: Differences between LS9 and LSA



poor-sha
01-18-09, 04:56 AM
I tried a search on this and failed so sorry if this is covered ground and I just missed it. Does anyone have a comprehensive list of the differences between the LS9 in the ZR1 and LSA in the CTS-V?

I know it has a smaller displacement supercharger (1.5L vs 2.3L I think) and I also don't think the LSA has forged pistons, but what else is different? Does the LSA use the same 3-layer head gaskets? Does it have the piston squirters of the LS9? Is the ECU the same?

I'm up early this morning and was just wondering aloud...

z71burb
01-18-09, 08:03 AM
lsa doesnt have the dry sump setup

poor-sha
01-18-09, 08:12 AM
Also, I'm curious to hear about how the power delivery compares between the two motors. I know Short-Throw has extensive seat time in both. I've heard that the ZR1 was very docile below ~4K RPM and comes on very strong beyond that point.

proexpert
01-18-09, 10:03 AM
LS9 has a bigger supercharger (2.3 L vs 1.9 L) and is hand built in Michigan. The LSA is built in Mexico. The LS9 compression ration is 9.1:1 and the LSA compression ratio is 9.0:1. That's all I could find today.

wait4me
01-18-09, 11:05 AM
Different blower, different rotating assembly, BIGGER cam, lighter valves. MOST if not all the gain though is in the better blower, the camshaft and the more aggressive tune, is the difference in horsepower between the two.. Most others where mearly to make the zr1 last longer at the higher hp levels.

Luna.
01-18-09, 01:07 PM
There are a LOT of differences, so much so, it's easy to wonder if the motors are even related. One of the biggest differences was that the LSA uses cast pistons, while the LS9 uses forged pistons.

I can't recall where I read the comprehensive list, but I'm thinking I found it as LS1tech.

GMX322V S/C
01-18-09, 03:47 PM
Compiled from GM Media Online (differences in bold):

http://i719.photobucket.com/albums/ww194/gmx322v/CTS-V/LSAvsLS9.png

GMX322V S/C
01-18-09, 03:58 PM
More: http://www.autoblog.com/2008/01/14/detroit-2008-2009-lsa-6-2l-superchar/

poor-sha
01-18-09, 04:42 PM
Thanks GMX. Good summary and I also found that article while digging through old posts.

V for victory
08-17-11, 09:33 AM
So I have a question, since many members have obtained and surpassed the 638 hp bench mark of the ZR1 with the LSA motor through countless set ups and modifications, would it be possible to remove the 1.9L supercharger and install the larger 2.3L on the LSA motor reasonably easy to produce a substantial hp gain without a whole lot of other mods. Of course a tune and long tube headers would probably be a must to accomplish this transformation for (air in/ air out). But other then all the Forged and titanium internals the LS9 motor has for longivity and abvious prestige is it do-able?

lunarx
09-04-11, 02:54 AM
Compiled from GM Media Online (differences in bold):

http://i719.photobucket.com/albums/ww194/gmx322v/CTS-V/LSAvsLS9.png

Is that correct that the LSA has the Piston Oil Spray Coolers?

Sent from my ADR6300 using Tapatalk

wait4me
09-12-11, 10:19 AM
Yes the lsa has piston oil spray.

cbloveday
09-12-11, 04:56 PM
Jess, Ben & I were talking compression Saturday and how the LS9 and the LSA had the same compression etc. etc.

The conversation then turned to me needing a different drag pak to handle my torque. :bonkers:

So I went from compression to depression. :)