For A4 guys: How about a big cam with a wide LSA?
01-12-2003, 06:58 PM
#1
For A4 guys: How about a big cam with a wide LSA? There has been alot of development this last year in cams, but how about this. A big cam with a wide LSA that would idle smooth in an A4 and give good gains. An example: 229/229 .580/.580 116 or even 117. Most of us have converters, so low end is not a problem. What kind of mid and upper range power would something like this give, and do you think it would idle smooth in an A4, even w/o programming?
01-13-2003, 10:50 AM
#2
TECH Senior Member
Re: For A4 guys: How about a big cam with a wide LSA? Optimum shift points would be pretty high...much higher than if you had a 112 LSA. It would certianly be smoother than the normal 112-114 LSA but how high do you want to shift?
01-13-2003, 05:46 PM
#3
Re: For A4 guys: How about a big cam with a wide LSA? oh boy, i have as big of a cam as most would ever tolerate at 230/230 on a 111 LSA. it is a handful i tell ya! i would NOT go with a super duper LSA of a 116 or you will end up reving that thing to the moon well beyond what the factory interals can take it. go with a 114 on a 230 (similar to a MMMS 229 cam) and you will end up shifting (optimally) at 6900-7000 rpms. i dont feel comfortable and shift mine at 6800 rpms and make peak at 6400 rpms.
if you want more smooth, go with a 224 on a 114 LSA.
if you want more smooth, go with a 224 on a 114 LSA.
01-13-2003, 07:30 PM
#4
Re: For A4 guys: How about a big cam with a wide LSA? I have a 232/236 on a 114. I got no gains raising the shift points above 6800. I did have cam surge issues when locked-up and the rpms dropped to 1300, so I'm pulling it out.
A wide LSA supposedly reduces the rpm at which peak HP is made but allows a wider band around peak HP. My 224/224 114 peaked at 6100 but carried out to 6600. At 6600 I was only down about 10 HP from peak.
What is the worse case from shifting a bit too early? If the cam peaks at 6200 and you shift 6400, you will still make good power and the flat profile of a wide LSA will probably make good torque down to 5000 rpm and your converter will keep your rpms there. It may not be optimal but you'll still be fast.
It becomes an area under the curve issue. Would a 228/228 116 make more power than a 224/224 114 and be that much more drivable? - my guess is probably not.
The biggest problem I see is that your I/C will end being high even with 4* or 5* advance and your peak torque will occur high causing suboptimal 60' times.
FWIW, I have a 228/228 114 +4 XE-R cam coming.
A wide LSA supposedly reduces the rpm at which peak HP is made but allows a wider band around peak HP. My 224/224 114 peaked at 6100 but carried out to 6600. At 6600 I was only down about 10 HP from peak.
What is the worse case from shifting a bit too early? If the cam peaks at 6200 and you shift 6400, you will still make good power and the flat profile of a wide LSA will probably make good torque down to 5000 rpm and your converter will keep your rpms there. It may not be optimal but you'll still be fast.
It becomes an area under the curve issue. Would a 228/228 116 make more power than a 224/224 114 and be that much more drivable? - my guess is probably not.
The biggest problem I see is that your I/C will end being high even with 4* or 5* advance and your peak torque will occur high causing suboptimal 60' times.
FWIW, I have a 228/228 114 +4 XE-R cam coming.
