|
C5 Open Discussion General and technical C5 Corvette discussion - ownership, maintenance, repairs, modifications, tuning |
|
Share | Thread Tools | Search this Thread |
10-22-2009, 9:51am | #21 | ||||||
Charter Member
Join Date: Oct 2009
Location: Northern VA
Posts: 1,358
Thanks: 52
Thanked 179 Times in 145 Posts
Gameroom Barn Bucks: $5852
|
IMHO: The best cams for the street will have a tight LSA. Tighter LSA - 110-112 - will give you better bottom and mid power than a wider LSA (114+). A byproduct of the tighter LSA is they do tend to lope harder all things being equal. I've never run a cam wider than 112. My current cam is 111. Overlap is another factor that determines idle quality. More overlap = rougher idle. For example LG's G5X3 on a 112 has 13 degrees of overlap. I had a cam that had 19 degrees. It was pretty much untunable. My current cam has 10 degrees of overlap and idles fairly smoothly.
Last edited by WKMCD; 10-22-2009 at 9:54am. |
||||||
The Following User Says Thank You to WKMCD For This Useful Post: |
10-22-2009, 10:17am | #22 | ||||||
Charter Member
Join Date: Oct 2009
Location: Virginia Beach
Posts: 1,700
Thanks: 43
Thanked 213 Times in 162 Posts
Gameroom Barn Bucks: $8830
|
I disagree a bit... wider LSA makes for a bit smoother idle and the car is easier to tune for drivability. Your power band will be moved up a bit, but it will be roader. Tight LSAs = more mid range, but also a narrower powerband.
Based on this calculator my 232/240 G5-X2 on a 114 LSA has 8 degrees of overlap. A G5-X3 which is 234/242 is a bit more... w/ a 112 LSA it shows 14 degrees overlap.
__________________
2001 Quicksilver Z06 - NASA PTA/TTA/ST2 #4 www.carsandcoffeevirginiabeach.com April 7th, 2012 7:30am-9:30am @ La Promenade |
||||||
10-22-2009, 10:27am | #23 | |||||||
Charter Member
Join Date: Oct 2009
Location: Northern VA
Posts: 1,358
Thanks: 52
Thanked 179 Times in 145 Posts
Gameroom Barn Bucks: $5852
|
Quote:
BTW: Most cam designers get the valve events right and the lsa falls were it falls. It's not something that is predetermined in the design stage. After the cam is spec'd they look back and see where the LSA ended up. I learned quite a bit from Bret Bauer re cam design when he was doing mine. We still talk all the time. Last edited by WKMCD; 10-22-2009 at 10:31am. |
|||||||
10-22-2009, 10:40am | #24 | ||||||
Charter Member
Join Date: Oct 2009
Location: Virginia Beach
Posts: 1,700
Thanks: 43
Thanked 213 Times in 162 Posts
Gameroom Barn Bucks: $8830
|
That is true... if going w/ a completely custom cam. I had Patrick G spec a new cam for me, but in the end I'm going to keep my G5-X2 in there. With an off the shelf cam you usualliy have the option of picking which LSA you want w/ the grind. The quick and dirty of it all is that the lower the LSA the narrower the power band and lower in the RPM range while the higher the LSA (wider angle) the broader the powerband is, but with peaking coming higher in the rpm range.
I don't disagree that for a street only car you want lots of low end torque. My car doesn't start to boogie until 3500rpms... it's no dog below that, but it could have more grunt. The nice thing is that w/ my wide duration spread the cam makes great power after peak and will pull past 7000 rpms easily if I wanted to. However I only pull it to 6800ish on the street.
__________________
2001 Quicksilver Z06 - NASA PTA/TTA/ST2 #4 www.carsandcoffeevirginiabeach.com April 7th, 2012 7:30am-9:30am @ La Promenade |
||||||
10-22-2009, 11:01am | #25 | ||||||
Charter Member
Join Date: Oct 2009
Location: Northern VA
Posts: 1,358
Thanks: 52
Thanked 179 Times in 145 Posts
Gameroom Barn Bucks: $5852
|
|
||||||
10-22-2009, 11:43am | #26 | ||||||
Charter Member
Join Date: Oct 2009
Location: Virginia Beach
Posts: 1,700
Thanks: 43
Thanked 213 Times in 162 Posts
Gameroom Barn Bucks: $8830
|
I picked my cam when I was doing HPDEs in the car... I wanted a higher end powerband because the car is rarely below 3000 rpms at VIR etc.
