427 build complete - 500/520
11-02-2018, 02:31 PM
#1
TECH Apprentice
Thread Starter
427 build complete - 500/520 Hello,
I don't like the experience I had with the dyno shop I chose. I feel like there is more horse power to be found with the current setup. It put down 498whp 518wtq @ 12.9 AFR. There are parts of this build that I am changing in the some-what near future, as well as going with a different dyno tuner. This build is meant for Forced Induction (9.8:1 CR ) - however I am compelled to maximize its' current N/A state.
Internal:
427 TSP Shortblock
PRC 247cc 68cc chamber heads (Yes, CATHEDRAL, bring on the hate, that's ok :-))
235/244 .629/.615 112+4
-20cc Wiseco Pistons
.040 Cometic Head Gaskets
Trunion upgraded rockers
External:
Intake manifold: 102 FTP lid --> 100mm MAF --> 102mm Fabricated Aluminum 5.75" runner length
Headers: 1 3/4 Primaries to 3" Collectors
36lb injectors that are riding on their limits
Near future changes for now:
Ditching the Fab. Aluminum Intake - replacing with either:
Fast 102 LSXR, or MSD 102mm
Ditching stock coils, replacing with truck coils
Switching to 1 7/8 headers still to 3" primaries
42lb injectors (or 60+lb injectors depending on how quickly I go forced induction)
Forced induction:
Eyeing an F1A for now.
Thanks,
Andy
I don't like the experience I had with the dyno shop I chose. I feel like there is more horse power to be found with the current setup. It put down 498whp 518wtq @ 12.9 AFR. There are parts of this build that I am changing in the some-what near future, as well as going with a different dyno tuner. This build is meant for Forced Induction (9.8:1 CR ) - however I am compelled to maximize its' current N/A state.
Internal:
427 TSP Shortblock
PRC 247cc 68cc chamber heads (Yes, CATHEDRAL, bring on the hate, that's ok :-))
235/244 .629/.615 112+4
-20cc Wiseco Pistons
.040 Cometic Head Gaskets
Trunion upgraded rockers
External:
Intake manifold: 102 FTP lid --> 100mm MAF --> 102mm Fabricated Aluminum 5.75" runner length
Headers: 1 3/4 Primaries to 3" Collectors
36lb injectors that are riding on their limits
Near future changes for now:
Ditching the Fab. Aluminum Intake - replacing with either:
Fast 102 LSXR, or MSD 102mm
Ditching stock coils, replacing with truck coils
Switching to 1 7/8 headers still to 3" primaries
42lb injectors (or 60+lb injectors depending on how quickly I go forced induction)
Forced induction:
Eyeing an F1A for now.
Thanks,
Andy
11-02-2018, 03:43 PM
#2
Can we see the dyno graph ?
What RPM did hp peak at?
Playing with one of those fuel Injectors calculators seems like eight 42# injectors at 58 psi fuel pressure at 80% duty cycle calculate to be good for about 535-540 whp NA. At 90% duty cycle they should do about 600 whp NA . That might be OK for now but probably too small for forced induction because the 42's at 58 psi with 90% duty cycle in a forced induction calculate to support ~ 500 whp.
What RPM did hp peak at?
Playing with one of those fuel Injectors calculators seems like eight 42# injectors at 58 psi fuel pressure at 80% duty cycle calculate to be good for about 535-540 whp NA. At 90% duty cycle they should do about 600 whp NA . That might be OK for now but probably too small for forced induction because the 42's at 58 psi with 90% duty cycle in a forced induction calculate to support ~ 500 whp.
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11-02-2018, 08:58 PM
#8
Hello,
I don't like the experience I had with the dyno shop I chose. I feel like there is more horse power to be found with the current setup. It put down 498whp 518wtq @ 12.9 AFR. There are parts of this build that I am changing in the some-what near future, as well as going with a different dyno tuner. This build is meant for Forced Induction (9.8:1 CR ) - however I am compelled to maximize its' current N/A state.
Internal:
427 TSP Shortblock
PRC 247cc 68cc chamber heads (Yes, CATHEDRAL, bring on the hate, that's ok :-))
235/244 .629/.615 112+4
-20cc Wiseco Pistons
.040 Cometic Head Gaskets
Trunion upgraded rockers
External:
Intake manifold: 102 FTP lid --> 100mm MAF --> 102mm Fabricated Aluminum 5.75" runner length
Headers: 1 3/4 Primaries to 3" Collectors
36lb injectors that are riding on their limits
Near future changes for now:
Ditching the Fab. Aluminum Intake - replacing with either:
Fast 102 LSXR, or MSD 102mm
Ditching stock coils, replacing with truck coils
Switching to 1 7/8 headers still to 3" primaries
42lb injectors (or 60+lb injectors depending on how quickly I go forced induction)
Forced induction:
Eyeing an F1A for now.
Thanks,
Andy
I don't like the experience I had with the dyno shop I chose. I feel like there is more horse power to be found with the current setup. It put down 498whp 518wtq @ 12.9 AFR. There are parts of this build that I am changing in the some-what near future, as well as going with a different dyno tuner. This build is meant for Forced Induction (9.8:1 CR ) - however I am compelled to maximize its' current N/A state.
Internal:
427 TSP Shortblock
PRC 247cc 68cc chamber heads (Yes, CATHEDRAL, bring on the hate, that's ok :-))
235/244 .629/.615 112+4
-20cc Wiseco Pistons
.040 Cometic Head Gaskets
Trunion upgraded rockers
External:
Intake manifold: 102 FTP lid --> 100mm MAF --> 102mm Fabricated Aluminum 5.75" runner length
Headers: 1 3/4 Primaries to 3" Collectors
36lb injectors that are riding on their limits
Near future changes for now:
Ditching the Fab. Aluminum Intake - replacing with either:
Fast 102 LSXR, or MSD 102mm
Ditching stock coils, replacing with truck coils
Switching to 1 7/8 headers still to 3" primaries
42lb injectors (or 60+lb injectors depending on how quickly I go forced induction)
Forced induction:
Eyeing an F1A for now.
Thanks,
Andy
Add headers definitely.
What fuel pump? use the 42lb inj also. youll need 72lb+ for that F1A.
Leave the intake on it.
Get a second set of heads and mill em down to bring cr up. Something with a 227-237 runner.
Your cam is ok as long as you optimize the rest, itll be great for boost.
Did you measure pushrods?
What 427? Ls7 block or ls3 block?
11-18-2018, 04:19 PM
#12
TECH Senior Member
Where's the OP?
11-18-2018, 07:54 PM
#14
TECH Senior Member