What's the highest HP/TQ number that a H/C LS1 can turn?

I know that LT1 with LE3 can turn 425-430RWHP.

I would like to see if the LT1 and LS1 come equal when modded with Head/Cam. I know stock to stock, the LS1 wins the HP/TQ numbers.

Don't get me wrong, this is not one of "who is better LT1/LS1".

I have a 383 LT1 with CNC ported heads, big cam, injectors and 58 Holley TB. Also, I have 2002 stock LS1 engine complete with PCM and harness and Comp Cams 224/230 on 114 LSA camshaft with RPM kit.

I am debating if I should sell the LT1 and swap the LS1 with camshaft and headers. Will the LS1 turn higher HP/TQ numbers, with that cam, than the 383 LT1. How about with a H/C package from TR or TSP.

It's a Hybrid Jeep for sand drags.

 

There have been a few over 500 rwhp, but most of the time, you'll see 450-480rwhp as opposed to 390-430 with the LT1 stuff. It all depends on the setup. My old setup was a 236/239 cam and Dart 225s, which turned 471 on the dyno through the Vette drivetrain. In an F-body, it would have been over 480.

Basically, the LS1 puts down cam-only numbers similar to a heads/cam LT1.

Mike

 

one of the main differences in the 2 engines are the cylinder heads, the LS1 heads simply move more air (in most cases) and make more power.
as far as h/c setup in the LS1 it is fairly easy to hit 450ish rwhp; my current street/strip car is making 453rwhp and 417rwtq, with Patriot Stg. 2 heads, one of our custom cams, Dynatech 1 7/8 race headers, LS6 intake. also this is through a 12 bolt with 4.33 gears.
one thing to remember is that the stock bottom end should not be spooled above 6500rpms, many people do it, but it is living on the edge if you do. the reciprical/geometric stress above 6500rpms is hard on the stock rod bolts.
again I know many people do it, I do it, but if the car is a daily driver or you can't afford to replace the engine I don't recommend going above the 6500rpms.

 

There's a nice database here.

Click on the links in the Model column to see mods and dyno results; click on the link in the 1/4 mile column to see timeslip details.

Enjoy.

 

I'm 13th on there. I should update my et I would be number 11.

 

i agree with mike

cam only LS1s put out about the same performance as most decent h/c LT1s

450rwhp is pretty easy for a h/c LS1...with good driveability too.

i'm hoping to get some Dart 205s on my car this summer...i'm really hoping for 450rwhp but i'm not sure i'll make it. i want the added low/mid range power of the 205s...so i'm gonna sacrifice a little top end.

 

I agree. Way back in the day when i had my 01 Z28 M6 i put down 422rwhp/396rwtq with bolt on' and G5X2! I've raced a few H/C LT1's and beat them with no problems.

 

Who makes the G5X2

 

LG Motorsports.

 

Comp Cams...

 

LG Motorsports makes the G5X2 along with the G5X3, etc.
http://www.lgmotorsports.com/catalog...oducts_id=1509

Mike

 

I make 436rwhp/420rwtq with "old" 5.7 heads, a nitrous cam, and I don't even have all the bolt-ons. My Z28 is getting a new clutch, bigger injectors and tune this week, so we'll see what happens... It's tough to beat a good H/C setup on an LS1 and the prices are starting to get almost reasonable.

 

those are nice respectable numbers. what are the specs on the cam?

at those levels i'd be willing to bet your maxing out your injectors on the duty cycle. so you may see a good gain from bigger ones.

keep us posted.

 

Does a H/C LS1 need bigger injectors or stock ones will be enough?

 

Depends on the heads and cam. Stock 28lb LS1 injectors are good up to around 450 horsepower at the flywheel. Beyond that and they'll be the limiting factor in your setup. Ideally, you'll only get your injectors up to 80 or 90% duty cycle, so it'd be best to upgrade your stockers well before you ever reach 450 bhp.

The only things bigger injectors can hurt are your pocketbook and your fuel economy.

Here's some good reading. There's a nice link in there too.