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.It would have been a tad higher if they were able to rev it to 7k+
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 outcomeIām confused on why there is such a big difference in each dyno runs
I would assume Hennessey would be using correction factor. They are kind of tuning/dyno experts. But who knows.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 they are using SAE correction but it doesn't say for certain. But that is definitely an auto so 428 is pretty good.I would assume Hennessey would be using correction factor. They are kind of tuning/dyno experts. But who knows.
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.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 Iāve seen is big gains down low and itās 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 especially from the Boss and CJ intakesā is because the porter take the intake apart, epoxies the inside and smooths everything over. Itās expensive and very time consuming but on cobra jet when done correctly itās 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 wasnāt made very well. Or get an manifold that was made on a good day and gain absolutely nothing, Iāve 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 doesnāt exactly translate well into dyno graphs, it also didnāt help that the 18-21 gen 3 coyotes where kinda underrated, Iām not saying theyāre 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 āgen 4ā car
keep your expectations in spec and youāll be happy