A single actuator that can be driven by either vacuum or boost, two separate
actuators, or a single vacuum-only actuator with an electric pump to operate it
under boost ?
----- Original Message -----
From: Jason C
To: Robert McElwee ; Sam Sharp
Cc: Bill Cardell ; [email protected]
Sent: Wednesday, August 27, 2008 8:20 AM
Subject: Re: MPG (was Dyno Results from Changing from a Link to a Hydra)
AFAIK higher altitude gives better MPG because of the lower pumping
losses through the throttle butterfly.
The twin turbo BMW 335i gets very good cruise MPG for its weight and
power (29 by Car&Driver), and I believe part of the reason is that the
wastegates open during cruise. They have a vacuum operated actuator to open
them.
--- On Tue, 8/26/08, Sam Sharp <[EMAIL PROTECTED]> wrote:
From: Sam Sharp <[EMAIL PROTECTED]>
Subject: Re: MPG (was Dyno Results from Changing from a Link to a
Hydra)
To: "Robert McElwee" <[EMAIL PROTECTED]>
Cc: "Bill Cardell" <[EMAIL PROTECTED]>, [email protected]
Date: Tuesday, August 26, 2008, 6:31 PM
I got 35.6 with my '03 FMII on one tank driving home from the Open
House. The next tank was only 31.something, but that was at lower altitude.
Sam
On Tue, Aug 26, 2008 at 4:22 PM, Robert McElwee <[EMAIL PROTECTED]>
wrote:
I just swapped out the injectors in my MPG car (went from the 440's
back to OEM) and had to decide whether or not to hack up the stock harness for
sequential. I was hoping there was a significant difference so I stuck with
sequential for the new injectors.
I am installing some #4 heat range plugs with larger gaps in the
MPG car today. Trying to chase down the miss fire problem I am having. I know
people over estimate the MPG they get on their Miatas but DAMN I have been
stuck at 35 MPG for weeks and can't get over that hump. I need to get the car
out on the interstate for a nice long drive to see what my MPGs really are. I
just can't understand how people are getting 28-30 on a stock Miata and my
modified car doesn't get much better . I think it is time to check my
speedometer against the GPS because I should be higher than this. I am running
stock 14" 7-spoke wheels so I would figure my speed should be spot on but you
never know.
On Tue, Aug 26, 2008 at 6:09 PM, Tony Cooper <[EMAIL PROTECTED]>
wrote:
I gained 3 or 4 mpg while cruising at 60-65mph when I switched to
sequential on my SC equipped 1.6 miata.
Matt Yates wrote:
> FWIW, the MegaSquirt FAQ says they dont run sequential
injection because
> they see no significant benefit other than around idle.
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--
Robert McElwee and Blue Flash
"The 50 MPG Miata"
www.lightweightmiata.com/mpg
Lightweight Miata Forum:
www.lightweightmiata.com/forum
The Miata Trailer Project:
www.lightweightmiata.com/trailer
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