Throwing Blower cam "theories"-OUT THE WINDOW!!!!!!!
02-19-2008, 10:50 PM
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Throwing Blower cam "theories"-OUT THE WINDOW!!!!!!! Dave(Sled28 from CDNperf) and I did some "cam" testing this week and the results were interesting.
First off the last combo was a 347, Patriot LS6 CNC heads-stock valves, F1C blower, cam had 58 degrees of overlap. At 4900 we were seeing 11 psi.
Now new combo is a 402, AFR225's, F1A supercharger which flows about 200cfm less and the new cam that has over 81 degrees of overlap. At 4900 we saw 10 psi. And one more thing to note-the blower is spinning about 1000rpm slower right now-testing out some new belt brand and additives with positive results.
By 7000 rpm this "baby" blower should be making right at 18psi-and it's not even being "overspun" yet.
I can only imagine what Frank's 427 with the F1R will be doing?
It's too bad we had some issues with the dyno' but we'll have some numbers soon!
BTW-new cam sounds badass!!!
So what happened to all the boost getting lost with too much overlap?
First off the last combo was a 347, Patriot LS6 CNC heads-stock valves, F1C blower, cam had 58 degrees of overlap. At 4900 we were seeing 11 psi.
Now new combo is a 402, AFR225's, F1A supercharger which flows about 200cfm less and the new cam that has over 81 degrees of overlap. At 4900 we saw 10 psi. And one more thing to note-the blower is spinning about 1000rpm slower right now-testing out some new belt brand and additives with positive results.
By 7000 rpm this "baby" blower should be making right at 18psi-and it's not even being "overspun" yet.
I can only imagine what Frank's 427 with the F1R will be doing?
It's too bad we had some issues with the dyno' but we'll have some numbers soon!
BTW-new cam sounds badass!!!
So what happened to all the boost getting lost with too much overlap?
02-20-2008, 03:21 PM
#5
So you are proposing to make judgements about the effectiveness of cams on a before and after test that includes more cubes, different heads, and a different blower? Your new combo may work fine and indeed it sounds like a monster, but it tells us very little about cam optimization. Were the lobes even from the same family?
I would suspect that you could increase overlap some more and see boost drop. It just blows straight through to the exhaust thereby reducing back pressure in the intake.
I would suspect that you could increase overlap some more and see boost drop. It just blows straight through to the exhaust thereby reducing back pressure in the intake.
03-13-2008, 08:56 PM
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So you are proposing to make judgements about the effectiveness of cams on a before and after test that includes more cubes, different heads, and a different blower? Your new combo may work fine and indeed it sounds like a monster, but it tells us very little about cam optimization. Were the lobes even from the same family?
I would suspect that you could increase overlap some more and see boost drop. It just blows straight through to the exhaust thereby reducing back pressure in the intake.
I would suspect that you could increase overlap some more and see boost drop. It just blows straight through to the exhaust thereby reducing back pressure in the intake.
Dave from CDNPERF installed a new cam -need to kill some torque and make more power-new cam has 65 degrees of overlap 114 centerline-let's see what happens. Monday the F1R get's strapped on!
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03-13-2008, 11:15 PM
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900+rwhp, 900+rwtq, pump gas+meth, through an auto, 112 centerline, 81 degrees of overlap, 18psi with a F1A-so where did the boost go?
Dave from CDNPERF installed a new cam -need to kill some torque and make more power-new cam has 65 degrees of overlap 114 centerline-let's see what happens. Monday the F1R get's strapped on!
Dave from CDNPERF installed a new cam -need to kill some torque and make more power-new cam has 65 degrees of overlap 114 centerline-let's see what happens. Monday the F1R get's strapped on!
03-14-2008, 01:53 AM
#9
The new cam will make less power verywhere important unless it has a lot more exh duration Id bet it might come up better peak. Keeping headunit the same right?
Do you have very good valvesprings and driveability tuning relatively easy for you? If all your looking for is power you should try one of the nitrous cams I have around here, I do them all to kill all the torque I can and make pushrod VTEC lol
Do you have very good valvesprings and driveability tuning relatively easy for you? If all your looking for is power you should try one of the nitrous cams I have around here, I do them all to kill all the torque I can and make pushrod VTEC lol
03-14-2008, 11:29 AM
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BTW, nice set-up.
And whats wrong with that? Itll make more power
Just busting your chops a bit there Jeff.
03-16-2008, 09:33 AM
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The new cam will make less power verywhere important unless it has a lot more exh duration Id bet it might come up better peak. Keeping headunit the same right?
Do you have very good valvesprings and driveability tuning relatively easy for you? If all your looking for is power you should try one of the nitrous cams I have around here, I do them all to kill all the torque I can and make pushrod VTEC lol
Do you have very good valvesprings and driveability tuning relatively easy for you? If all your looking for is power you should try one of the nitrous cams I have around here, I do them all to kill all the torque I can and make pushrod VTEC lol
Where running the AFR 8019's shimmed to 150-160 on the seat(over 400 open), modded stock rockers(HS mod), Morels and lastley I need to get in touch with Manton for a 11/32 pushrod .110 wall-there you have a nice strong, lightweight, stable valvetrain.
Driveabiltiy tuning is fairly easy with the mild stall-just build a new VE/MAF and your done.
What kind of grinds/splits are you using for nitrous cams?
