(10-24-2010, 09:51 PM)Captain America Pete has a Mustang dyno first off, which is better (more accurate/ real world numbers) than a Dyno Jet. ... Oh, and if your worried about not having Dyno Jet numbers for previous comparison, he can convert the real world numbers over to the over inflated Dyno Jet numbers for ya.

(10-30-2010, 11:24 AM)gsxr

(10-24-2010, 09:51 PM)Captain America Pete has a Mustang dyno first off, which is better (more accurate/ real world numbers) than a Dyno Jet. ... Oh, and if your worried about not having Dyno Jet numbers for previous comparison, he can convert the real world numbers over to the over inflated Dyno Jet numbers for ya.

LOL! I've heard exactly the opposite, that DynoJet generally tends to have lower (more realistic) numbers than Mustang. Also remember that there are multiple different types/models of each dyno, i.e. not all Dynojets are the same, nor are all Mustangs the same. If you really want to know how accurate the dyno is, get the exact model from the shop, and do some Googling on that specific model. Even then it's a gray area as the dyno has to be calibrated after installation and if they screw up the calibration, the numbers may not compare well to other dynos, even one of the same mfr / model. In summary, it's best to use the dyno as a tuning tool, and always use the same dyno. It doesn't matter if it reads 100hp or 500hp, after you make a change if it reads 110hp or 550hp, you still got a 10% power increase. The dragstrip is the final equalizer, the dyno numbers are irrelevant if you can't get the power to the ground.

About the 3rd/4th gear thing. Something is screwy there. Justin should definitely have been able to get good runs in 3rd gear with NOS activated. I'm not sure what was going on. There shouldn't have been such a discrepancy between the runs n teh diesel, either. I've done runs in two different gears on my E420 and the difference was 1-3% at most. A 10% delta is huge. Maybe that dyno has lightweight rollers (TOO light weight) and cannot properly load up higher-power cars? It might work fine on low-torque ricers but wouldn't work as well on high-torque diesels or juiced M119's.

BTW, as y'all learned the hard way, the 722.3/722.4 tranny needs both the Bowden cable AND the kickdown solenoid disconnected to keep it in 3rd gear at low RPM's. I unplug the solenoid at home and the Bowden cable at the dyno to keep things simple, while retaining driveability to & from the shop.

If anyone can locate a wire that will work with the dyno's electrical tach input, PLEASE let us know. The optical sensor is a PITA and loses signal about half the time - a real annoyance. I thought it needed a high-voltage signal from a plug wire, but if it will work with a low-voltage signal, we could try the flywheel speed sensor....

(10-30-2010, 08:56 PM)Captain America ALL runs should be done only in the gear that is closest to 1:1 or the dyno will falsely read higher or lower numbers than what the motor actually makes.

(11-02-2010, 11:48 AM)300SD81 What kind of signal does a dyno expect? I can probably put something together to convert the tach amp output to whatever it expects.

(01-11-2011, 12:22 AM)ForcedInduction Any dyno?

(10-25-2010, 03:42 PM)Captain America Ok so I just got done talking with Pete @ WOT. We are go for a dyno day if you guys want to do another. He's got the optical sensor to get the RPM signal. He said that setting up the optical takes a bit of time so sometimes its easeir to set the engine RPM in the dyno computer based on roll speed which he said works out well. It would be $50 a car for 3 runs. He said with his schedualling a sunday would work out better (didn't think that would be an issue ). Also said that the gas Benz's with traction control can be tricky because the computer trips out when the front wheels are not turning, I dunno if this is a known problem or not... anyway, if we wanna come up with a date we are good to go. I would definitely be there with my POS so that would count as one.

(02-11-2011, 04:41 AM)400Eric Totally off topic but this isn't worth starting a new thread over: Whoever that was at the 60/215/91 interchange tonight (I hope that wasn't you Captain), you didn't need to turn our little brawl into a full fledged road rage incident. My 400E is a 93, the last year without a cabin filter. I was just simply trying to get around you so I could prevent subjecting my wife and 2 kids to your prodigious diesel fumes. I also had a new air compressor in the trunk along with three tires with rims, and loads of groceries and other stuff. The car was packed solid but we still spanked you anyways. That area is heavily patroled by the revenuers (ask me how I know), so in the future, chill. If I didn't have the wife and kids with me I maybe wouldn't have minded, but you took it too far. No hard feelings, but please try to chill a bit. Getting laid might do you some good. Try it.
Regards, Eric

