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C5 514 rwhp . Sbe ls6 243 heads

Old 12-20-2018, 05:57 PM
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Default C5 514 rwhp . Sbe ls6 243 heads


Curious what everyones thoughts are on this . Found it on instagram . Sbe ls6 Prc 2.5 243s Btr 4 cam Ls6 intake Headers High reading dyno or doable ?
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Old 12-20-2018, 06:02 PM
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I think it's possible for sure, but would like to know the torque. If it had say 460 torque it is a generous dyno. If it has 430 torque and is peaking around 6800 rpm, I would say it's potentially legit
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Old 12-20-2018, 06:12 PM
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Originally Posted by Darth_V8r View Post
I think it's possible for sure, but would like to know the torque. If it had say 460 torque it is a generous dyno. If it has 430 torque and is peaking around 6800 rpm, I would say it's potentially legit

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Old 12-20-2018, 06:42 PM
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The first thing that gets me is the car still has the ls6 intake on it. I mean, any other details about car? Compression, fuel, etc. Seems a bit high for simple h/c.
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Old 12-20-2018, 07:12 PM
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Originally Posted by SoFla01SSLookinstok View Post
The first thing that gets me is the car still has the ls6 intake on it. I mean, any other details about car? Compression, fuel, etc. Seems a bit high for simple h/c.
93 oct . seems to be stock compression from the looks of the build
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Old 12-20-2018, 08:25 PM
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So as it seems to be nothing really special. It looks to be a mustang dyno. As Darth stated the tq is pretty high. Also note the pull stops before 6k. On the graph this thing is not done making power. The tq is barely dropping off at 6k. So if revved out it would have put 520-530whp? Lol.
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Old 12-20-2018, 09:49 PM
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So me and a few guys on Facebook have been talking .

Hed claiming the stock 28# injectors and fuel pump took him to 491 rwhp and were only at 100% duty .. this is impossiblw..a 28# injector can only flow X amount of fuel .

My stock 28# injectors were maxed at around 380 whp with a walbro 255 pump . Not a stock pump . And after looking at the guys YouTube page, well, yeah lol

I think the dyno is off over 100 hp .
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Old 12-20-2018, 10:00 PM
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Watch the vid. Anyone ever see a 500 hp LS take forever to get to 6k on a dyno?
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Old 12-20-2018, 11:21 PM
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Originally Posted by Darth_V8r View Post
Watch the vid. Anyone ever see a 500 hp LS take forever to get to 6k on a dyno?
Was thinking that too lol
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Old 12-20-2018, 11:56 PM
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Factory injectors would not get anywhere near close 491 rwhp. End of story boiiii
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Old 12-21-2018, 12:47 AM
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Originally Posted by Darth_V8r View Post
Watch the vid. Anyone ever see a 500 hp LS take forever to get to 6k on a dyno?
That thing is only going to trap about 117 mph
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Old 12-21-2018, 08:36 AM
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Sweet 420whp car
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Old 12-21-2018, 09:52 AM
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Originally Posted by subeone View Post
Factory injectors would not get anywhere near close 491 rwhp. End of story boiiii
BOIII im about to need more Cesar sauce soooooon
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Old 12-21-2018, 10:46 AM
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happy dyno...
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Old 12-21-2018, 10:16 PM
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347" 500 RWHP NA ,......
> 6500 RPM HP Peak, >11.5:1 Comp, LS6 Intake! LOL
Not a "Happy Dyno"
A Manic Dyno!
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Old 12-22-2018, 07:02 PM
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Originally Posted by Mavn View Post
So me and a few guys on Facebook have been talking .

Hed claiming the stock 28# injectors and fuel pump took him to 491 rwhp and were only at 100% duty .. this is impossiblw..a 28# injector can only flow X amount of fuel .

My stock 28# injectors were maxed at around 380 whp with a walbro 255 pump . Not a stock pump . And after looking at the guys YouTube page, well, yeah lol

I think the dyno is off over 100 hp .

man, i can't speak on this car, but i can speak on another done on a mustang dyno in nashville at delk performance.

the car made 325rwhp.

in the same weather a few days later the same car did some pulls in smyrna on a dynojet at a VERY reputable SCCA chevrolet shop. it struggled to make 305rwhp.

Delk performance mustang dyno has shown impossible results many times. parameters on a mustang dyno can be fooled with to show results you want.

never trust a mustang dyno for numbers either way. they are good for loading and tuning.
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Old 12-23-2018, 11:25 AM
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Straightline is indeed a Mustang Dyno and is NOT!!!! a happy dyno. I would guess that the car owner actually did 391 and susequently 414. I have had several engines tuned by them and SpeedInc over the last 15 years and there in no way that one made 5xx on a M.D. dyno.
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Old 12-23-2018, 05:10 PM
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On a Mustang dyno, doesn't the operator have to input a value for the vehicles weight and an aerodynamic drag factor?

​​​​​​Maybe a typo occurred entering the weight say something like 308 pounds instead of 3080 pounds.
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Old 12-24-2018, 12:33 AM
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Originally Posted by 99 Black Bird T/A View Post
On a Mustang dyno, doesn't the operator have to input a value for the vehicles weight and an aerodynamic drag factor?

​​​​​​Maybe a typo occurred entering the weight say something like 308 pounds instead of 3080 pounds.
My thoughts.
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Old 01-10-2019, 10:14 AM
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Originally Posted by subeone View Post
Factory injectors would not get anywhere near close 491 rwhp. End of story boiiii
Yeah math doesnt lie. We had a 2002 truck come in with bolt ons and the guy had a dyno sheet from a shop in Houston saying he made 420 or 430 sae hp and he was wanting to get more power out if it. When we looked at the truck and saw it stock injectors I told him it was impossible to make 420hp with his stock injectors plus it just had bolt ons. He got mad and said we were wrong, so I told him I would dyno it and if it made even 400hp it was free, if not he was paying full price. It barely made 300, lol. He was pissed!!!!


Originally Posted by 99 Black Bird T/A View Post
On a Mustang dyno, doesn't the operator have to input a value for the vehicles weight and an aerodynamic drag factor?



​​​​​​Maybe a typo occurred entering the weight say something like 308 pounds instead of 3080 pounds.
You can make a mustang dyno read anything with a few clicks.
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Last edited by LSX Power Tuning; 01-10-2019 at 10:29 AM.
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