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GM LS3 LS376/525 Crate Motor

 
Old 06-27-2018, 09:07 PM
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Still chasing issues, so I can't give a good number. The shop that "tuned it" did so with a leak, as they yanked the map sensor, and put it back in with out sealing it.
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Old 06-27-2018, 10:08 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?
Originally Posted by KW Baraka View Post
BTW....a friend of mine put the exact same engine in his '96 Impala. He pulled after about 3500 miles and installed a BTR cam with better drivability and more power as a result.
The ASA cam was relatively strong but with about 13* of overlap, it shook his 4300LB Impala a bit more than he liked, and often felt like the engine would stall when decelerating to a stop.

A cam with more duration, more lift and a bit wider LSA can make more power, be easier to tune and make for a better street driver. This is why I'd go with the base crate engine and upgrade that.

Best of luck whichever route you take!

KW
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Old 06-27-2018, 10:37 PM
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KW, it's true all you mention in cam changes would make more power, but the issue at hand was the 13 degree overlap. You would have to widen the LSA more than a "bit" to minimize the overlap in order to smooth the engine out enough to minimize the stalling issue.
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Old 07-03-2018, 12:19 PM
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I put a 525 in a C6Z that is a track only car - the graph and other info are in this thread:

https://ls1tech.com/forums/dynamomet...z-results.html

The temps run 210 coolant 240-250 oil depending on temp - but that's with a dry sump.

The ASA cam does not like it under 2500 rpm, lots of surging - if you keep the revs up it's fine if you lug it, not so much.

I put the first 500 miles on it varying the RPM to break it in and it was a lot of fun - but after that when I just punched the cruise in turning 1600 rpm it was bucky and surgey.
If you are looking for something with better street manners the Hot Cam is the way to go, for straight up track use go with the 525.
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Old 07-03-2018, 04:13 PM
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Originally Posted by LT-4Play View Post
I put a 525 in a C6Z that is a track only car.....The ASA cam does not like it under 2500 rpm, lots of surging - if you keep the revs up it's fine if you lug it, not so much......I put the first 500 miles on it varying the RPM to break it in and it was a lot of fun - but after that when I just punched the cruise in turning 1600 rpm it was bucky and surgey…...
This is exactly what my friend reported. He drives about 500 miles a month in his Impala and he REALLY didn't like that ASA cam.
Originally Posted by G Atsma View Post
KW, it's true all you mention in cam changes would make more power, but the issue at hand was the 13 degree overlap. You would have to widen the LSA more than a "bit"to minimize the overlap in order to smooth the engine out enough to minimize the stalling issue.
No, not really.

The cam in my '95 Impala (w/LS3) is the Lingenfelter GT1-1 cam....229*/242* w/114* LSA and 7.5* overlap....3.73 gears and 3200 stall TC. I daily drive this car with no issues at all.....love it!

Builds power up to 6600 RPMs and I'm just shy of 500hp to the wheels. We'll see if I can crack 500hp when I complete the head swap to the PRC-260 heads.

KW
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Old 07-03-2018, 04:59 PM
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With ls3s making in the 470whp range with bolt ons and similar tq I'd say you guys are a little off.
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Old 07-03-2018, 05:43 PM
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This engine combo is being used in NMCA drag race competition in a 3100 lb. car with driver. Best ET that i remember so far has been 10.02 at about 130 mph. They are required to run a spec fuel along with the tune controlled by GM and NMCA. They cannot do any tuning not even change parts because the engine is sealed.
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Old 07-04-2018, 01:22 PM
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Originally Posted by 2011grandsport View Post
This engine combo is being used in NMCA drag race competition in a 3100 lb. car with driver. Best ET that i remember so far has been 10.02 at about 130 mph. They are required to run a spec fuel along with the tune controlled by GM and NMCA. They cannot do any tuning not even change parts because the engine is sealed.
I've seen this class. I thought about trying it out when it was first announced but never did. It's a class that's focused on efficiency. 10.02 with 525 hp is impressive.
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Old 07-25-2018, 10:07 PM
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Originally Posted by Mavn View Post
Bobbys car does not help the OP one bit lmfao
I misread what he was asking.
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Old 08-07-2018, 05:40 PM
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Got the car back from Complete Street Performance in West Chester, PA. They did a great job smoothing out the idle, and tuning out the surging.

