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Blow off valves and turbochargers have gone hand in hand for almost as long as the turbocharger has been in existence.
There are various theories about the requirements for the blowoff valve, including the ability to reduce the thrust load on the turbocharger and prevent expensive failures, and releasing the pressurised inlet charge air when the throttle is closed to help reduce lag or improve spool when the driver opens the throttle.
In this webinar, we’ll do some investigation of our own and analyse what the data shows us using our Mazda Rx7 fitted with a Borg Warner EFR8474.
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0:00 Introduction
0:50 How the data was gathered
01:10 RX7 overview
03:55 SR86 overview
06:55 What does the blowoff valve do?
13:35 Ball bearing turbos
14:45 Applications without blowoff valves
15:30 Data gathering demo
19:05 Testing issues/limitations
21:15 Reviewing the data RX7
26:10 Reviewing the data SR86
29:45 Conclusions
32:05 Questions
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