MazdaManiac

iTrader: (3)

What I'm saying is, you don't know what your "loss" is.
Its an estimate based on a mystery variable.
Ignore your crank power estimate. Its meaningless.

speedy33

could it be that the dsc cut the power over 6000rpm?
i disable the dsc in the first run (hold 10sec). and the 2nd run i pull the dsc/abs fuse with the same results.
if you take a look on the whp chart you see after 6k it doesnt gain any power but normal the whp should go straight up like the crank HP chart.
it looks like something cuts the power down.

could it be that i should pull the room fuse or only run in the 3rd gear and not in 5th gear?

i read that some people have problems with the dyno because the front wheels doesnt spin..

cheers
martin

MazdaManiac

iTrader: (3)

Holding the DSC/TCS button down is fine.
Dyno in 4th, not 3rd or 5th.

Your dyno looks typical (give or take 10 HP) for an untuned car with he Mazsport ignition.

Brettus

iTrader: (2)

/\ not an issue . All you do is turn off the DSC and dyno - everything else you heard is myth

speedy33

thank you guys!
as i write in a previous post, i had 170whp as the car was stock.
with that mods i should have 180-190whp.
my engine is in a good condtion because i have done a compression test.
the typical drivetrain loss should be 17-20% right? so why do i have nearly 40%?? something goes wrong here..
and i think i can feel the difference between 150 and 190hp and the car have more power than stock. i'm pretty sure about that

Brettus

iTrader: (2)

wheel slippage on the dyno perhaps ....

MazdaManiac

iTrader: (3)

I've seen more than a few cars with your mods lose power.

speedy33

and why??

i wish someone write something that really make sense..

is that because i have not so many posts on this board or because i'm from europe and my english is not that good??

MazdaManiac

iTrader: (3)

Sorry. I didn't think I was being cryptic.

Simply adding a header, intake and exhaust will not necessarily make any more power than stock and the disruption to the airflow and the changes in tuning from the MAF scale being altered may actually make you lose power over stock.
And the Mazsport ignition has been shown time and time again to lose power compared to fresh stock coils.
Since your motor has no tuning to take advantage of all the aftermarket modifications, you have no idea how far from optimal your ignition timing, dwell, AFR and S-DAIS staging are.

Your dyno results are also misleading because there is some mysterious "correction factor" being used to persuade you to believe that the motor is making a lot more power that is somehow making it through the driveline.

Wenn mein Deutsch besser waren, würde ich in deutscher Sprache zu erklären.

laythor

with every change i've made to my car (intake, exhaust, midpipe, coils, ap) my dyno numbers have stayed with 5 hp of the original numbers. now my torque has gone up. I'm kinda suprised by NA guys who want to see bigger numbers. I dunno, maybe it's just me and i'm happy with my car

speedy33

thanks guys..
that helps me
next week i drive to another dyno and see what happens.
maybe pull with 4th gear or something.

i dont know that this mazsport ignition is such a crappy stuff.. i plan to get the bhr ignition and i hope if i ever get this supercharger i made the numbers i wanna see.

thanks again

RWatters

iTrader: (5)

2004 Mazda RX-8 with a K&N gen 2 intake and a Borla cat-back exhaust system. Original motor. Car has new coil packs, spark plugs, and ignition wires in the last 2,000 miles. I've only owned the car for three months so it looks like the previous owners took care of it! I was expecting numbers around 170whp so I was BEYOND excited to see the results. Yes it's in STD format so subtract a few horsepower and you've got your SAE numbers.

Couple of things about the dyno runs:

1.) All runs were done in third gear. I could have made more power in fourth but each run would have taken so damn long I told them not to bother.

2.) The A/F ratio was nothing to be worried about according to the guys that ran the dyno. The guy running it is without a doubt one of the best tuners in the area for just about everything so if he says it I won't worry about it. He says the blip at the end is when they let out, and the blip in the middle was probably a fluke. He also said they couldn't get the A/F meter to mount securely in the exhaust tip.

