How accurate is Desktop Dyno 2,000? I've entered in my setup and it says that if i can't my cam i to the 219, that i'll be making alot more power with the S/R Torquers than I would with the Sportsman II's... That seems to go against everything that i'd learned about cars so far. Can someone please set me straight on this?? Here's my setup:
355, World S/R Torquer heads (67cc Chambers, 170cc intake runners, 2.02 1.6 valves) about 10:1, SuperRam base, plenum and runners, 58mm throttle body, Holley AFPR, 30 lbs injectors, 255lph fuel pump, Hooker 1 5/8 headers, custom y-pipe, hooker cat-back, 700r4 with 2200 - 2400 stall, and 3.73's.
A Friend of mine made me a deal to swap to Sportsman II's...and i figured that they would be better for me since i have this giant intake, and decent exhaust.
Desktop Dyno claims that with the S/R's i'll be making 448hp and 489tq....with a great tq curve...at 2,000rpms it says i'll make 482ft.lbs....
With the Sportsmans it says that i'm at, 367hp and 463 tq.
Can someone please set me straight...both of those motors are at 10:1
Please set me straight!!
355, World S/R Torquer heads (67cc Chambers, 170cc intake runners, 2.02 1.6 valves) about 10:1, SuperRam base, plenum and runners, 58mm throttle body, Holley AFPR, 30 lbs injectors, 255lph fuel pump, Hooker 1 5/8 headers, custom y-pipe, hooker cat-back, 700r4 with 2200 - 2400 stall, and 3.73's.
A Friend of mine made me a deal to swap to Sportsman II's...and i figured that they would be better for me since i have this giant intake, and decent exhaust.
Desktop Dyno claims that with the S/R's i'll be making 448hp and 489tq....with a great tq curve...at 2,000rpms it says i'll make 482ft.lbs....
With the Sportsmans it says that i'm at, 367hp and 463 tq.
Can someone please set me straight...both of those motors are at 10:1
Please set me straight!!
Supreme Member
Most likely you have a modified head flow file for the S/R torquers and that is what is throwing desktop dyno off. the sportsman 2's are far better heads, but have them ported and polish, they are rough castings. the s/r's have really weak flow #'s and there is no way sportsman 2's would make less horsepower.
I put in the numbers for the afr190's and they are only a little bit better than the S/R torquers...something isn't right...i really don't understand
here is the site that i've been using http://www.geocities.com/MotorCity/Speedway/5117/flow/
Member
I'm not sure about DD2000, but in the real world if you mismatch parts (putting big heads and a small cam together) you will have a combo that makes NO POWER, NO WHERE in the RPM range.
Perhaps that's what DD2000 is trying to show you? I don't know for sure, but it's just a guess.
Perhaps that's what DD2000 is trying to show you? I don't know for sure, but it's just a guess.
I've been using the LPE 219, 219/219 .560/.560 112lobe sep.
That doesn't seem like a small cam to me. But something doesn't seem rigth that the S/R's are producing as much hp as the afr's...if everyone could do that, why wouldn't people just buy the S/R's instead of taking out a mortgage to get afr's...(i'm just kidding)
If you do think that the cam is too small, could you give me something bigger to try?
When i get back to the computer, i'll post every step that i've been doing and maybe someone will be able to help me, maybe i'm doing something wrong. Thanks!
Justin
That doesn't seem like a small cam to me. But something doesn't seem rigth that the S/R's are producing as much hp as the afr's...if everyone could do that, why wouldn't people just buy the S/R's instead of taking out a mortgage to get afr's...(i'm just kidding)
If you do think that the cam is too small, could you give me something bigger to try?
When i get back to the computer, i'll post every step that i've been doing and maybe someone will be able to help me, maybe i'm doing something wrong. Thanks!
Justin
Member
Well you have to remember that a head with a big intake port doesn't mean it'll flow a lot, and visa versa. But for a 'rule of thumb', remember that small ports are for low RPM, big ports are for high RPM.
That cam you have isn't a 'big' cam. High lift does not make a cam 'big'. Duration means more than anything as well as lobe seperation. Those two things dictate 'overlap'. The overlap of the cam has a huge effect on the usable RPM range. Then there's the intake centerline which also has a huge effect on RPM range.
Nobody can give you all the specifics on what each one does to the other because each one, individually, does not have an effect on the others. They all work together. Jerry ****
EDIT: OMG!!!!! I CAN'T SAY "Jerry **********"???? How ignorant!! This board is getting ignorant!!
wouldn't have been a great receiver if he didn't have great quarterbacks like Joe Montana and Steve Young.
A cam with a duration of 219*@.050" is not considered big. That's a very mild cam. I'll bet it's a roller because of the HUGE lift from that small duration. Only a roller lifter would allow that kind of acceleration angle.
Sportsman II heads are 200cc intake runners right? That may not seem like they're much larger than 170cc, but A LOT of velocity is lost when using a cam with little duration. The Sportsman IIs would be better served with a cam of AT LEAST 230*@.050".
BTW, are you putting 'Roller' under the lifter choice of DD2000? If so, then you need to read the directions.
I know the cam you're gonna use is a roller, but you shouldn't label it as such in that program. Same with the Super Ram. They say that would fall more under Single Plane, or Tunnel-Ram. Here's the text from their instructions.
That cam you have isn't a 'big' cam. High lift does not make a cam 'big'. Duration means more than anything as well as lobe seperation. Those two things dictate 'overlap'. The overlap of the cam has a huge effect on the usable RPM range. Then there's the intake centerline which also has a huge effect on RPM range.
Nobody can give you all the specifics on what each one does to the other because each one, individually, does not have an effect on the others. They all work together. Jerry ****
EDIT: OMG!!!!! I CAN'T SAY "Jerry **********"???? How ignorant!! This board is getting ignorant!!
wouldn't have been a great receiver if he didn't have great quarterbacks like Joe Montana and Steve Young.
A cam with a duration of 219*@.050" is not considered big. That's a very mild cam. I'll bet it's a roller because of the HUGE lift from that small duration. Only a roller lifter would allow that kind of acceleration angle.
Sportsman II heads are 200cc intake runners right? That may not seem like they're much larger than 170cc, but A LOT of velocity is lost when using a cam with little duration. The Sportsman IIs would be better served with a cam of AT LEAST 230*@.050".
BTW, are you putting 'Roller' under the lifter choice of DD2000? If so, then you need to read the directions.
I know the cam you're gonna use is a roller, but you shouldn't label it as such in that program. Same with the Super Ram. They say that would fall more under Single Plane, or Tunnel-Ram. Here's the text from their instructions.