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Zig

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Do we know if 1:1 and are we assuming +20%?
 

Dave2013M3

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It would have been a tad higher if they were able to rev it to 7k+
 

Mustang406

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It would have been a tad higher if they were able to rev it to 7k+
If that is SAE correction factor than 428 from the auto is good. If that is standard then not so much. Wish they showed what correction factor they used.
 


AroDomi

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Iā€™m confused on why there is such a big difference in each dyno runs
 

Mustang406

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Iā€™m confused on why there is such a big difference in each dyno runs
These dynos are good for ballpark figures and talking points/bragging rights. Dynos need to be calibrated and no dyno has the same atmospheric conditions everyday. Also there are several different correction factors that will change the outcome
 
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rchandler9

rchandler9

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If that is SAE correction factor than 428 from the auto is good. If that is standard then not so much. Wish they showed what correction factor they used.
I would assume Hennessey would be using correction factor. They are kind of tuning/dyno experts. But who knows.
 

Mustang406

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I would assume Hennessey would be using correction factor. They are kind of tuning/dyno experts. But who knows.
I would assume they are using SAE correction but it doesn't say for certain. But that is definitely an auto so 428 is pretty good.
 

Gogoggansgo

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A couple things to note
1) much like ported manifold the gains from carbon trap removal seem to be all over the place, but one consistent thing Iā€™ve seen is big gains down low and itā€™s free so why not. Also porting plastic intake manifolds is kind of an art because while you can get a few hp smoothing everything out, most of the major gains you see ā€œ especially from the Boss and CJ intakesā€ is because the porter take the intake apart, epoxies the inside and smooths everything over. Itā€™s expensive and very time consuming but on cobra jet when done correctly itā€™s 20whp all day long. This is the main reason why you see conflicting results when guys port a stock manifold it comes down to the engine lottery. You could get a really crappy manifold with a lot of flash and bang 10-15hp because it wasnā€™t made very well. Or get an manifold that was made on a good day and gain absolutely nothing, Iā€™ve seen it both ways
2) the gen 4 coyotes both GT and dark horse are rated right on the money. The reason why you have a lot of people talking crap is because with the new tier 3 emissions, and how ford hit there Hp targets are by changing the powerband in much more progressive top end kinda of engine. Not a bad thing but it doesnā€™t exactly translate well into dyno graphs, it also didnā€™t help that the 18-21 gen 3 coyotes where kinda underrated, Iā€™m not saying theyā€™re making 500hp but really 470hp was a more appropriate rating for them. This is why the American muscle dyno comparison showed a 10whp gain over gen 3, where this gets interesting is the 22-23 gen 3s are nerfed significantly because of the carbon traps, the 450hp rating was much more realistic and why guys showed a 20whp drop over the previous gen 3s. Late model did a 22 vs 24 and it was a massive difference in favor of the 24 ā€œgen 4ā€ car

keep your expectations in spec and youā€™ll be happy
 

Dfeeds

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A couple things to note
1) much like ported manifold the gains from carbon trap removal seem to be all over the place, but one consistent thing Iā€™ve seen is big gains down low and itā€™s free so why not. Also porting plastic intake manifolds is kind of an art because while you can get a few hp smoothing everything out, most of the major gains you see ā€œ especially from the Boss and CJ intakesā€ is because the porter take the intake apart, epoxies the inside and smooths everything over. Itā€™s expensive and very time consuming but on cobra jet when done correctly itā€™s 20whp all day long. This is the main reason why you see conflicting results when guys port a stock manifold it comes down to the engine lottery. You could get a really crappy manifold with a lot of flash and bang 10-15hp because it wasnā€™t made very well. Or get an manifold that was made on a good day and gain absolutely nothing, Iā€™ve seen it both ways
2) the gen 4 coyotes both GT and dark horse are rated right on the money. The reason why you have a lot of people talking crap is because with the new tier 3 emissions, and how ford hit there Hp targets are by changing the powerband in much more progressive top end kinda of engine. Not a bad thing but it doesnā€™t exactly translate well into dyno graphs, it also didnā€™t help that the 18-21 gen 3 coyotes where kinda underrated, Iā€™m not saying theyā€™re making 500hp but really 470hp was a more appropriate rating for them. This is why the American muscle dyno comparison showed a 10whp gain over gen 3, where this gets interesting is the 22-23 gen 3s are nerfed significantly because of the carbon traps, the 450hp rating was much more realistic and why guys showed a 20whp drop over the previous gen 3s. Late model did a 22 vs 24 and it was a massive difference in favor of the 24 ā€œgen 4ā€ car

keep your expectations in spec and youā€™ll be happy
Speaking of porting, I also heard that the 22+ gen 3s (the ones that had the black IM and not the grey IM the 18-21 had) had a lot more, and consistent, casting imperfections which hindered power. Early gen 3s also had a viscous damper that was changed back to a harmonic balancer around 21/22 (possibly due to covid and supply issues). The gen 3 really got dialed back over the years in so many ways. Hopefully the gen 4 has the opposite experience.
Sponsored

 
 





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