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Thread: The 2LT Diesel Dyno Panga

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    Default The 2LT Diesel Dyno Panga

    Well I guess all the hp and ft.lbs talk and no dyno got to me in the end and I finally found myself with the guys at HPR Islamabad requesting some for wheelspin on my lightweight diesel 4x4. And before everyone gets all excited... the pics do look better than the results The 2LT Diesel Dyno Panga - icon e smile

    The 2LT Diesel Dyno Panga - filephp?id3936


    The 2LT Diesel Dyno Panga - filephp?id3943



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    I was looking to do before and after dyno tests before getting some work done on the pump and the boost controller and figured that the dyno was the best way to check the results.... primary objective being to boost low end torque for offroading.

    The 2LT Diesel Dyno Panga - filephp?id3946

    The 2LT Diesel Dyno Panga - filephp?id3945



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    55-60 whp? guessing

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    Quote Originally Posted by Saaduk View Post
    55-60 whp? guessing
    Nice! Well, the thing was that once they hooked it all up, the HPR computer (not configured for diesel engines) was not able to pick up the RPM from the diesel pump. So at this stage, the primary objective of torque tuning went out of the window and it was my decision to play or not to play the somewhat of a futile HP testing game. Nevertheless, with several heavy weight personalities waiting around for the featherweight show, I decided to proceed regardless of the missing torque readings!

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    The ride looks very beautiful Mashallah. Just need some 33 inches BFG and a 2 inch lift.

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    For the record its a later model 2LTE on which the electronic pump has been replaced with a mechanical one. It runs onto a Hilux/Surf 5 speed manual transmission which is bolted onto the original CJ7 rear diff, an AMC 20 with 4.1 (10:41) gearing.... a typical marvel of desi engineering.

    The 2LT Diesel Dyno Panga - filephp?id3944

    The diesel pump is in decent shape though the boost controller and the diesel settings are not fully tuned up. The turbo is in questionable shape as it does leak a little bit of oil and without no meter we were unsure of how much boost we were running, though the HPR guys were guessing it was no more than 4 psi. Anyways, we let the baby roll...

    The 2LT Diesel Dyno Panga - filephp?id3948

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    The first set of results I guess were respectable enough on peak power (though somewhat boring without the torque and rpm reads) but the curve shows a distinct fall after an early peak. The two runs on the left are in 2nd gear while the third on the right is in 4th gear.

    The 2LT Diesel Dyno Panga - filephp?id3949

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    It was pure panga time as we played around a little bit with the boost and diesel settings to see if we could make a difference. We called it quits on the final 4th gear run as both the diesel tank and my pocket were running empty while the engine sounded if it was gonna explode.

    The 2LT Diesel Dyno Panga - filephp?id3950

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    Quote Originally Posted by SuhaibKiani View Post
    The first set of results I guess were respectable enough on peak power (though somewhat boring without the torque and rpm reads) but the curve shows a distinct fall after an early peak. The two runs on the left are in 2nd gear while the third on the right is in 4th gear.
    Thank you for a very interesting thread.

    You can always try this too:

    In a legal and safe way, make a little test run area. Mark out exactly one quarter of a mile (1320 feet). Weigh the vehicle with a full load of fuel and driver (you can do this at a commercial place that weighs trucks, or place four weight scales under each tire simultaneously, or just use a published figure and add the weight of the driver for an estimate). Start an acceleration run through this distance. When you are crossing the end line, note your speed at that point.

    Now use this formula to get an estimate of bhp at the wheels:

    Horsepower = Weight x [(speed/234)^3]

    For example, for a vehicle that weighs 4000 lbs, and is travelling at 50 mph at the end of the quarter mile run:
    Horsepower = 4000 x [(50/234)^3] = 39 bhp approximately.

    Now consider the type of transmission and estimate the drivetrain losses at about 15% for a manual and 20% for an automatic gearbox. Correct for an additional 5% loss if the vehicle is four wheel drive.

    So the horsepower at the flywheel is approximately 48 bhp.

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    Quote Originally Posted by VCheng View Post
    Thank you for a very interesting thread.

    You can always try this too:

    In a legal and safe way, make a little test run area. Mark out exactly one quarter of a mile (1320 feet). Weigh the vehicle with a full load of fuel and driver (you can do this at a commercial place that weighs trucks, or place four weight scales under each tire simultaneously, or just use a published figure and add the weight of the driver for an estimate). Start an acceleration run through this distance. When you are crossing the end line, note your speed at that point.

