Discussion
Just been down to Austec to have some work done and put it on the rollers at the same time. Completely standard 4.0 Griff, although it does have '250' on the plenum, which according to the bible means that it came with gas flowed heads giving an extra 10 hp (or someone has just removed the old one and stuck that one on!). It has 58k miles and as far as I can see, it is on the original cam.
The figure at the flywheel (no wheel figure that I can see), corrected for intake temperature is 227 hp and 287 ft lbs of torque. Without being corrected for intake temperature, the HP figure drops to 217 and the torque to 274. I have a miss fire on one cylinder at about 5000 rpm but I think its all over by then anyway. Hopefully a genuine Lucas distributor and rotor arm might help that.
Anyway, for all the reasons on these forums, it is pretty much impossible to compare like with like but your 190 at the wheels sounds pretty solid. The bit I am most chuffed with on mine is the torque. 270-280 is far better than I thought.
Interestingly, when I took by first car a 4.3BV to the Austec rollers, completely factory standard apart from a 500 de-catted manifold, it was making 239 hp and about 280 lb ft of torque, again at the flywheel. However, with decent act pre-cat exhausts, carbon trumpets, induction sorted etc etc, it was more like 275 and over 300 torques.
I actually think that the effect of an efficient exhaust is under estimated. The biggest single improvement on my old car was ditching the old 500 exhaust and fitting the act pre-cat manifolds with the smaller primaries.
Cant't seem to upload the pdf RR printouts, keep getting 'Upload Failed. Unable to get image info - Check that file is an image. Go back and try again' any ideas?
Peter
The figure at the flywheel (no wheel figure that I can see), corrected for intake temperature is 227 hp and 287 ft lbs of torque. Without being corrected for intake temperature, the HP figure drops to 217 and the torque to 274. I have a miss fire on one cylinder at about 5000 rpm but I think its all over by then anyway. Hopefully a genuine Lucas distributor and rotor arm might help that.
Anyway, for all the reasons on these forums, it is pretty much impossible to compare like with like but your 190 at the wheels sounds pretty solid. The bit I am most chuffed with on mine is the torque. 270-280 is far better than I thought.
Interestingly, when I took by first car a 4.3BV to the Austec rollers, completely factory standard apart from a 500 de-catted manifold, it was making 239 hp and about 280 lb ft of torque, again at the flywheel. However, with decent act pre-cat exhausts, carbon trumpets, induction sorted etc etc, it was more like 275 and over 300 torques.
I actually think that the effect of an efficient exhaust is under estimated. The biggest single improvement on my old car was ditching the old 500 exhaust and fitting the act pre-cat manifolds with the smaller primaries.
Cant't seem to upload the pdf RR printouts, keep getting 'Upload Failed. Unable to get image info - Check that file is an image. Go back and try again' any ideas?
PeterRussell Mc said:
Is that amount of torque normal for a 4.0?
I must admit I was expecting 250-260 and about 220 for the hp. This is of course at the flywheel I would think that the hp at the wheels figure would be more like 170 maybe less. Its all a bit hypothetical, I just wanted to have a base line on one machine to see what works and what doesn't.Any idea why it doesn't seem to want to upload a pdf, I will post up the print out.
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