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I tried to do some tuning on desktop dyno today, lol. The program is pretty accurate but I dont know all the VE specs so I couldnt get a proper dyno plot. Anybody else wanna try? I can email u the program. When I changed the stock cam specs to 16VE cam specs, hp went up by about 10.
Note of course that there is no program currently that can simulate dual lobe cams, right?
YOu can either enter the low cam parameters OR the high cam parameters and get a dyno-plot. Both of those would be wrong in their respective ends of the RPM range and in the transition phase.
To what ever extent this program could correctly simulate your car why couldn't you do it for the low profile cam and then high profile then find out where, on paper, the best place for the switch is?
To what ever extent this program could correctly simulate your car why couldn't you do it for the low profile cam and then high profile then find out where, on paper, the best place for the switch is?
you can do that. There is a function that allows you to overlay several maps.
you can do that. There is a function that allows you to overlay several maps.
The problem is that those programs are not accurate at all at the ends of the RPM range.
If you check the curves on the picture posted above, you will se what I mean. So, the utility would be marginal at most.
I'll do one shortly and post it but do not expect any reasonable info from it.
What might be interesting but complicated and not sure to produce anything would be to test the combinations as Nissan originally did it:
IN-LOW + EXH LOW
IN-HI + EXH LOW
IN-HI + EXH HI
To what ever extent this program could correctly simulate your car why couldn't you do it for the low profile cam and then high profile then find out where, on paper, the best place for the switch is?
If you really want to see what the best place for YOU to switch the cams at, its very simple. You do three dyno runs. One without the cams activating, one with just the intake activated, and the third with both activated. Just look at where they cross, and thats the best place to switch your cams.
If you really want to see what the best place for YOU to switch the cams at, its very simple. You do three dyno runs. One without the cams activating, one with just the intake activated, and the third with both activated. Just look at where they cross, and thats the best place to switch your cams.
Well, any input ?
According to the crude graphs shown above opening both at 3500rpm would do the trick. Highly inprobable. If any VE soul is game, please try opening them at 3500rpm and see what will happen!
According to the crude graphs shown above opening both at 3500rpm would do the trick. Highly inprobable. If any VE soul is game, please try opening them at 3500rpm and see what will happen!
Chris
Would something terrible happen? Reason I ask is because I was going to figure out my switching points exactly as described. I doubt ill set them to switch over that low while im testing, but still.
I think that your graph there illustrates how inaccurate programs can be sometimes.
Would something terrible happen? Reason I ask is because I was going to figure out my switching points exactly as described. I doubt ill set them to switch over that low while im testing, but still.
I think that your graph there illustrates how inaccurate programs can be sometimes.
Nothing terrible at all. And please, try them that low when testing.
Programs like HoneDyno or whatever, are be definition innacurate, I said that earlier if you check the posts.
Why? Lots of problems. The cannot in any sense simulate the actual head/port configuration, header design, wave tuning and performance, possible intakewavew tuning effects, etc. And so on....
Other than that they are great!!! Now, if anyone had actual airflow data from a flow bench for either a DE head or a VE head this would be GREAT!!!
