Stroking doesnt give you anymore hp, torque yes. Unless you have the ability to make more torque in the higher rpm, then yes you increase your hp.

 

Methanol alone does not increase hp. It enables you the ability to.

People have different setups. No two motors or no two tunes are the same. Different altitude, cams, timing, fuel etc... all contribute to the way your motor will perform.

 

huh? how is that so? bigger liter with lower compression will help you extract more power with much better torque curve I don't see too many 800whp z's on a 3.5.

 

Doug- the dyno he used is called a "Dynapack." That's dyn-A-pack. FYI.

Congrats to the OP. Very nice, smooth curve and huge power. Be safe and enjoy. Please post pics and video of your car and also a 1/4 run!

 

stroking does give more hp.. look at all the 4.2 GTM Dyno's.. cars are putting out close to 100 whp more at the same PSI

 

I never said Methonal increases HP.. i siad methonal tuned cars can go over 600.. because you can tune more aggresively with methonal


true.. but all dynopack threads have higher numbers than DJ or DD because Dynopack is measured at the hubs.. not at the wheels

 

Stroking alone will not increase hp. Take an S2K for example. It increase displacement by .2 liters, yet hp remained the same. The reason why it did not increase hp is because of the lower redline.

Increasing displacement increases torque because a greater volume of air (and thus fuel) is combusted per revolution, imparting more force on the crank and thus producing more torque. However, without changing the rest of the setup, you are not actually flowing more total air, so power stays the same. That is why a stroked engine generally pulls the curve to the left and inflates the torque curve (more torque produced accross the RPM band), but doesnt increase HP on a given setup (the ONLY way that would happen would be if the HP curve is still rising at redline, meaning more airflow could be obtained at the same redline by increasing displacement).

 

so how do you explain all the 4.2L GTM Dyno's that show drastic HP increase?

 

I have not seen a comparison between a stroked 4.2 vs a 3.5 with the same boost levels and turbo kit.

 

So can tuning for 105 unleaded race fuel (or higher octane leaded)..

 

Not only that, but what else was done to the car. It could be the same boost level, but the level of head work and exhaust design on the 4.2 could have been superior...

Doug likes to bench race stats instead of pulling from his own experience. He is a true internet master mechanic.

 

Congrats on the power increase, but Doug is right.... Dynopack dynos dont factor in traction and wheel spin.

Go to a dynojet and make a pull.... if you make 600whp then everyone will shut up, but doubt it.

 

Doug is right about the other Dynopacks he has read about. He knows zero about the OP's dyno or how it is configured. He had an answer in search of a question.

 

I'm almost done with my build and will have it on a Dynapack and a Dynojet. It won't be a perfect comparison, but I'll let you all know what the difference shows on my particular situation.

 

If you read the graph, HP was still climbing. If it was pulled another 250rpm like the compared run, it might have been 610-615.

 

Horsepower is a function of torque and engine rpm, so yes if you stroke you will gain torque, and depending on if it holds on the top end, horsepower. That being said, a larger displacement stroked motor will only make more horsepower if the cams, valvetrain, and heads can flow the larger volumes of air and exhaust at higher rpms.

 

Congrats Jokestrap..I am happy to hear that you finally have your car back on the road. Enjoy!

Every stroker kit we have ever done...GTM, BC, Evo's...all make plenty more whp AND trq at a given boost level. If you take the stroker to the extreme...then absolutely, you will run out of RPM before you make an increase in whp. But that is not the case with these little strokers.

 

I took my car to phillydynoworks after getting it tuned at 600whp on a dynapack. i drove the car through center city, strapped the car to the dyno after a 45 minute cool down(which isnt much) and ripped off a 580whp run. thats about a 4 percent loss in power once i bolted up my 19" volks. plus i was running 93 octane and i forgot my tuner had set a 100 octane map which has a slight power increase. bottom line is, dont always believe the hype. this particular dynapack didnt read as low as what people say. congrats on your 600whp number, and if you are looking for some validation on this forum, forget it. no matter how good your intentions are, there are vipers in the FI section ready to **** in your corn flakes.

 

haha^ well put.

 

Just like anything, dynos require calibration/setup/conditions/etc. These settings dictate readings. You can make a dyno read whatever you want it to by minipulating these settings. So to say one dyno reads lower than the other is incorrect. In a controlled enivornment, all dynos being setup the same, then yes...this would be correct.

So when someone presents a dyno, I take it for what its worth...an instrument in the quest for more power. Whats the use in picking apart the dyno when it could be setup any number of ways.




lol @ internet master mechanic.....doug acts like he's the only that reads the threads around here. lol.