2000^C5

I know these cam will be similiar but I want to make the right choice none the less. car will be mostly street driven and will have CNC heads done at the same time.
Car is a A4 with 3.42s and a SY 3500. I will will LS1 Edit to tune it.
Which cam would you pick and why?

Patrick G

iTrader: (14)

Flip a coin. The TR224/224 actually specs out a hair bigger than the advertised numbers and the XE-R lobes have been measured to be a little smaller than advertised. The difference in total area under the curve is less than 2% between the 2 cams. What that means is you will find very little horsepower difference between the two.

The XE-R lobes are going to be harder on valve springs, requiring more frequent replacement, and will have a more notable underhood valve clatter because of the faster ramps. The hard core racer will take the added steps in beefing up the valvetrain to accomodate the issues with the XE-R lobes. The gain is possibly a few more ponies. That's why I say flip a coin. Hard core: Go XE-R. Daily driver: Go TR224.

2000^C5

Thanks Patrick, that is the info I was looking for.

Rather than having to change the springs more ofthen, I will just stick to the TR224 because the 2 cams will be very close in performance anyways.

Am I right? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

VINCE

iTrader: (1)

The wear of the springs depends on what springs you go with.. Going with the single and you will for sure have to change them. Going dual you will have better life, but make sure you use Comp 987 and the proper retainers.. The research behind the TR224 is more reliable for a street setup.. Thunder was thinking about the customer.. XE-R lobes are really made for the racer who is willing to go the extra mile and put the dual springs in.. My next setup is going to be the XE-R secondary to I already have dual springs.. If I were going single then it would be the TR224...

2000^C5

With the TR and single would I still have to change them once a year or so or would I be good to go without worrying about them?

VINCE

iTrader: (1)

I would think you would be good to go with 918's with the TR224 cam.. The person to ask would be Jason99TA.. I think most of the GTP heads come with 918's with the TR224 combo unless you request dual springs..

VINCE

iTrader: (1)

Its all in how often you run the car hard as well. I ran 941's for 10000 hard and never had an issue.. 918's have shown to be stronger so I would assume you could run them for a lot longer w/out any issues.. I even had my 941's tested recently and they are still good.. Only a 1lb off original specs..

Jason99T/A

iTrader: (21)

If you run the Comp 918s/TR224 combo and race the car pretty often, I would replace the springs once per year to be on the safe side. You could probably get away with longer than that, but I wouldn't push it.

The Comp 918s/Ti. retainer setup has been good up to 6800 all day long in my car.

99 Black Bird T/A

iTrader: (4)

Any new thoughts on this?

Hardtop

iTrader: (3)

I've got the XER 224/112/581 cam in my car. What Patick said about valve train noise is true. I kind of like the sound but that's just me. Its a great cam and so is the Thunder 224. A friend made 399.6 rwhp with stock heads and the XER cam. My car idles at 800 rpm just fine. I've got the 987 springs on my TEA stage 2 4.8 heads. Still working on my setup but my car runs well. See sig. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Bruce

xaon

iTrader: (12)

I ended up going with the 224 XE-R only because I got a killer price on it. I had every intention of getting the TR224 (mostly because I've done tons of business with them and they've done me good every time) before I found the deal on the XE-R.

If I were to do it all over again, I would've ended up going with the TR230/224 instead though. That's mostly just because I want a little more lope. (not that the 224 XE-R on 112LSA doesn't have a pretty nice lope already).