stock mufflers sound awesome when you take the cat off the car on ours. Borla xspro's would be ftw though, I have to say.
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01-11-2008
stock mufflers sound awesome when you take the cat off the car on ours. Borla xspro's would be ftw though, I have to say.
01-11-2008
One of my local friends 97 GTP had a S1X with ported heads, intercooler, headers, gen V blower, N* tb, 3.29s..... Anyways the car ran low 12s on motor and lost a piston during a nitrous run last year so I rebuilt the engine and this time around used an XP cam that needed some loving care or was going in the trash. Long story short the bearing mains on the cam were groved up bad from the engine it originally came from out of a different car and we had to use custom size cam bearings and have the cam turned to use it. After driving the car several hundred miles he stood on it a few times and was shocked by the stronger topend pull. I rode in the car earlier this week while doing some idle tuning for the new cam and it really does pull a lot stronger over 5K rpm, and especially over 6K rpm. I always like the strong powerband of the S1X cam and felt it to be a tossup between the two cams but as Lee mentioned earlier as well as others the S1X has great all around power and the XP lacks a bit of low rpm light throttle power and more than offsets it up top if that is your priority. I have the XP cam in my rwd cutlass and it pulls very strong all around. Both cams work well with stock heads also, so this seems to be the line whether you run stock heads or modified heads.
01-11-2008
1/4 mile times on average would probably favor the S1X unless you go for at least 3.29's and a stall. Car barely gets into 3rd with 2.93's at the 1/4, so you really want to capitalize the low and mid-range. One of the reasons I came up with my back half MPH list was to help me decide on what cam phasing I was going to use. The results brought me to the conclusion the car needed more grunt in the 3000-4500rpm range, so advancing either cam would be a good idea if clearances are checked properly.
Remember, if using the Rollmaster, it was developed for the L36, so it may be retarded 2 degrees when installed straight up in an L67.
01-11-2008
I must have been living under a rock...why have I not heard of this? It's deffinately good information to know. Next setup is going to basically involve a beefed up L26 bottom end.....does this still apply? Or will it need to be installed at the TDC that shows on the cam.Originally Posted by Ron Vogel
01-11-2008
Wow, that's news to me. What effects would 2* of retarded timing do? I have since gone back to stock cam with stock gears and a new stock timing chain.
I'd like to see some pics.
01-12-2008
Would give better top end, but blows a lot of cyl pressure out the exhaust. Retarding the cam moves the powerband up, advancing moves it back down. Good way to maximize a combo.
Betcha a lot of guys would pick up a few tenths by advancing the Rollmaster that 2 degrees, although I wouldn't mess with cam timing without a degree wheel and clay on the pistons.
01-12-2008
Do you know if this timing difference applies to only the Rollmaster or JP as well?
01-12-2008
I have no idea. All I know is the rollmaster was developed from the L36, so it's based off it's timing set. The JP may have been off of either. Would be nice info to know though.
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