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I have a '93 R32 GTR, and have been having some boost issues the past little while.
List of mechanical mods:
Mines ECU
HKS hard piping kit
HKS intercooler
HKS mushroom filters
Toda racing rack
OS Giken Twin Plate clutch
Super spark coilpacks
Equal length downpipe
apexi 4" exhaust w/ cat delete
all vacuum lines replaced with silicone lines
I do race the car occasionally but it is mostly a daily driver. I have, until now, been running at 14.7 psi boost. I do only have the stock gauges in right now but 2 weeks ago at a race it was showing boost to peak at 700 mmHG(14.7psi). Between then and now i have only done normal street driving. I noticed a couple days ago on the highway however that i peak at 7psi now. I can't for the life of me figure out what happened between then and now. Things to note:
1. After the races, the car was allowed to idle for a long time to prevent turbos from cracking.
2. Car runs 100% normally in every other aspect except boost.
3. Boost leak test was done and car hold 30 psi easily with no leaks.
4. ECU has been reset multiple times.
5. Boost solenoid has been changed for new one with no change.
6. Boost starts being built at 2100rpm, where it always has, and builds normally until 7psi.<doesn't seem to be a turbo broken.>
7. Boost peaks at EXACTLY 7psi(slightly above 350 mmHG on my gauge) w/ no fluttering.
8. With timid daily driving for the past 2 weeks or so, i do not know date or time that it actually started happening.
9. Wastegates appear to be in normal condition(not stuck open) but have not been tested yet.
I think thats it. Local shop where i get my tuning done is stumped as to what this could be. Anybody have any suggestions as to what could have happened?
i miss my boost
List of mechanical mods:
Mines ECU
HKS hard piping kit
HKS intercooler
HKS mushroom filters
Toda racing rack
OS Giken Twin Plate clutch
Super spark coilpacks
Equal length downpipe
apexi 4" exhaust w/ cat delete
all vacuum lines replaced with silicone lines
I do race the car occasionally but it is mostly a daily driver. I have, until now, been running at 14.7 psi boost. I do only have the stock gauges in right now but 2 weeks ago at a race it was showing boost to peak at 700 mmHG(14.7psi). Between then and now i have only done normal street driving. I noticed a couple days ago on the highway however that i peak at 7psi now. I can't for the life of me figure out what happened between then and now. Things to note:
1. After the races, the car was allowed to idle for a long time to prevent turbos from cracking.
2. Car runs 100% normally in every other aspect except boost.
3. Boost leak test was done and car hold 30 psi easily with no leaks.
4. ECU has been reset multiple times.
5. Boost solenoid has been changed for new one with no change.
6. Boost starts being built at 2100rpm, where it always has, and builds normally until 7psi.<doesn't seem to be a turbo broken.>
7. Boost peaks at EXACTLY 7psi(slightly above 350 mmHG on my gauge) w/ no fluttering.
8. With timid daily driving for the past 2 weeks or so, i do not know date or time that it actually started happening.
9. Wastegates appear to be in normal condition(not stuck open) but have not been tested yet.
I think thats it. Local shop where i get my tuning done is stumped as to what this could be. Anybody have any suggestions as to what could have happened?
i miss my boost
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