True HP rating of the LS1
07-17-2009, 01:54 PM
#2
seems like most 6sp cars make around 300-315rwhp. no two LS1's seem to make the same power from what ive seen, but im young and dumb. LOL.
take the high end, 315rwhp x1.2=378hp or so?
just my .02.
take the high end, 315rwhp x1.2=378hp or so?
just my .02.
07-17-2009, 01:57 PM
#3
Melting Slicks
it would be interesting to see what a stock LS1 gets on the new engine dynos. SAE recently changed the testing rules to get a more consistent reading across all manufacturers. as a result many advertised hp ratings changed. interestingly enough most import engines saw lower ratings under the improved guidelines, and most domestic engines got higher ratings.
it would be really interesting to see what current results are.
it would be really interesting to see what current results are.
07-17-2009, 02:02 PM
#4
Team Owner
350/375 2001 + mn6.
07-18-2009, 10:07 AM
#5
Melting Slicks
Member Since: Jul 2007
Location: Simpsonville SC
Posts: 2,939
Likes: 0
Received 4 Likes
on
4 Posts
St. Jude Donor '09-'10
the 345HP is refferring to flywheel HP. There are losses going through the drivetrain. My bone stock 99 with an automatic dynoed at a mere 275 HP the first time I had it checked.
(now it is double that
)
(now it is double that
)
07-18-2009, 10:14 AM
#6
Drifting
Member Since: Apr 2007
Location: Broward County Florida
Posts: 1,760
Likes: 0
Received 4 Likes
on
3 Posts
When I dyno'd my car after installing a catback I had 310rwhp 315rwtq. The shop said most sock C5s will dyno between 299 and 310. But horsepower is going to range even from LS1 to LS1. The answer to your question is too open ended. The only answers you could possibly expect would be averages.
07-18-2009, 10:14 AM
#7
Burning Brakes
315/0.85~370.6 hp
the 15% conversion factor for manuals needs to be factored in by divisor rather than multiplied.
but you got the right idea
Also, It's my belief that GM used that crappy 4 3/4" hole breathing stock air box to get the LS1 DOWN to 345hp(I've seen it posted on the forums as well so I won't take all the credit), as soon as you remove that terrible flow restriction, you'll find most people can pick up 15 rwhp just from a true CAI.
Last edited by JCamaro; 07-18-2009 at 10:19 AM.
07-18-2009, 10:17 AM
#8
Race Director
Typically - 15% drivetrain loss for the manual trans, about 20% for the automatic cars.
So take your flywheel HP or torque numbers (factory numbers) and divide by 1.15 and you'll be pretty close.
So take your flywheel HP or torque numbers (factory numbers) and divide by 1.15 and you'll be pretty close.
07-18-2009, 10:32 AM
#10
Safety Car
Member Since: Aug 2007
Location: This is not a Song, It's an Outburst: Or, The Establishment Blues; Sixto Diaz Rodriguez
Posts: 4,506
Likes: 0
Received 0 Likes
on
0 Posts
That's my understanding also, that 345hp is at the flywheel, just like I believe the cubic inch is actually 346, and not 350? 
07-18-2009, 01:17 PM
#13
Race Director
