View Full Version : Built LS1 performance question


ckpitt55
06-28-2012, 11:54 AM
Hey gents,

Sorry for the newb-ish question, I still have a lot of reading and research to do. I'm eventually looking to do an LSx swap on my E36, and wanted to ask you guys what kind of performance / fuel mileage I could expect from a moderately built LS1/T56. My goal is roughly 450hp n/a, while still being practical and streetable. I've found a motor with the lunati 395 stroker kit / mild cam installed, and was wondering if something like this would be worth pursuing.

If anyone has any better/cheaper recommendations for achieving those goals though, I'm all ears. I still have a lot to learn with these motors. I appreciate your help.

-Chuck

TyCZ28
06-28-2012, 12:28 PM
with the right rear end gears you can still realistically squeak out low to mid 20's

conan
06-28-2012, 01:20 PM
Looking to go aluminum or iron block ? What is the stroke on that lunati crank to get the 395ci ?

ckpitt55
06-28-2012, 01:24 PM
most likely aluminum for the weight savings. not a huge difference but not insignificant. the stroke on the 395 kit is 4.125": http://www.lunatipower.com/Product.aspx?id=379&gid=187

TyCZ28
06-28-2012, 01:56 PM
NOT THAT ONE!! that compression is sooooo low your car will be dog down low.. whats your budget?

conan
06-28-2012, 04:03 PM
X2 ^^^
You want the compression around 10.5:1 / 11:1 for a N/A moter. Also a 4.125 stroke crank in a ls1 block is pushing the limits. If the machining isn't perfect = :bomb:

The iron blocks weigh 100-120 pounds more than the aluminum blocks so if weight is a consern go aluminum.
If the extra weight doesnt bother you I would start with the Iron 6.0L block (lq4 or lq9) and bore it .020 over and stick a 4" stroke rotating assemly in there getting you to 408ci. That with a good head/cam package, intake, and long tubes will get you past your 450hp goal N/A.

TyCZ28
06-29-2012, 12:16 AM
4.030 is a 408... i have one for sale =] 400 bucks for a fresh block, cam bearings, and an engine stand

FNSlow
06-29-2012, 01:44 AM
450 na is easy to get but if gas mileage is a big deal, why not supercharge or turbo it? You can get 450 whp with 30 mpg on a 6 speed

Sales4@Texas-Speed
06-29-2012, 11:44 AM
Just as an example my 01 Z06 has 450rwhp from a heads/cam 5.7l and I still got 27mpg on my last trip to DFW. Give us a call or send me a PM and I can get you a quote for a similar package as far as heads/cam goes.

ckpitt55
06-29-2012, 02:15 PM
450 na is easy to get but if gas mileage is a big deal, why not supercharge or turbo it? You can get 450 whp with 30 mpg on a 6 speed

true, power comes easy with f/i but i hate turbos and fitting a supercharger with the required plumbing under my hood becomes an issue (its a bmw 95 e36). i think a centrifugal blower with a custom bracket would be my only option as far as f/i goes, not really a headache i want to deal with on top of everything else related to the swap...fabbing motor mounts, trans mounts, headers, full exhaust, custom driveshaft, splicing harnesses, etc. not something i want to deal with initially anyway.


Just as an example my 01 Z06 has 450rwhp from a heads/cam 5.7l and I still got 27mpg on my last trip to DFW. Give us a call or send me a PM and I can get you a quote for a similar package as far as heads/cam goes.

I'll have to do that to pick your brain a bit, I'm no where near ready to purchase anything..just want to get my shit together so I have direction and am informed when it does come time to buy.


4.030 is a 408... i have one for sale =] 400 bucks for a fresh block, cam bearings, and an engine stand


I'll pm you after work for some more info.

thanks for all the replies, gents. i appreciate it.

FNSlow
06-29-2012, 03:49 PM
I understand it'd be a lot more work, it's just that gas mileage will drop quick on an n/a build. 450 isn't radical so you could probably still get low 20's cruising.

Sales4@Texas-Speed
06-29-2012, 05:10 PM
That is what we are here for. Give me a call and we can line out everything you need, I can even send an email with a quote for it all if needed.

BriancWS6
07-01-2012, 02:24 PM
My cars old setup which went 11.20s on the second shake down pass, and was a ~450rw setup, knocked off 24.86 mpg with 4.10s running the a/c and cruise control in hilly mountainous terrain! These cars can still achieve great fuel economy even when modded.

I8UR4RD
07-01-2012, 08:22 PM
you can always call AES and get the 398. great deal on a fantastic product. It may take a little longer, but consider they are also busy building top fuel engines and stuff as well. texas speed builds awesome motors too. its a win win.

ckpitt55
07-02-2012, 03:51 PM
My cars old setup which went 11.20s on the second shake down pass, and was a ~450rw setup, knocked off 24.86 mpg with 4.10s running the a/c and cruise control in hilly mountainous terrain! These cars can still achieve great fuel economy even when modded.

that's what i'm going for. i still plan on dd'ing the car when the weather favors it so maintaining those mpg's is somewhat important to me. i'd probably be running a 3.91 in the rear, not a big difference but might help a bit. how did you like the 4.10?

BriancWS6
07-04-2012, 10:36 PM
that's what i'm going for. i still plan on dd'ing the car when the weather favors it so maintaining those mpg's is somewhat important to me. i'd probably be running a 3.91 in the rear, not a big difference but might help a bit. how did you like the 4.10?
I loved the 4.10s. I installed them when I only had bolt ons, they were nice then too. I've had 4.30s since 08 when I installed the M9, love them as well :D