H/C garage install progress
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
It's the secondary AIR system. This code indicates both banks so you may have either a wire off/fuse/etc. so it isn't powering up "or" check the rubber hose that comes out from the wheel housing under the master cylinder and connects to the metal tube under the master cylinder. If this is off this code would also set. Bad O2's or check valves can cause this as well, but likely the pump isn't running.
Pro
Joined: Feb 2003
Posts: 623
Likes: 11
From: Ankeny IA
It seems to be pulling stronger now that I've run it for a couple days. There is a noticeable increase in power above about 4500 rpms and it doesn't stop pulling, I'll need to adjust the rev limiter. If a tune will give me a bit more low end response then I think I'll be quite happy with this setup. Looks like headers are next.
Pro
Joined: Jan 2005
Posts: 559
Likes: 1
From: Lenexa Kansas
My first impressions are very disappointing, it doesn't seem to have any more power than it used to. I didn't take it past 3K rpms but I was expecting *something* down low. Hopefully the computer will adjust soon. It does sound and feel a bit "healthier" but it is hard to quantify.
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
Kermit (just kidding), first off, the cam you put in typically doesn't put out any more torque than stock until well over 3k rpm. I saw another member's before/after dyno graph, and he didn't pick anything up until 3,500, I believe. Second, when I put in my head/cam combo, before I got her tuned, it felt exactly the same. I didn't get on it at all, but within a normal driving rpm range, with 1/4 throttle, I was feeling absolutely no difference. After the tune, I could tell a ton of difference. The before/after dyno graph showed a good 50lb ft of torque at 2,500rpm, and you could feel it. But without a tune, it just didn't seem to be there. Wait till you get her tuned up, and get the rpm's up. I guarantee you'll be singing its praises once you have it cranked up over 4,000rpm.
Any advice on how high I should set the fuel cutoff with this cam? I am currently hitting the stock limiter and it still wants to pull hard. I was thinking 6400 rpms would be a nice safe number.
Team Owner
Joined: Jan 2004
Posts: 22,185
Likes: 65
From: NJ
Most H/C Vettes make more HP than torque, its the kind of power wont feel down low. Once you cross the more HP than torque line by a decent amount, the cars characteristics change big time.
Last edited by Chevy Guy; Jul 28, 2007 at 09:03 AM.
Pro
Joined: Jan 2005
Posts: 559
Likes: 1
From: Lenexa Kansas
I don't know that you can attribute a milder low-end to the spread in hp and torque. He's probably looking at a 20 point spread between torque and hp (according to Thunder Racing's site, and other posts on this and the LS1tech forum). I am at a 20 point spread (390/410) with my setup, and I have all kinds of fun torque down low.
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
I don't know that you can attribute a milder low-end to the spread in hp and torque. He's probably looking at a 20 point spread between torque and hp (according to Thunder Racing's site, and other posts on this and the LS1tech forum). I am at a 20 point spread (390/410) with my setup, and I have all kinds of fun torque down low.
Team Owner
Joined: Jan 2004
Posts: 22,185
Likes: 65
From: NJ
I don't know that you can attribute a milder low-end to the spread in hp and torque. He's probably looking at a 20 point spread between torque and hp (according to Thunder Racing's site, and other posts on this and the LS1tech forum). I am at a 20 point spread (390/410) with my setup, and I have all kinds of fun torque down low.
390/410 ain't so bad. What does your dyno sheet look like? Peak torque numbers mean little without knowing what the curve looks like. Most larger aftermarket cams shift power higher in the RPM range and almost always at the detriment of low RPM, street style drivability. A good tune can get a lot of that low range back.
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Pro
Joined: Jan 2005
Posts: 559
Likes: 1
From: Lenexa Kansas
390/410 ain't so bad. What does your dyno sheet look like? Peak torque numbers mean little without knowing what the curve looks like. Most larger aftermarket cams shift power higher in the RPM range and almost always at the detriment of low RPM, street style drivability. A good tune can get a lot of that low range back.
Before/After
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
Dyno sheet at last.
I had Synergy do the tune and so far I've been pretty happy with the results:
I'm amazed at how much my mileage went up, at least 30% (higher on the highway). The car pulls very linearly though I would have liked a bit more low end. On a terribly slick track I shaved off over .6 seconds with more wheel spin than I had before. Looks like headers are next
.
I'm amazed at how much my mileage went up, at least 30% (higher on the highway). The car pulls very linearly though I would have liked a bit more low end. On a terribly slick track I shaved off over .6 seconds with more wheel spin than I had before. Looks like headers are next
.