TeamRX8

iTrader: (25)

here is TQ curve, dotted blue line is pre-tweak and solid blue line is post tweak, starting RPM is 2250 and ending RPM is 8500 (peak HP), red line is the HP curve, they cross at 5250 rpm (same scale)

Brettus

iTrader: (2)

to be that consistent all the way through has to be by removal of some parasitic loss - yes ?

TeamRX8

iTrader: (25)

LOL, no

parasitc loss is usually RPM dependent

olddragger

iTrader: (3)

like the under the curve work going on. keep it balanced--i hate peaky engines you still running the knock sensor correct--havn't gone that crazy --right? nice tuning work.
I have forgotten --you do run synthetic oil dont ya? 5W/20 or have you seen the light?
olddragger

TeamRX8

iTrader: (25)

Knock sensor is mounted as OE, engine uses 5W20 Castrol GTX dyno oil, it gets changed fairly often though.

mlx8

Set of DynoJet drf data files for six runs, one each in 2nd, 3rd & 4th gears. Sept 28th, 2004 runs were made with the stock OEM flywheel in the car; two days latter the Sept 30th runs were made with a RacingBeat Light Weight Flywheel (LWF) installed.

The runs can be opened and viewed with DynaJets RunViewer available at:

http://www.dynojet.com/downloads/software.aspx

Be sure set up the run screen by selecting the dual graph on the top left and then pull down on the upper left hand side of the graph where it says "none" to power do the same on the right of the upper graph for torque. The lower left should have Air/fuel selected. That’s all there is to it. The software allows for toggling displays &/or adjustments for SAE (corrected for altitude, temperature & humidity) to raw uncorrected, and several standards inbetween. I don't know if this version of the software has been adjusted to, or for the "new" SAE standard now being used which would result in lower peak power numbers being displayed. I suspect that it has not. FWIW these runs were made at some altitude (@ 5,300' more or less) on a fairly balmy day (@ 70 degress F IIRC), and its is always relatively dry here in Colorado. The actual temp/barometric pressure (i,e altitude) & humidity figures shoulds be in the drf files and, as I recall, can be toggeled to be displayed.

A nice feature of the viewer software allows the drf files from the same, or different cars to be loaded directly on top of one another for comparison purposes. For example, I see that earlier in this thread Spin9k has a posted a dyno chart from a dynojet dyno showing pulls in two different gears. If he were to change the x-axis display from "speed" to engine rpm, the graphs would overlay one another.

Cheers

TeamRX8

iTrader: (25)

ok, the long awaited results graph, this is a factory stock 2005 RX-8 (solid) vs my flashed 2005 STU-modded car (dashed), rear wheel output run on the same Mustang dyno

EDIT: Summary of mods; custom intake box/filter, full custom exhaust WITH cat converter, AC delete, race pulley set, performance software flash, aftermarket ignition wires, the rest is OE/M

SilverEIGHT

Wow! Very nice and very smooth. That is the chart I'd kill for! It looks to be about 214 HP.

Lasse wankel

My friend has a 04 RX-8 that we dynoed today on a RotoTest hub dyno. Engine set up was: stock block 25 000 km HKS air filter w/duct. Unorthodox pulleys alu flywheel 3" exhaust w/ no cat 2 rear silencers 3" and of course Shell V-Power 99 octane fuel. The result was 207 hp at hub which should be 227-231 hp@8000 rpm at flywheel at static mode. I could not dyno any higher in rpm becausse the rew limiter kicked in. Next will be RE Amemiya header.

/Lasse

Brettus

iTrader: (2)

Do you mean "speed limiter " Lasse ?
you can add another 10 hp to that for the extra 500 rpm

olddragger

iTrader: (3)

nice picture. I think you just may have helped sell some ecu flashes--maybe they ought to give you a referral fee
olddragger

SilverEIGHT

OD... I think he just sold me on it.

Easy_E1

iTrader: (2)

Here is a picof dyno day results. I lost the L1 coil above 5500 rpm.
This a 2005 AT with a Mazdaspeed Twin Sport exhaust and that's it.
New coils are being installed today and we will dyno again in the near future.

mysql101

Here's my results.

Taken near sea level, conservative tuning. Wasn't going to max power.

I include the regular and the SAE corrected graphs.

mysql101

And just so you can compare ... here's 1st run (stock int-x) vs the third dyno run

TeamRX8

iTrader: (25)

simply posting dyno runs without stating what type dyno was used is pointless, estimated 10% difference between a Mustang and a Dynojet

Dalton30

WOW

impressive

jzief128

iTrader: (1)

I believe they are from a DynoJet. At least that is what it says at the top..."Dynojet Research"

TeamRX8

iTrader: (25)

I missed that, but have seen others posted without a good indication so it's really a general comment, it would still be best to point it out for the best relevance

mysql101

it's a dyno jet.

mattvit

dude, what mods did you do to get 275 whp?

swoope

iTrader: (5)

https://www.rx8club.com/members/mysql101-9185/

beers

RX82

I know that this is going to sound retarted. lol but I thought the mt rx-8 had like 235HP and the at like 210. I am just going off what the mazda wbesite said. This is a noob questin but I am confused.

Brettus

iTrader: (2)

ahhh- grasshopper you have much to learn ......

Read Read Read

mysql101

car companies always tell you hp the engine makes at the crank. That number is worthless since it doesn't translate to the amount of hp you actually get to use. There are losses in power due to drivetrain, RWD/FWD/AWD setups, among other things. So losses can be in the 10-20% range.

While mazda's website claims 230 hp, the car actually makes between 170-190 hp. The same goes even for a "400" hp corvette - it only puts down 300something hp to the wheels.

The dyno charts on this thread are for whp (wheel horse power), the actual power you get. So if a car makes 270 on a dyno sheet here, you can add back the 10-20% losses to get a number that compares with the original power quoted by mazda - in this case somewhere around 330 hp.