CMS C5 454ci build
#1
CMS C5 454ci build
Just finished up this build. We experimented with this cam and intake combo. We will be backing the cam down a little bit since the customer wants to start road racing.
Specs---
1999 C5 6 speed
LSX 454 ci
13.1 compression
WCCH Brodix Stage 2 Ls7 heads with CHE modded Ls7 rockers
25x 26x custom cam
Ported Fast 102 intake manifold and 102 TB
Halltech CF112 intake
1 7/8 AR headers no cats
CMS custom 3" catback
RPS street twin clutch
CMS custom 1 bar speed density tune
This was on 91 octane + some torco, customer will be switching to E85 in the near future once we swap the cam, which will significantly raise Dynamic Compression.
Graphs:
video:
http://youtu.be/jcuobqlqSQs
Specs---
1999 C5 6 speed
LSX 454 ci
13.1 compression
WCCH Brodix Stage 2 Ls7 heads with CHE modded Ls7 rockers
25x 26x custom cam
Ported Fast 102 intake manifold and 102 TB
Halltech CF112 intake
1 7/8 AR headers no cats
CMS custom 3" catback
RPS street twin clutch
CMS custom 1 bar speed density tune
This was on 91 octane + some torco, customer will be switching to E85 in the near future once we swap the cam, which will significantly raise Dynamic Compression.
Graphs:
video:
http://youtu.be/jcuobqlqSQs
#3
Great work as always CMS! I hope my 418 with a new fast 102 and ryne s tune can be as impressive as that 454
#5
it is a combination of two people...initially we had shortened the runners to what would happen, it was kind of a flop, it lost power from 4k on and didnt pick up on the top end. then we re-installed a new set of un-altered runners from fast and we just match ported the runner opening to the existing lightly ported fast base... the car picked 25 rwhp and 20 rwtq swapping back to the unaltered longer fast runners, in addition didnt lose power up top.... it carries the power pretty far likely because its got a fair amount of duration on a not so tight lsa, really widens the curve. we are going to be putting in a smaller cam (roughly 10-12 degrees smaller) for road racing, and switching to e85
#6
I have had 3 different cams in my ls7 build and finally arrived at something in the same range as what you have. 254/265ish range. And I know it wont carry that high. Going to try playin with the fast. If a ported fast gets me 20 or 25 rwhp. I'm looking at power similar to what you have with a 427 and more compression
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#8
I have had 3 different cams in my ls7 build and finally arrived at something in the same range as what you have. 254/265ish range. And I know it wont carry that high. Going to try playin with the fast. If a ported fast gets me 20 or 25 rwhp. I'm looking at power similar to what you have with a 427 and more compression
#10
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Next cam should really pump up the low and mid range without sacraficing much on the top end. E85 maybe next week, just to see how the big cam likes it for a glory pass.
#12
A lot of people may understand it but still don't use it. Most of the builds are still in the low 11's on SCR with large cams. I am glad you guys are experimenting and posting results. Great work. My next project is going to be a large cube NA motor. Lots of great stuff coming out now. I am excited to see what you all end up with.