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Chryco's Tech Shop => Engine & Go Fast Goodies => Topic started by: Tmb84 on May 09, 2017 - 10:58:27 am

Title: 383/496 stroker dyno!
Post by: Tmb84 on May 09, 2017 - 10:58:27 am
First round, 577hp 909nm, after some tuning it delivered 616hp 976nm

Im very happy with this
Title: Re: 383/496 stroker dyno!
Post by: 73_Cuda_4_Me on May 09, 2017 - 04:31:00 pm
 :bananasmi

Awesome results!

Now I'm officially jealous... but still happy with my 340 cruiser... Have FUN!!!

 :burnout:
Title: Re: 383/496 stroker dyno!
Post by: cudabob496 on May 09, 2017 - 04:47:45 pm
what are details of engine and components?
Title: Re: 383/496 stroker dyno!
Post by: 73_Cuda_4_Me on May 09, 2017 - 05:21:31 pm
 :clueless:

I am really curious how 'some tuning' nets 40 HP!!! What was involved with that, sheesh! I want that!
Title: Re: 383/496 stroker dyno!
Post by: 73cudabr on May 09, 2017 - 10:31:37 pm
My first trip to the dyno I went from 250 Rear wheel to 270 after tuning and 400 dollars for the tech to change jet sizes and timing. I thought it was a good deal until the timing was so far off it wouldn't run haha. I'm sure results will vary with others.
Title: Re: 383/496 stroker dyno!
Post by: Tmb84 on May 10, 2017 - 02:38:19 am
The carb is a holley dp 950, it had the same injectors front and back, the fuel was way to rich..
He went down on front injectors and up on the rear ones. The timing was also a bit high.

496 stroker kit from 440-source
Upgraded rods
Comp cam 286 roller
Edelbrock alu heads
Edelbrock performer rpm dual plane
Holley 950
MSD pro billett distributor and ignition box
TTi 1,7/8 headers
3" exhaust with open resonators
Electric water pump

2500 stall speed converter

Rwhp did go from 443 to 474

-dynapack dyno
Title: Re: 383/496 stroker dyno!
Post by: 73_Cuda_4_Me on May 10, 2017 - 06:38:30 am
 :2thumbs:
Title: Re: 383/496 stroker dyno!
Post by: Tmb84 on May 10, 2017 - 10:28:10 am
(https://images.finncdn.no/dynamic/1600w/2017/5/vertical-5/10/2/817/214/22_872798445.jpg)

(https://images.finncdn.no/dynamic/1600w/2017/5/vertical-5/10/2/817/214/22_1455301703.jpg)
Title: Re: 383/496 stroker dyno!
Post by: 73cudabr on May 10, 2017 - 02:34:00 pm
Great numbers 700+ tq before 4000 RPMs (assuming the google conversion is correct). Are those heads CNCed?
Title: Re: 383/496 stroker dyno!
Post by: Tmb84 on May 10, 2017 - 03:12:00 pm
no work on heads, not sure of the compression ratio, but it need minimum 98 octane RON gas, i think that is the same as 95 R+M gas
Title: Re: 383/496 stroker dyno!
Post by: todd383 on May 15, 2017 - 09:19:12 pm
Very nice! I also have a 496 383 kit ,  it makes 486 rwhp and 490 rwtq,  it's a blast!  I'm goin on 4 years now and about 20,000 of hard ass miles now, and raced it twice !
Title: Re: 383/496 stroker dyno!
Post by: CUDA8U on May 15, 2017 - 11:08:31 pm
are the heads eddy rpm's?
Title: Re: 383/496 stroker dyno!
Post by: todd383 on May 16, 2017 - 06:40:59 am
are the heads eddy rpm's?
  no, mine are stage 1 ported, and flow around 300, 305 cfm at around 550ish lift,  there 440 sorce aluminum
Title: Re: 383/496 stroker dyno!
Post by: 734406pk on May 16, 2017 - 08:57:23 pm
That's some very strong number! Congrats! :cheers:
Title: Re: 383/496 stroker dyno!
Post by: Tmb84 on May 18, 2017 - 12:52:10 pm
I got 472 rwhp, 140hp lost in the 727!!
Title: Re: 383/496 stroker dyno!
Post by: 73cudabr on May 19, 2017 - 12:01:09 pm
I got 472 rwhp, 140hp lost in the 727!!

I see you have a electric water pump and 3 inch exhaust. Is it a belt fan or electric? 22 percent seems like a lot to lose.
Title: Re: 383/496 stroker dyno!
Post by: 734406pk on May 19, 2017 - 09:21:58 pm
I see you have a electric water pump and 3 inch exhaust. Is it a belt fan or electric? 22 percent seems like a lot to lose.

22% sure seems like a lot to lose, converter slippage? I wonder how a four speed manual compares? Basically when a manual 4 speed is in 4th gear, input shaft and output shaft are connected as one... Same as a TF727 in drive less the hp loss turning the hydraulic pump and converter.  :clueless:
Title: Re: 383/496 stroker dyno!
Post by: xtopfuel on May 20, 2017 - 05:42:21 am
impressive numbers, its hard to pinpoint a percentage number on the HP losses, to many variables
Title: Re: 383/496 stroker dyno!
Post by: Tmb84 on May 22, 2017 - 05:41:12 pm
yes, Electric water pump and Electric fan, the "dynoman" said there was alot of converter slippage.. With manual he think there would be about 50-60 more hp to the Wheels..
Title: Re: 383/496 stroker dyno!
Post by: 734406pk on May 22, 2017 - 09:39:11 pm
yes, Electric water pump and Electric fan, the "dynoman" said there was alot of converter slippage.. With manual he think there would be about 50-60 more hp to the Wheels..

That's what I was thinking, what converter are you running? Nice build BTW!
Title: Re: 383/496 stroker dyno!
Post by: Tmb84 on May 22, 2017 - 10:11:24 pm
thanks, all i know is 2500 stall speed, 10 3/4"  it spin the tires when shifting to 2nd gear at low speed  :cooldancing:

the drivetrain is matching number, if it wasnt i would do a 4spd swap
Title: Re: 383/496 stroker dyno!
Post by: 734406pk on May 22, 2017 - 10:25:21 pm
thanks, all i know is 2500 stall speed, 10 3/4"

the drivetrain is matching number, if it wasnt i would do a 4spd swap

No need for a four speed swap, but i would look into a better torque converter IMO. Many years ago there was a "Shotgun" converter method being used. They would take a stock converter and cut it open and increase the clearance between the turbine and the impeller, increasing the stall speed rpm to whatever you wanted, but the slippage was ridiculous, as expected. All heat and blowby on the top end. Check into it, you never know! :2cents: