Dyno results and Performance question

[CTDFreak]

Pretty new to this site as far as posting goes, though I've done a lot of searches and learning here. This is my first diesel, and this site has been extremely helpful. Now for the question...



I just got my truck dyno'd last Saturday with my Edge Juice installed. My best pulls were 346HP and 680TQ which were ok. Not quite as good as I was hoping, but not bad.



The problem is that my truck fell flat on its face once I hit 2700 rpm, which I think says that my torque converter is slipping and not holding up well. Ken Imler (at Imler Diesel performance where the dyno day was) said that a new torque converter and valve body would do the trick. Any recommendations on a torque converter brand? I don't plan on doing many more mods (at least for now), and I want reliability and driveability over flat out performance. I'm pretty happy with the Edge Juice (w/ Attitude), aFe Stage II Proguard, and Magnaflow Muffler. Anything else I should do (besides the TC)?

Thanks.

 

[bchesley]

My favorite is DTT, however I placed a heavy emphasis on this purchase with them because of my local installer. I talked with him and got that warm fuzzy fealing that he would be there if I had problems. So far nothing but smiles! My suggestion would be to shop Installers as much as the product itself. No one makes a perfect product! If you do have any problems make sure you are going to get good service!!!!!!!



Brad

 

[CTDFreak]

Can any COMPETENT mechanic do the install? Or is it more specialized than that? And what could I expect to pay for the install?

 

[KLockliear]

Well, a few questions come to mind:



1. What brand of dyno was used?

2. Did you dyno the truck in the "0" setting as well as "5" to see the difference from stock?

3. I doubt the truck falling on it's face is because of the TC. If the TC clutch let go, the truck would rev up. What gear was the run done in and was the TC clutch locked up (1:1 ratio between engine RPM and speed increase)?

 

[CTDFreak]

Well, a few questions come to mind:



1. What brand of dyno was used?

2. Did you dyno the truck in the "0" setting as well as "5" to see the difference from stock?

3. I doubt the truck falling on it's face is because of the TC. If the TC clutch let go, the truck would rev up. What gear was the run done in and was the TC clutch locked up (1:1 ratio between engine RPM and speed increase)?

1. It was a Mustang Dynamometer

2. I had 3 dyno runs, plus a 1/4 mile dyno run. Here are the results

run 1 (Edge on 0) 248HP/465TQ

run 2 (Edge on 3) 277HP/628TQ

run 3 (Edge on 5) 346HP/680TQ

run 4 (Edge on 5) 15. 84 1/4 mile @ 83. 6 mph

3. I believe the dyno was run in 3rd gear (not sure, as I wasn't in the drivers seat, but that is what they said they were going to do).



The problem is my torque curve is fairly flat from 1900 rpm to 2700, then drops sharply down through 3400 rpm. And my numbers were dramatically different in the MPH vs RPM charts, which the guy running the dyno day says points to the TC being the weak link.

Does that sound right?

 

[Dual EE]

How did your truck run on the 1/4 mile track compared to the dyno 1/4 mile?



Were the et's and speed the same as the time slips?

 

[CTDFreak]

My best run at the track was a 15. 797 @ 83. 097mph (in 4wd so I could launch). Pretty darn close to the 15. 842 @ 83. 591 mph on the dyno, huh? I was surprised that the results were so close.

 

[Dual EE]

I would not have thought that a simulated run would actually be that close.

 

[Bob4x4]

My truck is very similiarto yours,4. 10,35's. I ran a 15. 4 @ 84mph at palmdale where the times and mph's are never impressive. With the stock trans the best runs were in level 3. The stock trans does not like to shift into o/d under full load very quickly. I haven't dynoed yet,I'll wait till I get a few more miles on it,and probably do the DTT treatment



Bob

 

[KLockliear]

Sounds about right. I'd have to see these dyno graphs to visualize what you are talking about. We typically run the Dodge's locked up in 4th gear, so it won't down shift or unlock. 3rd gear won't show as much HP since the run happens so fast typically, but maybe not an issue with a load dyno. I'd bet the TCC did unlock in 3rd gear, where it wouldn't do so in 4th.

 

[Giachino]

Aren't the baseline numbers a little low for a stock 05/610? 248HP/465TQ? I thought they're supposed to be around 270/500 stock at the rear wheels?

 

[CTDFreak]

that's what I though also. I know the 35's dropped my numbers by about 20HP/40TQ (again according to Ken Imler who owns the shop), and any other drop off was from the TC (I think).

BTW... I have 3. 73's.

 

[JCleary]

With my 305/555, 3. 73's, and Toyo 35's in direct I dynoed on a Mustang @ 247/477 with a Banks 4" exhaust and no other mods. 100 hp Quad box gave me 339/685.



Something's gotta be slipping, you should be doing better than I did.

 

[OT-OF-HERE!!]

dynoing

My truck is very similiarto yours,4. 10,35's. I ran a 15. 4 @ 84mph at palmdale where the times and mph's are never impressive. With the stock trans the best runs were in level 3. The stock trans does not like to shift into o/d under full load very quickly. I haven't dynoed yet,I'll wait till I get a few more miles on it,and probably do the DTT treatment



Bob

When they ran mine they brought it up rather slowly (not hammered) until the truck shifted into od and then they hammered it. I think your results are scewed. Without having a built transmission your no doubt experiencing a delay when going from 3rd to od,. . seems like a long second with your foot on the floor,... right? It's messing you up from seeing what your truck will really do. Try it like they did on mine and you'll have a lot better result I believe. You should be hitting around 380hp to 400hp with the Juice on lvl 5.

 

[CTDFreak]

With my 305/555, 3. 73's, and Toyo 35's in direct I dynoed on a Mustang @ 247/477 with a Banks 4" exhaust and no other mods. 100 hp Quad box gave me 339/685.



Something's gotta be slipping, you should be doing better than I did.

I agree. That's why I started this post. Has anyone changed their TC to realize a significant difference, or do you think something else is going on? BTW, I've run my Edge above 3 (on 4 or 5) a total of maybe 10 times. 8 of those were on the day I dyno'd and raced it at the track. SOOO... when I dyno'd, it was only the 3rd time I had ever gone on setting 5, so I'm relatively sure that my transmission is not messed up yet, but I think the TC is not able to handle all of the extra torque.



My Attitude monitor reads 4. 5% to 4. 9% transmission slip occassionally when I'm on the go pedal, once I get into overdrive (not in 1 - 3 gear though).

 

[CTDFreak]

Hopefully this works. Here are the dyno sheets. Stock. Edge 3. Edge 5. Edge 5. You can see the drop off after 2700 rpm.

 

[cerberusiam]

The 610's will generally put down 270/520 uncorrected on a DynoJet. Mine will do 300/550 corrected on a DynoJet stock. Your numbers are a little low but thats from a Mustang so not sure how much difference there will be. If the run wasn't done in OD then its a good bet thats why they are low. With the 05's you can't just hammer the throttle and keep the TC locked. You need to roll into the throttle and that will bring the torque down. I don't have my sheets handy but I would guess that sharp drop is the TC unlocking. thats sounds about right for a 3rd gear run with too much throttle.



How much difference a TC will make without a program change to the ECM or a controller is a good guess. It has to make some but if the TC is unlocking you are still loosing HP and TQ readings.

 

[CTDFreak]

So what can I do the keep the TC from unlocking?

 

[CTDFreak]

anyone else?

 

[KLockliear]

If you dyno in OD (4th gear), you can find the RPM to start the run where it will not downshift or come out of lockup. Typically somewhere around 1900rpm or so.