Ahh ****.. I dont wanna spin that high anyways.. now you got me worrying again..

 

What?! Yours??

 

oh no madwolf...what did u do to his computer to make it to that?!!? ...lol jk

 

I didn't tune his.

 

i know, it was a joke...so atljar , you ran that 11 sec run on 275 nitto's?

 

I'm really sorry to hear that, man.

 

Well i'll have some dyno #'s eventually on my 1500.00 rebuild w/a 847Cam and Gen VII and stock heads/intake/tb That should be interesting...

 

Sorry to hear about that man. It really bites when stuff breaks. Look at it the way some of do, though...Now you've got a chance to improve upon the beast

Good luck,
Frank
Cahall Performance Transmissions

 

Ouch! Definitely feel for ya. My last round of mods had my car off the road for about a month, and that was during prime summer weather.....I guess we'll be hearing some good things from you in the spring...(383 maybe??).

 

A month..I wish! Mine was down for a solid 3 months this summer, becuase of a few problems. Good luck on the rebuild!

 

How did this swap affect your gas mileage?

 

Eh sorry guys, i was some what vague. My car doesnt have a motor in it right now, being torn down for a 383, preventive maintance i guess you could call it.

The car i originally posted about making the 360 rwhp is the one that bit the dust, mine held good and i will be able to sell it as a longblock. The main bearings and rod bearings looked good in mine. The front cam bearing took a real beating though, it was chewed up. Couldnt see the rest of them.

The 275 nitto question above, best i ever did on them was a 12.50. I ran the 11s on 26x11.5x15 ET streets with 26" prostar skinnies up front. Couldnt ever get the nittos to hook up well enough to launch past 3 or 4k.

 

Oh gas mileage.... I lost about 3 mpg on the highway, and a TON in the city.

 

Very true.

Only time I have seen dyno be close to another dyno is when they are the same brand in the same building with the same cell around them. $53,000 DTS Engine Dynos can be made to be consistant dyno to dyno within less than 1%. That's the kind of stuff Pro Stock Teams and Nextel Cups Guys run. I've seen Superflow Engine Dynos with the same model dyno in a different place be off 9.6% from another identical Superflow, all of them being corrected to the same thing with a Superflow Engineer running the dynos. Not that they are innaccurate it's that the cells that the dynos are in are so different.

That would make a 350rwhp car dyno over 380rwhp at another place if you were off that much.

A chassis inertia style dyno is no way as accurate as a water brake Superflow or DTS dyno in repeatablity.

Only way to compare dyno numbers is on the same dyno, same day, same place.

What we really should look at is what the guy made on the same dyno before he put the cam and valvetrain in and what he made after, that's about the only thing that's going to be somewhat compareable, the % gain that the guy gets.

Either way any cam only LT1 in the 350+rwhp range is working pretty well.

Bret

 

360rwhp with stock heads and the 847 cam is awesome! I am running basically identical custom cam in my setup and Love the way it pulls!
Been turning the stock bottom end 6800-7000. Right now I have a serious lean condition so I am waiting on a walbro pump to take it back to the dyno. I recently put down 386.9rwhp at close to a 14.0 A/F ratio. I think its got 410ish in it once I can get it more fuel!

Way 2 Go guys! Those numbers with stock heads are very impressive!