FP2x ----> BC280???

[2deep]

I'm wanting to know if anyone has gone from FP2x cams over to BC 280's? Do you think there will be much to gain in the swap? I've recently read that the 'x' series of cams aren't so rev friendly, and I do like to rev. Any info will be appreciated. Thanks

 

[dsm-onster]

'You've read' ? Have you experienced a drop off in power at your desired rev limit? Mine love 8500+ rpms. Where do you want to go? You'll need an intake manifold upgrade before a cam upgrade at the level where the fp2X cams shine. You're still running a stock intake mani and questioning your cam potential! ???

 

[nanokpsi]

'You've read' ? Have you experienced a drop off in power at your desired rev limit? Mine love 8500+ rpms. Where do you want to go? You'll need an intake manifold upgrade before a cam upgrade at the level where the fp2X cams shine. You're still running a stock intake mani and questioning your cam potential! ???

I think a lot of the conern comes from revving the really agressive cams past 9k because of valvetrain concerns. I would contact fp and let them tell you what a solid redline would be aith yopur application and your installed spring height.

 

[2deep]

'You've read' ? Have you experienced a drop off in power at your desired rev limit? Mine love 8500+ rpms. Where do you want to go? You'll need an intake manifold upgrade before a cam upgrade at the level where the fp2X cams shine. You're still running a stock intake mani and questioning your cam potential! ???

What I read was a messege directly from Robert @ FP, so ya, I'll take his word on it!

I don't frequent the site anymore, so I'm guessing my profile hasn't been updated in a couple of years. So with that being said I do have a JMF smim and I'm running a DBB T67 so I'm looking to maximize my set-up up top!


Thanks Nathan, thats a good suggestion.

EDIT: my profile was updated, so I'm not sure what made you think I was on a stock intake manifold. Please take the time to look at my profile first before jumping to conclusions and making comments like "You're still running a stock intake mani and questioning your cam potential! ???" I've seen more airflow than your 60-1 is rated for, like I said, I'm just trying to maximize my set-up up-top!

 

[dsm-onster]

I certainly do check profiles. I always do. The profile I saw showed no manifold upgrades. I was responding to several threads. It is entirely possible that I could have looked at another's profile and responded to your thread. This is what I get for helping too many people at once.

The BC 280s have more intake lift and less exhaust lift than the fp2x (see here). This is not ideal for a properly matched turbine/compressor combination. One can 'get away with' less intake lift where the cylinder is better exhausted (more exhaust lift and less exhaust back pressure). Of course (and I know you know), a properly chosen turbine will flow the airflow goal w/ as little backpressure as possible while spooling as quick as tolerable. So there is more room in the cylinder for aircharge. Thus more aircharge is encouraged to flow at a lower intake valve lift. A higher lifting exhaust valve helps spool by guaranteeing the most exhaust gasses can strike the turbine blades. Spool time may not be a primary concern but a higher exaust lift increases flow AND spool speed significantly. Of any place to be generous w/ the lift, the exhaust more responsive, to a point .

But, the lift characteristics may be entirely neglidgible and is quite 'setup-specific'. The duration is 6 degrees at the intake and 3 degrees at the exhaust. This does not lend to much better exhaust blow-down in the higher revs. A little better. But, enough for the high flow the 6 more degrees will yield at 6K+? I SUSPECT not likely. I do not know the lobe centerlines for these BC cams nor the ramp rate, but overlap is nearly as significant as duration (to a point). I would request a BC 280 cam card and study the differences between the fp2X card. The overlap may be generous enough to compensate. Go get us the overlap value (or at least the ramp rates and centerlines), and we can give you an educated guess on your investment.

Have you read: http://www.dsmtuners.com/forums/showthread.php?t=248165&highlight=cam+specs. The two threads I've posted came easy in a search .

EDIT: To those who think this is bench racing: If you want "prove it" answers, then there's no need for cam cards. . . Just take the maufacturer's word for it. And go for it. Or wait for reviews of someone who does.

 

[2deep]

Thanks for the info

 

[dsm-onster]

I have to edit my previous post. I looked at the FP profile graph backwards instead of pulling out my cam card. The BC 280 intake cam has .009 (not much) more lift than the fp2X intake. And the BC 280 exhaust has .016 more than the intake. This makes the BC 280s seam even more desirable .

 

[2deep]

I'm just unsure what to think of eclipsegsx1736's findings when comparing the BC280's to the normal FP2s, found on the 11th page, post #330 According to his logs, he had an overall higher airflow/rev with the fp2's over the BC280's. Not to mention a higher peak in airflow.

The reason I am even thinking of a cam change is because a local forum member is willing to trade for my FP2x's. He said the BC280s felt sluggish and was looking to regain some lost torque through-out the power band. Me personally, I could care less about my low-mid range power, as I don't drive hard on the street at all! As long as it pulls hard from 5-9K, I'm a happy camper!

 

[dsm-onster]

I'm just unsure what to think of eclipsegsx1736's findings when comparing the BC280's to the normal FP2s, found on the 11th page, post #330 According to his logs, he had an overall higher airflow/rev with the fp2's over the BC280's. Not to mention a higher peak in airflow.

The reason I am even thinking of a cam change is because a local forum member is willing to trade for my FP2x's. He said the BC280s felt sluggish and was looking to regain some lost torque through-out the power band. Me personally, I could care less about my low-mid range power, as I don't drive hard on the street at all! As long as it pulls hard from 5-9K, I'm a happy camper!

I'm glad that you don't drive hard on the street. A 'real man' takes it to the track.

eclipsegsx1736 never took his settup beyond 7800 rpms. As well, we don't know the altitude and/or the intake temperature of each pull (he runs a MAFT). This could drastically alter the airflow value. . .

It's likely that the 280s flow about the same as fp2xs at 5K up and peak out higher than them at 8.5K+ .

 

[90laserRSfwd]

to the OP, you should look into BC 288's if your looking to make a major difference from your FP 2x's.. just my 2 cents bro