dblenk Posted July 2, 2018 Report Share Posted July 2, 2018 HI talking to a guy at the IWE we got talking about torque (acceleration) what was the most you can mod a TR6 engine thought it was around 220blft whats your thoughts ?? david Quote Link to post Share on other sites
Tom Fremont Posted July 2, 2018 Report Share Posted July 2, 2018 Normally aspirated? If not, then I'd guess higher than that, as 10 psi boost ( this is modest enough; my Cadillac gets 20 ) should enable up to 250 or so. Cheers, Tom Quote Link to post Share on other sites
TRTOM2498PI Posted July 2, 2018 Report Share Posted July 2, 2018 Hi David, I have seen just over that on a RR print out on a dyno report for a race TR5 last year. I am just over 200lbs ft on a 6. Cheers. Quote Link to post Share on other sites
dblenk Posted July 2, 2018 Author Report Share Posted July 2, 2018 Hi Tom i was thinking standard PI but yeah i remember there is a supercharge kit that can really sort it giving greater acceleration would need low compression on the head Guess Pete Cobbold is the man to answer this one david Quote Link to post Share on other sites
TRTOM2498PI Posted July 2, 2018 Report Share Posted July 2, 2018 (edited) Hi David, I achieved just over 200lbs ft on Lucas PI, but quite a few mods, etc. Cheers. Edited July 3, 2018 by TRTOM2498PI Quote Link to post Share on other sites
Tim D. Posted July 2, 2018 Report Share Posted July 2, 2018 Have a supercharger on low compression head and recently rebuilt engine.. currently only running 4psi boost but once run in will go to 7psi and get a RR run to see what it is giving.. However one thing I will say is that the torque comes in lower than you get with the PI.. Cheers Tim Quote Link to post Share on other sites
Peter Cobbold Posted July 2, 2018 Report Share Posted July 2, 2018 (edited) Hi Tom i was thinking standard PI but yeah i remember there is a supercharge kit that can really sort it giving greater acceleration would need low compression on the head Guess Pete Cobbold is the man to answer this one david David, Tom. I get "enough". 2600prm and around 6psi boost gave 100hp at the fwheel Not sure what torque that is. As Tim says the torque comes in with booost, so at low rpm. Ideal for easing the steering on twisty roads in od top at 1500rpm.- flooring the throttle gives instant 3 psi boost and a significant 'push' towards oversteer. Low compression not necessary with water injection...one day I'll get it working. Peter. Edited July 2, 2018 by Peter Cobbold Quote Link to post Share on other sites
Mike C Posted July 2, 2018 Report Share Posted July 2, 2018 David, Tom. I get "enough". 2600prm and around 6psi boost gave 100hp at the fwheel Not sure what torque that is. As Tim says the torque comes in with booost, so at low rpm. Ideal for easing the steering on twisty roads in od top at 1500rpm.- flooring the throttle gives instant 3 psi boost and a significant 'push' towards oversteer. Low compression not necessary with water injection...one day I'll get it working. Peter. Extraordinary- this calculator says that's a torque of 396 ft-lbs : https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwjl55-XwYHcAhUT77wKHZ2vAY0QFjABegQIABAB&url=http%3A%2F%2Fnepsi.com%2Fresources%2Fcalculators%2Fmotor-torque.htm&usg=AOvVaw1HktBYjWYoyN5cbsUp7JoU Quote Link to post Share on other sites
Tim D. Posted July 3, 2018 Report Share Posted July 3, 2018 Always a tad dubious of those calculators.. If you want to look at a wide range of tuned TR6s have a look at the dyno charts on : http://www.6-pack.org/vb5/articles/dyno-charts You'll see stock is about 120 ftlbs.. There used to be more charts here which showed results from more highly tuned cars.. Cheers Tim Quote Link to post Share on other sites
Peter Cobbold Posted July 3, 2018 Report Share Posted July 3, 2018 (edited) Extraordinary- this calculator says that's a torque of 396 ft-lbs : https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwjl55-XwYHcAhUT77wKHZ2vAY0QFjABegQIABAB&url=http%3A%2F%2Fnepsi.com%2Fresources%2Fcalculators%2Fmotor-torque.htm&usg=AOvVaw1HktBYjWYoyN5cbsUp7JoU 200 lbs-ft I think http://prntscr.com/k1y57j 6psi boost would ideally give 20.7/14.7 or 41 % over atmospheric induciton. But the gas is hotter so the real gain is much lower, around 20-30% depending on temperature. If RR was optimistic the 200 would be lower and closer to the real gain over stock. What matters to me, is the engine drives as if a couple of exra cylinders have been added Peter Edited July 3, 2018 by Peter Cobbold Quote Link to post Share on other sites
Tom Fremont Posted July 3, 2018 Report Share Posted July 3, 2018 201.92 lb-ft in your case, Peter. This is slightly less than proportional to the atmospheric increase factor over the 1 lb-ft per cubic inch of the early carbureted engines. Today's turbo'd engines have amazing low end torque; I first experienced this on European turbid weasels we rent when in Italy. I think this tech trick migrated over to petrol engines later. Used to be that turbo'd engines wouldn't impress until the higher rpm. Now the boost comes in off idle if you want, up to 20 psi on my 2016 Cadillac 2 liter, which claims 295 lb-ft of torque or 2.5 lb-ft per cubic inch, ~ proportional to the atmospheric increase factor if applied to old engines like ours per above. Cheers, Tom Quote Link to post Share on other sites
Peter Cobbold Posted July 3, 2018 Report Share Posted July 3, 2018 (edited) 201.92 lb-ft in your case, Peter. This is slightly less than proportional to the atmospheric increase factor over the 1 lb-ft per cubic inch of the early carbureted engines. Today's turbo'd engines have amazing low end torque; I first experienced this on European turbid weasels we rent when in Italy. I think this tech trick migrated over to petrol engines later. Used to be that turbo'd engines wouldn't impress until the higher rpm. Now the boost comes in off idle if you want, up to 20 psi on my 2016 Cadillac 2 liter, which claims 295 lb-ft of torque or 2.5 lb-ft per cubic inch, ~ proportional to the atmospheric increase factor if applied to old engines like ours per above. Cheers, Tom Tom, Once an intercooler is used to dump the heat then torque propotional to boosted absolute pressure is feasible. But with a carb feeding a 'wet' blower an intercooler is verboten - in an inlet backfire it becomes a grenade. For TRs the only answer if efi and intercooler, eg: http://www.pattonmachine.com/tr6/ Peter Edited July 3, 2018 by Peter Cobbold Quote Link to post Share on other sites
Tom Fremont Posted July 3, 2018 Report Share Posted July 3, 2018 Tom, Once an intercooler is used to dump the heat then torque propotional to boosted absolute pressure is feasible. But with a carb feeding a 'wet' blower an intercooler is verboten - in an inlet backfire it becomes a grenade. For TRs the only answer if efi and intercooler, eg: http://www.pattonmachine.com/tr6/ Peter Yeoman's job, that! I'll never venture there, as KISS is my creed ( Keep It Simple, Stupid! ) and wouldn't be able to hang on with KICK ( Keep It Complicated, Know-it-all! ) Tom Quote Link to post Share on other sites
dblenk Posted July 4, 2018 Author Report Share Posted July 4, 2018 Hi all wasnt too far off thanks for the debate cheers david Quote Link to post Share on other sites
john.r.davies Posted July 4, 2018 Report Share Posted July 4, 2018 Horsepower = (Torque (ft-lbs) x speed)/5252 So, at 5252rpm Bhp = Torque. 200 may be available, some claim 250 plus. But no doubt not without some major mods. John Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.