Built ls3 with mods, low torque numbers
Thread Starter
Teching In
Joined: Jul 2018
Posts: 33
Likes: 0
Built ls3 with mods, low torque numbers Hi everyone!
we built ls engine for my friend’s drift car.
Engine is 6.2 liter, cylinder block is cast iron, bored to 4.030, wiseco domed pistons, stock crankshaft. Cylinder heads are LS3, cnc ported, camshaft is 281lrr-hr13, holey short ram ebay replica manifold, 102mm throttle body, headers. Compression ratio is 10.5:1. Engine management is Link G4+ Storm ecu.
After dyno tuning we got 433whp and 407wtq. These numbers are pretty low compared to previuos engine I built, it was 6 liter with lq4 cylinder heads.
Engine has only top end power, the headers becoming glowing after few runs on dyno or track, I’m suspecting that cam timing is wrong, what do you think?
Regards
we built ls engine for my friend’s drift car.
Engine is 6.2 liter, cylinder block is cast iron, bored to 4.030, wiseco domed pistons, stock crankshaft. Cylinder heads are LS3, cnc ported, camshaft is 281lrr-hr13, holey short ram ebay replica manifold, 102mm throttle body, headers. Compression ratio is 10.5:1. Engine management is Link G4+ Storm ecu.
After dyno tuning we got 433whp and 407wtq. These numbers are pretty low compared to previuos engine I built, it was 6 liter with lq4 cylinder heads.
Engine has only top end power, the headers becoming glowing after few runs on dyno or track, I’m suspecting that cam timing is wrong, what do you think?
Regards
TECH Senior Member
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
Trending Topics
Thread Starter
Teching In
Joined: Jul 2018
Posts: 33
Likes: 0
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
The link does work if you do a copy and paste. 
Anyway.....Goga, did you dyno the car before the cam swap? Knowing where you were versus where you are NOW would tell you a lot more than simply looking at the current peak numbers.
Also.....that 10.5:1 compression ratio is low for a cam with that much duration. Ideally, I'd want to be around 11.2 to 11.5:1 with that cam.
KW
Anyway.....Goga, did you dyno the car before the cam swap? Knowing where you were versus where you are NOW would tell you a lot more than simply looking at the current peak numbers.
Also.....that 10.5:1 compression ratio is low for a cam with that much duration. Ideally, I'd want to be around 11.2 to 11.5:1 with that cam.
KW
That power is low if it were a bolt on ls3.
You said that intake is a replica holley. I would take a close look at it for starters. Those intakes are for top end power. But at that power you have no power in general for what it is. Should easily go over 500whp if it's right.
You said that intake is a replica holley. I would take a close look at it for starters. Those intakes are for top end power. But at that power you have no power in general for what it is. Should easily go over 500whp if it's right.
TECH Senior Member
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
Thread Starter
Teching In
Joined: Jul 2018
Posts: 33
Likes: 0
The link does work if you do a copy and paste.
Anyway.....Goga, did you dyno the car before the cam swap? Knowing where you were versus where you are NOW would tell you a lot more than simply looking at the current peak numbers.
Also.....that 10.5:1 compression ratio is low for a cam with that much duration. Ideally, I'd want to be around 11.2 to 11.5:1 with that cam.
KW
Anyway.....Goga, did you dyno the car before the cam swap? Knowing where you were versus where you are NOW would tell you a lot more than simply looking at the current peak numbers.
Also.....that 10.5:1 compression ratio is low for a cam with that much duration. Ideally, I'd want to be around 11.2 to 11.5:1 with that cam.
KW
Thread Starter
Teching In
Joined: Jul 2018
Posts: 33
Likes: 0
That power is low if it were a bolt on ls3.
You said that intake is a replica holley. I would take a close look at it for starters. Those intakes are for top end power. But at that power you have no power in general for what it is. Should easily go over 500whp if it's right.
You said that intake is a replica holley. I would take a close look at it for starters. Those intakes are for top end power. But at that power you have no power in general for what it is. Should easily go over 500whp if it's right.
Thread Starter
Teching In
Joined: Jul 2018
Posts: 33
Likes: 0
dyno chart
TECH Senior Member
Joined: Jun 2016
Posts: 22,303
Likes: 3,619
From: Central Cal.
The reason you don't have power is you have an engine designed for strong midrange and an intake designed for top end power ONLY. Get rid of that intake and put an LS3 unit on there.
Also, the cam you have needs more static compression to be at its best.
Also, the cam you have needs more static compression to be at its best.
Thread Starter
Teching In
Joined: Jul 2018
Posts: 33
Likes: 0
only intake, and torque will jump up within 100 units?
Thread Starter
Teching In
Joined: Jul 2018
Posts: 33
Likes: 0
By the way, what about headers becoming glowing red?
check the header pic at cylinder 5 spark plug wire
Last edited by Goga Samsonadze; Jul 25, 2018 at 02:40 PM.