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Need Help Laggy Gtr R32


Goved5
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Hi guys, I recently acquired a R32 GTR from Japan. The car is great. Just one issue, it is very laggy, on 1st gear i get max boost at about 5000 rpm, in 5th gear on the highway full boost is only at 4000rpm. Timing seems fine ,CAS is at center position. I cannot see the turbos clearly but the they look standard. Apparently the engine was rebuilt in Japan. Any ideas what can cause this lag? It has a jasma exhaust and decat.

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Hi guys, I recently acquired a R32 GTR from Japan. The car is great. Just one issue, it is very laggy, on 1st gear i get max boost at about 5000 rpm, in 5th gear on the highway full boost is only at 4000rpm. Timing seems fine ,CAS is at center position. I cannot see the turbos clearly but the they look standard. Apparently the engine was rebuilt in Japan. Any ideas what can cause this lag? It has a jasma exhaust and decat.

Need more info, and timing can't seem fine, just looking at the cas doesnt cut it, get a timing light and check it out correctly. Non specific rebuild unknown turbos etc mean random people on the net wont know your problem.
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Thanks, I have checked timing with a timing light and its on the spot. Also have apexi intakes. The car came with the Jasma 051 exhaust apparently it's a HKS exhaust in Japan, the cat was removed. It still has the resonator and muffler only, does anyone know if this exhaust is restricting my boost coming on earlier? The car feels crisp off boost and once on full boost it is very strong. It's just the lag which is a concern. The turbos are stock garretts.

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Can I ask how much it costed you to import and register it?? I was thinking of doing that after u drove my friends r32 Gtr, they go hard and I think he has the same problem as you, I couldn't feel the boost coming in until after 4000-5000rpm

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Tried to read the tag but it's almost impossible. I managed to view the compressor and turbine housing respectively, and compressor is A/R 0.42, whilst turbine housing is .48, this mean they stock ceramics? I also opened the cam cover and verified the pulleys lined up ,and they do, at TDC both pulleys line-up with plate marks. I'm now stumped, i need to check if there is a boost leak.

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This my sound stupid but its worth checking the one way valve on your brake booster. Do you ever experience a very hard brake pedal after being on full boost? this happened in my R34 GTR and caused boost to come on around 500 - 800 rpm late. Its a very simple fix.

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The one way valve at the brake booster is working fine. I am getting about 0.4 bar boost at 3000 in 3rd gear. Also vacuum at idle is almost -0.6bar. When the car is in neutral if I rev it, I get about 0.5 bar at 6000rpm. Is this normal for a stock GTR? The factory boost restrictor is removed, also exhaust is decat.As a test I disconnected the pipe with restrictor removed at the boost solenoid. hence no boost source to actuators. The car was still laggy but boost exceeded 1 bar for a split second. I didnot want to overboost and loose a ceramic wheel so immediately stopped.

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Not sure if this is related to my lag problem , recently overnight I lost clutch peddle to the floor after pressing it, checked the clutch fluid reservoir and it was almost empty, I topped it up, afterwards I am noticing my clutch peddle is extremely hard to press but the clutch fluid is still full in the reservoir?

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