I thought OEM the VVL kicks in at 5100/5600 rpm. Exh/Int.
Cam switch over points
Howzit guys
I would like to know what is the best points at which to have the cams switching. Currently mine is at 4200 rpm and 4500 rpm but after 6500 rpm the power curve starts to straighten and die off at like 7000rpm.
Current setup is:
SR20VE
Stock cams
2.5" exhaust
Branch
Full management
CAI
I would like to know what is the best points at which to have the cams switching. Currently mine is at 4200 rpm and 4500 rpm but after 6500 rpm the power curve starts to straighten and die off at like 7000rpm.
Current setup is:
SR20VE
Stock cams
2.5" exhaust
Branch
Full management
CAI
1 - 14 of 14 Posts
I am also new to the VE thing ,too.I searched a ton here and there,and PMd a few members here to set up my car.I am not trying to tell you this is the best setup,I am just telling you what I did....HOPEFULLY some of the more experience VE owners will chime in on this.Maybe we both can learn more.
I am switching both cams at 4600 based on what I have searched here.I like the way it feels for a dd.From what I understand,the low cams stop making power at around 4600.
Supposedly when you run N1s,you will raise the switchover to like 5600 or so.
I have not dyno tuned my setup yet,but want to asap to play with the switchpoints.
My current setup
Stock cams
VE MAF
calum basic
SSAC
2.5 exhaust
Got a new ASP header ,and 3" exhaust going on soon,and hopefully cams eventually to finish her out.
I am switching both cams at 4600 based on what I have searched here.I like the way it feels for a dd.From what I understand,the low cams stop making power at around 4600.
Supposedly when you run N1s,you will raise the switchover to like 5600 or so.
I have not dyno tuned my setup yet,but want to asap to play with the switchpoints.
My current setup
Stock cams
VE MAF
calum basic
SSAC
2.5 exhaust
Got a new ASP header ,and 3" exhaust going on soon,and hopefully cams eventually to finish her out.
Thanx for the replies so far.
I am currently limiting at 8000 rpm and is that right or should i change it?
I am currently limiting at 8000 rpm and is that right or should i change it?
You are in the ball park with your current switch points. Every car is different, so you really need to dyno your car to figure out what's right (as has been said in the Forums about 100 times). When you dyno, activate the cams way too low and do a run, then activate them way too high an do another run. If you set your cam switching where the power curves cross on these 2 runs, that should give you a smooth power curve.Thanx for the replies so far.
I am currently limiting at 8000 rpm and is that right or should i change it?
You don't need to rev to 8000 ROM with stock cams -- power drops up high, and it's not the safest thing to do. JWT sets their rev limit at 7200 for stock cams, You might be better off at 7500 for now.
Wait until after you install your new header before you dyno to determine cam switchover points. Goodness only knows what effect that monster header will have.
billc agree. There's enough opinion to choke a horse on switching the two cams separately; if you're using one switch for both, 45-4600 seems to be about right. Many switch above 5k but I can't imagine why with the stock cams. VERY definitely no reason to set the limiter above 7500; the hp curve turns about 72-7300.
Yesterday I spent some time on the dyno messing with SR16 cams that I recently installed in my SR20VE. I had intitially set the cams to switch at 5000 and 5400 but found that this created a sginficant drop in power between 4400 and 5000 RPM. So I set the cams to switch at 4300 and 4700 to make a nice smooth power curve.
My dyno chart is posted here:
http://www.sr20-forum.com/vvl/16864-sr20ve-dyno-stock-cams-vs-sr16ve-cams.html
Unfortunately I did not print the graphs that I used to determine the switch points, but it makes a difference where you set them. The car feels better on the road, as well. With the higher switch over points, there was a discernible pause before the first cam popped. Now it's just a long, smooth pull.
Remember, SR16 and SR20 cams will have different switch points.
My dyno chart is posted here:
http://www.sr20-forum.com/vvl/16864-sr20ve-dyno-stock-cams-vs-sr16ve-cams.html
Unfortunately I did not print the graphs that I used to determine the switch points, but it makes a difference where you set them. The car feels better on the road, as well. With the higher switch over points, there was a discernible pause before the first cam popped. Now it's just a long, smooth pull.
Remember, SR16 and SR20 cams will have different switch points.
Thanx for the info guys and i will try switching the cams at 4500 - 4600rpm for both and see the result.
Strange.Yesterday I spent some time on the dyno messing with SR16 cams that I recently installed in my SR20VE. I had intitially set the cams to switch at 5000 and 5400 but found that this created a sginficant drop in power between 4400 and 5000 RPM. So I set the cams to switch at 4300 and 4700 to make a nice smooth power curve.
My dyno chart is posted here:
http://www.sr20-forum.com/vvl/16864-sr20ve-dyno-stock-cams-vs-sr16ve-cams.html
Unfortunately I did not print the graphs that I used to determine the switch points, but it makes a difference where you set them. The car feels better on the road, as well. With the higher switch over points, there was a discernible pause before the first cam popped. Now it's just a long, smooth pull.
Remember, SR16 and SR20 cams will have different switch points.
I dynoed my car and the best power was made at 5100rpm - both cams. My set up was sr20ve motor, sr16ve cams, sr16ve ecu with greddy emanage.
With my calum ecu and sr16ve cams now I wonder if that will need to be changed?
Peace
I've got a questoin as well.
Will be installing the following setup:
SR16VE with DE rods and crank. Everything else stock (Apart from DE MAF). Any thoughts about the switching point, somewhere near a certain number will do, since I need to drive it to the dyno, and reconfigure them as said above
.
Will be installing the following setup:
SR16VE with DE rods and crank. Everything else stock (Apart from DE MAF). Any thoughts about the switching point, somewhere near a certain number will do, since I need to drive it to the dyno, and reconfigure them as said above
.it wont matter where u set them while u drive to the dyno
I'm learning from another thread that the Calum tune that I'm using has a pretty conservative timing map -- especially at WOT for low RPMs (under 5000 RPM) and also at mid load under 2500 RPM). I've been wondering whether when I add timing advance there will be enough of a change in power delivery to move the swithc over points myself. Only time (and dyno time) will tell, but most engines like to switch SR16 cams at higher RPMs than I found.Strange.
I dynoed my car and the best power was made at 5100rpm - both cams. My set up was sr20ve motor, sr16ve cams, sr16ve ecu with greddy emanage.
With my calum ecu and sr16ve cams now I wonder if that will need to be changed?
Peace
........
Change it to 7500, reving to 8k on stock 2.0 cams can lead to valve float. Kick your cams at 4700 and 4800.Thanx for the replies so far.
I am currently limiting at 8000 rpm and is that right or should i change it?
Thanx for the info bro i will def change my rev limiter to 7500rpm.Change it to 7500, reving to 8k on stock 2.0 cams can lead to valve float. Kick your cams at 4700 and 4800.
I will play around with the cams switch over points to 4600 for both and 4700 and 4800 and see wot is the best result on the dyno:biggthump
1 - 14 of 14 Posts
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