However, as others have said, in hindsight, I'd have gotten the base LS3 and then maybe... maybe gone with an aftermarket cam, maybe. I was aiming for a power bump, with GM factory reliability and street manners. The LS376 is not that, it is lude and loud, and has a lot more lope than I really want.

Going through stock iron exhaust manifolds, cats, 2.5 true duals to the rear with an x pipe, an m6 to a c4 independent rear it put down 416.21 HP. Through long tubes a 3" and putting the power to a stick axle it would definitely be a lot more.


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Old 08-09-2018, 02:08 PM
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Wow, those numbers are a little disappointing. At least you have a factory warranty. It sounds good, but I think it would be awesome with longtube headers.
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Old 08-09-2018, 02:40 PM
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Something is still way off in your tune most likely.
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Old 08-09-2018, 02:59 PM
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Originally Posted by HioSSilver View Post
Something is still way off in your tune most likely.
Stock manifolds and cats are likely costing him ~45-50rwhp on that combo. Hell maybe more. Not sure how much the IRS hurts, but 416 with all things being considered doesn't sound too far off when the same motor did 470 in another car here with a normal axle, quality headers, and bullet mufflers.

LS3s move a ton of air and need to breathe...Longtubes w/highflow cats, a cai, and a tune is worth 60+ rwhp on a STOCK motor, so I could only imagine how much they will help on a cammed one.
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Old 08-09-2018, 03:33 PM
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Iím sure the exhaust is hurting the power the most.

Maybe next year on the LTís. Car is running, Iím just going to drive it and enjoy whatís left of summer.

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Old 08-09-2018, 03:51 PM
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Originally Posted by Puck View Post
Stock manifolds and cats are likely costing him ~45-50rwhp on that combo. Hell maybe more. Not sure how much the IRS hurts, but 416 with all things being considered doesn't sound too far off when the same motor did 470 in another car here with a normal axle, quality headers, and bullet mufflers.

LS3s move a ton of air and need to breathe...Longtubes w/highflow cats, a cai, and a tune is worth 60+ rwhp on a STOCK motor, so I could only imagine how much they will help on a cammed one.
I went 11.0 on stock manifolds and cats...... Theres something else a bit off there
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Old 08-09-2018, 04:07 PM
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Without knowing the dyno or a baseline, the numbers don't sound so bad. With a 20% driveline loss, that comes out to 520 HP. With 15% = 489 HP. Who knows how much mechanic drag the C4 rear end adds or how pessimistic the dyno? The engine sounds healthy. Maybe some additional tuning may yield another 10-15 more horses, but unless there are any weird dips on your dyno sheet, I say just drive it and enjoy it.
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Old 08-09-2018, 04:37 PM
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A c4 rear isn't that big even if it's a dana 44 so it's not gonna soak up much power unless there are severe driveline angles.

if his exhaust is stock no doubt that's hurting it.....but wtf with stock exhaust on it.

The intake is no doubt hurting it also.

from what lazorlemon and i have done with 2 different bolt on ls3s this thing should have the capability of hitting 500whp fbo tuned up good.....maybe a little more on E85.
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Old 08-09-2018, 04:38 PM
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Wouldn't a 15% loss equated to around 460? I was figuring on 18%. The diff is a dana 44 with 3.45's


It's stock exhaust manifolds, the rest is not stock


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Old 08-09-2018, 04:49 PM
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The LS3 and the LS3/525 does not like a lot of timing. That could be part of the issue but this thing has to breath too. The other thing could be
you just have one of the lesser powered engines, you build a dozen and one just doesn't produce the numbers. The guys i know that are drag racing them
have done some extensive testing and are using a lot of light weight key drive line parts to make them go fast, after all they do compete against the Coyote stock class
from time to time.
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Old 08-09-2018, 04:56 PM
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This was the base line with the stock LS1

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