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  #1  
Old 07-13-2007, 01:52 PM
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Chassis Dyno Results, Pics, and Vid

Today was a blast.

I met a great bunch of guys at Paul's High Performance.

Here are some of Paul's suggestions.

1. Need to work on the timing
2. Hotter coil then a stock TFI coil (was cutting out in high R.P.M.S)
3. She needs to be leaned out

They welded in a bung for the O2 sensor. Then got right to work on the Dyno.













This is best of the pulls comparison. Blue is with the exhaust cutout closed. Red with it opened. Good for an extra 15 H.P. and 10 more Torque.




I had to stay in a little viewing room as he did the pulls....So the Video ain't that great. But you get the idea.

http://www.youtube.com/watch?v=lvD76GCuw1M

He guesstimated a 25% loss to the rear wheels.
So he figures the engine in at around 336 HP and 475 Tq.

I'll fix a few things and go agin in the fall.

Larry Miller
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Old 07-13-2007, 02:01 PM
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What Cam did you pick with that? those are very repectable numbers for rear wheel figures.
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Old 07-13-2007, 02:09 PM
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I noticed that below about 2750 RPM you actually lost HP & torque!!!

How often do you drive & wheel with the motor turning in the 4-5K RPM range?

I would think that unless you drag race the motor you don't gain but loose low end performance where these vehicles were designed to run. JMHO.
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Old 07-13-2007, 02:10 PM
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It's an Edelbrock Performer Plus.

It did better then some of the guys there thought it would.

I had a big grin on my face when he showed me the numbers.

Money well spent.

Mostly climb dunes with it when it come to off road and it's in that range.
I hit that daily driving too.

Larry
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88GW "Mississippi" 401,Edelbrock heads,and stuff,
4" Skyjacker, BFG AT's,OBA,Air Horn.

'89GW "Mutt" wood for now, 360, 1405, Edelbrock cam,
4"Rusty's,3"body,33"BFG. Detroit Truetrack Warn Hubs

The Metal Workshop
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Last edited by Millerluck : 07-13-2007 at 02:14 PM.
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  #5  
Old 07-13-2007, 02:31 PM
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Quote:
Originally Posted by Millerluck
I hit that daily driving too.

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Old 07-13-2007, 04:07 PM
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I'd bet not too many here can match those numbers, that is WAY COOL
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  #7  
Old 07-13-2007, 07:37 PM
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25% of 336HP is 84HP...so...336 + 84 = 420HP!
WOW!

Very Kewl!!
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Old 07-13-2007, 08:00 PM
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Next time run stock size tires and you will improve your numbers too
Last time i did a dyno run like that we try the 33's and than 235's and it improved by almost 20%.
But those are good numbers anyway
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  #9  
Old 07-13-2007, 08:22 PM
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Bryan 336 is the engine guesstament, it had 252.2 HP at the rear wheels.

252 / .75= 336

Larry
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88GW "Mississippi" 401,Edelbrock heads,and stuff,
4" Skyjacker, BFG AT's,OBA,Air Horn.

'89GW "Mutt" wood for now, 360, 1405, Edelbrock cam,
4"Rusty's,3"body,33"BFG. Detroit Truetrack Warn Hubs

The Metal Workshop
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Last edited by Millerluck : 07-13-2007 at 08:25 PM.
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  #10  
Old 07-13-2007, 08:30 PM
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Way to go!
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Old 07-13-2007, 10:28 PM
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  #12  
Old 07-13-2007, 11:22 PM
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In order to get a corect amount of loss for the drive train did he take gearing and tire sizeinto account? I know you are running larger than stock tires (33's?) with as I recall, stock 3.31 gearing. Thats pretty bad for power to the ground. Unless his dyno takes that all into effect. 20-25% loss is pretty standard for a heavy duty automatic trans like a TF727 or TH400.

