FP2s or FP2x?

[EvolvingGST]

I am stuck with ordering cams... I am not sure which ones I want to order. I am rebuilding my engine and I have decided from what I have heard and read I want FP cams for the price.

But I don't know if I want the FP2s or FP2x. I am afraid that the springs I have are not strong enough for the FP2xs. I would also like a semi stock idle.

My setup: Ross Pistons, Manley Rods, Manley Springs w/ a Cometic HP Head Gasket. Turbo Set-Up T3/T4 50 Trim with .48 housing, 680cc injectors, 255lph fuel pump, DSMlink

 

[TommyDSM]

I am stuck with ordering cams... I am not sure which ones I want to order. I am rebuilding my engine and I have decided from what I have heard and read I want FP cams for the price.

But I don't know if I want the FP2s or FP2x. I am afraid that the springs I have are not strong enough for the FP2xs. I would also like a semi stock idle.

My setup: Ross Pistons, Manley Rods, Manley Springs w/ a Cometic HP Head Gasket. Turbo Set-Up T3/T4 50 Trim with .48 housing, 680cc injectors, 255lph fuel pump, DSMlink

I'm also in the process of rebuilding. And I went with the FP2x's with FP's Dual Springs.

 

[DGajre777]

Why not call or e-mail FP and ask them if your springs are strong enough for FP2Xs?

 

[TommyDSM]

Why not call or e-mail FP and ask them if your springs are strong enough for FP2Xs?

Their just going to tell you, you can use your stock springs. But you won't be able to rev high... I already did... thats why I went with their springs

 

[ChvyKc]

Why not call or e-mail FP and ask them if your springs are strong enough for FP2Xs?

Don't e-mail them. You will be waiting for at least a week.

Their a great company (I bought my turbo from them) but they take a while to get back to your e-mails. I can imagine that they get a ton everyday, but they are always willing to help over the phone.

Back on topic, I went with the FP2 and love them. I have a pretty much stock idle with those cams and they give power all the way to redline, but I am only running a 16G. I think that you should go with the 2x's so you can benefit from the airflow of that 50 trim. (I need a 50 trim )

 

[chuckdog_5]

i as well went with the fp2x's, did you already order yours, i had to wait quite sometime for mine since they were on back order. anyways, just to play it safe, i went with the si dual valve springs and titanium retainers from slowboy, the fp2s are pretty close the the hks 272s from what i have read, the 2xs are suppose to prove more top end power with a loss on bottom end, so i plan on reving high and blowing the crap out of my transmission.

do a search under my name if you would like about fpx cams, there was a really good thread about it, dsm-onster( i think thats how his name is) knows a lot of info on this subject

 

[EvolvingGST]

Well I have read on NewEngDSM their recommended pressure for the Springs for the X Besides the Manley supposedly no single springs will be good enough.... BUT I wanted to see what you guys think. I am on the verge of just ordering the FP2s just because its better safe than sorry. AND the fact that like ChvyKc said they are like the HKS 272 = proven combo. But As he also said I have a 50trim so I am stuck behind this decision.

I thank everyone for your opinions please keep them coming. I have done a lot of research but I wanted more opinions.

 

[TommyDSM]

I thought with the FP2x you dont loose the lowend like you would with the normal FP2. With my setup I have a 50 Trim, and I went with the x because I didn't want to wait for the spoolup and thought it would make up for the missing lowend...

 

[daren_p]

i as well went with the fp2x's, did you already order yours, i had to wait quite sometime for mine since they were on back order. anyways, just to play it safe, i went with the si dual valve springs and titanium retainers from slowboy, the fp2s are pretty close the the hks 272s from what i have read, the 2xs are suppose to prove more top end power with a loss on bottom end, so i plan on reving high and blowing the crap out of my transmission.

do a search under my name if you would like about fpx cams, there was a really good thread about it, dsm-onster( i think thats how his name is) knows a lot of info on this subject

You have that abit backwards, the origional FP2's will lose some of the low/mid compared to the HKS 272's but have a better top end. The FP2x's take the 2 profile add some extra lift, duration stays the same and the ramp rate is increased (amount of time to open/close the valve is quicker so the valve stays open longer), what this does is keeps/may even add to the top end of the origional 2's but don't lose as much low/mid. FP will recommend their dual springs for the 2x's but there are a few guys on here that run the 2x cams with upgraded single springs that aren't haveing any issues.

 

[TSIMonsteR]

I have even heard of people running the FP1x and FP2x cams with stock springs, just don't expect the rev more then 8000rpms

 

[chuckdog_5]

You have that abit backwards, the origional FP2's will lose some of the low/mid compared to the HKS 272's but have a better top end. The FP2x's take the 2 profile add some extra lift, duration stays the same and the ramp rate is increased (amount of time to open/close the valve is quicker so the valve stays open longer), what this does is keeps/may even add to the top end of the origional 2's but don't lose as much low/mid. FP will recommend their dual springs for the 2x's but there are a few guys on here that run the 2x cams with upgraded single springs that aren't haveing any issues.

my bad........