My car is no slouch down low like some huge cammed cars... the LSA is actually a 114+4 so it has advanced ground in and makes good mid-range. Yes I could have a stump puller cam for the street, but that'd just result in more tire spin. Even w/ the 3500+ cam powerband the car will still roll the tires over in 1st and 2nd when leaving from a roll. If you compare my bolt-ons dyno to my cam dyno you'll see that below 300 rpms I'm down about 5-7 ft/lbs, then from 3000-3500 they're equal, then after 3500 everything goes up.
__________________
2001 Quicksilver Z06 - NASA PTA/TTA/ST2 #4 www.carsandcoffeevirginiabeach.com April 7th, 2012 7:30am-9:30am @ La Promenade |
||||||
10-22-2009, 4:38pm | #27 | |||||||
Administrator
Barn Stall Owner #7 Barn Raising I,II,IV NCM Supporter '13,'14
Join Date: Oct 2009
Location: Pewaukee,WI
Posts: 8,215
Thanks: 1,044
Thanked 5,024 Times in 2,237 Posts
Gameroom Barn Bucks: $30682687
|
Quote:
It idles stable, is no problem in stop n go traffic, re-starts nicely and settles into idle right away. The usual trouble points that tuners hate about huge cams. It does surge a bit below 1500RPM in the lower gears, so guess what, I don't drive below 1500RPM. Heck, I didn't even drive below 1500 RPM when it was stock, why would I want to now? As for the other downsides, I LIKE the loud, the outrageous loping and shaking, and I have no emissions concerns to deal with. The sweet smell of unburnt fuel also does not bother me. The usual use of my car is to shows and cruise nights, where loud and outrageous is the name of the game. Or, going out to run the twisty rural backroads with the sole intention of burning up a tank of gas as quickly as possible. And maybe the occasional freeway roll-on match...which I usually downshift to 3rd to initiate. (M6 car) All in all, I really don't care what it does below 3000RPMs, and have never found a need to either. The manners are fine enough to cruise in traffic sedately, and it's more than ballsy enough when the power IS called on. What lies in between those extremes is of little concern. I don't drive it daily, I almost never drive it to work, and rarely in heavy traffic (unless unavoidable). It's just a toy, not transportation to me. For those purposes, a baby cam is not at all what I would want, and I'm not at all unhappy with my current cam choice...it's done everything I wanted it to do, and then some. If I had to do it over, my next one will be bigger yet. I've run against 224/228 cars already with $$ heads, and Mamofied FAST90 intake, I know the results too. NFW would I ever go to a smaller cam. As with anything, there is no right or wrong here, a cam choice is personal preference, and it sounds like your needs and desires for a street car are considerably different than mine. Thats exactly why I asked the OP what his preferences were in post #2, before suggesting anything. |
|||||||
10-22-2009, 7:33pm | #28 | ||||||
Charter Member
Sophisticated PITA CM
|
Well...........I like my 2
HYDRAULIC ROLLER CAM .613/.647 @ 250/258 WITH 114+2 LSA Too bad the 00' is stock...............so far |
||||||
The Following User Says Thank You to nedih rotaredom For This Useful Post: |
10-24-2009, 2:47pm | #29 | ||||||
Charter Member
Join Date: Oct 2009
Location: Virginia Beach VA
Posts: 2,278
Thanks: 60
Thanked 337 Times in 226 Posts
Gameroom Barn Bucks: $9916
|
__________________
Will work, or whore myself out for Corvette mods. Virginia RatPack - Trouble Maker Street Dreams Corvette Club |
||||||
10-24-2009, 6:48pm | #30 | ||||||
Charter Member
Join Date: Oct 2009
Location: Yorktown, Va
Posts: 519
Thanks: 29
Thanked 54 Times in 35 Posts
Gameroom Barn Bucks: $2689
|
|
||||||
10-25-2009, 6:15am | #31 | ||||||
Charter Member
Join Date: Oct 2009
Location: Newport News Va
Posts: 161
Thanks: 17
Thanked 23 Times in 11 Posts
Gameroom Barn Bucks: $27
|
|
||||||
10-25-2009, 10:19am | #32 | ||||||
Charter Member
Join Date: Oct 2009
Location: Vanceboro, NC
Posts: 21
Thanks: 0
Thanked 1 Time in 1 Post
Gameroom Barn Bucks: $500
|
There's no reason the OP can't have the best of both worlds. Why not do a cam that has good lowend and pulls to 6800/7000?
