Dyno results

[Snow man]

I finally got my truck on a dynojet dyno this weekend,I was wondering how mine compares to similarly modifed trucks. I definetely think the dyno doesnt do the ram justice,not enough time to get full load on the engine,especially with 4. 10's,and only letting me run it in direct(drive). I made 2 runs,both within 1hp of the other. 361. 1 @2800 peak,and 725. 9@ 2500 rpm's. The dyno didnt start to read until 2500RPM',tahst why the torque is low. Mods are 4" exhaust,Edge comp,DD3's,rays banjo bolts,DTT 89%,and VB. Id like to get 400hp,without adding any more agressive injectors since I already have a stalling problem now with te DD3's and tight TC.

 

[Floor It]

SnowMan, katdiesel has what you have except he has a piers turbo and he made 447hp and 965 tq, the turbo does make a difference just dont know how much- hope that might help.

 

[KatDiesel]

Dyno Graph



Dyno in Overdrive with the TC locked up. Thats what I did and I got 447hp.



Thats why my graph starts around 2100 and everything is so low. . because we were slowly bring up speed and getting into overdrive... . then ya see lockup (i think its lock up) on a couple of the lines..... then we rolled into the throttle to keep it locked up.



What was your transmission temp during all this? Mine stayed under 160° so I feel there was no slipping going on anywhere to be that cool.

 

[Stefan Kondolay]

Floor it,



Kat also has a high ram and an ATS manifold. And different dyno operators will always come up with different #'s. To do a comparison you need to have the trucks dyno at the same place right after each other with the same operater.



I've seen vehicles often dyno up to 100hp different from place to place. When ever possible try and use a dynojet as I have found that they are more accurate.

 

[Floor It]

True I forgot about those 2 things but my understanding is the banks high ram doesent help on power, anyway thats what mark chapple has said, and from talking to other people that have dynoed the ATS exhaust manifold, it helps EGT's but not power. I'm not positive about it but that is what other people have said.

 

[Mopar-muscle]

snow man , there you go again with the stalling problem ????



i have dd3's and a 93% TC , the only time i had a problem with my truck stalling was when i was missing 3 inches of my intake gasket , the 89% isn't tight enough to cause your stalling problem ...



back to your numbers , you and i have pretty much the same mods , except i used an EZ and a HOT PE instead of the comp , which is good for a few more ponies . your numbers in direct are with the TC unlocked , unless you have a mystery switch . i made 371hp in direct with the 91% TC unlocked . dynoed on another dynojet and got similar numbers in third , but i had a 93% then . after getting the truck into OD and letting the TC lock i hit 409. hp ... what air filter are you using ???

 

[KatDiesel]

All this dynoing madness, will someone comment on your transmission temps during the runs? I made 8 runs on the dyno and I never saw the transmission temp go above 160°, which to me indicates no slippage of anykind happening inside the transmission. This is with the stock transmission pan still. Am I thinking in the right direction? I mean transmission seems to be holding... ... ... . ?????



Mopar-muscle -



The 409 run..... do you have the graph available digitally? I would like to see other graphs to compare to my own. Mine can be seen here.

 

[Mopar-muscle]

kat , wish i could comment with temps , some day i'll finih my gauge install ...



but that sounds correct on your assumption , you're not really loading it and your TC is locked , plus the time involved in pull is not that much ...



i'll have to scan it then find someplace to post it .



dumb question , how did they get a tach reading to give you torque graph ???



we tryed a tool scott has that allows a timing light to be hooked to an injector line , once we got it in a place that gave us a steady reading , it looked good , but it only worked to a certian rpm , couldn't get it to work on a full pull ...

 

[CUMINNTSTRKN]

mm



they put a peice of reflective tape on the balancer and use an optical pickup to record rpm.



jim

 

[Strick-9]

Kat,



I've slipped my transmission more than most so I think I can comment here.



Before upgrading my transmission, I could slip my TC clutch at will. Coming home from vacation with a small 5th wheel in tow, I slipped my TC clutch for miles on end. I could back out of the throttle and watch the tach drop a few hundred RPM then hold. When I stuffed my foot back into it, the tach would raise those 100-200 rpm with no speed increase. This was all done with a mystery switch forcing (or trying to) lockup.



