L83 power potential
Thread Starter
Teching In
Joined: Aug 2016
Posts: 2
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From: texas
L83 power potential Ok so I've seen a lot of the posts about the ZL1 and LT1/LT4 engines... What about some real world numbers for the L83 5.3.. No turbo or supercharger, naturally aspirated, with a cam swap and headers and a good tune..
I'm looking to drop one in a 69 nova that would be streetable but mostly ran at the track. It wouldnt have any cats, only large flowmasters... Still up in the air on keeping the VVT with the cam swap. Suggestions?
Also has anyone kept the factory vacuum pump and used it for a crankcase Evac?
I'm looking to drop one in a 69 nova that would be streetable but mostly ran at the track. It wouldnt have any cats, only large flowmasters... Still up in the air on keeping the VVT with the cam swap. Suggestions?
Also has anyone kept the factory vacuum pump and used it for a crankcase Evac?
On The Tree
Joined: Jan 2004
Posts: 166
Likes: 2
From: Bahrain
Ok so I've seen a lot of the posts about the ZL1 and LT1/LT4 engines... What about some real world numbers for the L83 5.3.. No turbo or supercharger, naturally aspirated, with a cam swap and headers and a good tune..
I'm looking to drop one in a 69 nova that would be streetable but mostly ran at the track. It wouldnt have any cats, only large flowmasters... Still up in the air on keeping the VVT with the cam swap. Suggestions?
Also has anyone kept the factory vacuum pump and used it for a crankcase Evac?
I'm looking to drop one in a 69 nova that would be streetable but mostly ran at the track. It wouldnt have any cats, only large flowmasters... Still up in the air on keeping the VVT with the cam swap. Suggestions?
Also has anyone kept the factory vacuum pump and used it for a crankcase Evac?
bolt ons i used are 1 7/8 headers, air aid cold air intake, and l86 intake and tb... cam i usually buy the btr l83 cam as you dont really need an aftermarket torque converter.. makes great power up to 6500 rpm. I tried one with the tsp vvt-sv cams and it made 8 hp less then the btr so i stuck to btr.
Thread Starter
Teching In
Joined: Aug 2016
Posts: 2
Likes: 0
From: texas
Not as great as I'd like.. that figures to be about 18% drivetrain loss going off of GM's rated flywheel hp (355 on gas) I do plan on using e85 for the added torque. We're any of your Dyno runs on e85?
really wanting to get 500- 550 flywheel hp. Is that feasible with this engine without power adders.
really wanting to get 500- 550 flywheel hp. Is that feasible with this engine without power adders.
On The Tree
Joined: Jan 2004
Posts: 166
Likes: 2
From: Bahrain
Not as great as I'd like.. that figures to be about 18% drivetrain loss going off of GM's rated flywheel hp (355 on gas) I do plan on using e85 for the added torque. We're any of your Dyno runs on e85?
really wanting to get 500- 550 flywheel hp. Is that feasible with this engine without power adders.
really wanting to get 500- 550 flywheel hp. Is that feasible with this engine without power adders.
For your goals.. Go with l86 or lt1 Gen v engine.. It would easily make over 500whp with ported heads cam and intake and good exhaust..
Last edited by Public Enemy; May 24, 2018 at 06:08 AM.
Which headers and cam?
Using L86 throttle body or L83?
What kind of torque are you seeing?
What kind of gains are you seeing from the L86 intake? Or are you using the LT1?
Thanks in advance for any help.
Not as great as I'd like.. that figures to be about 18% drivetrain loss going off of GM's rated flywheel hp (355 on gas) I do plan on using e85 for the added torque. We're any of your Dyno runs on e85?
really wanting to get 500- 550 flywheel hp. Is that feasible with this engine without power adders.
really wanting to get 500- 550 flywheel hp. Is that feasible with this engine without power adders.
Last edited by 00pooterSS; Jun 6, 2018 at 11:57 AM.
