my turbo cam experience
Thread Starter
Joined: Nov 2001
Posts: 7,903
Likes: 1
From: Cleveland, OH
yeah but let granny drive that to the store vs my car...remember, I am talking streetcar like most folks on here have. No one is doubting bigger cam for big power but I was trying to show what the results were for a daily driver.
PSJ...another member already got that cam in a lighter better geared car.
PSJ...another member already got that cam in a lighter better geared car.
Originally Posted by ddnspider
so as long as your intercooled and or alky you can get away with a higher LSA?
Actually a wider LSA will allow more pressure in the cylinder due to the fact that when you widen the lobe centers, you close the intake valve later so as to not build pressure in the cylinder as fast. The amount of intake duration will affect this also. Hope this helps.
Rick
Originally Posted by ddnspider
so then a wider LSA is better,but is it more prone to detonation in the midrange?
Rick
i swear they're some member in another thread throwing around how you dont need a higher lsa and a lower lsa like 112 will bleed off cylinder pressure at midrange so you wont detonation and all kinds of stuff going against everything ive heard and read.
Originally Posted by ddnspider
i swear they're some member in another thread throwing around how you dont need a higher lsa and a lower lsa like 112 will bleed off cylinder pressure at midrange so you wont detonation and all kinds of stuff going against everything ive heard and read.
Rick
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Originally Posted by ddnspider
agreed,what makes more psi and less timing safer,just curious?
Rick
Some cam manufacturers think that we (this section of the board) tend to over generalize about lsa. Some of them feel that we need to focus mostly on the duration.
Some of my recent changes were done to mostly increase the power under the curve. The idea was to bring up the average hp. I went from a 230/236//115 that peaked around 6800 to a 236/246//114 that peaked a little lower, but that made +75rwhp/75rwtq thru most of the power curve.
I'm generalizing now too, but for a lot of folks doing turbos I think that small cams like 220/220 or 225/225 might be just fine. A number of more radical combos are trying to extract every bit of power in the planned power range. They don't really care about peak hp because they care more about having a straight across power curve than a peaky one.
Peak hp is cool but not always the whole story.
Then again if you are M6 on drag radials you want to keep the car streetable so you don't want to make 700rwhp as soon as you hit the converter like me.
Some of my recent changes were done to mostly increase the power under the curve. The idea was to bring up the average hp. I went from a 230/236//115 that peaked around 6800 to a 236/246//114 that peaked a little lower, but that made +75rwhp/75rwtq thru most of the power curve.
I'm generalizing now too, but for a lot of folks doing turbos I think that small cams like 220/220 or 225/225 might be just fine. A number of more radical combos are trying to extract every bit of power in the planned power range. They don't really care about peak hp because they care more about having a straight across power curve than a peaky one.
Peak hp is cool but not always the whole story.
Then again if you are M6 on drag radials you want to keep the car streetable so you don't want to make 700rwhp as soon as you hit the converter like me.
Originally Posted by Pro Stock John
Some cam manufacturers think that we (this section of the board) tend to over generalize about lsa. Some of them feel that we need to focus mostly on the duration.
Some of my recent changes were done to mostly increase the power under the curve. The idea was to bring up the average hp. I went from a 230/236//115 that peaked around 6800 to a 236/246//114 that peaked a little lower, but that made +75rwhp/75rwtq thru most of the power curve.
I'm generalizing now too, but for a lot of folks doing turbos I think that small cams like 220/220 or 225/225 might be just fine. A number of more radical combos are trying to extract every bit of power in the planned power range. They don't really care about peak hp because they care more about having a straight across power curve than a peaky one.
Peak hp is cool but not always the whole story.
Then again if you are M6 on drag radials you want to keep the car streetable so you don't want to make 700rwhp as soon as you hit the converter like me.
Some of my recent changes were done to mostly increase the power under the curve. The idea was to bring up the average hp. I went from a 230/236//115 that peaked around 6800 to a 236/246//114 that peaked a little lower, but that made +75rwhp/75rwtq thru most of the power curve.
I'm generalizing now too, but for a lot of folks doing turbos I think that small cams like 220/220 or 225/225 might be just fine. A number of more radical combos are trying to extract every bit of power in the planned power range. They don't really care about peak hp because they care more about having a straight across power curve than a peaky one.
Peak hp is cool but not always the whole story.
Then again if you are M6 on drag radials you want to keep the car streetable so you don't want to make 700rwhp as soon as you hit the converter like me.
Rick
My post was full of generalizations, and frankly I think that folks just need to be clear as to what they are building. Cablebandit is looking for total streetability, and was not convinced that the bigger cam worked. I'm not sure what his car did differently off the line so I'm not sure what his conclusions are regarding ET. Seemed like it was 1.58.-1.62 with all the cams, but I"m not sure. Maybe he can elaborate a bit more.
For those that are interested, attached is a copy of the numbers from the sheet that I got from W2W on the power my motor made with the cam specs that I listed...I had to punch the numbers into Excel since I didn't have a scanner handy.
Again, this was with a 94mm turbo...should be interesting to see how the numbers change with the much smaller Incon twins (which is what this cam was spec'd for). I bet I make peak TQ a hell of a lot earlier...LOL.
Again, this was with a 94mm turbo...should be interesting to see how the numbers change with the much smaller Incon twins (which is what this cam was spec'd for). I bet I make peak TQ a hell of a lot earlier...LOL.
Last edited by Phate; Apr 15, 2005 at 09:38 AM.
Well..... Duration makes power. Bigger cams make more power than smaller cams. But idle quality, driveability, and surging become issues with big cams.
I might use a 2002+ LS6 cam for a blower setup, but only if the cam was uber cheap. Otherwise I'd probably look at a 224/227 blower cam from Thunder Racing, or something like that.
I might use a 2002+ LS6 cam for a blower setup, but only if the cam was uber cheap. Otherwise I'd probably look at a 224/227 blower cam from Thunder Racing, or something like that.
