Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-14-2021, 10:46 AM   #11 (permalink)
Master EcoModder
 
Join Date: Jan 2012
Location: United States
Posts: 1,565

spyder2 - '00 Toyota MR2 Spyder
Thanks: 95
Thanked 314 Times in 243 Posts
Quote:
Originally Posted by BongoBennie View Post
It's an a3 head on an a2 block... A3 head will give any K20a2 piston an additional .5cr due to smaller CC.

It's only @5.5psi so the easiest way to drive no boost is by light throttle. The car can be driven fast as a civic without hitting boost.
Ah, I see, good to know.

It doesn't matter how little boost the turbo produces, if you have extra restriction in the exhaust at part throttle, it's wasted energy. If you lose 1psi of restriction you'll pick up on the order of 1mpg from pumping loss reduction alone. Additionally, if the turbo is reducing manifold vacuum, you're reducing the internal EGR effect at part throttle too.

That's what electronic wastegate control is basically for; you'll never see an OEM running a passive wastegate.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-23-2021, 01:05 AM   #12 (permalink)
lead foot
 
Join Date: Oct 2011
Location: United States
Posts: 106
Thanks: 2
Thanked 51 Times in 31 Posts
Quote:
Originally Posted by serialk11r View Post
Ah, I see, good to know.

It doesn't matter how little boost the turbo produces, if you have extra restriction in the exhaust at part throttle, it's wasted energy. If you lose 1psi of restriction you'll pick up on the order of 1mpg from pumping loss reduction alone. Additionally, if the turbo is reducing manifold vacuum, you're reducing the internal EGR effect at part throttle too.

That's what electronic wastegate control is basically for; you'll never see an OEM running a passive wastegate.
Yeah, my smart friend suggested an "active wastegate" that can remain open at low power levels, maybe in a later stage

Next mods in store... 3.4:1 FD is ordered
will be going to 08 Civic Hybrid 15" rims .... might stick with 24" and go with 175/65/15 Michelin Energy savers
or
185/55/15 Yokohama ADVAN Fleva 23" which would still be taller ratio than what I have now with the 4.1 FD

I'm also starting to drive a bit slower and actually letting some people pass me, I figured the FD change will also slow down the car a bit
__________________
2001 Insight 11.5:1 K20a3 turbo / 2003 Civic 4x4
  Reply With Quote
Old 05-24-2021, 01:58 PM   #13 (permalink)
Too many cars
 
Gasoline Fumes's Avatar
 
Join Date: Oct 2009
Location: New York State
Posts: 1,397

CRXFi - '88 Honda CRX XFi

Insight 256 - '00 Honda Insight
Team Honda
Gen-1 Insights

Insight 5342 - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 65.78 mpg (US)
Thanks: 956
Thanked 675 Times in 396 Posts
Quote:
Originally Posted by BongoBennie View Post
I'm also starting to drive a bit slower and actually letting some people pass me
Iron foot now?

__________________

  Reply With Quote
The Following User Says Thank You to Gasoline Fumes For This Useful Post:
Ecky (05-24-2021)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com