Not sure where to post this, but is this a problem or normal?
12-21-2004, 03:20 PM
#1
Not sure where to post this, but is this a problem or normal? Well as I was aproaching the trap/end of track, the car's rpms pretty much floated around 6500 rpms. Not sure if something is wrong or if its normal. On the 1-2 shift it pulls until I need to shift, on the 2-3 its the same, but in 3rd close for me to shift, the rpms just floated instead of increasing. Is this normal? If so, is it something I have to deal with, or can it be fixed? If its a problem/issue, what do I need to do? Thanks.
12-21-2004, 03:29 PM
#2
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Do you hear any popping from the exhaust or anything? My car would sometimes float the valves, always did it the worst at the top of third crossing the traps. The RPM would kind of hover in one spot and I would get alittle popping. Might be time for a new set of valve springs.
12-21-2004, 03:47 PM
#3
If you were experiencing a lean condition by running the stock MAF (ie not letting your motor relearn the combination), you will not make power up high. Put some miles on it, let your l-trims settle down, then go back to the track.
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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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
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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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
12-21-2004, 05:39 PM
#4
GM Muscle, I didnt noticed any popping. Is it something that you can definately hear, or do you really have to listen for it? I dont its the valvesprings, but I could be wrong. The cam/valvetrain probably have 5k miles on them. The rpms would hover though around 6500 rpms.
Patrick G, someone here on the board said that it didnt matter if the computer relearned everything because it doesnt affect the WOT conditions. Not sure if its right or not, just wanted to throw it in the picture.
Patrick G, someone here on the board said that it didnt matter if the computer relearned everything because it doesnt affect the WOT conditions. Not sure if its right or not, just wanted to throw it in the picture.
12-21-2004, 05:53 PM
#5
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What gears are you running? What is your 1/4 trap speed? What size tires are you running? What RPM is your converter?
Do you have a log of the run?
Without more info it sounds like your converter is slipping and allowing your engine RPM to stay at a level where the converter is hydraulically coupled. As you run down the track and your speed increases the RPM of the drive shaft/ trans output shaft catches up with your engine RPM.
I had a 4000 converter that did the same thing. As it turned out my 4000 was really a 4800-5000. Mine was doing the same thing.
John
Do you have a log of the run?
Without more info it sounds like your converter is slipping and allowing your engine RPM to stay at a level where the converter is hydraulically coupled. As you run down the track and your speed increases the RPM of the drive shaft/ trans output shaft catches up with your engine RPM.
I had a 4000 converter that did the same thing. As it turned out my 4000 was really a 4800-5000. Mine was doing the same thing.
John
12-21-2004, 06:31 PM
#6
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Originally Posted by BlackBeaSSt
GM Muscle, I didnt noticed any popping. Is it something that you can definately hear, or do you really have to listen for it? I dont its the valvesprings, but I could be wrong. The cam/valvetrain probably have 5k miles on them. The rpms would hover though around 6500 rpms.
Patrick G, someone here on the board said that it didnt matter if the computer relearned everything because it doesnt affect the WOT conditions. Not sure if its right or not, just wanted to throw it in the picture.
Patrick G, someone here on the board said that it didnt matter if the computer relearned everything because it doesnt affect the WOT conditions. Not sure if its right or not, just wanted to throw it in the picture.
12-21-2004, 07:46 PM
#7
Originally Posted by BlackBeaSSt
Patrick G, someone here on the board said that it didnt matter if the computer relearned everything because it doesnt affect the WOT conditions. Not sure if its right or not, just wanted to throw it in the picture.
__________________
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
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12-21-2004, 09:46 PM
#8
JNorris, 4.11 gear, 1.58, 7.11 @ 96.40, 11.22 @ 116.9, 26x10x15 ET Drags at 13 psi cold, Yank PT4400, no log of the run because I dont have Autotap or a laptop.
Patrick G, again, I was just passing on what I was told and wanted to get your side of it. But thank you for your input.
Patrick G, again, I was just passing on what I was told and wanted to get your side of it. But thank you for your input.
12-21-2004, 10:12 PM
#9
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With 4.11 gears and a 26" tire you RPM should be around 6300 at 117 mph. That is not factoring converter slippage which would be minimal at that RPM.
Your numbers seem normal to me based on the additional information.
John
Your numbers seem normal to me based on the additional information.
John
12-22-2004, 02:27 PM
#10
So does anyone have an idea what it could be? Is it converter slippage or another issue? I dont think its the tranny going away becasue its practically new. It maybe has 30 11 sec. passes on it and very little in town miles on it.
12-23-2004, 06:16 PM
#12
You're probably running out of motor too. Remember, that small cam of yours makes peak power around 6000 rpm and is most certainly done by 6500. You shouldn't expect it to pull very hard in 3rd once you pass 6400 rpm, especially when running a different size MAF with no relearn miles on it.
__________________
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.