A couple of weeks ago at the truck pull in Liberty, GA I put my truck on the Dunbar's dyno. I was very disappointed to see the truck only make 373. It has studs, 4" straight pipe, extreme race tune from Eric at Innovative, S and B intake and intake elbow, and has 35" tires on it. I was told by almost everyone that I should be around 420 or so. I could a 10 to 15 horsepower difference, but I can't see a 50 horsepower difference. Just trying to figure out if those numbers are accurate or if this tune doesn't give the truck as much as it says it does.
I did 238 BONE STOCK, and then 368 (I think) with an xtreme race tune and exhaust, my fuel pressure goes off a cliff after 3/4 throttle though, and I can't even break 1150 EGT's going down the track
that's a normal number. Have the truck weighed, go to the track, and run the 1/4 mile and see what the calculator tells you your HP is, trap speeds,ET's and weight slips don't lie.
Have the truck weighed, go to the track, and run the 1/4 mile and see what the calculator tells you your HP is, trap speeds,ET's and weight slips don't lie.
I think the 35" tires are kill'n yea.
Stock tires are something like 32"
The tires are prolly pulling you down big time...and if you don't have the pressure/volume of fuel, you will loose out on power as well.
Yes, it's all relative. If you dyno stock at the normal ~260rwhp, you will see over 400rwhp with our Xtreme. If you are only dynoing 230rwhp stock, the numbers will be 30rwhp lower tuned. A lot has to do with the dyno itself, converter lockup, starting RPM(unless it's a specific dyno file), and environmental conditions.
Eric, can you give us some info on the dyno file? I'm going to another dyno event again this year that our local club is holding and I had a heck of time getting the truck to NOT downshift on the dyno even with a relatively small load.
I did 238 BONE STOCK, and then 368 (I think) with an xtreme race tune and exhaust, my fuel pressure goes off a cliff after 3/4 throttle though, and I can't even break 1150 EGT's going down the track
That sounds like a major fuel drop off! I can max my 1600 gauge on my 06 with intake/exhaust and just Erics x-street or x-race
Just for reference, even though I dont trust or believe any of these numbers... My truck did
270rwhp stock (didn't get a torque reading...) and then with just an X-race tune with stock intake and stock exhaust did 466/772. <-- Now there is NO WAY that is right...
Sure, I can build a custom program that will lock the converter at 10mph, roll through the gears and hold 5th gear 1:1(which is actually the 4th gear shift).
Some dyno operators will dyno trucks in OD, since that's the way most of the larger turbo trucks, specifically Cummins, are dyno'd. It helps load the truck up, spool the turbo's quicker, and will also allow for more rpm/mph since it won't shift to the next gear.
HP get's you the mph(racing or pulling), that's for sure. The torque defintely doesn't hurt getting you off the line though. A good balance can be hard to achieve, but very posssible. Especially with the higher RPM diesel's we have today.
In the farming world, we gauge our tractors by horsepower and could care less about torque numbers. Been that way for years. I don't know why, but I imagine theres a damn good reason for it.:flipa:
Perhaps because it's actually a relevant number?????oke:
In the farming world, we gauge our tractors by horsepower and could care less about torque numbers. Been that way for years. I don't know why, but I imagine theres a damn good reason for it.:flipa:
Perhaps because it's actually a relevant number?????oke:
Actually, you do care about the torque, just not the peak torque value. what you worry about is the shape of the curve. In the Ag market, the peak torque tends to be pretty low in the PRM range, then decrease as the engine speeds up. This allows an engine to pull down under a load and still be able to recover once the load decreases without any change in the throttle setting. Thankfully, this is fairly well understood, any manufacturer of any halfway decent reputation will do that.
The HP rating basically tells you how fast you can work, or how wide the cultivator can be and still drive the same speed.
Makes me feel a little better about my "low" numbers.
I still gotta get a weight to go with my trap speeds, but assuming 8000 (tool box loaded, 3/4 or better in the fuel tank and others) trapping 89 makes it look a little better.
Lolz... Yea I understand what you're saying CD, I was being a bit of a smart a$$ considering the topic. Figured with all the sarchastic personalities in this thread SOMEONE would pick up on it.oke: Fail on my part I guess....:doh:
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Ford Power Stroke Nation
2.5M posts
107.4K members
Since 2007
A forum community dedicated to Ford Power Stroke owners and enthusiasts. Come join the discussion about diesel performance, modifications, EGR deletes, troubleshooting, lift kits, tires, wheels, maintenance, and more!