Look at this Dyno, power drops at 5,200RPM - WHY?
06-09-2005, 05:13 AM
#61
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Originally Posted by obZidian
any news?
06-09-2005, 04:06 PM
#62
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Latest Results Replaced the motor mounts and tranny mount. Made a noticable difference in the vibration. The old mounts were hard as a rock and cracked. AZ desert heat is tough on rubber.
We ran the tank down to where it sputtered (almost empty) then
Poured in 2+ gallons of 104 Octane Race Gas.
Aftern idlinig for some time we drove around a bit hooked up to the laptop. Some dumps at a dead stop (boy what a dog now) and some WOT from a float through 3 gears up to 6k RPM.
The knock is still there
at the exact same levels.
NO CHANGE!
We ran the tank down to where it sputtered (almost empty) then
Poured in 2+ gallons of 104 Octane Race Gas.
Aftern idlinig for some time we drove around a bit hooked up to the laptop. Some dumps at a dead stop (boy what a dog now) and some WOT from a float through 3 gears up to 6k RPM.
The knock is still there
at the exact same levels.
NO CHANGE!
06-09-2005, 05:21 PM
#63
Originally Posted by Mark A. Rogalski
We ran the tank down to where it sputtered (almost empty) then
Poured in 2+ gallons of 104 Octane Race Gas.
Aftern idlinig for some time we drove around a bit hooked up to the laptop. Some dumps at a dead stop (boy what a dog now) and some WOT from a float through 3 gears up to 6k RPM.
The knock is still there
at the exact same levels.
NO CHANGE!
Poured in 2+ gallons of 104 Octane Race Gas.
Aftern idlinig for some time we drove around a bit hooked up to the laptop. Some dumps at a dead stop (boy what a dog now) and some WOT from a float through 3 gears up to 6k RPM.
The knock is still there
at the exact same levels.
NO CHANGE!
Originally Posted by NicD
Welcome to the 98s. False knock is a bitch, especially in that year f-body. It is not pinging on 19 degrees and it probably wasn't when it was set up higher either. Most people who are doing tuning know this by now about the 98s.
06-09-2005, 08:16 PM
#64
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Originally Posted by Mark A. Rogalski
The shop replaced the knock sensors with the upgraded version today. The gas is fine. Ran 2 tanks of RedLine fuel cleaner before today and was on its third during the Dyno today.
Re-Dyno'd and.... the problem remains the same. Knock and retard!
Re-Dyno'd and.... the problem remains the same. Knock and retard!
06-09-2005, 08:45 PM
#65
im willing to bet some sort of valve train noise is throwing off the knock sensors, do u have a way to desensitize them? i dont know the stock 98 settings but if they are any different from the others i would put in a later years data. are the 98's knock sensors located differently as well?
06-09-2005, 11:07 PM
#66
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Such a long thread here's the recap.
On startup when hot and taking off from a stop occasionally I would get a quick ping. Normal here in AZ from the heat. No other noise.
2 months ago I had an OEM rocker lose its bearings. Heard so much spin on the Crane 1.8 rocker kit, Crane springs, Crane pushrods, etc. I went with that. After the install Dyno (computer) showed knock retard. The shop tuned it down to 19 degrees. It still showed on the computer screen. At no time can you ever hear any pinging or typical knocking sounds from detonation. Since then to fix the knock I have had the following done:
Replaced intake to SLP LS6
Readjusted the lifters to Crane specs again
Replaced to the newer upgraded knock sensors
Ran two tanks of Lucas Top End fuel cleaner
Changed oil and filter (RedLince synthetic)
Readjusted the lifters again with Joe Vinci on phone
Ran 1 tank of RedLine fuel cleaner
New motor mounts and tranny mount
104 Octane Gas
Still is picking up a knock and is retarding the timing even more.
Next step is to repalce back to OEM (Harlands) lifters on the 27th and check for knock.
On startup when hot and taking off from a stop occasionally I would get a quick ping. Normal here in AZ from the heat. No other noise.
2 months ago I had an OEM rocker lose its bearings. Heard so much spin on the Crane 1.8 rocker kit, Crane springs, Crane pushrods, etc. I went with that. After the install Dyno (computer) showed knock retard. The shop tuned it down to 19 degrees. It still showed on the computer screen. At no time can you ever hear any pinging or typical knocking sounds from detonation. Since then to fix the knock I have had the following done:
Replaced intake to SLP LS6
Readjusted the lifters to Crane specs again
Replaced to the newer upgraded knock sensors
Ran two tanks of Lucas Top End fuel cleaner
Changed oil and filter (RedLince synthetic)
Readjusted the lifters again with Joe Vinci on phone
Ran 1 tank of RedLine fuel cleaner
New motor mounts and tranny mount
104 Octane Gas
Still is picking up a knock and is retarding the timing even more.
Next step is to repalce back to OEM (Harlands) lifters on the 27th and check for knock.
Last edited by Mark A. Rogalski; 06-10-2005 at 08:19 PM.
06-10-2005, 08:20 PM
#69
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Originally Posted by mrr23
thought it was a rocker that lost it bearings? i'm sure you meant rocker. keep us updated.
Last edited by Mark A. Rogalski; 06-10-2005 at 08:27 PM.
06-10-2005, 09:04 PM
#71
Did you ever perform a leak down?
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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
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LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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06-12-2005, 12:02 PM
#72
Originally Posted by jaberwaki
your post doesn't make any sence...
you say its his stock cam puttering out (at 54-5500) then post a graph of yours pulling to over 6000...
you say his set up is not wronge, but say your wifes car was making more power then his, before she put in the rockers...
with your mph on a stock cam i must assume you are spraying right?
well then the duel springs might be ok for you, but they are too much for his N/A stock cam ...
you say its his stock cam puttering out (at 54-5500) then post a graph of yours pulling to over 6000...
you say his set up is not wronge, but say your wifes car was making more power then his, before she put in the rockers...
with your mph on a stock cam i must assume you are spraying right?
well then the duel springs might be ok for you, but they are too much for his N/A stock cam ...
06-30-2005, 07:55 PM
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Just got mine done today, It does the same thing just like what mrr23 said just the stock cam petering out. I have stock every thing except a custom air intake,MAF ends
MTI throttlebody and a custom magnaflow exhaust setup, this is what I put down with some tunning started off taking out the superchips tune I had in and returning back to stock GM tune I put down 314.9HP/326.7TQ to the fourth pull getting out 337.7HP/346.8TQ In the end that is was Jeffs conclusion was as well.
MTI throttlebody and a custom magnaflow exhaust setup, this is what I put down with some tunning started off taking out the superchips tune I had in and returning back to stock GM tune I put down 314.9HP/326.7TQ to the fourth pull getting out 337.7HP/346.8TQ In the end that is was Jeffs conclusion was as well.
07-01-2005, 04:32 PM
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Originally Posted by vettenuts
So is that 20 HP increase the tune or did you install Crane rockers? What did you install for springs? Inquiring minds want to know 
07-08-2005, 04:01 AM
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Originally Posted by mrr23
you know, the stock cam can only go so far. hopefully mark will have something to report back with after the holiday.
I think it might be the left cat converter, the inside broken. I noticed some rattling when the car was in my garage and revving it up. Outdoors it is not noticeable. This might be the reason it is tripping the knock sensors.