Nick P Posted February 27, 2012 Report Share Posted February 27, 2012 Hi all, I continue to enjoy my recently purchased CR series TR6 with overdrive, but I'm worried about the fuel consumption. The engine has the folllowing upgrades: 1) Stage 3 head. 2) Fast road cam. 3) Extractor exhaust manifold. 4) Performance twin exhaust system. 5) K&N air filter. I'm getting through a worrying amount of fuel and perhaps at the moment I'm enjoying these engine mods a bit too much, however, once I start to ease up on the throttle application etc, can anybody speak from experience regarding the expected MPG for town work and on a run. Nick Quote Link to post Share on other sites
Lee Sellars Posted February 27, 2012 Report Share Posted February 27, 2012 Hello Nick Well with a brand new engine in bog standard CP spec. Pottering around very low 20's sometimes teens when ya boot it at traffic lights. With the back end squating. and on a good motorway run around 34mpg. Par for coause with these monsters. Lee Quote Link to post Share on other sites
Rien Posted February 27, 2012 Report Share Posted February 27, 2012 Hello Nick, My suggestion are, buy a good AFR gauge, a MTX-L 3844 from Innovate Motorsports or something equivalent, I am sure your metering unit can improved for economy and performance. That is why I work on the ECU controlled metering unit. Good luck, Rien Quote Link to post Share on other sites
david johnson Posted February 27, 2012 Report Share Posted February 27, 2012 Mine with a 2700 CC engine, stage 2 head, electronic ignition phoenix exhaust manifold revotec fan etc etc just rebuilt and set up on a rolling road is averaging 22mpg, probably 18 mpg worst. This seems about what you would expect. HP is in the 170s. 0 to 60 7.5. Very noisy exhaust and bags of torque. David. Quote Link to post Share on other sites
TRTOM2498PI Posted February 28, 2012 Report Share Posted February 28, 2012 I too, have a fast road TR6, which recently produced 170bhp & 172lbs ft. I am getting similar figures to David MPG wise. Hi David, What camshaft profile did you go for, and what other mods have you done.? Cheers Quote Link to post Share on other sites
Iain Rollo Posted February 28, 2012 Report Share Posted February 28, 2012 TBH the only way to run these, particularly once you have some serious mods is to think in terms of smiles per mile rather than MPG. Quote Link to post Share on other sites
Nick P Posted February 28, 2012 Author Report Share Posted February 28, 2012 Many thanks for the comments I don't think I'm getting anything like 18 MPG. Fuel injection is a complete mystery to me, are there any simple checks I can do to ensure I don't have a fault ?. Nick Quote Link to post Share on other sites
david johnson Posted February 28, 2012 Report Share Posted February 28, 2012 Mines got Kent TH5 cam Racetorations grp rad fairing for good airflow. Flamethrower coil,Prestige overhead linkage. Bosch pump bigger tank outlet, bigger wiring to pump with relay. Magnecor ignition leads' Re set metering unit. CR throttle bodies. Very big bore exhaust.Uprated distributor. Uprated oil pressure switch. K and N filter Vernier timing and ARP con rod and head bolts. Little bits that add up to a reasonable but sound mid range engine. Strange thing is though the suspension is lowered, with red springs, and with rear telescopics it still has rubber bushes, new in 1998. I will do the bushes and a solid rack mount next year, if I dont get bored with TRs and buy a Fairey Spearfish which I have promised myself. David High fuel use could be many things, from as little as a leak, Why not get the engine tuned and set up. Lots of high power use can lead to single figure fuel use in 6 cyl TRs I know from experiance. Quote Link to post Share on other sites
006 Posted February 28, 2012 Report Share Posted February 28, 2012 ditch the cam, youve put in a cam that was not designed for that engine, lousey tick over, poor fuel consumption. noisey it will soon need changing any way. followers wearing out soon. cam lobes following. you can get more hp out of a late type cam than most of the after market cams upto 280 degrees with no massive great big hole in the T curve as well. and alot better fuel consumtion too. better idle quieter then spend some time, getting the fueling and ign right on a RR, whose operator knows what he doing. Quote Link to post Share on other sites
david johnson Posted February 28, 2012 Report Share Posted February 28, 2012 Cam seems OK. Tick over is smooth, well balanced butterflies really help. Fuel consumption at 22 is in the expected range. Engine is quiet and smooth. All set up on rolling road. As my other note the problem is the fuel pump. Once I am happy with this it will be very good for a TR6. It is somebody else who has fuel consumption problems. David. Quote Link to post Share on other sites
Anschutz Posted March 5, 2012 Report Share Posted March 5, 2012 Even when new most owners were in the teens when about town but you should get mid to high twenties if on a steady run (a lot less with Webers)check your vacum to the metering unit, it depends on good vacum it should be about 8 to 10Hg tickover on a PI Quote Link to post Share on other sites
Nick P Posted March 5, 2012 Author Report Share Posted March 5, 2012 Anschutz, how do I check the vacuum ?. Nick Quote Link to post Share on other sites
Guest ntc Posted March 5, 2012 Report Share Posted March 5, 2012 Even when new most owners were in the teens when about town but you should get mid to high twenties if on a steady run (a lot less with Webers)check your vacum to the metering unit, it depends on good vacum it should be about 8 to 10Hg tickover on a PI 30 mpg can be done with Webers, get your facts right Quote Link to post Share on other sites