3.) All three runs were done back to back with no rest time for the car which is why it lost power. Today was a dyno-day special so they were in the business of getting cars on the dyno-and off as quickly as possible. On the last two the A/F dropped noticeably which IMO shows how much the K&N hates heat.

tofu_box

Hi all
This is my dyno sheet for a RX8 04 model auto (flame suit on)

Now the top red and blue lines were with a LT-10 tuned by Promaz

The Green line is a stock ECU.

This made me decide to take the LT10 out.

But what i am asking is does my curve look alright? is there any defects atm?

Mod Lists are

Promaz Ignition Kit
Microtech LT-10 (on & off)
Magmaflow Custom Exhaust
Revi Beat Intake + Duct
AP Underdrive Pulley

Car has done about 100,000kms

I am on order at
-RP Supercat
-Xtreme Rotary Headers
-Borla Exhaust
-Hymee Protuner

Any comments will be appreciated

In terms of HP its at 125.3857HP

VashCloud

imma like a little confused with numbers here.

My wife car is stock except the MS exhaust and makes 190whp 127torque. How is it modded vehicles are making less?



MUSTANG dyno done @ UP garage. Only 45 a pull. 5th gear, dsc off.

RufusVonStorm

190whp on mustang stock? wow.

Brettus

iTrader: (2)

That engine is a keeper !!!!

VashCloud

ya we bought it used ceritified from Mazda dealership. It already had yellow matching rx8club stickers but i havent been able to find the original owner.

Picked it up for 11.5k. I got a AEM CAI for it, havent installed but will do dyno when i do. Then RB headers and cobb tuner. Im hoping for 200whp which i feel shouldnt be hard.

VashCloud

Also my car had 56k on it when we did the dyno...

So I went back through all the old post and I am still shocked that I am one of the best stock vehicle dynos. It doesnt make sence....

Especially when I see vehicles with mods making less than me...

RufusVonStorm

Slightly off topic, how much quicker does your s2k "feel" compared to the 8?
Both were on a mustang dyno?

VashCloud

Really they feel the same until about 5k then the s2k you can "FEEL" it pull you more as V-tec kicks in. Torque wise they are about hte same. If i could find my dyno chart for s2k, you would see the s2k has a better powerband.

Also, the s2k weights almost 300 pounds less than my Rx8 so thats a big difference. (s2k=2786 rx8=3024).

They both do 9k, both handle like monsters. But I know the s2k could take the 8. Saddly for my wify.

Brettus

iTrader: (2)

Fixed

cliffkemp

for the record, every mod i put in my car, the power went up about 3-4 hp and 2-4 tq. currently, my cat is on its last leg and my car has no top end power at all.

I got a talon for my daughter and have been fooling with it lately, it puts down 264tq and 220hp at the wheels (awd) Going to take my 8 to the dealer sometime soon and see about the cat. Its still under warranty so, no charge and will do another run after and see how it goes. All I have done to my car is flywheel, intake/exhaust, and pulley. Just before the intake, I dynoed it at 141tq and 194hp. Stock it was 133tq and 181hp.

The graph above seems a little confusing. I thought the port opens up at 7200rpms. Above, it shows 7600. I could be wrong but my dyno showed about 7200 for the high rpm port to activate, so to speak.

VashCloud

lol!!

GeorgeH

iTrader: (2)

Question for the group -

About a year ago, I had my '04 MT tuned by Cobb on their Mustang Dyno. Car made 210/144.

So, this year, the car has felt a little soft, so I brought it in for a checkup. Mind you, I've made no mods to the engine or drivetrain. Coils & plugs were replace about 3 months ago. I am running heavier oil now, and premix. That's it.

Car still made 210 Hp, but peak tq fell to 135 or so. And, torque is off by 5-8 ft-lbs between 4,000 and 8,000 rpm.

A/F was richer by a point, but they are using a new O2 sensor and claim that at least part of the difference can be explained there.

Any theories? I'm hoping the peak numbers mean the engine & cat are still healthy, however that's just an assumption - is it common for an engine that is falling off to make the same peak Hp but just fall off the midrange? Doesn't make sense but I thought I'd ask.

I do have an appointment next week to try & tune the midrange back in, but I thought I'd post here - do sensors change over time, requiring an annual tune-up? Car has 55k on it.

Thanks,

George

jasonrxeight

seals are probably good
Im thinking dirty air filter and MAF?
plugs and coils?