Record All Motor LS1 Dyno Numbers
Thread Starter
Joined: Apr 2002
Posts: 5,231
Likes: 20
From: Houston TX
Record All Motor LS1 Dyno Numbers Well not really actually the complete opposite. I think I just set the record for lowest dyno numbers with a LS1 
235 or so on the first pull and 22X on the second. I just had my car tuned at MTI after the cam and heads went on and it made 420hp. I just installed a set of Kooks and a custom ORY. Ever since the headers and ory went on the car has been running like poop. It turns on just fine, idles fine, but as soon as I start to drive it there is a definitely a lack of power. No codes are being thrown, no weird engine noise or knocks.
One of the wires looked a little burnt and it was replaced on the dyno but it didn't solve anything. I replaced the spark plugs twice since the headers went on which was like two weeks ago.
Two things that did happen which I don't know if it led to this crap. After the headers were installed I drove the car about 10 miles open headers to the shop that was gonna build the ORY. The car was jerking and surging alot but I figured it was because of the lack of exhaust. Other than that I tried turning the car on after the install and I had forgot to plug in one of the coil pack harnesses. I drove it about 50 yards like that before I pulled over and saw the harness unplugged. Could either of these two things f@cked something up?
I don't know what else to look for other than pulling the valvecovers to see if I broke a spring on the way up to the shop. They are comp 921's and they don't have more than 1k miles on them along with the heads and new cam.
Any advise is greatly appreciated
235 or so on the first pull and 22X on the second. I just had my car tuned at MTI after the cam and heads went on and it made 420hp. I just installed a set of Kooks and a custom ORY. Ever since the headers and ory went on the car has been running like poop. It turns on just fine, idles fine, but as soon as I start to drive it there is a definitely a lack of power. No codes are being thrown, no weird engine noise or knocks. One of the wires looked a little burnt and it was replaced on the dyno but it didn't solve anything. I replaced the spark plugs twice since the headers went on which was like two weeks ago.
Two things that did happen which I don't know if it led to this crap. After the headers were installed I drove the car about 10 miles open headers to the shop that was gonna build the ORY. The car was jerking and surging alot but I figured it was because of the lack of exhaust. Other than that I tried turning the car on after the install and I had forgot to plug in one of the coil pack harnesses. I drove it about 50 yards like that before I pulled over and saw the harness unplugged. Could either of these two things f@cked something up?
I don't know what else to look for other than pulling the valvecovers to see if I broke a spring on the way up to the shop. They are comp 921's and they don't have more than 1k miles on them along with the heads and new cam.
Any advise is greatly appreciated
i would take it back to jason and see what he says and maybe he might be able to pull sumthin up that is tune related but before i try that i would go look over all of the connections and double check that everything is plugged in 02 sensors and wires plugs coils yada yada ect..... and then i would unplug the battery and let it sit for like 20 min to see if it reset everything
Thread Starter
Joined: Apr 2002
Posts: 5,231
Likes: 20
From: Houston TX
I've done everything but the battery recently but while it was in the shop getting the ORY built the battery was disconnected. I just pulled the valvecovers off and can't see any broken springs, rockers look fine and even installed a different set of coilpacks. Still no workie.
Thread Starter
Joined: Apr 2002
Posts: 5,231
Likes: 20
From: Houston TX
have it re dynoed and see what kinda power it is putting down on the low sie of the graph and see what ur afr is also when i added long tubes it felt like i lost a bit of low end but it wasnt alot though
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Thread Starter
Joined: Apr 2002
Posts: 5,231
Likes: 20
From: Houston TX
That's what I was thinking. I'm not sure what else to look for now. No funny noises from the engine, no broken springs, no DTC codes. It was working just fine until the headers went on.
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I'm betting you either have a bad exhaust leak around the collector or you fried your O2's. I'm not recommending this, but if you have tried going WOT and it ran fine, that just reinforces the O2 thing.
Diagnosing car problems on the web ftl.
Diagnosing car problems on the web ftl.
Thread Starter
Joined: Apr 2002
Posts: 5,231
Likes: 20
From: Houston TX
I'm gonna replace the passenger side o2 and see what that does. It did throw a code for it once but the guy tuning didn't seem to believe it would cause a 200hp loss. Just make sure though I will replace it.
Make sure you don't have the front O2 sensors plugged into the rear O2 harness. I've seen this happen on a C6. The Vette made terrible power. Owner plugged into the harness that was closer. To reach the front sensor wires, you typically need O2 entensions. It's probably not this, but I thought I would mention it anyway.
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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
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.
Thread Starter
Joined: Apr 2002
Posts: 5,231
Likes: 20
From: Houston TX
Make sure you don't have the front O2 sensors plugged into the rear O2 harness. I've seen this happen on a C6. The Vette made terrible power. Owner plugged into the harness that was closer. To reach the front sensor wires, you typically need O2 entensions. It's probably not this, but I thought I would mention it anyway.
I don't know what else to look at anymore. Even at WOT the fuel pressure stays around 53 so I don't think its fuel related. I pulled the valvecovers no broken springs or rockers. No engine noises. This has to be something tune related or electrical. I just don't know what could have happened for it to go from running perfect to installing a set of headers and it now running like ****.
Make sure you don't have the front O2 sensors plugged into the rear O2 harness. I've seen this happen on a C6. The Vette made terrible power. Owner plugged into the harness that was closer. To reach the front sensor wires, you typically need O2 entensions. It's probably not this, but I thought I would mention it anyway.
