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416 made horrible numbers!! What’s wrong?

Old 09-02-2018, 11:39 AM
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It's still not making anywhere close to the torque it needs to make. So, no, the intake might be hurting it uptop, but at 5k RPM it should be close to 480-500rwtq... not 350.
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Old 09-02-2018, 12:23 PM
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Originally Posted by poorhousenext
Look at the size of Throttle Body he has bolted on. Looks like he's 10mm smaller than what most are using here.

Also would like to see his air intake system feeding it. Does the filter size support the amount of air flow needed for Cubic in's too.

Read the Tq curve. It shows engine is carrying cam's design power band into 6500-7000 RPM range, flat lined for the most part.
Yup but the curve is too low.
Originally Posted by JakeFusion
It's still not making anywhere close to the torque it needs to make. So, no, the intake might be hurting it uptop, but at 5k RPM it should be close to 480-500rwtq... not 350.
Exactly. That's how you can tell it **** the bed.
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Old 09-02-2018, 03:01 PM
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[QUOTE=Darth_V8r;19960400]
Quote:
Originally Posted by poorhousenextLook at the size of Throttle Body he has bolted on. Looks like he's 10mm smaller than what most are using here.

Also would like to see his air intake system feeding it. Does the filter size support the amount of air flow needed for Cubic in's too.

Read the Tq curve. It shows engine is carrying cam's design power band into 6500-7000 RPM range, flat lined for the most part.[/QUOTE}
Yup but the curve is too low.
So are you saying the 92mm Throttle Body the OP listed, is not the cause of the TQ curve being so low?

That a 102 MM TB would not help get that Low Flat Lined TQ curve to rise higher, thus taking peak HP number with it?

Are maybe did you just focus in on Air Filter's area size might not be large enough to support engine size, and it's components only, an not as a possible contributor to OP's problem that might also need too be looked at as well?














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Old 09-02-2018, 08:23 PM
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Lmao the throttle body is not the issue man
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Old 09-02-2018, 09:32 PM
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Now introducing TBs that increase torque by 130ft-lbs!
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Old 09-02-2018, 09:40 PM
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Originally Posted by JakeFusion View Post
Now introducing TBs that increase torque by 130ft-lbs!
Also available with integrated tornado to introduce swirl. Guaranteed to double your fuel mileage and double your horzpower.
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Old 09-02-2018, 10:17 PM
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Originally Posted by ddnspider View Post
Also available with integrated tornado to introduce swirl. Guaranteed to double your fuel mileage and double your horzpower.
I have seen the tube collapse just before the tb or it could be in the exhaust somewhere. It's Not the TB or the ls3 intake. There's no vacillation in the lines at high rpm. A good indication of a strong and ridged valve train.
If the man says all ls3 stokers make this power. The mans dyno should be avoided like the plague.
Get to the track for hp numbers and show off the dyno graph for $treet racing. Let it EAT!

Last edited by handyandy496; 09-02-2018 at 11:08 PM.
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Old 09-02-2018, 11:45 PM
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Perhaps the throttle blade isn’t opening 100%? More like 60%?
Did you log the pulls by chance?
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Old 09-02-2018, 11:56 PM
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My throttle only opened 80% when I did a swap to a 92mm. Had to address that after mine felt sluggish. I’d look here. But a tuner should’ve and probably would’ve noticed you weren’t WOT
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Old 09-03-2018, 08:17 AM
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A LS3 intake shouldn't be interfering with the throttle cam, but that is easy to check and cross off the list. Intake tube collapsing is a good thought. I seen that kill a motor before. Ditch the intake and see if it rips harder. Another easy test.

I would get an IR gun to your headers or at least a water spray. Look for dead cylinders. Verify your engine grounds. Maybe run a jumper ground head to head to block to frame to battery. Do a compression test just in case as well.

It is easy to accuse dyno but you have a reference car you should easily outrun and are not.
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Old 09-03-2018, 10:01 AM
  #31  
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Originally Posted by ddnspider View Post
No the Dyno isn't the problem unless the operator put in the wrong inputs. No the injectors being flow matched isn't the problem unless 1 or more injectors flat out isn't turning on. No the intake manifold isn't the problem. When you're down 100 or more rwhp some is majorly wrong like missing cylinders or cam timing is WAY off.
This. If my tuner thought those numbers were normal for a 416ci LS, I’d be looking for a new tuner.
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Old 09-03-2018, 12:34 PM
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Originally Posted by KCS View Post


This. If my tuner thought those numbers were normal for a 416ci LS, I’d be looking for a new tuner.
thissss
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Old 09-03-2018, 01:01 PM
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Peak appears to be at 6000rpm... I would expect it be higher (intake or tb could be a cause for not carrying the band higher). The significantly low torque is concerning though (like others have mentioned). I like the temp readings on the primary tubes, good place to start, as well as pulling each plug for inspection.
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Old 09-03-2018, 01:10 PM
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Seriously. Those are numbers close with say a mild cam ls1. A 416? Damn. If he won't show you other files of other cars to compare with & he says that's normal. Find another dyno. Or go to track, or race somebody, or check over all your stuffs. You'll get it.
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Old 09-03-2018, 01:31 PM
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Not the dyno...

sounds like OP took a ride in another big cubic inch ls and his feels quite a bit slower.

something going on with the engine. What’s the timing and A/F look like?
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Old 09-03-2018, 06:14 PM
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Does OP have proof a 416 is in his vehicle ...? Seems to me like he got scammed
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Old 09-04-2018, 12:26 AM
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My cam only LS1 made 402 on that same dyno (LSXKilr) with a dorman intake a while back. It's not the dyno. Look into your setup.

KC Maxx is in town right up the road and (IMO) is the better shop and better tuner. If you need to validate your dyno readout, they have a 224x dynojet.

Judging by the normalish looking graph, I'd say it's running on 7 cylinders either electrically (fuel/spark) or mechanically (lifter), OR it has the wrong length pushrods in it. Hard to tell. What do the plugs look like?
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Old 09-04-2018, 02:03 AM
  #38  
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My 421 peaked at 5800 with the LS3 intake, and now peaks at 6900 after switching to the Lsxr mid runner.
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Old 09-04-2018, 02:28 AM
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Originally Posted by Mavn View Post
Does OP have proof a 416 is in his vehicle ...? Seems to me like he got scammed
your op
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Old 09-04-2018, 08:36 AM
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Originally Posted by big hammer View Post


your op
my 416 is not OP 416. My 416 is my 416 .
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