almost perfect boost...10-8-10, but then I ends up around 8 again...
#1
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almost perfect boost...10-8-10, but then I ends up around 8 again...
well, today I installed a boost guage, and I tested my boost in 3rd gear. It was normal, it went to 10, then back to 8 then back to 10, but it ends up at around 7-8 for the rest of the time....does anyone know what can cause this problem? thanks in advance.
#2
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According to the "official" Mazda boost test your results would be within spec as long as the drop off to 8 happens toward redline. However, I know many people who are able to keep 10 psi all the way to redline. I believe a better boost controller (even a DIY home depot one) will help with this.
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Road test with boost gauge
Drive to third gear with normal acceleration
Accelerate from 35 MPH at WOT until passing 4,500 RPM
A slight and smooth increase in power should be felt at approximately 4,500 RPM. This will be about 65 MPH.
RPM PSI
3,000 10
4,500 8 as secondary turbo comes on
4,500 + 10 recovers almost immediately
6,000 + 8 and holds to redline
These readings indicate normal operation. Readings will vary with altitude and temperature, (i.e. lower temperature = higher boost).
Taken from: http://www.scuderiaciriani.com/rx7/boost_problems.html
However when I did it, I got 1.0 bar after transition and let off, but if I'm in 2nd gear I will only get 0.5 bar.
Drive to third gear with normal acceleration
Accelerate from 35 MPH at WOT until passing 4,500 RPM
A slight and smooth increase in power should be felt at approximately 4,500 RPM. This will be about 65 MPH.
RPM PSI
3,000 10
4,500 8 as secondary turbo comes on
4,500 + 10 recovers almost immediately
6,000 + 8 and holds to redline
These readings indicate normal operation. Readings will vary with altitude and temperature, (i.e. lower temperature = higher boost).
Taken from: http://www.scuderiaciriani.com/rx7/boost_problems.html
However when I did it, I got 1.0 bar after transition and let off, but if I'm in 2nd gear I will only get 0.5 bar.
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