224hp and 247ft/lbs of torque

'91 305 HSR + lt1 cam. Everything else is completely stock. The log manifolds and stock program included. If you look at the AFR graph at the bottom you can see that with stock tune it gets pig rich from 2500 up until 4500. Just poping this up here to help anyone. It's definately an overkill manifold for the 305 but does provide a very broad flat torque curve.

Opinions? Thoughts? Anyone else dyno'd their HSR 305? With tuning and full exhaust I'm sure you could squeek out quite a bit more.

 

I'm impressed with how flat the torque curve is with the shorter style runners in an HSR, not to mention it's a good bit higher than where a cam/intake 305 should be.

 

I was suprised as well. I've always heard the "you'll lose the power down low" but it seems pretty flat to me. I kind of wish I saw what it was before the HSR.

 

Throw some headers on there and it'll lean out a bit. Tune it and things will get a lot better. That combo has a lot to gain from a tune and full exhaust.

Also, short runners have been known for a long time now to produce a flat torque curve (a la LT1 and Miniram). Longer runners will typically produce more torque, but with a fairly steep curve (like stock TPI).

 

I'm surprised that the peak HP did not carry up higher in the rpm range. It appears to me that peak power comes in at approximately the same rpm as a TPI.

 

It might with headers and a decent tune. Who knows. Even after those two things I doubt I'll be rapping it out that far though. It's still the stock bottom end and I barely trust it at 5.5k let alone any higher.

 

thats pretty cool

 

That's pretty impressive.

Clean up your fuel issues and you'll see more power.

If I ever do another EFI build up it'll be with a HSR.

 

Not enough cam head or exhaust .. that would wake her up

 

So, why is it running so rich?

With the stock programming coupled with the HSR, it should be running lean.

There most be other mods.

 

Othat than that, nothing. Stock style bin with EGR removed.

 

What about the injectors? Are the stock 19#/hr injectors still in the fuel rails?

 

Yup. Well they're whatever came stock with the car. And the car was absolutely bone stock down to stock style ac delco plugs when I bought it. The previous owner didn't know anything about the car.

 

Its rich from 2500-4500 because thats where the tpi's charging effect lies.

 

Are you talking about the "tuned" portion of tuned prt injection? Does it really make that much of a difference? Or is that just richening in the stock chip?

Interesting....

 

Well, it is just richening in the stock chip and yes, it is there to go along with the added air that the tpi provides in its tuned range.