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416 made horrible numbers!! Whatís wrong?

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Old 08-28-2018, 10:48 AM
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Default 416 made horrible numbers!! Whatís wrong?

Hello, I have an 01 trans am with an ls3 416 stroker. Just got done & put on a dyno & made 380ish to the wheels Which from what Iíve seen 416s usually make 500+. And the guy that tuned it said itís on a mustang dyno & has a stock ls3 intake & thatís usually what he sees 416s make. But I have a couple friends that have 416s and they made around 560 with a stock intake so I call Bullshit. What do you think? Iíll post all of the details about the car, which I know Iíll forget something so just ask and, keep in mind, Iím deff not a car guru, Still learning.

01 trans am
416 stroker built by Thompson motorsports, which build sheet is in the pictures
Stock ls3 intake
65 or 62 lb injectors
92mm NW throttlebody
ls3 CNC ported heads
T-56 6 speed with monster stage 4 clutch
MWC 9Ē 4.56 gears
Thank you for your opinions.





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Old 08-30-2018, 04:26 PM
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That's about 380rwhp? And 350tq?

What cam is in there? TMS assembled the long block?
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Old 08-30-2018, 05:17 PM
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Mustang dynos are heartbreakers. LS3 intake good to about 6500rpm (maybe).
My car made 460 on a mustang but ran a 9.91 @ 136. (It takes about 600rwhp to do that) with a LS3 intake.
Mustang dynos are great for tuning (much better than a Dynojet)) so don't get hung up on numbers.

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Old 08-30-2018, 05:17 PM
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How does the car feel? Either the dyno is reading very low or something is wrong. See if he has other numbers of other cars/combos to compare with. The shape of the graph looks good. Strong tq & the power carries well to about 6750rpm.
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Old 08-30-2018, 05:19 PM
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Doesn't look like mustang software. It's Land & Sea dynomite dyno. Had my car on one down here & it actually read a little higher than a dynojet.
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Old 08-30-2018, 05:45 PM
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See what it traps at the track first before assuming something
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Old 08-30-2018, 06:34 PM
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Sure all primaries are hot? Might be down 2 or 3 cylinders
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Old 08-30-2018, 07:20 PM
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Should be making 530 at the wheels. Something is wrong.
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Old 08-30-2018, 07:51 PM
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Unless the tune is really bad with like only 9 degrees timing and lean wouldn't see why it would only make this much
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Old 08-30-2018, 08:06 PM
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Originally Posted by JakeFusion View Post
That's about 380rwhp? And 350tq?

What cam is in there? TMS assembled the long block?
Those are around the numbers.

240 256 .625 .625 113+4
TMS assembled the short block and then I had the heads out on locally.
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Old 08-30-2018, 08:10 PM
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Originally Posted by SoFla01SSLookinstok View Post
How does the car feel? Either the dyno is reading very low or something is wrong. See if he has other numbers of other cars/combos to compare with. The shape of the graph looks good. Strong tq & the power carries well to about 6750rpm.
Well, I drove in a friends trans am with a 416, just to compare and his seemed to pull significantly harder.
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Old 08-30-2018, 08:22 PM
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That's a healthy cam. Should be at least 470 to the wheels assuming the pushrod length is right and all 8 cylinders are firing.

Time to check the plugs (getting spark on all 8?) heat gun works to see if there's a dead cylinder. If all are firing, time to pull the valve covers and check lifter preload and pushrod length.
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Old 08-30-2018, 08:26 PM
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What's your exhaust setup?

Its def shitting the bed
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Old 08-30-2018, 09:14 PM
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Originally Posted by Darth_V8r View Post
What's your exhaust setup?

Its def shitting the bed
1 7/8 speed engineering headers
3Ē true duals dumped right in front of rear tires.
Borla xr1 mufflers
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Old 08-30-2018, 10:04 PM
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What do you mean by 65 "OR" 62lb injectors? You don't even know what they are? So obviously you didn't get them flow matched. Big mistake. Could be your problem right there. If all 8 cylinders aren't running exactly the same, one or two rich/lean cylinders are gonna pull the entire engine down.
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Old 08-30-2018, 10:58 PM
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Hi there, When I first built my 421 earlier this year I used a stock LS3 intake on it and the truck went 10.80's and was out of air at only 5800. After talking to a few members I switched to a LSXR high hp intake and I'm now running 10.42 and it pulls as far as I want to push it. I traded some torque down low for horsepower up top which is a good trade off on a stroker and my ET reflects that. The stock LS3 intake is a fine piece for stock but a stroker requires more air.
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Old 08-31-2018, 12:11 PM
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Either you didn't get a 416. or its only firing on 4 cyl lol
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Old 09-01-2018, 12:43 PM
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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.
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Old 09-02-2018, 07:51 AM
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Intake is a problem but that’s not THE problem if the numbers are accurate
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Old 09-02-2018, 08:22 AM
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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.
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