OldBob Posted March 6, 2012 Report Share Posted March 6, 2012 30 mpg can be done with Webers, get your facts right just for the record, the average speed would be ? Quote Link to post Share on other sites
Guest ntc Posted March 6, 2012 Report Share Posted March 6, 2012 just for the record, the average speed would be ? Exceeding the limit 1200 mile round trip Quote Link to post Share on other sites
heckler Posted March 6, 2012 Report Share Posted March 6, 2012 30 mpg can be done with Webers, get your facts right . Best I've. seen is 28mpg on a long run , standard cp on 40's. Chris Quote Link to post Share on other sites
Red 6 Posted March 7, 2012 Report Share Posted March 7, 2012 My attention was drawn to an advert for a honda jazz, and was surprised to see that the 1.4cc engine produced as much performance as a tr6 and gives 47mpg. Obviously a misprint. Quote Link to post Share on other sites
Mike Goldthorpe Posted March 7, 2012 Report Share Posted March 7, 2012 (edited) Fairly standard late-ish TR6 (only had exhaust replaced and a K&N filter) I got teens in town and about 26 +/- on the open highway. In the UK this was motorway at an indicated 80-some. In New Zealand it was at an indicated 65-70 (tickets tended to come fairly frequently at anything over 65!). Edit: This was also with an O/D box and a 3.45 diff Edited March 7, 2012 by Mike Goldthorpe Quote Link to post Share on other sites
Peter Cobbold Posted March 7, 2012 Report Share Posted March 7, 2012 My attention was drawn to an advert for a honda jazz, and was surprised to see that the 1.4cc engine produced as much performance as a tr6 and gives 47mpg. Obviously a misprint. Lots of differences and 40 years' global R&D help drive down consumption. Weight, frontal area, rolling resistance and in engine: max rpm, CR, breathing, combustion chamber turbulence, efi spark and fuelling control.....etc etc. Amazing really that both cars depend ultimately upon the same chemistry - burning petrol. The TR6 doesn't do it terribly well by modern standards. But the TR has the big advantage that we can repair it ourselves when things go wrong. Quote Link to post Share on other sites
Tony Millward Posted March 8, 2012 Report Share Posted March 8, 2012 (edited) But the TR has the big advantage that we can repair it ourselves when things go wrong. Hallelujah to that.... Cheers Tony Edited March 8, 2012 by Tony Millward Quote Link to post Share on other sites
Anschutz Posted March 9, 2012 Report Share Posted March 9, 2012 (edited) Sorry for the delay in replying Nick P, problems with Windows on the computer. Hope the pics upload OK when I finally sort out how to get them on!. <a href="http://www.flickr.com/photos/anschutz2/6966655695/" title="TR Manifolds 001 by Anschutz2, on Flickr"><img src="http://farm8.staticflickr.com/7187/6966655695_ff4592949a.jpg" width="375" height="500" alt="TR Manifolds 001"></a> <a href="http://www.flickr.com/photos/anschutz2/6966656421/" title="TR Manifolds 004 by Anschutz2, on Flickr"><img src="http://farm8.staticflickr.com/7064/6966656421_30ffccbd62.jpg" width="500" height="375" alt="TR Manifolds 004"></a> Edited March 9, 2012 by Anschutz Quote Link to post Share on other sites
kiwican Posted March 9, 2012 Report Share Posted March 9, 2012 Sorry for the delay in replying Nick P, problems with Windows on the computer. Hope the pics upload OK when I finally sort out how to get them on!. <a href="http://www.flickr.co...tz2/6966655695/" title="TR Manifolds 001 by Anschutz2, on Flickr"><img src="http://farm8.staticf..._ff4592949a.jpg" width="375" height="500" alt="TR Manifolds 001"></a> <a href="http://www.flickr.co...tz2/6966656421/" title="TR Manifolds 004 by Anschutz2, on Flickr"><img src="http://farm8.staticf..._30ffccbd62.jpg" width="500" height="375" alt="TR Manifolds 004"></a> Is the blue hose just connected to a vacuum gauge or do you have it have it connected to the advance on the distributor? Thanks Simon. Quote Link to post Share on other sites
Anschutz Posted March 15, 2012 Report Share Posted March 15, 2012 (edited) Goes to a normal car vacuum gauge such as http://www.speedogra...ial_offers.html although you sometimes find black dial gauges on ebay etc. Also when working vacuum will not be as good as if fitted to carbs. Black gauge http://thegaugeshop.com/shop/category_8/VACUUM-GAUGES.html?shop_param=cid%3D%26 If you do get one that needs a refurb use http://www.jdo10.pwp.blueyonder.co.uk/ Excellent service and good price. Edited March 15, 2012 by Anschutz Quote Link to post Share on other sites
john.r.davies Posted March 15, 2012 Report Share Posted March 15, 2012 (edited) 30 mpg can be done with Webers, get your facts right Webers can't have been set up right! Nick P, Before Anschutz gets back - a vacuum guage! AKA an economy gauge. EG http://www.ebay.co.u...=item3f1354fe7b T-piece in the vacuum line to the M/u, mount dial temporarily on the dash. See: John PS Don't be like the guy in the video - driving and filming at the same time! PPS Oh! Anschutzs is back - anyway! Edited March 15, 2012 by john.r.davies Quote Link to post Share on other sites
Peter Cobbold Posted March 16, 2012 Report Share Posted March 16, 2012 Is the blue hose just connected to a vacuum gauge or do you have it have it connected to the advance on the distributor? Thanks Simon. The blue hose take-off is on the inlet valve side of the closed butterfly. A better site for supplying the vacadv capsule is opposite the throttle edge when it is open about one fifth of its swing, at the top. The vacuum is greater at cruise and it wont advance the spark at tickover. A driiling though the steel sleeve just at the outer edge of the aluminium is about right, although a small nick will be needed in the rubber plenum hose. Quote Link to post Share on other sites
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