Quickest Spooling
Junior Member
Joined: Aug 2001
Posts: 509
Likes: 0
From: Irvine, CA, USA
Re: Quickest Spooling (idewson)
huh?
The goal of a quick spool is to achieve power at lower RPM...streetable powerband
Achieving this quick spool is dependent upon several factors, namely:
- Size of engine (capacity to spool the turbo)
- Turbo itself (sizing...look at compressor map; journal vs. ball bearing)
- manifold (equal length = good) and heat retention (thermal wrap)...but that's a smaller effect
what else...perhaps the tune, whatever...
The goal of a quick spool is to achieve power at lower RPM...streetable powerband
Achieving this quick spool is dependent upon several factors, namely:
- Size of engine (capacity to spool the turbo)
- Turbo itself (sizing...look at compressor map; journal vs. ball bearing)
- manifold (equal length = good) and heat retention (thermal wrap)...but that's a smaller effect
what else...perhaps the tune, whatever...
Honda-Tech Member
Joined: Mar 2001
Posts: 4,408
Likes: 4
From: Somewhere in California
Re: Quickest Spooling (archmage)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by archmage »</TD></TR><TR><TD CLASS="quote">-manifold (equal length = good) and heat retention (thermal wrap)...but that's a smaller effect
</TD></TR></TABLE>
Actually, I've read on here that log manifolds spool up faster but have poor topend, while EL's spool slower but have great topend. To me it sorta makes sense because if you look at the design of a log mani the exhaust gasses go right into the turbine via short runners at no regular interval. This means the exhaust gas gets to the turbine faster, but at upper RPMs the increased turbulence from the exhaust pulses all trying to get into the turbine hurt performance. While the EL manis have longer runners which means the exhaust pulses have to go slightly further to get to the turbine. But the lengths of the individual runners can be sized so the the pulses from each cylinder arrive at the turbine at regular intervals.
...or something like that, that's how I understand it anyways. Ask J Davis, he might be able to explain it better, hehehe.
</TD></TR></TABLE>
Actually, I've read on here that log manifolds spool up faster but have poor topend, while EL's spool slower but have great topend. To me it sorta makes sense because if you look at the design of a log mani the exhaust gasses go right into the turbine via short runners at no regular interval. This means the exhaust gas gets to the turbine faster, but at upper RPMs the increased turbulence from the exhaust pulses all trying to get into the turbine hurt performance. While the EL manis have longer runners which means the exhaust pulses have to go slightly further to get to the turbine. But the lengths of the individual runners can be sized so the the pulses from each cylinder arrive at the turbine at regular intervals.
...or something like that, that's how I understand it anyways. Ask J Davis, he might be able to explain it better, hehehe.
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