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[Daninski]

No one hates the K8 it's just very under powered compared to what Mazda could of put in the car. You horse power numbers are unrealistic for the mods or should I say changes you've done. Better grounding could mean better spark but that would only give +2 or 3 HP at best. If we seem to be a little harsh on you I'm sorry for that but on MX-3 we call it as we see it so one things for sure. We won't intentionally sell you a bum steer. Welcome to MX-3.com and don't forget to donate to support the site.

[motorcycle man]

how in the f--- did you get 170hp out of the k8 without major modification? are you sure your not running a klde?

the biggest problem with the k8 is the fact that once any of the sensors etc get changed, it destroys the way these things run. mine always ran good, but i thought it could run better. i cleaned the egr, dumped the cat, put a turbo muffler from advance auto on it, cold air intake, and added some extra engine grounds. i get 36 mpg on the highway with the cruise set, and 31 with the trailer with a quad on it. it took some digging to get all the sensors set right, but yah, the 170 suprised me. didnt get a big gain till the cat disappeared and the turbo muffler went on.

Post your dyno results or I call this 100% BS, I've had a k8, a kfze, and a klze... NONE of them produce 170whp to the wheels except the klze its IMPOSSIBLE for a 135bhp engine to produce 170whp with what you've done... I dropped 8k in my KF and had Sunbelt Performance, Manley Performance, and MOCA help build the engine and the most it was pulling 160whp on an engine thats rated at 170bhp, swapped to a klze swapped all my bolt ons and Hit 172whp on an engine rated at 200bhp.


i think your right on that dyno. i finally dug it out since i knew there would be someone that would deny it being correct. i too myself thought it seemed a little excess. here is what i found wrong on the dyno sheet. in the little box that says number of cylinders, it is marked 4, not 6. this basically means there is no way the dyno is correct since the torque and horsepower cannot indeed be measured the same. you are correct on it not being right. i guess i should have asked the clown running the machine that day if he switched it. a 4 hour drive to des moines for a wasted incorrect reading. you were right, its not right.

BS unless Dyno is posted

[mikeinaus]

prettymuch everything youve done is what the car would have been brand new. when it was new mazda rated it at 130hp 115tq. i highly doubt removing the cat and throwing a "turbo" muffler on would increase 40hp over original benchmarking

The 1.8 L (1845 cc) K8 is among the smallest production V6 engines ever; and also the first K-series engine to be used in a Mazda car (in the Mazda MX-3). It was a DOHC 4-valve design with VRIS and a 75 mm (3.0 in) bore and 69.6 mm stroke. It produced 130 hp (97 kW) in US trim (sometimes referred to as "K8-DE"), and 135 hp (101 kW) in Japanese trim (the "K8-ZE") on introduction in 1991 and 144 hp (108 kW) and 115 ft·lbf (157 Nm) at its best.

also keep in mind when the motor was originally dyno'd it wasnt in a car. it was dynod at the crank on an engine stand with proper grounds and perfectly functioning/adjusted sensors.

you ither have a kl-de, or a horribly tuned butt-dyno

[motorcycle man]

yes on the dyno. the clown running it forgot to switch the machine from 4 cylinders to 6 cylinders. the dyno reading is a complete flop. 4 hour drive one way only to pay for a wrong answer. this has happened twice in the past on the motorcycle dyno.

[fowljesse]

You don't need to change the IM to turbo it, but you can port it, and take out the VRIS for a little more gain with boost. The KLG4 IM might be better with boost, if you port match it.

[Custommx3]

A dyno measuers horsepower based on rotation of the cylinder drum the wheels are on, it has nothing to do with a setting for 4 or 6cl. The dyno doesnt care what kind of engine you have, it just measures power outputs.

[fowljesse]

The difference it could make is the weight difference. I know that they have to put the weight on there, but don't know if that makes that much difference. Maybe they compensate for it.

[motorcycle man]

well, i will say, when dynoing anything, it does matter on the number of cylinder. i will explain the difference. i took a 1985 suzuki gs 1150 which is a built bike with 145 horse. we put it on a dyno, and the dyno was set on 2 cylinders for a harley that was dynoed earlier. the guy forgot to enter in the correct number of cylinders before dynoing. we dynoed 114 horse with 176 ft lbs of torque. no way was it possible for this bike to have a reading where the torque is higher than the horsepower. we ran it 3 times. still unbelievable. loaded the bike up and brought it back to my home town. called the local place. they said we can sneek it in. i watched the dyno guy switch it from 2 to 4 cylinders on the screen. we dynoed the bike and it had 147 horse and 121 ft lbs of torque. the reason i believe my car dyno is wrong is the fact that a 4 cylinder engine has roughly a half inch longer stroke than a v6. a v8 has a 3 1/2 inch stroke and some have a 3 5/8 inch stroke. %90 of all v6 engine built in exception of the chevy 4.3, have a 3.2 inch stroke or less. i would haft to reference my shop manual for the k8 stroke, but its short. my buddy ran his s2000 before me, i never seen the dyno guy switch anything, atleast while i was watching. 2 other guys i talked to today said the same thing. if it wasnt switched, it wrong. there right, my dyno reading was incorrect. i would say to anybody else getting a dyno, make sure you ask if its set right. learn from my experience.

[wytbishop]

Well I don't want to start an internet war...but that just doesn't make any sense.

The drum of the dyno is connected to a device which measures the torque applied to the drum. It wouldn't matter if a twin, an I4, a V6 or a hampster applied that torque. If an outside force acts on the drum causing rotation, a torque is measured. That's it.

The HP is derived from the equation HP= (Torque * RPM) / 5252. If you look at your readout, you'll notice that the torque and HP lines cross at 5252rpm. If you look at the equation and substitute 5252 for RPM it becomes...

HP = Torque * (5252/5252) = Torque * 1 --> HP = Torque

This is true of every dyno readout done in Imperial units. It all started with a French guy...
http://en.wikipedia.org/wiki/De_Prony_brake" onclick="window.open(this.href);return false;

Something is not right about your dyno readout, but number of cylinders is not it.