Hi Jim,
Ooopps, I'm working in Imperial Gallons, not US gallons. That may explain
the difference....
Cheers
Bernard
At 15:17 1/06/00 -0500, Jim Davis wrote:
>Bernard,
>I am amazed at your gas mileage, my 74 TR6 is only getting 15-18 mpg.
>I am now wondering if I have a fuel leak that I am unaware of.
>Is everyone else getting that kind of mpg?
>
>Jim Davis
>1974 TR6
>Colorado
>
>-----Original Message-----
>From: Bernard Robbins [mailto:brobbins@wlg.nec.co.nz]
>Sent: Thursday, June 01, 2000 1:31 PM
>To: Shawn Mann; triumphs@autox.team.net
>Cc: 6pack@autox.team.net
>Subject: Re: EFI on TR6??
>
>
>Hi Shawn,
>
>Yep, I reckon Fuel injection is the way to go. My TR6 PI is putting out
>around 165~170 bhp and still has very good manners around town. While it is
>true the hotter cam reduces the low down torque, I have a nice smooth idle
>(at arounnd 850 RPM rather than std 650) and the car will quite happily
>pull away from 1000 RPM in 3rd gear without lugging. The major sacrifice
>with this car is in the fuel economy - I normally only get 27 MPG cruising
>at 70MPH where as a friend with a standard PI is getting up to 35 MPG.
>
>The limitation I am having with the original lucas system is that it only
>senses off vacuum and with the lumpy cam, consquently it runs way rich at
>idle.
>
>The EFI systems have the advantage at idle (below 1000 rpm) you can program
>the controller to ignore the vacuum and read solely off the O2 and throttle
>position sensors. The result is a nice smooth idle.
>
>I'm currently modifying a Lucas PI system to take toyota injectors and hope
>to have that installed in the next month or so (I's just waiting to get
>into my brothers workshop). I'll install this on my Triumph saloon and use
>it daily for a couple of months just to sort out any reliability problems.
>
>I have driven a carbed Triumph saloon car (identical engine to the US spec
>TR6) fitted with EFI and the difference over carbs was quite impressive. No
>major increase in power, but the whole engine was far more responsive and
>much happier to rev (normally these start to struggle after 4500 RPM but
>with EFI reached redline no worries at all!). This guy also improved his
>fuel economy from 28 MPG up to 33 around town and 41 on the open road at 65
>MPH.
>
>There is a crowd at advance in the states who do an EFI conversion for the
>TR6, but I can't find the link.
>
>I don't know too much about the exhaust side of things, but I understood
>(from the local classic car racing boffins) there is not too much to be
>gained over the stock twin pipe manifolds. My car is stock, but has a
>higher flow muffler from a BMW 540. I installed this because the exhaust on
>the car was two straight pipes when I got it (very unpleasant, but mighty
>quick).
>
>My understanding is a higher flow exhaust also reduces the inlet vacuum but
>as I say, I know very little about it.
>
>Perhaps someone else can add to the subject about the exhausts.
>
>
>Hope this is helpful
>
>Cheers
>Bernard Robbins
>
>'71 2500 PI
>'73 TR6 PI
>
>
>
Regards
Bernard Robbins
Installation Department
NEC New Zealand Ltd
P.O. Box 1936
Wellington
Ph (04) 381 6274
fax (04) 381 6284
email brobbins@wlg.nec.co.nz
|