Need Major Advise!!! Real Knowledge Apply Only!
tRUE, BUT THE PROBLEM IS, MY BUDDY, AND TUNER(SAME GUY) RAN HIS CAR 5 MINUTES PRIOR, AND HE POSTED 481HP AND 440 TQ....DOESN'T ADD UP?...MY CAR PULLS SO HARD....EFI SHOOTOUT IS TODAY...i'M NOT GOING TO RUN...i'VE GOT THE DYNO GRAPH...DON'T KNOW HOW TO POST IT....
I'd check the tune first. You stated the A/F, but what about timing? Any KR?
With the pushrod length change for the TFS heads, I'd be suspect of preload and pushrod length, especially with an aftermarket rocker.
Exhaust is a non-issue.
I feel for you. You didn't cut any corners, and I'm sure you're P.O.ed.
With the pushrod length change for the TFS heads, I'd be suspect of preload and pushrod length, especially with an aftermarket rocker.
Exhaust is a non-issue.
I feel for you. You didn't cut any corners, and I'm sure you're P.O.ed.
Before posting the dyno graph, get an autotap type scanner that can display what all the sensors are reporting and drive the car around while monitoring it. Things like KR (knock retard), o2 readings, TPS readings, ignition timing curves are all important at this point toward identifying the problem. Take note of these readings and post them here. If everything checks out, do a compression test. And obviously you need to contact LME if you haven't done so, and they can probably help you out. With all the good experience LME has, I doubt they messed something up during assembly.
Also, how did you break the motor in? That can play a role too.
Also, how did you break the motor in? That can play a role too.
The lift quoted is for your cam with 1.7 rockers or the 1.8's that your using. Could be getting some valve float. The afr at 12.5 is too rich. Should be closer to 12.9-13.0. Have to tune that on the dyno to see where the motor likes the a/f and timing. With those power numbers I assume there is some type of parts mismatch or mechanical problem. Post up the graph.
Whew, found out what the problem was.....I was running on 7 cyl....Found a bent prong on the coil.....fixed that and it runs like a champ....I'm coming to Houston next weekend....anyone know of a good place to tune with H/P and have use of a Dyno?..Guys, thanks for all the help...Hey Chris, you don't have to worry about your motor now.......
426 rwhp on 7 cylinders would be like 487 rwhp on 8, but if you were getting a 12.5 A/F ratio with 1 cylinder spewing out unburned fuel, you may gain even more by gettting your A/F dialed in better. That's good news.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Originally Posted by getusum
Whew, found out what the problem was.....I was running on 7 cyl....Found a bent prong on the coil.....fixed that and it runs like a champ....I'm coming to Houston next weekend....anyone know of a good place to tune with H/P and have use of a Dyno?..Guys, thanks for all the help...Hey Chris, you don't have to worry about your motor now.......
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Originally Posted by 01350ss
you couldn't feel a dead hole?
I guess ive been there, too, man. 
TECH Addict
Joined: Dec 2001
Posts: 2,907
Likes: 1
From: Bergen County, NJ
Originally Posted by getusum
Whew, found out what the problem was.....I was running on 7 cyl....Found a bent prong on the coil.....fixed that and it runs like a champ....I'm coming to Houston next weekend....anyone know of a good place to tune with H/P and have use of a Dyno?..Guys, thanks for all the help...Hey Chris, you don't have to worry about your motor now.......
Originally Posted by Patrick G
426 rwhp on 7 cylinders would be like 487 rwhp on 8, but if you were getting a 12.5 A/F ratio with 1 cylinder spewing out unburned fuel, you may gain even more by gettting your A/F dialed in better. That's good news.
Originally Posted by getusum
Whew, found out what the problem was.....I was running on 7 cyl....Found a bent prong on the coil.....fixed that and it runs like a champ....I'm coming to Houston next weekend....anyone know of a good place to tune with H/P and have use of a Dyno?..Guys, thanks for all the help...Hey Chris, you don't have to worry about your motor now.......
mani was realy starting to sweat.. im at the 11th hour with this motor, not really anything i can do to change the order.. so im glad you got that **** figured out!
