How much wheel HP does our Street Hellcat make on our Dyno?

[Unholy707]

But in this case just the headers did add power?

 

[Jack_Toepfer]

But in this case just the headers did add power?

Yes, 40whp on a 930whp car.

 

[Under-Pressure]

What supercharger is on this 426?

 

[Unholy707]

Yes, 40whp on a 930whp car.

Very nice. So it’s safe to assume my ported blower, 108mm throttle body and headers added power

 

[ostmike]

The correct answer is 931 - see the new post I made for more details.

 

[ostmike]

What supercharger is on this 426?

OEM IHI supercharger

 

[ostmike]

Very nice. So it’s safe to assume my ported blower, 108mm throttle body and headers added power

The ported blower will definitely add power.

 

[ostmike]

Maybe I read it wrong but thought this is the tired shortblock dyno before switching to new engine?

That is absolutely correct. That tired factory engine definitely impressed us. Your point is a good one since it would be safe to assume a "fresh" stock engine with the same modifications would produce more power but we cannot prove that.

 

[Jon-MooredPerformanceLLC]

OEM IHI supercharger

Maybe I missed it but what pulley combo are you running ?

 

[ostmike]

Maybe I missed it but what pulley combo are you running ?

10% lower and a 2.85 upper

 

[Unholy707]

Wonder if I can pulley down since I had the snout and bearing plate bearing plate bearing replaced on the 2.4 with “race bearings”. Have a 2.69 upper only, wondering if I can put a 10% lower on

 

[ostmike]

Wonder if I can pulley down since I had the snout and bearing plate bearing plate bearing replaced on the 2.4 with “race bearings”. Have a 2.69 upper only, wondering if I can put a 10% lower on

We have run a 10% lower and 2.65 with race fuel.
Many moons ago we started the smaller pulley journey with a 10% lower
First we ran a 2.85 - good results
Then we ran a 2.75 - better results
Then we ran a 2.65 - best results
Then we ran a 2.50 - good results for a few pulls - then very bad results.........

Now this was on a stock IHI SC about 8 years ago and we have learned much since then but still would not run a 10% lower and 2.5 upper.

 

[Unholy707]

We have run a 10% lower and 2.65 with race fuel.
Many moons ago we started the smaller pulley journey with a 10% lower
First we ran a 2.85 - good results
Then we ran a 2.75 - better results
Then we ran a 2.65 - best results
Then we ran a 2.50 - good results for a few pulls - then very bad results.........

Now this was on a stock IHI SC about 8 years ago and we have learned much since then but still would not run a 10% lower and 2.5 upper.

Very good to know, thanks for sharing. I have a chiller and run e85. Sounds like I might be able to do it (hopefully for more than just a few pulls?)