Pretty good numbers none the less. There are lots of other TFI coils out there that you can easily slap on.
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  #13  
Old 07-13-2007, 11:59 PM
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That's awesome. I wonder how much your apparent low end HP difference with the cut-outs engaged has to do with the fact the pull started 1000 RPM's later. The engine is going to start building power when WOT starts and it isn't going to care that it's 1k RPM different than last time it's going to build power pretty much the same way it does 1k rpm earlier. IOW the power curve isn't going to instantly catch up just because your 1k further into the RPM band.

I'd venture to guess your loosing less lowend HP with the cut outs open than the chart appears to show.


I still have some 'break-in' miles and some issues to fix before I do anything like a dyno.
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  #14  
Old 07-14-2007, 01:22 AM
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stock figures for a 401 are what, 235 HP and 325 Tq?

336 HP and 475 Tq... those are great numbers, but not nearly as impressive as I was expecting out of your motor
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  #15  
Old 07-14-2007, 06:02 AM
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I asked about the gearing and tires too. He said he felt 25% was about right and left it at that.

Way long time ago, the tech at Edelbrock said he thought it would make between 330 and 350. So I don't feel to bad.

I'll get a hotter coil (Had an MSD Blaster until the tower just popped off of it ), get the timing set better, and get a mixture ratio gauge and tune in the carb.

Then I'll hit it again and see how it does.

Larry
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88GW "Mississippi" 401,Edelbrock heads,and stuff,
4" Skyjacker, BFG AT's,OBA,Air Horn.

'89GW "Mutt" wood for now, 360, 1405, Edelbrock cam,
4"Rusty's,3"body,33"BFG. Detroit Truetrack Warn Hubs

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Old 07-14-2007, 06:05 AM
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Curious the octane and compression you are running?
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  #17  
Old 07-14-2007, 08:34 AM
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Quote:
Originally Posted by 75J20
I noticed that below about 2750 RPM you actually lost HP & torque!!!

How often do you drive & wheel with the motor turning in the 4-5K RPM range?

I would think that unless you drag race the motor you don't gain but loose low end performance where these vehicles were designed to run. JMHO.

The reason for this is that they do the runs in third gear. They have to be going fast enough to keep it from kicking down to second. I'm betting that if you put that on an engine dyno it would have some killer low end too. Wheel dynos are pretty much useless for measuring low end. Great numbers Larry!

Btw, I saw that you are in the process of repainting it. What color are you going for?
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  #18  
Old 07-14-2007, 08:53 AM
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Elliott

89*....I wanted to do the test on what use daily.

Static should be about 9.5/1.

Ghinmi

Sticking with black paint.

He showed me that I need to limit the vac advance more then the adjustment of the diaphragm aloud....So I'm making a mechanical stop for it today. My total with everything hooked up and it at 3000 RPM's in neutral was 55* with manifold vac....and 54* with ported.
The initial is at 11* and the total with the vac unhooked was 37*

He said it's a good thing it has been running rich or it would be pinging bad.

The stop I'm making is slotted so I'll be able to adjust how much it can move from none to full.

Larry
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88GW "Mississippi" 401,Edelbrock heads,and stuff,
4" Skyjacker, BFG AT's,OBA,Air Horn.

'89GW "Mutt" wood for now, 360, 1405, Edelbrock cam,
4"Rusty's,3"body,33"BFG. Detroit Truetrack Warn Hubs

The Metal Workshop
http://www.themetalworkshop.com/index.html
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  #19  
Old 07-14-2007, 04:20 PM
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What are the specs on the 401?
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  #20  
Old 07-14-2007, 06:25 PM
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rockjeep44

Here's the list.

http://mysite.verizon.net/lsjlmiller/401build.htm

Here's a pic of the vac advance limiter I made.

Sorry it's blurry.



Works great.


Larry
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88GW "Mississippi" 401,Edelbrock heads,and stuff,
4" Skyjacker, BFG AT's,OBA,Air Horn.

'89GW "Mutt" wood for now, 360, 1405, Edelbrock cam,
4"Rusty's,3"body,33"BFG. Detroit Truetrack Warn Hubs

The Metal Workshop
http://www.themetalworkshop.com/index.html
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