I noticed my transmission temps heating considerably, but this was only after 10-20 minutes of slipping. If I remember correctly, I was backing out of the throttle (reducing slippage) to keep transmission temps at 220° or less. When the TC is locked the transmission temp is more like 140-160°, so there was some definate heat buildup.



I once got stuck on the side of the road and threw it into 4 wheel high instead of 4 wheel low. I stepped on the go pedal and she revved up but the tires never moved. I threw it in 4-low and spun my way out. There was actually white smoke comming from my transmission and the normal horrible burnt clutch smell. I never saw a temp increase during that.



With all of DTT's goodies (including a TC saver), I slipped the front clutch a few times. I have a 1/4 mile near my house and many times (before I got the pressures higher) I would run a quarter, drive straight home for more engine mods, and burnt clutch smell would be radiating from the truck for 5-10 minutes after shutdown. Occasionally, the smell would even enter the cab if I stopped long enough. I never saw a noticable increase in temperatures and could slip the clutch for 1/4 mile at a time.



Even if your transmission is slipping, I doubt you'd see it on the temp gauge if it doesn't occur for several minutes at a time. In case you were wondering, my gauge is in the hot line going to the heat exchanger, not in the pan.



As boost builds in a diesel, the stall speed of the TC increases. That makes it hard to tell by watching the tach whether the transmission is slipping or if the stall is just increasing.



Maybe my experience will help you. If my truck isn't stinking of burnt clutch, I don't worry about it.



-Chris

 

[Snow man]

I still have the stalling problem,im getting it reflashed this week,my truck needs a lot of fine tuning yet. I need the resolve this problem since I will be plowing with this truck,and this requires constant shifting between forward and reverse. I am frustrated with it right now,it seems everything I modify,ends up giving me trouble. The transmission,while stronger than stock,still needs tuning,shift quality,and points are not right,Im working with DTT to correct these,this will eventually be fixed,but it gets aggravating after a while. While testing line pressures on my truck last week,the clutch fan took off,and went thru the radiator. My truck has been down waiting for parts for 6 weeks,of the 11 weeks that I have owned it so far. I had to pull the trans an extra time(my fault). I love this truck,but i need to get some things fixed before it gets real cold out,and the snow flys. On the dyno,my truck ran out of lockup,since i put a TC saver on it. This was neccesary because i can slip my DTT TC at will in 3rd or 4th easily,on anything above level 1 on the Comp box,I didnt think this would be a problem,but it was. I cannot lock the TC and dyno it,I will smoke the TC. If Im cruising down the road at 60,which is 1750RPM's,and roll on the thottle,I can hear the engine rev up,slipping the TC iwhile its still in lockup. I feel the the dyno run should have been done in OD,since this loads the engine better,especially with 4. 10's,My 4" exhaust resonates terrible from 2050 RPM to 2300,I cant stand this,I dont know what the solution here is,but its unbearable on the highway. On a good note,I still had the stongest diesel there,by far that day. I am almost ready to yank everything and put it back to box stock,with an EZ,it was a real nice truck then.

 

[KatDiesel]

Originally posted by Mopar-muscle

dumb question , how did they get a tach reading to give you torque graph ???

As mentioned above, piece of reflective tap on the balancer is what we used.



Tonight at the strip, I got the transmission temp upto 210° while making several repeated passes. And its shifting into overdrive at roughly 3300rpm or so, can that shift point be lowered seperatly or is something else going on? I kept "Smelling" the truck looking for burnt fluid or clutch smell... but all seems fine.



BTW 4 wheel drive launch is awesome!!! I shocked a couple of mustangs tonight .....

 

[Floor It]

And a few buddys too! What a time.

 

[Snow man]

Kat diesel,my truck has a late 3-4 shift too,3400-3500 RPM's. DTT says this is a problem with high powered trucks. If my Comp is off,my truck has a little less power than my dad's truck(DD2's,and EZ),and still shifts at 34-3500,his shifts at 3000. Im trying a new governor soleinoid this weekend. I want to get on the dyno again,this time in OD,and roll on,see what kind of Hp I have then.