Rb20det. No Power On Boost. Stumbles/hesitates When Boost Is Coming On.

[rayj]

hi, i got this problem and wanted to see what would be the most likely problem.

rb20det engine with a vg30 turbo.

once the turbo starts spooling and reaching boost, there is no power. instead the car stumbles/hesitates.

during normal driving, in the rev range before the turbo starts to kick in, it drives perfectly, no missfires, no stumbling or hesitation.

im running new NGK BCPR6ES-8 plugs

i can switch between 10 and 13 psi boost.

thanks for your help

[R TUNE]

Probly a boost leek or exhasut leek.

Also i found when putting my rb25 turbo on (45v2) the AFR before 5000rpm is 13:1 so very lean which wont help.

you might have craked a spark plu or not put the coil packs back on.

[rayj]

Probly a boost leek or exhasut leek.

Also i found when putting my rb25 turbo on (45v2) the AFR before 5000rpm is 13:1 so very lean which wont help.

you might have craked a spark plu or not put the coil packs back on.

the spark plugs are fine. i just put them in yesterday. this problem has been happening for a week or two now.