Finally, Dyno Results on 235/240 Cam!
04-16-2005, 10:11 PM
#1
Finally, Dyno Results on 235/240 Cam! Just dynoed today. The car put down 430.7 rwhp @ 6400 rpm, 397.5 ft-lbs torque @ 4900 rpm running through a Moser 9" with 4.11's. It was still putting out over 400 hp at my new 7000 rpm rev limit. Ambient temperature 71*F. I'm pleased! This is on home-ported heads with stock valves, QTP 1.75" headers dumping into a 3" Y with 4" output, ending just before the axle. Just thought I would post up because not many have this cam yet: TSP 235/240 .602/.598 112+2
Last edited by Cal; 04-16-2005 at 10:33 PM.
04-16-2005, 10:29 PM
#3
Thanks! I'm going to the quarter mile track next weekend, if all goes well. Here's a link to the dyno chart in the dyno section:
https://ls1tech.com/forums/dynamometer-results-comparisons/307412-dyno-chart-tsp235-240-cam.html
https://ls1tech.com/forums/dynamometer-results-comparisons/307412-dyno-chart-tsp235-240-cam.html
. you never did dyno the tr224 did you? i would of really like to see the overlay, especially 2k - 5k. 
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04-18-2005, 12:04 AM
#9
Thanks, guys, I was pleasantly surprised with the results, especially with my home-ported heads.
TSP said the cam would not fit if the heads had been milled at all, so I assume it is close. I would not be above flycutting if I ever had to, though. My buddy did his flycutting by hand with a die grinder.
JRP, yeah I screwed up by not getting a dyno on the TR224. I was planning on doing it, but then that f'in lifter turned and trashed the cam. Most people seem to get about 370 rwhp with the TR224 as I'm sure you know. Another guy with a car exactly like mine but totally stock, put down 305 rwhp right before me. As for SOP feel, I would say from 900 to 1200 this cam has way less torque than the TR224. From 1200 to 2800 rpm, it has the same torque, but it runs rough between 1000 and 2000 rpm. From 3000 to 4000, you can feel the power come on, where you did not with the TR224. From 4000 up to my 7000 rpm rev limit, the difference is very dramatic. It revs quicker, makes more noise, and pulls a lot harder. Above 6500 where I normally shift, the tach is now useless, so I had to get a shift light.
TSP said the cam would not fit if the heads had been milled at all, so I assume it is close. I would not be above flycutting if I ever had to, though. My buddy did his flycutting by hand with a die grinder.
JRP, yeah I screwed up by not getting a dyno on the TR224. I was planning on doing it, but then that f'in lifter turned and trashed the cam. Most people seem to get about 370 rwhp with the TR224 as I'm sure you know. Another guy with a car exactly like mine but totally stock, put down 305 rwhp right before me. As for SOP feel, I would say from 900 to 1200 this cam has way less torque than the TR224. From 1200 to 2800 rpm, it has the same torque, but it runs rough between 1000 and 2000 rpm. From 3000 to 4000, you can feel the power come on, where you did not with the TR224. From 4000 up to my 7000 rpm rev limit, the difference is very dramatic. It revs quicker, makes more noise, and pulls a lot harder. Above 6500 where I normally shift, the tach is now useless, so I had to get a shift light.
04-18-2005, 01:27 PM
#15
I really wasn't planning on porting the heads, just had them off to replace a bad lifter, then I said "what the hell." So I didn't get any flow numbers or port volumes. Just bead blasted the carbon out, then removed the rocker bolt bulge and about 80% of the swirl ramps. I blended the valve seats into the bowels, tapered the valve guides, and just did a general clean up and smoothing. Nothing radical. I should have milled them while they were off, but didn't really have time for that or installing bigger valves either. So that leaves some stuff to do next time I tear down the motor.
04-20-2005, 11:53 PM
#17
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Great numbers Cal! Almost makes me want to swap out my 'little' 240/244 for something bigger. If I think back far enough, I can actually remember when you did the 9" several years ago. Wow I'm getting old.
04-21-2005, 04:05 PM
#20
Hmmm, I don't know. One thing I learned, is porting is a hellva lot of work . . . you've got 16 ports, and each has maybe 10 surfaces you need to grind, smooth, then maybe grind again, then polish if it's an exhaust port. So thats about 240 operations, all the time using soap or WD40 to keep the bur from clogging with aluminum. My garage had aluminum chips and dust everywhere when I was done. Plus there's sand blasting out the carbon before you start, big valves to fit, and milling for compression . . . I can see why ported heads are expensive.