Boost And Rpm

[stiffler]

I have a r32 gtr with r34 n1 turbos ( the larger ones i think its the 402's ). Im running 20 psi boost but it feels really laggy under 3500- 4000 rpm. does this sound right?

[R31Nismoid]

Not really - R34 N1's should be ramping up nicely onto boost by 3500rpm at the latest.

Could be anything wrong with it from cam gear settings/timing to actuators/tune and so on.

[MrStabby]

I hit 15 psi at about 3900rpm with the same turbos. Have you got a boost vs RPM graph? AFAIK there's only one size of R34 N1. What does the 402 refer to?

[stiffler]

I hit 15 psi at about 3900rpm with the same turbos. Have you got a boost vs RPM graph? AFAIK there's only one size of R34 N1. What does the 402 refer to?

When i pulled the turbos off to check what they were exectly there was a tag on the turbo inbetween the compressor and exhaust housing which had this info.

im not sure which code it was so correct me if im wrong

AA401 r33 n1 bb .62

AA402 r34 n1 bb .62

AA403 r34 n1 bb .42

there is a code for the r32 gtr n1 turbo but its not a ballbearing turbo. My number my be a bit off and im sure the .62 refers to size of exhaust housing. I've got a dyno graph but i reckon the guys just gave me a printout of another car because things just dont make sense