Adjusting Boost

[Gregory Chan]

> Date:          Sat, 9 Aug 1997 23:32:02 +0800
> To:            diy_efi at coulomb.eng.ohio-state.edu
> From:          bibie at cyber-wizard.com (Bibiana Lim)
> Subject:       Adjusting Boost
> Cc:            DanLlwln at ix.netcom.com
> Reply-to:      diy_efi at coulomb.eng.ohio-state.edu

> Hi Dan,
> 
> Thanks for the Feedback! Heaps of new info to absorb...some are really
> out of my capability to comprehend but I promise to do more research
> on your discussion.
> 
> You wrote:
> >I have been wondering about electronic boost controllers (EBC) because
> >I have heard at lot of stuff that just didn't make sense.
> 
> >Seems to me that the main benefit is that it keeps the wastegate
> >closed longer before opening up.  A regular wastegate using a spring
> >starts to open before the boost is near the desired level so that
> >the wastegate is fully opened by the time (or rather pressure) that the
> >maximum boost is reached.  I don't see that it will add any more
> >top horsepower, but maybe some middle HP after reaching about 1/2 full
> >boost.
> Good point!
> No..I don't think it will increase more power...but I only want it to happen
> sooner...like much earlier. If you can't beat the guys .. at least I could keep
> up during the pickup(start) until somewhere in middle HP.
> 
> >The people selling the EBC (or EVC) talk about an extra 50HP on
> 
> Wow! is this true! No wonder it is expensive!
> 
> >my 435HP, .85Bar engine but I am skeptical.  Anybody do a controlled
> >test with these?  I have talked to a guy who does some racing (pretty
> >successful too) and he doesn't think much of EBC.
> 
> >What about the difference between high quality vs low quality
> >wastegates?  Do the better ones stay closed longer using a regular
> >pressure regulator?  I am using an HKS racing wastegate now which
> >maintained a very consistent boost on the engine dyno unlike another
> >wastegate I once had.
> 
> I guess we'll have to hear from the others on this..right!
> 
If the motor is a North American CA18ET of mid-eighties vintage
a bit of porting will do wonders in conjunction with a Nissan
Motorsports European spec camshaft. 

gchan at compserv.senecac.on.ca