Hi guys,

I currently have LS1 Cheater cam installed on my C6. With other mods and minor tuning my A4 made 421 RWHP. What sort of additional HP should I expect if I changed the cam to LS2 Cheater?

 

These are different specs? I would assume no change=same cam

 

should be the same specs, so no change

 

the spec difference is to take advantage of the LS2 heads and increased displacement. Therefore, I think you wouldn't gain anything. However, I am not a cam guru. In fact, I wanted to know what you thought of the Cheatr cam. How is it on the low end? How is the valve train noise? How bad did it hit your mileage?

 

The LS2 is almost identical, not worth the effort for 5hp. I spoke with Patrick and he has designed me a FI cam very similar to the cheater, 214/228 .600 .588 117 +1 LSA. The low in. duration will be awesome for low end hp & tq. and the .600 lift allows the FI air to get in quickly, and the valve closes quickly to keep a high DCR and low overlap.

 

What other mods do you have? Are you running a higher stall?

 

Are u talking about the new Cheater cam?

 

Patrick did a fantastic job. Those are great cam specs, you'll love that cam at all RPMs!

One concern comes to mind though...the .600" lift on the intake side is a lot of lift for 214 degrees duration. While .600" lift is seen often, it's typically accompanied with much more than 214 degrees duration. The acceleration/deceleration rates will be quite high and aggravated by the larger/heavier intake valve (in comparison with the exhaust valve). Don't get me wrong, I completely agree with the philosophy of more intake lift than exhaust. Once you reach a certain lift number (around .500"), you get much more gains in flow on the intake side than the exhaust side with any more increases in lift due to the differences in valve diameter. Flow through a valve begins to stall (stops increasing) when lift reaches 25% of valve diameter. So if you have a 2.00" diameter valve, then you'll see nice gains in flow for each .050" lift up to .500" lift. I'm not saying you'll see no additional gains after .500" lift, just that the increases in flow per .050" additional lift get less and less until you see no increases at all. Sorry, I got off track there. The point I wanted to make is to be careful picking a valve spring, the intake side will definitely be the factor when choosing...there is more to choosing a valve spring than the max lift the valve sees. The amount of lift per degree duration plays as big of a factor as anything else and the weight the lifter sees is a big factor too. Anything you can do to lighten the intake side will decrease the spring seat/open pressure required. Any decreases in spring pressures translates directly into longer spring life.

 

installing the ls2 cheater cam in my a6 this week. full bolt-ons with fast intake. will let you know. what other mods to get to 420rwhp? tq?

 

I thought you were also doing heads?? I'll be watching closely to see what "Cam Only" numbers you get. Which springs are you using, Patriot Golds?

Thanks,
Glenn

 

Heck yeah I am listening too

 

afr205s are on back order. it was at the end of May when i ordered this pkg from TR. the heads when i canceled were still 2 weeks out, afr has to ship them to TR to do the spring swap and then send them to me. i was told "only 2 weeks" well its been 5 weeks and still no heads. still have not heard back from TR on my credit for the heads and have recieved everything but springs. this kinda of sucks because i thought the heads would help the cam & i bought the FAST to compliment the heads. i this point i'm still waiting for a response from TR. funny thing was when i canceled my order on the heads i got a confirmation from UPS that my cam, pushrods, head bolts & gaskets(which are not needed now) were sent out within an hour of my phone call. springs i'm using are the ones they recommended for thier cam. what a big fn headache. will keep ya posted-john

 

whens the big day?

 

still waiting on my springs from tr.

 

I feel your pain.........