|
||||||
10-25-2009, 10:54am | #33 | |||||||
Administrator
Barn Stall Owner #7 Barn Raising I,II,IV NCM Supporter '13,'14
Join Date: Oct 2009
Location: Pewaukee,WI
Posts: 8,215
Thanks: 1,044
Thanked 5,024 Times in 2,237 Posts
Gameroom Barn Bucks: $30682687
|
Quote:
A cam is always a compromise in one way or another, and it again boils down to what the person wants, doesn't want, the supporting mods, and how the vehicle is used. Simply assuming all those aspects just because it's a "street car" is not the best approach, and is still not a "one size fits all" definition. |
|||||||
10-25-2009, 8:16pm | #34 | |||||||
Charter Member
Join Date: Oct 2009
Location: Vanceboro, NC
Posts: 21
Thanks: 0
Thanked 1 Time in 1 Post
Gameroom Barn Bucks: $500
|
Quote:
|
|||||||
10-25-2009, 8:44pm | #35 | |||||||
Administrator
Barn Stall Owner #7 Barn Raising I,II,IV NCM Supporter '13,'14
Join Date: Oct 2009
Location: Pewaukee,WI
Posts: 8,215
Thanks: 1,044
Thanked 5,024 Times in 2,237 Posts
Gameroom Barn Bucks: $30682687
|
Quote:
The point I've tried to make in every single reply I have on this thread, is that you, me, Kevin, even your bud Bret does not have the info needed to correctly spec a cam for this guy, not even enough to suggest a ballpark duration. This application info is what we are lacking. |
|||||||
10-25-2009, 8:49pm | #36 | |||||||
Charter Member
Join Date: Oct 2009
Location: Vanceboro, NC
Posts: 21
Thanks: 0
Thanked 1 Time in 1 Post
Gameroom Barn Bucks: $500
|
Quote:
Last edited by willyfastz; 10-25-2009 at 8:54pm. |
|||||||
11-09-2009, 3:01pm | #37 | ||||||
Charter Member
Join Date: Oct 2009
Location: Yorktown, Va
Posts: 519
Thanks: 29
Thanked 54 Times in 35 Posts
Gameroom Barn Bucks: $2689
|
|
||||||
11-09-2009, 5:54pm | #38 | ||||||
Charter Member
Join Date: Oct 2009
Location: Newport News Va
Posts: 161
Thanks: 17
Thanked 23 Times in 11 Posts
Gameroom Barn Bucks: $27
|
Yes I got the spec sheet. Looks really good.
|
||||||
11-10-2009, 11:46am | #39 | ||||||
Charter Member
Join Date: Oct 2009
Location: Yorktown, Va
Posts: 519
Thanks: 29
Thanked 54 Times in 35 Posts
Gameroom Barn Bucks: $2689
|
|
||||||
11-16-2009, 9:00pm | #40 | ||||||
Charter Member
Join Date: Oct 2009
Location: Vanceboro, NC
Posts: 21
Thanks: 0
Thanked 1 Time in 1 Post
Gameroom Barn Bucks: $500
|
What part of the specs looked good?
|
||||||
Thread Tools | Search this Thread |
|
|
Support the Barn: |
Download the Mobile App; |
Follow us on Facebook: |
||