Originally Posted by fast98
hes probably running really rich, widebands dont look at fuel they look at air, so he was dumping one whole cylinder of just air into the exhaust, which would make the wb read leaner than it acctually is........... i'll bet that thing will make alot by getting the a/f inline
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Originally Posted by Patrick G
You've got it backward. If the ignition coil was unplugged, the fuel injector still squirts the fuel into the dead cylinder, but there's no ignition. Unburned raw fuel going into the exhaust is going to skew the A/F readings rich. Leaning it out to get to 12.5:1 may mean the all the other 7 cylinders are now really lean.
There is no burn. Even though there gas going through there, since its not igniting and consuming oxygen, it does not make teh exhaust appear rich. All the o2 cares about is lambda, regardless of the fuel. Run straight gas, propane, methanol, ethanol, acetone, grandpa's moonshine, whatever will burn, and the o2 will read the oxygen content and tell you if the burn is chemically correct. As fast98 suggested, the cylinder full or air was making the exhaust appear lean to the wideband, and in tuning to compensate, they overly richened up the other cylinders.
Gotta watch it, man. A lot of us take your word as cold hard fact. Dont slip up on us now!!!
Originally Posted by GuitsBoy
Wow, wow, wow! Lets take a step back.
There is no burn. Even though there gas going through there, since its not igniting and consuming oxygen, it does not make teh exhaust appear rich. All the o2 cares about is lambda, regardless of the fuel. Run straight gas, propane, methanol, ethanol, acetone, grandpa's moonshine, whatever will burn, and the o2 will read the oxygen content and tell you if the burn is chemically correct. As fast98 suggested, the cylinder full or air was making the exhaust appear lean to the wideband, and in tuning to compensate, they overly richened up the other cylinders.
Gotta watch it, man. A lot of us take your word as cold hard fact. Dont slip up on us now!!!
There is no burn. Even though there gas going through there, since its not igniting and consuming oxygen, it does not make teh exhaust appear rich. All the o2 cares about is lambda, regardless of the fuel. Run straight gas, propane, methanol, ethanol, acetone, grandpa's moonshine, whatever will burn, and the o2 will read the oxygen content and tell you if the burn is chemically correct. As fast98 suggested, the cylinder full or air was making the exhaust appear lean to the wideband, and in tuning to compensate, they overly richened up the other cylinders.
Gotta watch it, man. A lot of us take your word as cold hard fact. Dont slip up on us now!!!
TECH Senior Member
iTrader: (3)
Joined: Apr 2006
Posts: 6,524
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From: Western Burbs of Detroit
Originally Posted by getusum
I'm definately trying another dyno....cam degreeing was done by builder...motor has been in a week with about 700 miles....It pulls harder than my numbers post....could be the tune...but the tune works great, and my a/f is almost perfect....very confused,pissed off and ready to get rid of it...
Good luck bro, I am planning a Forged 402 and am expecting numbers in the neighborhood of 500/500 hp/tq to the wheels. I have seen several plans of the guys who have done what I want, and with some tweaking should be able to duplicate their results or better. Can't understand why your 408 isn't anywhere close to what my 346 is doing. Very concerned that the dyno operator might have been ******* with you. Bad joke in my opinion. TECH Senior Member
iTrader: (3)
Joined: Apr 2006
Posts: 6,524
Likes: 1
From: Western Burbs of Detroit
Originally Posted by getusum
Whew, found out what the problem was.....I was running on 7 cyl....Found a bent prong on the coil.....fixed that and it runs like a champ....I'm coming to Houston next weekend....anyone know of a good place to tune with H/P and have use of a Dyno?..Guys, thanks for all the help...Hey Chris, you don't have to worry about your motor now.......
Phone number is in my sig. Ask for Bobby and setup a tuning session. Sean Burt is great. Hell Lou might even be available to tune it for you himself. Lou is meticulous when he tunes your car. Lou Gigliotti is the man. Good luck and hope you let LG Motorsports take a look at your tune. Tell them I (Doug) sent you and you might even get a discount. Talk to Bobby about it.
