truckmike26
New member
'06-'09 FJs are rated 266 hp on premium fuel and 4Runners 236 on regular. Does this mean using premium fuel in a 4Runner equals a 30 hp boost?
FJ Cruiser Premium Fuel vs. 4Runner Premuim Fuel
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PaulB-2006 T4R
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unfortunately no
truckmike26
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Why not?
truckmike26
New member
So one DOES get a 3 hp boost by using premium. Better than a kick in the teeth!
Synister
Member
truckmike26
New member
That was helpful. I mixed up all the numbers in the original post -- it was a late night last night. That's an easy mod to get 3 hp and 12 ft./lbs. Costs more, sure, but that's life. I wish Squires made a turbo for this truck.
truckmike26
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One thing about the newer, '10-'11 longitudinal 4.0L GR -- I thought Toyota went with hydraulic lash adjusters.
truckmike26
New member
How do you figure that?
Madakira
New member
When the power runs through the trans, it loses power. Have you ever dynoed your truck? I used to go to lots of dyno events. I would dyno my truck every so often. 555 at the crank would often equal about 490 at the wheels. It is pretty common knowledge once you get into the horsepower game. I never knew this either, until I started running my truck on the dyno.
Madakira
New member
Hmm, I am sorry if I can't explain this very well. I will try to use an analogy. Imagine your arm is the engine, a rubber band is the transmission, and a brick is the wheels and they are all attached in a row. If you use your arm to pull the rubber band to move the brick, the rubber band will stretch and eventually move the brick. Now if you replace the rubber band with a rubber band twice as thick, it won't stretch as much, and the brick will move quicker. So by strengthening your trans, you can transfer more power to the wheels, but will still lose some power. The is why funny cars have more of a direct drive system, than a long trans, and also why many super cars have the engine in the rear.
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truckmike26
New member
I repair engine and transmission dynos as part of my job. I was just curious at how you arrived at those numbers.
Madakira
New member
well, I am not sure about the exact numbers, but I am guessing you lose close to 15%power. I used to have a Dodge Diesel and most guys at the dyno events were losing about 15%. I am not sure it would be exact, but I would guess pretty close depending on mods to tranny and engine
truckmike26
New member
For stock gas cars and trucks, the rule-of-thumb over the years has been a 20-30 percent loss but maybe that's changing as transmissions and diffs and everything else has become more efficient. Diesel light trucks are in another class all their own. These engines power 30,000-lbs buses and medium-duty trucks. Like a small-block-powered lawn mower, the drivetrain friction means much less to these engines. As well, these medium-duty diesel engines are so internally heavy compared to gas engines it's like they're their own flywheel. This discussion is making me want to buy a diesel full-size. Damn.
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Madakira
New member
Well, my 04.5 Cummins H.O. was about 555 at the crank, and I would only put out 470hp 1100 something torque. So that is about 15%. But if you are saying gas cars these days lose about 20-30% that isn't too bad. Diesels are nice. Lots of HP and good mileage. And they can carry some weight and still get awesome acceleration.
truckmike26
New member
The rule-of-thumb HAS BEEN 20-30 percent for typical street gas cars and trucks. Obviously, a blown 540 c.i. Chevy Nova with 4.56 gears and a Powerglide would be less.
PaulB-2006 T4R
New member
Holy crap I stand corrected, from wikipedia; "An updated version of this engine features Dual VVT-i, increasing output to 254 hp (189 kW) and 270 lb·ft (366 N·m) on 87 octane and 285 hp (213 kW) and 289 lb·ft (392 N·m) on 91 octane."
If I owned a Gen 5 I'd be running 91 for sure but since I own a Gen 4 3 HP is not that exciting of a HP gain.
