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GM LS3 LS376/525 Crate Motor

 
Old 10-11-2018, 09:31 PM
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A regular production ls3 with just dyno headers on an engine dyno is almost 500 hp

http://www.superchevy.com/how-to/eng...ick-boomerang/
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Old 10-12-2018, 12:15 AM
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Originally Posted by big hammer View Post
A regular production ls3 with just dyno headers on an engine dyno is almost 500 hp

http://www.superchevy.com/how-to/eng...ick-boomerang/
Thanks for posting this article!

I had read that article a while back but I was paying attention to the aftermarket cams. I did not connect the dots. This quote from their testing says it all:
the LS3 crate motor was configured on the dyno with a set of long-tube headers, a complete Aeromotive fuel system, and tuned to perfection with the Holley Performance HP EFI system. Not surprisingly, the stock cam offered plenty of idle vacuum (over 20 inches) and acceptable peak power numbers. The baseline pulls produced peak numbers of 496 hp at 5,800 rpm, and 491 lb-ft of torque at 4,700 rpm. The measure piston-to-valve clearance exceeded .150, meaning, it was more than adequate for performance use.
I have also asked the dealer who I bought the 525 from to go back and ask GM Performance. If they are advertising Net HP on the stock crate and Gross HP on the other Crates, as demonstrated by this SuperChevy test, that is highly misleading.
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Old 10-12-2018, 07:46 AM
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Originally Posted by big hammer View Post




no im correct. The 525 is not an SAE net rating.
It's not net. But it's also not gross.
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Old 10-12-2018, 10:47 AM
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Originally Posted by Marc 85Z28 View Post
It's not net. But it's also not gross.
What is it then? Not being a smartass, just want to know...
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Old 10-12-2018, 11:58 AM
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Originally Posted by G Atsma View Post
What is it then? Not being a smartass, just want to know...
Go back and read?
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Old 10-12-2018, 03:56 PM
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Instead of your snarky answer, it would have been easier to just say which measuring method was used. Thanks for nothing.
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Old 10-13-2018, 11:35 PM
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Originally Posted by rdymond View Post
Thanks for posting this article!

I had read that article a while back but I was paying attention to the aftermarket cams. I did not connect the dots. This quote from their testing says it all:


I have also asked the dealer who I bought the 525 from to go back and ask GM Performance. If they are advertising Net HP on the stock crate and Gross HP on the other Crates, as demonstrated by this SuperChevy test, that is highly misleading.
yes it is and the 525 really kinda sucks lol
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Old 10-21-2018, 06:44 PM
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Originally Posted by Norbit2 View Post
So, after all that, does anybody have a stock crate 525 motor in their car?
My buddy Bob has one in his 67 GTO. I think it made 440rwhp.

Another option is to get the 430hp LS3 and install a different cam. Another buddy did just that in his 66 Fairlane. The car is over 4000 pounds with him in it and it rips!!! Ran [email protected] at LS Fest.

Andrew
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Old 10-21-2018, 07:11 PM
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Originally Posted by Project GatTagO View Post
Another option is to get the 430hp LS3 and install a different cam.
I think that is by far the best way to go
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Old 10-23-2018, 12:29 AM
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Originally Posted by Project GatTagO View Post
…..Another option is to get the 430hp LS3 and install a different cam.....
As previously stated in post #12 of this thread.

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Old 10-23-2018, 09:39 PM
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Originally Posted by lees02WS6 View Post
I'm going to add long tubes and rework the exhaust, starting the work in November. We'll see how much that changes the power output. I'm adding a pair of 22" resonators, and moving the magnaflow mufflers to the rear just ahead of the tips, keeping the cats.

Anxiously awaiting the next set of results!!!
When you say you have cats, do you have stock cats or high flow cats? If you want to keep cats, I did as well and will be using them with the LS3 you NEED a set of high flow cats. I am using American Racings high flow catted Y.

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Old 11-26-2018, 04:22 AM
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Back to the original post, just completed an LS1 to a crate LS3 376/525 swap in a 98 T/A. Sent the computer out and had it tuned for the LS3 . Very disappointed . Runs like **** so far. Will keep working away and get it figured out and keep you posted.
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Old 11-26-2018, 12:02 PM
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I wonder if he tuned it for a 430HP LS3? That WOULD mess it up!
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Old 11-26-2018, 12:46 PM
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Originally Posted by P31Jeff View Post
Back to the original post, just completed an LS1 to a crate LS3 376/525 swap in a 98 T/A. Sent the computer out and had it tuned for the LS3 . Very disappointed . Runs like **** so far. Will keep working away and get it figured out and keep you posted.
i had my 911 with the 525 out for its first AutoX about 3 weeks ago. The engine made tons of power at rev, however it stalled often and was hunting at idle. It will go back to the tuner for adjusting idle and low rpm behaviour. I am hoping to improve its street manners.
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Old 11-26-2018, 01:26 PM
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Tuner was given ALL the details of the car and engine. Just wondering if the computer has to do some learning on its own ? We did change the throttle body to drive by cable . But the tuner new that . And we are running long tube headers with no cats so only 1 02 sensor per side. Sits there and idles fine but the throttle response is terrible even in neutral.
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Old 11-26-2018, 04:57 PM
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Originally Posted by P31Jeff View Post
Back to the original post, just completed an LS1 to a crate LS3 376/525 swap in a 98 T/A. Sent the computer out and had it tuned for the LS3 . Very disappointed . Runs like **** so far. Will keep working away and get it figured out and keep you posted.
Cam.....has.....too.....much.....overlap.

You either need a dyno/street tune or a more smartly spec'ed cam. But a mail-order tune just won't cut it unless it's derived from a dyno/street tune from a similarly spec'ed cam.

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Old 11-26-2018, 05:08 PM
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ASA cam used on the street = a good lamp post....
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Old 11-26-2018, 09:34 PM
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Originally Posted by KW Baraka View Post
Cam.....has.....too.....much.....overlap.

You either need a dyno/street tune or a more smartly spec'ed cam. But a mail-order tune just won't cut it unless it's derived from a dyno/street tune from a similarly spec'ed cam.

KW
This, a million times this. This cam hates being lugged (anything under 2k rpm), I can only imagine what it must be like running it with an auto. It likes a high idle 850-950, has a very pronounced lope, and the unburned hydrocarbons are very noticeable.
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Old 11-26-2018, 10:06 PM
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Originally Posted by lees02WS6 View Post
This, a million times this. This cam hates being lugged (anything under 2k rpm), I can only imagine what it must be like running it with an auto. It likes a high idle 850-950, has a very pronounced lope, and the unburned hydrocarbons are very noticeable.
There is quite a bit of hyperbole in the above statements. I run the ASA cam in a 5.3L Gen IV engine. I have a HiRam intake with huge runners and two (2...!) 87mm throttle bodies on top. I have a T56 and 4.33 gears....but, I always take off in second gear on the street, unless I am on a hill. I have it idling very nicely with a target idle RPM of 825. I can lug it down to 1200rpm on the highway and it does not protest. It does have a very nice lope at idle. I have taken care of the unburned hydrocarbon issue by adjusting the injector end angle, which really helps. By timing the fuel injection pulse in time with the valve events, the "fuel" smell at idle is greatly reduced.

In short, with good tuning, this cam is a ***** cat...

Andrew
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Old 11-26-2018, 10:09 PM
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Originally Posted by KW Baraka View Post
Cam.....has.....too.....much.....overlap.

.....
The ASA cam only has 11 degree of overlap...that's almost nothing...

Andrew
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