How Much Boost Is Bad?
#23
Originally Posted by cmartinp28' date='May 3 2003, 10:00 PM
you know........... i've always wondered that......... 10psi + 10psi = 20psi right
I do understand the manifold won't flow that, and that's HELLA heat... I just wanna know why 15 seems to fry turbos... Dosen't seem logical!
#25
I think that basically the primary turbo has a different trim wheel or different A/R then the secondary. Thats why the primary can do 10 psi. When you crank up the boost it does combine it proportionally between the primary and secondary. I have no idea though I'm just guessing about that.
The major killer is the heat and the RPM. They don't like 100,000+ rpm for extended periods.
The major killer is the heat and the RPM. They don't like 100,000+ rpm for extended periods.
#27
I have a lot of experience in turbocharged cars. I'm fairly new to the rotary scene but the basic principals are the same. It is true that the exact same engine can make more or less power on the same 12psi of boost from different turbos. Like someone already said all turbos have a flow rate they are most efficient at and will make the biggest power gain in these areas. A small turbo straining to make 12psi will rob more power from an engine because it blocks exhaust flow and has to be spun super fast which takes energy. Of course the smaller turbo will spool faster.
#29
Originally Posted by rx7machine' date='May 3 2003, 12:25 AM
Humm.. 12psi.. so, is there any point to run a single turbo if you're going to stay at 12psi or under? (sorry that was off-subject)
P.S. If I screwed the spelling in this sorry. I live off Outlook spell check
#30
Can someone give me a quick run down on how the seq turbos work? I've worked on volvos for a while, but never done any reading at all on tt cars. I always thought the first turbo ran low boost like 5lbs in the lower RPM's and then at around 3000rpms the second turbo kicked in w/ like 10-12psi and the primary one shuts off? now how wrong am i?