake air temps too high and/or insufficient fuel under boost.

[Mick Patroln]

I had a new gas convertor fitted which is adjustable for tuning other than that mate just dyno tuned once turbo kit was fitted.

[Mick Patroln]

hi John its not intercooled as of yet in the process of doing that. and I havnt touched anything fuel pressure wise! I have been thinking its simply tuning or fuel and air mixtures but i'm unsure on how or wat to do.