Dyno 2000 HP #s
Thread Starter
Melting Slicks
Joined: Dec 2000
Posts: 2,130
Likes: 1
From: mesa,az
Dyno 2000 HP #s
So i bought a copy of DYNO2000 off Ebay for $10, WTH. plugged in the numbers for my engine build i am working on and to say the least my results seem, ummm, optomistic . to put it bluntly. i don't belive the damn thing. has anyone used this software and followed it up on a real dyno?
thanks
greg
PS it is saying 415 HP at 6500 RPM.
thanks
greg
PS it is saying 415 HP at 6500 RPM.
Last edited by panchop; Aug 9, 2004 at 09:32 PM.
Safety Car
Joined: Feb 1999
Posts: 3,631
Likes: 14
From: Fountain Hills AZ
I've only seen a few DD vs actual dyno comparisons but, though a little optimistic, the program came pretty close to the actual numbers. Keep in mind that DD is giving a gross hp estimate so don't expect to clobber any Z06's 
. As I recall from previous posts, you are using the RPM heads and cam. Edelbrock advertises something like 420 hp (or is it 430?) for their package in a 350 so your 415 seems reasonable to me. My combination, except for a little smaller cam (230/236), is similar to yours (331ci and Edelbrock RPM heads) and DD shows 400hp @ 6000.
. As I recall from previous posts, you are using the RPM heads and cam. Edelbrock advertises something like 420 hp (or is it 430?) for their package in a 350 so your 415 seems reasonable to me. My combination, except for a little smaller cam (230/236), is similar to yours (331ci and Edelbrock RPM heads) and DD shows 400hp @ 6000.
Race Director
Joined: May 2000
Posts: 12,712
Likes: 2,270
Simulation programs are useful primarily for COMPARISONS. You start out with a baseline - such as the OE engine, then start making improvements like better heads, more cam, etc, and you should concentrate on achieving a usable 80 percent torque bandwidth for your application, NOT peak power.
Don't take the predicted numbers as absolute predictions, but you can rely on the percent improvements from your baseline.
Since DD2000 and its relatives only predict SAE gross HP on a lab dyno you can fall into some traps. For example, a big cam with lots of overlap and headers may make big numbers on a lab dyno, but when you install it in a car with an exhaust system and mufflers, the backpressure will just KILL the torque curve across the range, and you could end up with a stone.
Engine Analyser allows you to simulate SAE gross or SAE net with an exhaust system and front end accessories. SAE net is the way to go because you are simulating the engine output as actually installed in the vehicle. Of course, you have to model the various engine components accurately, but this comes with experience once you have some lab and rear wheel dyno data you can refine your models and achieve very good predictions.
EA also has some good diagnostic tools - like inlet and exhaust average velocities, Mach index, effective overlap in sq-in-deg, and detonation prediction. Though many may not be familiar with some of the concepts presented, it will be an education and you'll understand engines a lot better.
Duke
Don't take the predicted numbers as absolute predictions, but you can rely on the percent improvements from your baseline.
Since DD2000 and its relatives only predict SAE gross HP on a lab dyno you can fall into some traps. For example, a big cam with lots of overlap and headers may make big numbers on a lab dyno, but when you install it in a car with an exhaust system and mufflers, the backpressure will just KILL the torque curve across the range, and you could end up with a stone.
Engine Analyser allows you to simulate SAE gross or SAE net with an exhaust system and front end accessories. SAE net is the way to go because you are simulating the engine output as actually installed in the vehicle. Of course, you have to model the various engine components accurately, but this comes with experience once you have some lab and rear wheel dyno data you can refine your models and achieve very good predictions.
EA also has some good diagnostic tools - like inlet and exhaust average velocities, Mach index, effective overlap in sq-in-deg, and detonation prediction. Though many may not be familiar with some of the concepts presented, it will be an education and you'll understand engines a lot better.
Duke
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
WHen I use DD I use the stepped race header no mufflers option, I think this is the only way to get an accurate simulation. THis will give you gross HP or what the engine will make under optimal condtions on an engine dyno.
THe numbers look optomistic because you have to subtract quite a bit, up to 40% to get RWHP. You need to subtract power steering, water pump, alternator, exhaust etc. on top of 18-20% for drivetrain loss.
My L48 came out to about 440HP on DD and I got ~300RWHP a quick calculation tells me that is about a 32% loss which makes sense to me. You can get flywheel HP somwhere around 380HP from that.
THe numbers look optomistic because you have to subtract quite a bit, up to 40% to get RWHP. You need to subtract power steering, water pump, alternator, exhaust etc. on top of 18-20% for drivetrain loss.
My L48 came out to about 440HP on DD and I got ~300RWHP a quick calculation tells me that is about a 32% loss which makes sense to me. You can get flywheel HP somwhere around 380HP from that.
