Please help!! Missing over 50rwhp after G5X3/LSX intake install! Dyno graph inside.
03-09-2004, 05:04 PM
#84
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Originally Posted by Pro Stock John
02 sensors
MAF
Did you recently pull the heads off? If so crap washed down the header pipes perhaps.
MAF
Did you recently pull the heads off? If so crap washed down the header pipes perhaps.
I swapped my MAF for another one and there was no difference at all. Dead on. Louis of LG suggested checking the plug itself as they've had a few problems with that.
Yes the heads were pulled off to flycut and to repair the 7 bent valves I had.
Originally Posted by SPANKY LS1
Were your heads ever flowed to .600+ lift?
.100 72.2 55.0
.200 141.6 105.2
.300 205.6 151.5
.400 254.6 193.4
.500 290.1 231.0
.550 300.4 247.2
.600 306.2 260.4
Originally Posted by gomer
Verbs,
Hey I tried to PM you, but your box was full earlier. It's kinda off subject, but are you still using stock injectors? If not, what are you using.
Thanks
Hey I tried to PM you, but your box was full earlier. It's kinda off subject, but are you still using stock injectors? If not, what are you using.
Thanks
Last edited by verbs; 03-09-2004 at 05:18 PM.
03-09-2004, 05:08 PM
#85
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Here is a dyno graph showing my dyno pull today vs. my dyno pull at this same shop with the old setup. The A/F ratios were identical on both, between 12.8 and 13.0 the entire way.
The differences are:
Old setup had 230/224 cam, comp 987 springs, 3.73 gears, 10.8:1 compression, ls6 intake, stock waterpump, no YT rockers
New setup has a G5X3 cam, Crane 832 dual springs good to .650 lift, YT rockers, Meziere pump, port matched LSX intake, and about 10.6:1 compression.
As you can see I'm down about 40rwtq down low, and a good amount of power throughout most of the graph. Now notice how my new setup peaks at 6200rpms or so, and it's supposed to peak at 6400-6500 rpms per LG. Maybe there's just a hint of valvefloat because the power does stop a bit short.
The differences are:
Old setup had 230/224 cam, comp 987 springs, 3.73 gears, 10.8:1 compression, ls6 intake, stock waterpump, no YT rockers
New setup has a G5X3 cam, Crane 832 dual springs good to .650 lift, YT rockers, Meziere pump, port matched LSX intake, and about 10.6:1 compression.
As you can see I'm down about 40rwtq down low, and a good amount of power throughout most of the graph. Now notice how my new setup peaks at 6200rpms or so, and it's supposed to peak at 6400-6500 rpms per LG. Maybe there's just a hint of valvefloat because the power does stop a bit short.
I was thinking the same thing.
03-09-2004, 09:54 PM
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The first thing that popped in my head was the TEA Heads. When i posted my dyno numbers with the 232/236 .595/.602 cam everyone said it was my heads and I was told to stay with a higher intake duration and lower exhaust duration and to keep the lift around .570ish. I know this sounds like a pain in the *** but i would swap cams back and see the difference. I never got the chance to swap cams cause i sold the car. I dont think those heads like that cam, dont get me wrong 430 RWHP is killer but not for what that cam is capable of.
03-09-2004, 09:54 PM
#90
Since the valves have been replaced the old flow numbers don't really mean much IMO. Quality valve job & correct angles makes or breaks any set of heads.
Who installed the replacement valves? Did they flow the heads after the new valves were replaced to make sure they were flowing like they should? If so what were the new numbers? Were the old heads were flowed with the LSX in place to determine if any port stall occured?
BTW-What's peak lift for that cam?
Who installed the replacement valves? Did they flow the heads after the new valves were replaced to make sure they were flowing like they should? If so what were the new numbers? Were the old heads were flowed with the LSX in place to determine if any port stall occured?
BTW-What's peak lift for that cam?
Last edited by 99 Black Bird T/A; 03-09-2004 at 10:08 PM.
03-10-2004, 01:15 AM
#91
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Originally Posted by 99 Black Bird T/A
Since the valves have been replaced the old flow numbers don't really mean much IMO. Quality valve job & correct angles makes or breaks any set of heads.
Who installed the replacement valves? Did they flow the heads after the new valves were replaced to make sure they were flowing like they should? If so what were the new numbers? Were the old heads were flowed with the LSX in place to determine if any port stall occured?
BTW-What's peak lift for that cam?
Who installed the replacement valves? Did they flow the heads after the new valves were replaced to make sure they were flowing like they should? If so what were the new numbers? Were the old heads were flowed with the LSX in place to determine if any port stall occured?
BTW-What's peak lift for that cam?
His setup feels strong as hell but I Think there is a LOT more in it, but with the 4.10s the tach is sooo far behind that you cant really tell what RPM your shifting at accuratly until 3rd and 4th, and with his exhaust its a lil loud to be doing those kinds of speeds on the street! We have almost identicle cams, mine with stock LS6 heads and his with TEA 5.3s... and while his does feel a little faster, it also has twice my mods and 4.10s versus my 3.73s, and his car is close to 150 lbs less so tough to do a SOTP feel... I just wish I knew what the shop really did or didnt do because that would make life much easier!
03-10-2004, 10:09 AM
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Originally Posted by SSOnYourSix
If the shop in question did his head repair I wouldnt trust them, they are also the ones that put 2 broken spark plug wires back on the car and couldnt figure it out...
03-10-2004, 12:16 PM
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Originally Posted by Damian
Again.....
Was your valvejob recut after replacing those bent valves?
Was your valvejob recut after replacing those bent valves?
03-11-2004, 12:57 AM
#96
Originally Posted by verbs
I have flow #'s up to 600 lift, and my heads kept pulling in more CFM all the way to .600 lift. HOWEVER!!! Maybe something I need to consider is port stalling.
This is not the problem if they even stall.
Chris
03-11-2004, 04:48 AM
#97
Originally Posted by verbs
they tested the valve seat for pressure by using Serdi Machine (which is how they found the bent vavles), and did a valve job only where the valves needed replacing.
03-11-2004, 07:56 AM
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Originally Posted by Brian Tooley
You gotta be kidding me, I tell everyone never to let anyone mess with the VJ on those heads, or any other we do, and people do it all the time and then are down on power and wonder why, and then they said they only cut the seats with the bad valves??? I think you just took one of the best sets of 5.3 heads to come out of here and killed em.
Last edited by verbs; 03-11-2004 at 09:30 AM.
03-11-2004, 11:10 PM
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Originally Posted by GrannySShifting
We have the same looking graph, g5x3 cam, peaked at 6000-flatlined to 6300 then droped like a rock. Was making 436 at 6000 RPM. Looking at the rockers first (loosen them up) then maybe valve float.