I think a better comparison is a 2.3 FP Red to lay over leetevo's current chart but I've look at that already and his chart beats the Red. That makes it hard for me to swallow the spool up on he EFR.

Since he is willing to go to the Dynojet I think the best thing to do is wait until next week and none of us have to guess.

 

ah no, I meant compare his 2.0L stock block Red versus some MD dyno results of a 2.0L Red you have. That is in the same power range ~ 450MD Hp.

I agree that wouldn't be a very good comparison lol.

 

Can dynapaks simulate "real world" load conditions yet? With the ability to control load based on hub speed, you could easily have a load profile that simulated vehicle inertia and aero loading. Same thing the mustang dynos do.

I have never cared for the set RPM ramp rate method used on the dynapaks. I love that they eliminate the tire interface though.

 

I found a dyno that was available to do it. I'm scheudled for Thursday.

http://www.fsrmotorsports.com/

Typically I'd use Tunning Techs but they are booked solid. I honestly have no familiary with this place other then they apperently have an AWD DynoJet.

 

Thank you leetevo, please be sure to let me know the cost and I will send the money over to you......and some t-shirts

 

I just watched my video of my 2.3/black dyno pull and it took less than 8 seconds for the pull in third gear. This is at 605whp.

http://www.youtube.com/watch?v=bIuvJ...e_gdata_player

 

Not trying to stir anything, just adding some semi-relevant data.

 

I'd say more like 6-7 seconds.

 

It's good 7 seconds. what was your start RPM? was it from 2.5k to 8k?? certainly didn't sound like it.

 

I am pretty sure thats what it is, thats what I normally do. Track down his dyno sheet and it should show. I will see if I can get DJ to send me the DRF of it monday.

Aaron

 

No need. It is 2500-8000, Eric.

 

Still a long way from 11 seconds and the black is laggy.

 

FWIW, you should realize that on the dynojet pull above, it sounds like it takes about 4 seconds from the time of throttle application to full boost. Based on the dyno chart, that is 2500 to 4500 RPM in 4 seconds...or 500 RPM per second.

Exactly the same thing you would get running a dynapak from 2500 to 8000 RPM with an 11 second ramp time.

You have to realize the dynapak doesn't give a crap how much power you put to the hub, it's going to try and limit the change in hub speed to the specified ramp time. Where a dynojet is simply an inertial load, the harder to push it, the faster it accelerates. It is taking 4 seconds to go 2000 RPM during spool up, and then about 3 seconds to go the other 3500 RPM as the roller is being accelerated more quickly. Sure, it's a 7 second pull. 4 seconds of it were still spent in the spool region, just like on the dynapak. Only difference is the dynapak was able to put more load on it after boost hit and made the entire full boost section of the run last longer.

It will be interesting to see the dynojet chart. I don't think it's going to be nearly as significant as some of you guys are thinking based on the 11 second pull. I have tuned a car on a dynapak and we used a 12 second ramp time. With an SC61 on a 2.0L, the boost plot from the dynapak was almost a perfect match with a 3rd gear street pull. The car was ~2600 pounds too, so it was light on load on the street which should have meant the dynapak would have shown it as even more responsive. The car was also tossed on a dynojet a few years later and it showed nearly identical response to what the dynapak showed.

 

I believe you are incorrect. A dynojet starts when you hitthe green button on the controller. The dynapak starts when you tell it to, just like MD. So the dynapak is applying the load from 2500-8000 and holds just rpm range to the eleven second pull.

 

Huh? I know how a dynojet works, as well as a dynapak and a mustang. I've tuned on all 3 of them.

I was just talking about the video above, I assumed he started the pull on the dynojet (push the button) while he was stablizing the engine speed, then floored it. You can hear him floor it at 21 seconds. I assumed this was ~2500 RPM. From there, the turbo sounds like it hits full boost between 24 and 25 second mark. 3.5-4 seconds. Based on the dyno chart, this corresponds to ~4500 RPM. So the car accelerated from ~2500 RPM to 4500 RPM in 3.5-4 seconds, which is approximately 500 RPM per second. Correct?

Ok, the dynapak in comparison, it was set up for an 11 second ramp time from 2500 RPM to 8000 RPM, which equates to 500 rpm per second. Thus, from 2500 RPM to 4500 RPM, the dynojet and the dynapak take roughly the same amount of time, thus the load is fairly similar during this time period.

After this period, yes, I will agree the dynapak is slowing acceleration by a considerable amount and would probably be similar to a 4th gear pull ONCE FULL BOOST HAS BEEN REACHED. Until full boost has been reached though, I would bet the load is similar between the 3rd gear dynojet and the 11 second ramp time on the dynapak.

Make sense? Or do you still disagree with this opinion?