 

[daren_p]

I have even heard of people running the FP1x and FP2x cams with stock springs, just don't expect the rev more then 8000rpms

I think you are just asking for it running the 2x cams with factory springs. Another member posted that when he talked to FP they said you could run the 1x cams with factory springs (though not recommended) if you kept the rev limit under 7500. I run the 1x cams & didn't want to take a chance even thought I use a 7500 redline, I went with the Crower spring/retainer combo. The 1x have the same lift as the 2's but when you compare the profile to the factory/reg 2's they have a much flatter top ("square shape").

 

[EvolvingGST]

Well everyone I am not running stock springs as I have mentioned. I am running Manley Springs. I am now leaning toward the FP2xs again >.<

 

[ChvyKc]

I have even heard of people running the FP1x and FP2x cams with stock springs, just don't expect the rev more then 8000rpms

I wouldn't do it. I am sure that you MIGHT be able to run those cams with stock springs, but there is not reason to take that chance. If you want the power then spend the money to make it and just upgrade the springs.

I think that the FP2's would be a good cam setup for that 50 trim but the x's would be better. The FP2's are in my opinion a little to big for my turbo. I was going to do FP1/FP2 combo but I plan on going with a bigger turbo very soon so I went ahead and went with the straight FP2's.

 

[TommyDSM]

Well everyone I am not running stock springs as I have mentioned. I am running Manley Springs. I am now leaning toward the FP2xs again >.<

I knew you weren't running stock springs. but are they dual springs? I think thats what people are meaning when they refer to stock springs. Because FP2x's recommend Dual springs. I was planing on runing the single manley springs also. But didn't want to risk it... I mean 7k in a new motor... rather just that whats recommended and knows will work.

 

[EvolvingGST]

Well the SBR says that they have been up to 8500 rpm with the manley springs but I am just concerned about the ramp rate... I would love to have the ramp rate but dont want to blow up the engine either... So thats why I am so undecided... but if you guys dont think I should go with FP2 regulars maybe I should...

 

[1SloColt]

I'm fairly certain manley single springs are the strongest single springs on the market for our cars(if not they are close to it). Dsmonster is running 2x cams with crower singles to +8000rpm without problems.

 

[desolateboosted]

I don't know if this is relevent but I went 8k all day on stock springs and 272s.

 

[2deep]

I'm have FP2x's w/SI duals and take it to 8-8.5K with an FP RED with no problems.

 

[Slowboy]

Well the SBR says that they have been up to 8500 rpm with the manley springs but I am just concerned about the ramp rate... I would love to have the ramp rate but dont want to blow up the engine either... So thats why I am so undecided... but if you guys dont think I should go with FP2 regulars maybe I should...

2.1l motor, comp 101400's, Manley single spring, 9500 RPM's no issue.

Manley and BC single springs work well, but I have no such experience in my own car with BC as of yet!

Mike Huml

 

[EvolvingGST]

Thank you Mike and the rest of the guys for your opinions and experiences. After reading Mike's last post I think I am going FP2xs thanks guys I really appreciate it.

 

[Turbo Monk3y]

I've had both... The fp2s I have with Manley singles work great to 9K The FP2X require the Dual springs because I experienced valve float @ anything above 7600rpms So I sold the Fp2xs to my buddy who has duals and they run nice on his setup... The lobe on the Fp2x is alot more Square than the regualar fp2s... You WILL NEED the Duals to run the Fp2xs.. Forced performance even had to put a REQUIRED on their website because people like me bought them and Could not run them because of the single spring setups...

 

[fourreGsixty3]

Straight off of FPs website>>>FPCam2
Compatible with stock springs. Similar to HKS 272 camshaft, but with a greater emphasis on top end power. Gives up a little bottom end torque to the HKS 272 cam and gains power higher in the RPM band. Nice choice if you need a big camshaft, but cannot install upgraded valve springs.
FPCam2x
Dual valve springs required. This cam needs 280lb of force over the nose of the cam. When using STDuals, you will find that an installed height of 1.470-1.490" is needed. This "x" version of the FPCam2 increases valve acceleration and valve dwell near max lift to increase torque and widen the power band. Similar to the FPCam3 but not specifically designed around the piston speed of 100mm stroke crankshafts.
So there you have it, either go with the FP2s with stock springs or go with the FP2x's, and get dual srping valve train with Ti-retainers.

Dustin

 

[daren_p]

I've had both... The fp2s I have with Manley singles work great to 9K The FP2X require the Dual springs because I experienced valve float @ anything above 7600rpms So I sold the Fp2xs to my buddy who has duals and they run nice on his setup... The lobe on the Fp2x is alot more Square than the regualar fp2s... You WILL NEED the Duals to run the Fp2xs.. Forced performance even had to put a REQUIRED on their website because people like me bought them and Could not run them because of the single spring setups...

Canadiantsi has been running the 2x cams with Manley single springs for quite some time now I believe without any issues. Who's make are your springs? So what happened when you floated the valves/how do you know, did they make contact?

 

[TSIMonsteR]

I think I'll just stick to FP1x or the DKS 264/272 combo. Thats alot of money in the valvetrain! I guess what I am trying to say is, do you really think its worth upgrading the whole valvetrain just to use the 2x cams?