    Now use this formula to get an estimate of bhp at the wheels:

    Horsepower = Weight x [(speed/234)^3]

    For example, for a vehicle that weighs 4000 lbs, and is travelling at 50 mph at the end of the quarter mile run:
    Horsepower = 4000 x [(50/234)^3] = 39 bhp approximately.

    Now consider the type of transmission and estimate the drivetrain losses at about 15% for a manual and 20% for an automatic gearbox. Correct for an additional 5% loss if the vehicle is four wheel drive.

    So the horsepower at the flywheel is approximately 48 bhp.
    @Cheng: Many Thanks. Thats very interesting....could we also use an approximate RPM reading on the curve above (assuming it was going goes from 1000 - 4000 RPM on the 4th gear run) and work back an approximate torque figure?

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    i am sure this would be something new for the hpr guys as well
    diesel jeep tuning. thanks for sharing hope it was worth the money u spent!

    @vcheng
    nice info!
    Life is short and very unpredictable just like a Quarter mile .....

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    Quote Originally Posted by SuhaibKiani View Post
    @Cheng: Many Thanks. Thats very interesting....could we also use an approximate RPM reading on the curve above (assuming it was going goes from 1000 - 4000 RPM on the 4th gear run) and work back an approximate torque figure?
    For the RPM reading, I would suggest working backwards from figuring out the diameter of the tires, then working back through the gear ratios to come up with the rpms of the engine for a given speed in each gear at any given speed.

    I hope I am clear, otherwise I can give an example.

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    A round of thanks is in order for the supporters of what seems to be the first diesel 4x4 dyno panga in the country:

    - Mechanic Farooq Awan for accompanying me after his work day and tuning the pump between the runs. Not to mention putting the Jeep together in the first place and maintaining it for the past 6 years.

    - Jahangir and Humayun Mir for taking the time out and dropping by for moral support and encouragement.

    - All the guys at HPR: Adil, the Ustad and the helpers for their excellent services and support in addition to the great job they are doing for the Islamabad auto freaks. Wish them all the best...I will be billing them for this free publicity on my next run

    The 2LT Diesel Dyno Panga - filephp?id3953

    And last but not the least cheers to the master racer from Peshawar (sorry didn't catch the name) for egging us on for the final run

    Thats all for the day folks. As yet not exactly sure what was gained or lost but it was a fun panga..... worth doing and definately worth writing about.
    Look forward to your views and comments.

    Thanks for your interest.
    SK

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    Quote Originally Posted by VCheng View Post
    For the RPM reading, I would suggest working backwards from figuring out the diameter of the tires, then working back through the gear ratios to come up with the rpms of the engine for a given speed in each gear at any given speed.

    I hope I am clear, otherwise I can give an example.
    @VCheng: I got you! Thanks again....that's brilliant!
    I guess I have a fair bit of work to do to make it worth the money spent

    @Hash4u: Hehe... as yet it seems it probably wasn't I guess we'll have to work to make it into something worthwhile!

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    Quote Originally Posted by Saaduk View Post
    The ride looks very beautiful Mashallah. Just need some 33 inches BFG and a 2 inch lift.
    @Saaduk: Many Thanks...true beauty lies in the eyes of the beholder! Will give the BFGs some thought though with these gear ratios, the 2LT will not hold up 33x12.5s. Will probably also lift it properly at some stage instead of re-arching the CJ springs, which gradually lose their arch over time.

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    dont u have a tachometer in ur jeep?
    if so; u can plot the rpm against speed, and use lb-ft = hp x 5252 / rpm
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    thats really nice...for sure its for the first time in pak

    @vcheng

    thz for the info.........can you tell the out put of 135km/h at 1/4mile with 850kg
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    Out of curiosity, how much does the Dyno run cost ?

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    Quote Originally Posted by rozzzzz View Post
    thats really nice...for sure its for the first time in pak

    @vcheng

    thz for the info.........can you tell the out put of 135km/h at 1/4mile with 850kg
    850 kg = 1870 lbs
    135 kph = 84 mph

    Horsepower = Weight x [(speed/234)^3]

    = 1870 x [(84/234)^3] = 86 bhp approximately at the wheels.

    Estimating drivetrain losses at about 15%, the horsepower at the flywheel is approximately 99 bhp.

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    Quote Originally Posted by RedBull_ar View Post
    dont u have a tachometer in ur jeep?
    if so; u can plot the rpm against speed, and use lb-ft = hp x 5252 / rpm
    And how are you going to find out the lb-ft without a dyno on the road?

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