Well, I don't think it makes that much of a difference. I don't think you can messure it like that. An engine does not lose 7whp every two years. My 8 year old s2k with 85k miles on it last month put down 201whp with just a test pipe on the same kind of dyno. Anyways, I wouldn't worry about it OP, like everyone else said, alot can factor in weather wise, temp wise, and yes, the gear issue too!

 

hmmm, stock AP2s seeem to consitantly put down around 210 whp on the local shops Mustang Dyno. Not really sure what AP1s put down, but I would have a hard time believing that it would be 20whp less. Either your mods have really killed some hp or you have some issues that are killing hp

 

From what I've seen:

00-01 put down ~190
02-03 put down ~200 (different ECU)
04-09 put down ~210 (different engine and ECU)

Also, bolt on mods don't give you much power and can rob it in some applications. Unless you're swapping the mods while the car is sitting on the dyno, you can't expect to see realistic changes in numbers; every dyno is calibrated differently and conditions are always different - your old dyno numbers are basically meaningless now. Imo a 70mm pipe makes more noise than power on a NA car like you have - if you think you lost power, you probably did when you went to the bigger exhaust.

 

I hear ya man but the thing I really dont' get is I pull hard on my friend's '05 RSX with I/H/E/kpro. Then I have another friend that I pull hard on who owns an 04 s2000 with my old exahust and tp which was the buddy club exhaust. Both drive like I do. Shift all the way to redline and they shift fast... So I really don't see what the difference is in driver.

I have a bunch of stuff in my trunk too; including a hardtop with the soft top underneath it so that's obvisouly more weight then my friend's 04 s2k that only has a softop. And he pretty much keeps it clean. Has nothing in the trunk except a few papers and folders. Hmmm? lol I dunno what to say man. I'm guessing which I really did notice from the get go is the greddy 70mm. Ever since I changed to that, I pulled both of em even harder. Harder than my old set up which was the buddy club.

All in all man, I jsut wanted to see if I had gained anything from the "baseline". But like what you said which is true, the old dyno means nothing.

Lol, and to put icing on the cake. I pretty much made my friend who owns that rsx quit. Back then, we used to race a lot and we were pretty close at some point but when I switched to snorkel, greddy exhaust and 70mm tp. It was obviously a different story which I pretty much shut him down. Lol

 

Maybe sometimes... but there is no way you can accurately bracket these cars - there are just way too many variables.

My buddy has an 00 and put down right around 200 on a dyno jet, my car was never dynoed until I got it, but I know it ran a 13.5 at the strip with the only mods being an intake. In anticipation of high numbers, I went to the same dyno as my buddy had about a year ago, and my best was around 190/130, and mine is an 02.

I mean, just look at the recent issue of Import Tuner where an 05 with around 60k on the clock put down 160/113 on the dyno.

After my first dyno experience, I was pretty discouraged, but I have since learned that numbers are numbers. Real world application is the best way to interpret how your car is doing imo.

 

Maybe running on 3 cyliners . There is no way that an 05 that is running properly should put down anywhere close to that.

While it may be difficult to actually predict what cars are going to dyno on a given dyno, I think what Saki was trying to convey is the changes in the various years and the impact on whp. So take a 00-01, 02-03, and 04+ on the same dyno, the 002-03 should make more whp than the 00-01 and the 04+ should make more power than the 04+.

 

the dyno adjusts for gearing, so technically it should make the same power in either gear , within reason.

However, a 4th gear run takes much longer to hit redline from the start of the run. If the engine temp changes or the cooling fans activate during a run that takes longer it can cause power to drop. I would prefer a 3rd gear run as it takes less time to complete and puts less load on the drivetrain, so you should get more consistent runs back to back compared to higher gears. Just my opinion.

 

It depends on the type of dyno.

Gearing seems to have a greater effect on the results when dynoing on an inertial type dyno (Dynojet) rather than on an eddy current type dyno (Dyno Dynamics, most Mustangs).

Either way, 7 HP is a negligable difference for before and after dyno pulls that are 2 years apart.

 

I'm not using that 2 yr old dyno result as my baseline anymore. The 190hp is the new baseline with 90 deg. temp. I'll be getting a Giles emu in 2 weeks hopefully sooner. Then I'm going to put it on a dyno to see IF I gained anything. If not, then I'll just keep the gemu for the 4k vtec. hehe. But anyways, I'm pretty sure Ill gain some good hp out of that tune.

 

who cares what numbers it makes?

anyone who says x car should make y amount of power doesn't know what they're talking about. you want to see if you made or lost power by adding/changing mods? go to the drag strip. et and trap speed will tell you all you need to know. dyno's aren't the end all be all of how much power a car makes. sure it can be comparable if all the variables are the same(temperature, humidity, barometric pressure, same dyno), but the numbers really don't mean anything. I can go to a dyno and make it say i have 400whp on my stock s2000. does that make it right? of course not. a dyno is a tuning tool and should only be used as so. you're wasting your money if you think you can go to the dyno to make a few runs and not change any parts or do any tuning between runs. % increase is what you should be looking at. the numbers don't mean sh*t and they're not comparable to other dynos.