415 LS3 dyno numbers
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 66
Likes: 23
From: NC
415 LS3 dyno numbers 
This is a race engine that's going in my tube chassis big tire bracket car. It has 13.75 compression and a CID 4500 intake. It made 683 hp @7000 and 581 tq @5300. the weather was 84 temp 77 hum 29.89 baro and a DA of 2068 ft. I had an issue with my vac pump, so when that is fixed it should make a little more.
Randy
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 66
Likes: 23
From: NC
The heads are GMPP CNC LS3's that I milled to 64cc. The cam is a 257/265 .650/.650 110 LS 106 IC hyd roller with BTR .660 spring kit, but I'm running soild lifters. The CID intake is the 4.5 version, and has had a slight amount of work done to it via CID instructions. I found a vac leak and I'm going to relocate the vac line from the valley to the valve cover, so that should help some on hp. I ran it on methanol and made 695, but I need more jet, which I didn't have, but the true test will be when I get to the track.
Randy
Randy
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 66
Likes: 23
From: NC
It's been a while since I posted, so I thought I'd post my track times.
60ft 1.190
330ft 3.556
660ft 5.551 @ 124.79 35 degs of timing
This is on 110 race gas and what I found interesting was on the dyno 25 degs of ignition timing is all it liked, but it only ran a 5.67 @121.5.
Increaseing the timing to 35 degs I picked up .12 in et and over 3 mph. who says LS3's don't like timing.
60ft 1.190
330ft 3.556
660ft 5.551 @ 124.79 35 degs of timing
This is on 110 race gas and what I found interesting was on the dyno 25 degs of ignition timing is all it liked, but it only ran a 5.67 @121.5.
Increaseing the timing to 35 degs I picked up .12 in et and over 3 mph. who says LS3's don't like timing.
It's been a while since I posted, so I thought I'd post my track times.
60ft 1.190
330ft 3.556
660ft 5.551 @ 124.79 35 degs of timing
This is on 110 race gas and what I found interesting was on the dyno 25 degs of ignition timing is all it liked, but it only ran a 5.67 @121.5.
Increaseing the timing to 35 degs I picked up .12 in et and over 3 mph. who says LS3's don't like timing.
60ft 1.190
330ft 3.556
660ft 5.551 @ 124.79 35 degs of timing
This is on 110 race gas and what I found interesting was on the dyno 25 degs of ignition timing is all it liked, but it only ran a 5.67 @121.5.
Increaseing the timing to 35 degs I picked up .12 in et and over 3 mph. who says LS3's don't like timing.
What does your car weigh?
I experimented with timing also and found my LS3 engine liked 29 total. Have you verified TDC on the balancer with an indexed pointer and a timing light?
I find it interesting so many run low ignition timing on the LS3, claiming efficient chambers etc. for their reasoning. I see a lot of higher end build SBC and BBC with 9*, 10*, 11*, 12* heads and very small, efficient modern day chambers that look very similar to the 'trick of the week' CNC LS3/LS7 chamber and they make the best power at 30* plus. Go figure.
I've always had best power on short stroke ls3 at 28*, and long stroke at 28*-30*. LS7 I haven't played around with yet but I hear people referencing only 20* for best power sometimes and that is shocking to me, but we'll see.
35 degrees I've never heard of, especially on gas. I agree maybe TDC marking is off. Regardless, you now know what the engine likes so no real need to worry about it lol.
35 degrees I've never heard of, especially on gas. I agree maybe TDC marking is off. Regardless, you now know what the engine likes so no real need to worry about it lol.
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I did a chassis and engine dyno on my cammed LS7 it like 29 or so degrees on engine dyno and 25 degrees on the chassis dyno. It had 12 to 1 compression and a 246 / 258 on a 114 cam 650 lift. This was on 93 pump gas. This was a stroked LS7 at 4.125 stroke (455 CID). It made 757 hp at 6,700 and 657 tq at 5,000. Brodix BR7 heads done by Advanced Induction.
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Verdad Gallardo I did a chassis and engine dyno on my cammed LS7 it like 29 or so degrees on engine dyno and 25 degrees on the chassis dyno. It had 12 to 1 compression and a 246 / 258 on a 114 cam 650 lift. This was on 93 pump gas. This was a stroked LS7 at 4.125 stroke (455 CID). It made 757 hp at 6,700 and 657 tq at 5,000. Brodix BR7 heads done by Advanced Induction.
It was 757 hp (6,700 rpm) on the motor and 606 hp (6,400 rpm) at the tire which we had some old tire slippage (based on mph/rpm) I would say probably 620 hp with a good tire. It is in a C6 Corvette with a T6060 transmission and a 3.90 gear with a Wavetrack (which will read about 3% less than a stock 3.42 OEM rear). Probably lost a few hp going from 29 degrees down to 25-26 degrees.
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Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 66
Likes: 23
From: NC
What does your car weigh?
I experimented with timing also and found my LS3 engine liked 29 total. Have you verified TDC on the balancer with an indexed pointer and a timing light?
I find it interesting so many run low ignition timing on the LS3, claiming efficient chambers etc. for their reasoning. I see a lot of higher end build SBC and BBC with 9*, 10*, 11*, 12* heads and very small, efficient modern day chambers that look very similar to the 'trick of the week' CNC LS3/LS7 chamber and they make the best power at 30* plus. Go figure.
I experimented with timing also and found my LS3 engine liked 29 total. Have you verified TDC on the balancer with an indexed pointer and a timing light?
I find it interesting so many run low ignition timing on the LS3, claiming efficient chambers etc. for their reasoning. I see a lot of higher end build SBC and BBC with 9*, 10*, 11*, 12* heads and very small, efficient modern day chambers that look very similar to the 'trick of the week' CNC LS3/LS7 chamber and they make the best power at 30* plus. Go figure.
10 Second Club
Joined: Aug 2010
Posts: 4,465
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From: Harford Co. Maryland
I agree with trying to add some timing...all I heard was go with 30*
I started at 32, went up 2 every pass, and at 34* I got my best ET, 36* got my best MPH, and 38* it slowed down a lot. I stuck with 35*
LY6 clone, 10.8:1, cammed
I started at 32, went up 2 every pass, and at 34* I got my best ET, 36* got my best MPH, and 38* it slowed down a lot. I stuck with 35*
LY6 clone, 10.8:1, cammed