I was just playing catch with my son using the Gtech and it recorded a 60' of 0.67 secs. The G's were off the scale.

As for mods on an NA engine, you will get very little gain with bolt ons such as intake and exhaust. You may have a slight peak hp gain with a less restrictive exhaust at peak rpm, but you will most likely loose more acceleration below the curve which will more than offset the added peak gain. You need torque down low and you may lose some of it by opening the exhaust on an NA engine. Unless you regularly drive at high rpm's, opening the exhaust up will cost you performance.

Changing the intake is more than just getting more air to the engine. Any change in the velocity of the air will also add or subtract from hp gains as will the total size of the intake. Bigger is not always beter. More is not always best.

Leaning your rich running engine out some will give you far more gain that an intake or exhaust mod.

 

I have recorded some pretty impresive top speeds on my Garmin too. But I have know idea how I did it.

 

Theoretically it should be so, but dyno charts I have done after all mods compared to original ones do not show any drops on power/torque in low range RPMs. they only show major boost in 4.5K+ area and almost exact same numbers in 2.5K-3K area.

 

Dyno shop I used charges $70 for 3 pulls. I find it reasonable enough.

Anyway, my modding urge is done, I like what I got out of my car, wife just complains constantly that it roars like a mad bear now but I can live with that.

 

Yeah, I know. How many dyno charts win races?

Dyno results often show gains and losses in power and changes in the power band when the same car is tested over and over again without any mods, so how can ANY change of 10 - 20 hp be attributed to anything other than the normal inconsistancy of the dyno?

It's funny how no one ever shows the bad results from dyno runs. The comparison charts always show "Run File 002" for the premod run and then jump up to something like "Run file 008". I wonder what the results were for runs 003, 004, 005, 006 and 007?

Study how a 4 stroke engine creates power and how the energy created is used and you'll understand why flow volume and velocity, restriction (pressure) and temperature of the exhaust effects the engine's performance.

But, why would anyone sell an upgraded exhaust system and tell people that their car will not perform as well? In most cases, torque will be less at rpm's below 3500 if the exhaust restriction is reduced on an NA engine. A car's performance starts wilh torque and uses hp to finish off the competition. The higher the maximum engine rpm is, the less the loss of torque will effect an all out run to redline.

But, if a good dyno chart is what you're looking for, there are many software programs that can produce a chart that shows whatever power levels you want. Print it out and keep it in your glove box and you be the fastest car on the road. You'll also save a ton of money on mods.

 

Baloney, man. There is consistency there, and if it is there it will be seen. If your car shows completely different curves at each run it means it has to be fixed. Arbitrarily denounce any dyno chart as non-representative just by the possibility of a factor of possible operator error is also baloney. Runs I did had curves hitting same exact path every pull. when it is consistent - it is consistent. Dyno charts is pretty much only tool that will allow you to see abnormal fluctuations of timing and AFR what may be caused by million of reasons making you ECU to do what it does.
I do not understand your grudge - any dyno run is just an analysis tool and it has no real substitute, if you know what to look at.

 

Really? And all this time I thought that the way the car performs on the street or track was the best test. Thanks for enlightening me? I'll submit a paper to the World Physics Foundation and request that they modify their theory on the operation of an internal combustion engine.

If I were you, I would remove all exhaust components from your car. Just think of what the dyno would show then.


Remember, marketing departments kill more brain cells than any other single thing the average person is exposed to.

 

'Car performs'? Car as any other mechanism just does what it is told to do by ECU. If you have no idea and inner understanding of how to tune this entire system - it is your problem, not mine. Better be enlightened then than to denounce pretty obvious well known facts.

 

RTFM. If you would know anything you would know that you CAN take it all off, with exception of headers. Find out why. Anyway, it is a pointless pickering. RTFM.

 

This is going to be good!

 

Are you seriously arguing this? You cannot dispute that the dyno is the most consistent way to measure power. Of course variables are constantly changing, but every dyno user already knows that, which is why they try to perform dynos on the same day (to minimize fluctuations in temperature, humidity, etc.) and on the same dyno. You simply cannot argue that testing modifications on a track is a better way to judge performance, because on top of all the same variables to which the dyno test is subjected, you are also adding human error.

 

Nope, it will not. It is not my mission to educate illiterate masses - they should pay for their own education. In mechanic fees, for ones.

 

So now the topic is about tuning the computer? What does that have to do with the fact that reducing the back pressure in the exhaust without ANY other mods will reduce low end torque? You aren't changing the debate to save face, are you?

 

Testy this morning are we?!

I am sure you will find that 1999 knows quite a bit, and from what I have seen in the past, not one to back away from a good discussion.

It is one thing to have a debate and argue your point and share your knowledge, but when people start getting pissed off during a discussion then nothing good comes of it...trust me I have been in a few of these.

 

Like any measuring device, they are only as good as the people that are controlling the variables. And will produce different results depending on which variables have changed and which ones remain constant.

http://www.caranddriver.com/features...ng_-tech_stuff

http://www.mainlineauto.com.au/produ...OWACCURATE.PDF