What a Max Effort N/A S650 Looks Like

[jboogie1289]

So it’s safe to say that they’re making around 695~ Hp at the crank?? That is very impressive for a N/A build.

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[Junkyard Dog]

So it’s safe to say that they’re making around 695~ Hp at the crank?? That is very impressive for a N/A build.

That would be a 17.12% drivetrain loss, which seems excessively high. 486 horsepower GTs with active exhaust were hitting 420 on the wheel dyno back when new. That is 66 horsepower, divided by 486, is 13.6% drivetrain loss.

Using that drivetrain loss would indicate more around 650 at the crank rather than around 700.

It is, however, a Dynojet.

A Redeye put on a Dynojet and then a Mustang dyno, had 665 rwhp on the Mustang and 717 rwhp on the Dynojet. Same car.




Almost everybody uses Dynojet dynos, though, so for comparison's sake to other cars, this dyno that Steeda used is the appropriate dyno. In addition, those 420 horsepower at the wheels runs from back in 2024 were all on Dynojets, too. Plus, all of Steeda's prior runs in this same car as changes were made were on the same dyno, so the gains are all on the same dyno. So we have the appropriate tool.

Note also that Steeda used SAE numbers (you can see it on the graph), which are typically 2%-4% lower than STD. A lot of folks will throw an STD number up there but do not mention it. No tricks like that for the Steeda naturally aspirated car.

So, yeah, it is probably 650 horsepower, which, when you consider how good the Coyote Gen 4 is from the factory already, is really pretty amazing with no power adder or anything else. That is more than a 160 horsepower increase. Back in the day we thought we had a superpower if we added an NOS 120hp shot. LOL. Steeda has exceeded that increase naturally aspirated.

That engine combo probably drives normally if you just wanted to run to the grocery store, too.

 

[robvas]

So it’s safe to say that they’re making around 695~ Hp at the crank?? That is very impressive for a N/A build.

You'd have to put it on an engine dyno

A gen 3 with headers/cobrajet etc will make 550 on an engine dyno, they are rated at 460hp with the stock manifold/intake, plus you have all the accessories and stuff that don't get put on when on the engine dyno)

cams will generally add about 50hp to that, so 600

 

[jboogie1289]

That would be a 17.12% drivetrain loss, which seems excessively high. 486 horsepower GTs with active exhaust were hitting 420 on the wheel dyno back when new. That is 66 horsepower, divided by 486, is 13.6% drivetrain loss.

Using that drivetrain loss would indicate more around 650 at the crank rather than around 700.

It is, however, a Dynojet.

A Redeye put on a Dynojet and then a Mustang dyno, had 665 rwhp on the Mustang and 717 rwhp on the Dynojet. Same car.




Almost everybody uses Dynojet dynos, though, so for comparison's sake to other cars, this dyno that Steeda used is the appropriate dyno. In addition, those 420 horsepower at the wheels runs from back in 2024 were all on Dynojets, too. Plus, all of Steeda's prior runs in this same car as changes were made were on the same dyno, so the gains are all on the same dyno. So we have the appropriate tool.

Note also that Steeda used SAE numbers (you can see it on the graph), which are typically 2%-4% lower than STD. A lot of folks will throw an STD number up there but do not mention it. No tricks like that for the Steeda naturally aspirated car.

So, yeah, it is probably 650 horsepower, which, when you consider how good the Coyote Gen 4 is from the factory already, is really pretty amazing with no power adder or anything else. That is more than a 160 horsepower increase. Back in the day we thought we had a superpower if we added an NOS 120hp shot. LOL. Steeda has exceeded that increase naturally aspirated.

That engine combo probably drives normally if you just wanted to run to the grocery store, too.

Ok, I was under the impression that the loss from the Drivetrain was around 15-17%. I stand corrected and have learned something today. On average, would you say that the typical loss is more closer to 13-14% for everything?

 

[jboogie1289]

You'd have to put it on an engine dyno

A gen 3 with headers/cobrajet etc will make 550 on an engine dyno, they are rated at 460hp with the stock manifold/intake, plus you have all the accessories and stuff that don't get put on when on the engine dyno)

cams will generally add about 50hp to that, so 600

Point taken on the Dyno and actual numbers to justify the true output to the Rear Wheels. Thank you for that information.

 

[Junkyard Dog]

Ok, I was under the impression that the loss from the Drivetrain was around 15-17%. I stand corrected and have learned something today. On average, would you say that the typical loss is more closer to 13-14% for everything?

Manual transmission is probably less, like 10-12% - I don't know for sure, but manual transmissions do not suck as much horsepower as automatics.

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