<font face="Verdana, Arial" size="2">Originally posted by mdpay:
The 9hp increase seems to be very optimistic.
I have a graph showing a 91 SER with S3 cams with only a 9hp gain. If both of those graphs are correct, I will see a 18hp increase with my S3 cams on my 97 200sx.
JWT claims I will only see a 10-15hp increase with S3 cams.
Mike</font>
You have to remember... That 9hp gain is only representative of ONE particular car that dyno'd with the comparison between the low-port intake cam and the high-port intake cam. Not every car will see the same results. Too many variables to consider.
You can't assume that if a high-port SR20 gained 9hp with the JWT cams, and a low-port SR20 gained 9hp with the high-port intake cam, then the low-port SR20 will gain 18hp with the JWT cams. You can't add horsepower that way. If that were the case, the SR20 would make well over 200hp with just bolt-on's and no internal engine work.
However, it has been shown that a low-port SR20 will show more gains with the JWT cams than a high-port SR20 would.
Regarding the SCC Project Sentra SE-R cam shootout, if anyone has actually read the article, you'll see that Dave Coleman stated something to the effect of, "Since we are using a '98 intake cam in a '91 cylinder head, the gains may not represent the actual gains on a '94+ cylinder head; it's an approximation, but it's the best we could do." Unfortunately, SCC does not have another low-port SR20 in which to do the same tests (Mike Kojima's car wouldn't be representative as he has a fully built SR20.)
FYI, the '98 intake cam is the same as all the low-port cams post-'94 and pre-roller rocker SR20's.
--Andrew Phan
1993 NX2000 (stock cams, and staying that way)
1998 200SX SE-R (JWT S3 cams, but soon to be stock again)