Desktop Dyno Help
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Elder User
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From: Redmond, WA
Desktop Dyno Help
I've got a copy of Dyno2000. I'd like to accurately test my combination but I'm not sure as to what numbers for the induction. I've got flow bench numbers for my ported heads, my cam specs, but as to the intake side...I have no clue! 
I'm unclear and unqualified as to place an accurate figure in the Induction entry: What flow rate should I place in that field? 300-1000cfm? I've ran it from 300 up but I would like to keep it accurate.
I am using the stock upper and lower. The lower intake is ported and matched to the heads. The upper is topped off and matched to a twin 61mm BBK throttle body. I also have a real cold air intake that I made with sheet aluminum and a 6" cone style K&N.
As to intake setup: I've heard to use Single Plane manifold, and sequential-fire injection. Which one would be accurate?
Also...what is the stock compression ratio for this motor? I've been running they Dyno at 8.5 to 1 currently.
Any help would be appreciated.
Thanks
Mike
I'm unclear and unqualified as to place an accurate figure in the Induction entry: What flow rate should I place in that field? 300-1000cfm? I've ran it from 300 up but I would like to keep it accurate.
I am using the stock upper and lower. The lower intake is ported and matched to the heads. The upper is topped off and matched to a twin 61mm BBK throttle body. I also have a real cold air intake that I made with sheet aluminum and a 6" cone style K&N.
As to intake setup: I've heard to use Single Plane manifold, and sequential-fire injection. Which one would be accurate?
Also...what is the stock compression ratio for this motor? I've been running they Dyno at 8.5 to 1 currently.
Any help would be appreciated.
Thanks
Mike
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Sequential fire injection more accurately represents long runner EFI style intakes. You shouldn't see any difference in the graphs with induction CFM above 650 or so, and the 5.0 truck intake definitely has that or more. With stock heads the 5.0 was between 8.5-9:1, yours may be different depending upon how much the heads are worked.
Last edited by Conanski; Jul 11, 2007 at 09:42 AM.
Thread Starter
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Elder User
Joined: Oct 2006
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From: Redmond, WA
Originally Posted by Conanski
Sequential fire injection more accurately represents long runner EFI style intakes. You shouldn't see any difference in the graphs with induction CFM above 650 or so, and the 5.0 truck intake definitely has that or more. With stock heads the 5.0 was between 8.5-9:1, yours may be different depending upon how much the heads are worked.
I ran it conservatively at 8.5:1. The work on the heads done, bumped the compression ratio very slightly over stock. My heads were heavily worked over, about as much as those slabs of iron can be worked out. At least in regards to the flow bench numbers over stock E7's. Pistons weren't domed, however. I think 2.02" intake valves required this.
Using an induction cfm of 500 or better, puts the hp at 355 @ 5400 rpm. A little hard to believe, even at the flywheel. Although that heavy truck does get up and go with that puny block.
The area for gear ratios and tire sizes in my copy of DD has been greyed out. I wonder if the bump in gears would shift the curves at all.
If anyone else has a copy of DD- Let me know what you get with my specs:
306 cid (4.032 bore)
Comp Cams 35-308-8
Long Tube Headers with mufflers
4.10 gears on 33" tires (3.75 effective ratio)
500+ cfm induction (according to Paul
)1.94/1.60 valves (ported stock heads)
9:1 compression ratio
Pump gas
Thanks!
Mike
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Elder User
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From: Redmond, WA
There's gotta be someone out there with Desktop Dyno 2000...
Anyone? Buehler??
I'd really appreciate it if someone could run my truck's specs on their simulation of choice.
Thanks!
Mike
Anyone? Buehler??
I'd really appreciate it if someone could run my truck's specs on their simulation of choice.
Thanks!
Mike
Thread Starter
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Elder User
Joined: Oct 2006
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From: Redmond, WA
Originally Posted by Conanski
There's only 1 real way to know for sure... put the truck on a chassis dyno. You know ya wanna...
Most of the speed shops (that I know of) are closed weekends. Thats when I usually head home to Seattle.
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From: Maple Valley, WA
DD is wacked. You wont have 355hp with even the most worked over stock head, unless you have paid every attention to detail, like seat widths, backcuts, chamber deshrouding, etc.
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From: Redmond, WA
Originally Posted by RacinNdrummin
DD is wacked. You wont have 355hp with even the most worked over stock head, unless you have paid every attention to detail, like seat widths, backcuts, chamber deshrouding, etc.
It would be safe to say he knows what he's doing. The flow numbers before and after were quite impressive nonetheless.
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Elder User
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From: Redmond, WA
Originally Posted by RacinNdrummin
what were the flow numbers?
Here's the flow numbers for my ported heads- 28" water not the 25" default in DD. Keep in mind I have a .533 lift cam, no need for .600" lift numbers.
Lift Intake Exhaust
0.100 69.0 65.5
0.200 132.8 127.6
0.300 188.0 158.7
0.400 215.6 158.7
0.450 217.3 158.7
0.500 224.2 158.7
0.550 220.8 158.7
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
From this site.. http://www.50flow.com/stockparts/main.html
The Stock E7 flow numbers are...
Lift Intake Exhaust
0.100 65.6 51.7
0.200 123.5 74.2
0.300 156.0 110.4
0.400 166.3 113.9
0.450 169.8 113.9
0.500 172.5 113.9
0.550 174.6 113.9
The Stock E7 flow numbers are...
Lift Intake Exhaust
0.100 65.6 51.7
0.200 123.5 74.2
0.300 156.0 110.4
0.400 166.3 113.9
0.450 169.8 113.9
0.500 172.5 113.9
0.550 174.6 113.9
Thread Starter
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Elder User
Joined: Oct 2006
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From: Redmond, WA
Originally Posted by RacinNdrummin
Not too bad for E7 castings.
I'm hijacking my own thread...Is that possible?
Back to the issue at hand. Who can run a DD simulation for my specs?
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