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Why use a reverse split Cam?

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Old 11-05-2005, 06:17 PM
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Originally Posted by Geoff
I will work on that comparison. You have been on this board long enough to know a little something about valve events. Bottom line is that if you look at the amount of overlap and where it is in relationship to TDC, our 230/236 will definitely make more PEAK power, but not necessarily more area under the curve. Again based on past testing either of these cams could be either forward or reverse split and basically do the same as they are already doing. EVERY internet 'expert' knows the reverse split 'doesn't work' so we made this one a forward split. IMHO the exhaust opening point is probably the least sensitive parameter for a properly tuned header system on a street motor. Your mileage may vary, J/K .
Fair enough. When seeing nothing but the .050" numbers it is hard to compare one cam to the next. With as many lobes as you guys use, it's hard to even guesstimate which lobe you ground it on. Even then, if you moving VE's to make the cam do certain things, then that might not even help. It is nice to know what the intensions behind the cam are. Maybe now I can quit being so "harsh" on it.
Old 11-05-2005, 06:58 PM
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Originally Posted by Geoff
I will work on that comparison. You have been on this board long enough to know a little something about valve events. Bottom line is that if you look at the amount of overlap and where it is in relationship to TDC, our 230/236 will definitely make more PEAK power, but not necessarily more area under the curve. Again based on past testing either of these cams could be either forward or reverse split and basically do the same as they are already doing. EVERY internet 'expert' knows the reverse split 'doesn't work' so we made this one a forward split. IMHO the exhaust opening point is probably the least sensitive parameter for a properly tuned header system on a street motor. Your mileage may vary, J/K .

Didn't you get the memo??? Peak power is all that matters!
Old 11-05-2005, 07:00 PM
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Originally Posted by dubs6
TXhorns281 cam only TR230 full bolt on. once again flat as a 13 yr old.
https://webspace.utexas.edu/wl333/lastdyno.jpg
man that is one sweet graph
Old 11-06-2005, 02:11 PM
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I've been really looking at this cam too, along with the MTI X1 cam. This thread has answered many of my questions! I see the graphs and all....like others said it doesn't make hardly any Hp/Tq difference from stock till the higher rpm's. Maybe i'm too greedy but I want a cam that makes a better low and mid Hp/Tq and still have good high Hp/Tq numbers. I'm looking for 400+ rwhp. I will get a tune!!

FYI...just looking now because I stilll need to get other mods like headers/ory and all the goodies to swap a cam....springs, pushrods...ect.
Old 11-06-2005, 03:28 PM
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Originally Posted by Beast96Z
I'm sure it does. You did gain more power than a stock cam, but your still not pushing what you could down low. I'm sure you saw the graph above. A little more power, but not much of nothing compared to a traditional split cam. Look at this graph comparing the TR224, the TR 227/224, and the TR 230/224. All of the graphs are the same until 5k or so. There's no reason not to gain low-end power when swapping cams. The reverse cams just hender the exaust to a point to where they can't move enough air, thus not making any more power that it's smaller counter parts.
but the car with the tr224 cam also has heads the bigger camed cars are cam only..... if i can do it with cam only thats what i would do
Old 11-06-2005, 04:00 PM
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Ok, if you don't give up any bottom end, pull pull more in high rpms, how is that a bad thing??? i will put together a little comparison b/w my stockish dyno and cam only dyno, give me some time...

You pick the right reverse split cam, and it'll make you happy....
Old 11-06-2005, 08:06 PM
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No pickup down low?

Red = Borla, free mods, lid
Blue = Full bolt on
Black = TR230 on w/ 853s

All were tuned pulls, all were SAE #s, all were previous dynos of mine

Old 11-06-2005, 08:30 PM
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stop flexin your skills on the internet
Old 11-06-2005, 08:47 PM
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Originally Posted by stang killer
stop flexin your skills on the internet
I so rarely care to do it, but there's a time and a place...
Old 11-06-2005, 11:51 PM
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Originally Posted by 02ls1ta
but the car with the tr224 cam also has heads the bigger camed cars are cam only..... if i can do it with cam only thats what i would do
Not true. The graph I posted has only "stock headed" cars. I never said you guys wouldn't gain low-end power, I just stated that it never gained any over a 224 cam. I still believe that a cam of the similar intake duration, split foward, would make more low-end power over the 224 cam. Take it FWIW guys. It's JMO. All the graphs posted have nice curves and seem to be making great power. It's up to you to decide if you feel that there is power left on the table. Geoff explained the purpose of the cam, and it seems to be doing what it is supposed to.
Old 11-07-2005, 05:26 AM
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I will post my graph soon, and then you can find out that the big duration is gonna hurt down low, and will make power past what I want to spin the bottom end.
Old 11-07-2005, 04:57 PM
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Originally Posted by orangeapeel
I will post my graph soon, and then you can find out that the big duration is gonna hurt down low, and will make power past what I want to spin the bottom end.
That's understandable. You put a cam in there that's big enough to feed a 408. I'm talking a 230/224 vs a 230/236. Same intake duration, same lobe, same car, same mods. One foward, one reverse. I asked Geoff if he could overlay some graphs of the 2 cams. This will be the best way to see the diffrences.
Old 11-07-2005, 09:19 PM
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[QUOTE=txhorns281]

Red = Borla, free mods, lid
Blue = Full bolt on
Black = TR230 on w/ 853s

All were tuned pulls, all were SAE #s, all were previous dynos of mine


Were the 853's not on the previous combos? Any advantage to them?
Old 11-07-2005, 10:37 PM
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[QUOTE=krexken]
Originally Posted by txhorns281

Red = Borla, free mods, lid
Blue = Full bolt on
Black = TR230 on w/ 853s

All were tuned pulls, all were SAE #s, all were previous dynos of mine


Were the 853's not on the previous combos? Any advantage to them?
??? Still a stock headed car, that was the point of mentioning the 853s
Old 11-08-2005, 12:22 AM
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my friend has a custom grind i believe TSP did it and I also believe it was on XER lobes, its a 232/228 573/571 113, he never had it dynoed but it ran 11.2@120. I now have this cam sitting in my closet waiting to go in. To me its not about dyno #s its the e.t Love the reverse split!
Old 11-08-2005, 12:55 AM
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Originally Posted by BrianC98Z28
my friend has a custom grind i believe TSP did it and I also believe it was on XER lobes, its a 232/228 573/571 113, he never had it dynoed but it ran 11.2@120. I now have this cam sitting in my closet waiting to go in. To me its not about dyno #s its the e.t Love the reverse split!
What kind of heads does your buddy have? Those are very nice times



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