(02-11-2011, 04:41 AM)400Eric

(10-25-2010, 03:42 PM)Captain America Ok so I just got done talking with Pete @ WOT. We are go for a dyno day if you guys want to do another. He's got the optical sensor to get the RPM signal. He said that setting up the optical takes a bit of time so sometimes its easeir to set the engine RPM in the dyno computer based on roll speed which he said works out well. It would be $50 a car for 3 runs. He said with his schedualling a sunday would work out better (didn't think that would be an issue ). Also said that the gas Benz's with traction control can be tricky because the computer trips out when the front wheels are not turning, I dunno if this is a known problem or not... anyway, if we wanna come up with a date we are good to go. I would definitely be there with my POS so that would count as one.

Where are we with this? Let's do another dyno day at your buddy's shop! I have a new ignition controller I want to test thanks to GSXR, and you guys need to try this guy's Mustang dyno because of what I just read in Hot Rod: "Types of chassis dynos
Dynos can be categorized as either inertia, hydraulic, or electric. An inertia dyno can only do full-throttle acceleration runs, but the best load-bearing hydraulic and electric dynos can do step tests, constant-speed pulls, and even part-throttle testing so that full road-load simulations can be conducted right on the dyno."

"Inertia Dyno: These extrapolate rear-wheel power output by analyzing the dyno drum's acceleration rate using a sophisticated accelerometer and computer software. A vehicle is placed on the dyno with its drive wheels sitting on heavy roller drums of known mass. The car is placed in gear and accelerated at wide-open throttle. It takes a certain amount of time and force for the tires to accelerate the rollers. The acceleration rate is directly proportional to how much power the tires place on the heavy roller to get it to rotate. Inertia dynos have the reputation for reading "high." Generally, with mainstream vehicles in the 3,500-pound class, they'll yield consistent results with minimal setup time. They may have trouble obtaining accurate results with extremely heavy or light vehicles. Turbocharged engines won't build boost as they do in the real world. Dynojet is the most common pure-inertia dyno (some of its newest models have an eddy-current option)." (The whole article is here: http://www.hotrod.com/techarticles/general/hrdp_1103_chassis_dyno_testing/index.html

What this means is that all of you with turbos may not have gotten accurate info at our last dyno day cause that place only has a regular Dynojet. We need to go have a dyno day at Captain's buddy's place cause he has a Mustang dyno!

Totally off topic but this isn't worth starting a new thread over: Whoever that was at the 60/215/91 interchange tonight (I hope that wasn't you Captain), you didn't need to turn our little brawl into a full fledged road rage incident. My 400E is a 93, the last year without a cabin filter. I was just simply trying to get around you so I could prevent subjecting my wife and 2 kids to your prodigious diesel fumes. I also had a new air compressor in the trunk along with three tires with rims, and loads of groceries and other stuff. The car was packed solid but we still spanked you anyways. That area is heavily patroled by the revenuers (ask me how I know), so in the future, chill. If I didn't have the wife and kids with me I maybe wouldn't have minded, but you took it too far. No hard feelings, but please try to chill a bit. Getting laid might do you some good. Try it.
Regards, Eric

(01-21-2011, 07:16 PM)300SD_KY note the side exhuast ... hint ... hint ... possible to have this coming out the passenger or driver side?

(02-28-2011, 11:38 AM)winmutt Hes pretty busy with personal stuff these days. As soon as the days start getting longer we all get more productive.

(03-16-2011, 07:11 AM)Rudolf_Diesel No updates...I am considering parting out the car as I really dont have time for it anymore - any interest?

(03-16-2011, 12:38 PM)mike-81-240d

(03-16-2011, 07:11 AM)Rudolf_Diesel No updates...I am considering parting out the car as I really dont have time for it anymore - any interest?

What?!!!!!

Did something break?...

(03-16-2011, 01:44 PM)Rudolf_Diesel

(03-16-2011, 12:38 PM)mike-81-240d

(03-16-2011, 07:11 AM)Rudolf_Diesel No updates...I am considering parting out the car as I really dont have time for it anymore - any interest?

What?!!!!!

Did something break?...

Nothing broken, head gasket is probably an issue. It is more of the pursuit than the actual catch if you know what I mean? It was a blast building, and I am still on the fence, but I may want a new project.

(03-16-2011, 01:44 PM)Rudolf_Diesel Nothing broken, head gasket is probably an issue. It is more of the pursuit than the actual catch if you know what I mean?