C5Z06 (370ci/Race Gas) vs G8GT (TT/E85) *vid*
08-23-2012, 02:17 PM
#21
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08-23-2012, 09:16 PM
#23
Looks like you guys are having fun! Its amazing how slow a 130+ trap feels in a G8. Its just so stable and smooth.
Sounds like the stock heads and IM are killing the Z's top end. I know even on a mild 364 the OEM IM killed top end by 30+whp, so I cant imagine with more underneath it... just a choke point.
Sounds like the stock heads and IM are killing the Z's top end. I know even on a mild 364 the OEM IM killed top end by 30+whp, so I cant imagine with more underneath it... just a choke point.
08-23-2012, 11:29 PM
#24
Staging Lane
Looks like you guys are having fun! Its amazing how slow a 130+ trap feels in a G8. Its just so stable and smooth.
Sounds like the stock heads and IM are killing the Z's top end. I know even on a mild 364 the OEM IM killed top end by 30+whp, so I cant imagine with more underneath it... just a choke point.
Sounds like the stock heads and IM are killing the Z's top end. I know even on a mild 364 the OEM IM killed top end by 30+whp, so I cant imagine with more underneath it... just a choke point.
For the record: I am 11.3 to 1 CR and have NEVER had a ping running on the higher end of recommended timing at a total of 28 degrees. I've got acquaintances with big cube 13+ to 1 CR lsx engines running E85 and meth. that 2 point higher in compression pays off in spades on the dyno...
08-25-2012, 10:14 AM
#25
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I understand how that works... but once you start getting passed 11:1....you start sacrificing your ability to run on pump octane for minimal gain. That whole "jack up the compression to make up for the spongeyness of the cam that is way to big for this motor" theory doesnt work. Ive been there... ive done that on one of my numerous motors. I personally prefer 10.5-11.0 for an N/A motor. Compression is a bit over rated in the modern era. Back in the 60s... compression and cubic inch were king...
Its pretty clear that the setup in this z06 isnt very good. Like HIO said, a full bolt on z06 would have done better.
Its pretty clear that the setup in this z06 isnt very good. Like HIO said, a full bolt on z06 would have done better.
08-25-2012, 10:29 AM
#26
my strongest motors always had the least compression. Not saying compression hurt the numbers of the other motors... but it just mattered that little. Nowadays its all efficient combustion chambers and cfm.
08-25-2012, 10:31 AM
#27
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Yea i tune the c5z it just needs a new intake and ported heads to really perform the way it needs to. it did made 485 on a mustang dyno but the numbers drop pretty hard after 6500 rpms and he shifts at 7,000 plus :/
08-28-2012, 04:30 AM
#28
Actually the stock LS3 heads flow 320-340cfm and the stock LS3 intake flows as good (or better) then a FAST. Port the LS3 intake and a FAST can't touch it. That setup in that vette sounds like a setup that should run great, but I'm betting someone screwed up the timing (either too much or too little).
For the record: I am 11.3 to 1 CR and have NEVER had a ping running on the higher end of recommended timing at a total of 28 degrees. I've got acquaintances with big cube 13+ to 1 CR lsx engines running E85 and meth. that 2 point higher in compression pays off in spades on the dyno...
For the record: I am 11.3 to 1 CR and have NEVER had a ping running on the higher end of recommended timing at a total of 28 degrees. I've got acquaintances with big cube 13+ to 1 CR lsx engines running E85 and meth. that 2 point higher in compression pays off in spades on the dyno...
Yeah I have a 454 LS engine, LS7 heads, with a single plane now... it is a lot of fun.
08-28-2012, 02:03 PM
#29
Well obviously a turbo car isn't going to last long with the same setup compression as a nitrous/all motor setup. Me personally, Idc as much about turbo cars. I like all motor and nitrous cars, which is where compression actually matters. Anything with a turbo kit slapped on will always be considerably faster. Reason why i got a domestic is because you don't need a turbo kit to make over 500whp. In the import world its needed lol.
