Using Dom's custom cam shop, I had my 2.5L SVT cams reground for my Hybrid 3.0L. Unlike the 3.0L cams, the 2.5L cams were completely reground. These cams were designed with the COMPLETE 2.5L Intake system INCLUDING the IMRC. Lift was added for better breathing to the same specs as the 3.0Ls. Duration and phase was altered however on the intake lobes. These cams are a prototype just to remind you. We had no idea how these cams were going to perform since it's a complete reprofile of the cam unlike the 3.0L cams.
What I was looking for
An overall increase in torque throughout the mid-range. That's what I felt was lacking in my car and with the SVT cams. That was my goal first and foremost, to improve torque. I also wanted to get rid of the dreadful dip in torque that occurs right when the secondaries open. I could hear and feel a significant loss in torque when the IMRC was opening. Before numbers were 200 TQ, 224 HP and after numbers are 206 TQ, 227 HP. However, peak numbers do not tell the whole story.
The reprofiled cams allowed for better tuning in the IMRC dead range, where I picked up 20+ TQ. I also had a catalytic converter that was pretty much shot. It may have affected things minutely. Not a lot of duration was added because I wanted to keep these cams streetable. I'm not interested in revving my engine past 6750 rpms as any gains past that point really are minimal in my opinion. I also don't visit that rpm range a lot and I'm not interested in blowing up engines.
Noticeable improvements: Understand that tuning also affects how these cams perform!
It has attitude! Especially at idle.
Nice smooth and flatter torque curve
Revs smoothly under acceleration
Quieter when not under acceleration (>25% throttle)
It gets a bit squirrley in the higher rpm range (5500+ rpms)
Idles at 930 rpms - will not hold idle at 730 rpms (with Fidanza flywheel, dunno if this is affecting it).
Loss in very low end torque (2k-2.5k rpm range)
The cams won't turn your car into a Lambo
Custom Cold Air Intake
Maximum Extrude Honed ST200 (SVT style) UIM
SVT ('01+ Cougar) LIM
24 lb Taurus Split Port 3L Injectors
SVT heads with 3L valves retrofitted and 3-4 angle valve job (IIRC on the valve work)
MSDS Headers with ****ty MSDS Y-pipe
Custom 2.5 in exhaust with high flow mufflers and high flow cat
3.83 Final Drive with Quaife Torque biasing/LSD/whatever the hell it's technically called
Before WITHOUT CUSTOM CAMS
You can see where the gains in torque have occurred, right in the mid range. The torque curve is flatter and not as peaky.
For those interested Dom (Buckeyesvt) may head up a Group Buy at some point in the future for those that are interested.
Will this work on 2.5Ls?
It should. It's designed for the COMPLETE 2.5L Intake system.
Will this work on Split to Oval Port (Ported) 3Ls?
Again, it should work. Should. However, understand that these cams were designed for a fully functioning 2.5L Intake system INCLUDING A FUNCTIONING IMRC. I have no idea what will happen with low range torque with a defeated IMRC.
Again, given enough interest Buckeyesvt may start a group buy. The good news is that any 2.5L cams will work as they do not have to be SVT cams.