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i have tuned several l83 trucks with bolt ons and aftermarket cams... they make around 290whp stock, 315-320whp with tune and premium fuel... 350whp with boltons and 390whp with a cam. All cams come with VVT but you either need a phaser to limit the advance the retard or lock it 0 degree... i didn't make any power retarding an aftermarket cam on that engine... all runs were on a dynojet 224.
bolt ons i used are 1 7/8 headers, air aid cold air intake, and l86 intake and tb... cam i usually buy the btr l83 cam as you dont really need an aftermarket torque converter.. makes great power up to 6500 rpm. I tried one with the tsp vvt-sv cams and it made 8 hp less then the btr so i stuck to btr.
bolt ons i used are 1 7/8 headers, air aid cold air intake, and l86 intake and tb... cam i usually buy the btr l83 cam as you dont really need an aftermarket torque converter.. makes great power up to 6500 rpm. I tried one with the tsp vvt-sv cams and it made 8 hp less then the btr so i stuck to btr.
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Banned
Joined: Oct 2015
Posts: 293
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From: Texas
L83s are a nice little motors that produce great power. We have provided ported heads to LS1Cantu on here and has been 390-400whp FBO cam only truck intake, 430-450whp with our heads, ported MSD intake/Katech throttle body on E85 pretty aggressive cam that'll require some flycutting.
L83s are a nice little motors that produce great power. We have provided ported heads to LS1Cantu on here and has been 390-400whp FBO cam only truck intake, 430-450whp with our heads, ported MSD intake/Katech throttle body on E85 pretty aggressive cam that'll require some flycutting.
On The Tree
Joined: Jan 2004
Posts: 166
Likes: 2
From: Bahrain
I was doing 380whp with the above combo... the l86 intake/tb is worth around 10-15hp on top of that... a c7 intake will lose torque buy probably gain after 5000 rpm...
I think 400whp is doable with a street camshaft.
On The Tree
Joined: Jan 2004
Posts: 166
Likes: 2
From: Bahrain
to be honest i never ported l83 heads... its just his camshaft, 1 7/8 headers, 3 inch cut out and air aid cai.
I was doing 380whp with the above combo... the l86 intake/tb is worth around 10-15hp on top of that... a c7 intake will lose torque buy probably gain after 5000 rpm...
I think 400whp is doable with a street camshaft.
I was doing 380whp with the above combo... the l86 intake/tb is worth around 10-15hp on top of that... a c7 intake will lose torque buy probably gain after 5000 rpm...
I think 400whp is doable with a street camshaft.
Again thank you for the info. That's great to hear there is no torque loss, as you can see in my sig I pull a boat and even if I didn't I don't want torque loss, if there's a loss then efficiency is down and that range is where I drive normally so I don't want a huge MPG loss from a mild cam. Sounds like if it maintains tq down low it would probably hold mpg fairly well.
More importantly for me right now though is I'm wanting to do headers soon, is the stock exhaust real restrictive on these? How much gain are you seeing from the cutout? I'd like to find a used 6.2 (3.5") exhaust for my truck since I want it to make power but stay quiet. But how bad is the stock 2.75" exahuast?
Banned
Joined: Oct 2015
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From: Texas
On The Tree
Joined: Jan 2004
Posts: 166
Likes: 2
From: Bahrain
Again thank you for the info. That's great to hear there is no torque loss, as you can see in my sig I pull a boat and even if I didn't I don't want torque loss, if there's a loss then efficiency is down and that range is where I drive normally so I don't want a huge MPG loss from a mild cam. Sounds like if it maintains tq down low it would probably hold mpg fairly well.
More importantly for me right now though is I'm wanting to do headers soon, is the stock exhaust real restrictive on these? How much gain are you seeing from the cutout? I'd like to find a used 6.2 (3.5") exhaust for my truck since I want it to make power but stay quiet. But how bad is the stock 2.75" exahuast?
More importantly for me right now though is I'm wanting to do headers soon, is the stock exhaust real restrictive on these? How much gain are you seeing from the cutout? I'd like to find a used 6.2 (3.5") exhaust for my truck since I want it to make power but stay quiet. But how bad is the stock 2.75" exahuast?
So i guess its pretty restricted without have one.