eforer

My dad is involved with vintage racing and the jaguar club of new england. He setup a dyno pull day at KTR Performance in Ayer, MA for his cohorts and snuck me in for the club price of $75.00 for 3 pulls. I've been to several other performance shops that have chassis dynos and I can say safely that thus far KTR's operation exceeds all others that I've been too. I used this dyno to tune my race car and I was anxious to see how my dead stock street rx8 did. The dyno dynamics dyno has a reputation as a "heart breaker" dyno as the results are typically 7% lower than a mustang and about 15% lower than a dyno jet. I was bracing myself for a really low number, I was pleasantly surprised.

Approx sea level, 73 deg F. Dyno Dynamics dyno at KTR Performance . For more info I the dyno dynamics chassis dynomometer see the KTR website.

I only attached the simple graph as I didn't get printouts for the graphs with variables other than tq and hp. I wish I had, my dad remembered and got his boost / afr graphs for his mazdaspeed miata (he snuck in another mazda in addition to his xk120 race car).

Here's the chart:



The car was dead slow when I bought it with 8k on it. It had an intake tube leak, bad plugs, bad coils and a bad cat. 2 trips to mazda gallery in Norwood, MA fixed all those issues and my butt dyno was happy. Glad to see the actual dyno agreed for once. BTW Mazda Gallery was great and did everything free under warranty with no hassel. Ask for Lee if you go there and tell them Ed sent you. They were a pleasure to deal with after my first dealer experience with another local place which was horrendous.

Brettus

iTrader: (2)

That does look very good for a Dyno Dynamics - I was around 170 & got to 189 with all my add ons .

eforer

I was pretty stoked. As I said, it has new coils, plugs, cat latest flash and venthilation tsb. Its completely stock though.

I think I can post this hear, but if its not cool I'll edit it out:

For those in the northeast, I'm trying to put together another group dyno day with NEPOC. I'd like to get as many mazda/rx8 enthusiasts out tfhere. It will be at KTR Performance in Ayer, MA. I'm trying to setup something for a saturday in late june/early july. The group rate should be $75.00 for 3 pulls.

swoope

iTrader: (5)

check the lounge.

btw,

happy birthday bitch!!!!

sorry for the hijack.

beers

The Ace

Forgot that I had gone to the dyno recently, so here's my dyno plot, and my A/F readout during this run. Mazda RX8 Challenge, 4port, 5MT box, 4th gear run.Mods are REVi + ramair and Trust PE Ti exhaust



For those not comfortable with Greek:
Wheel HP: 110HP/7125rpm
Crank HP: 188HP
Corrected HP: 193,5
Torque: 22,3Kgm/5145rpm (or 223,3Nm)

As for the A/F plot, you'll be amazed to know that my RX8 is NOT a turbo (which would explain the 11:1 A/F ratio ). I don't know what's up with my 8, but I'm certain 11:1 A/F is NOT normal (not to mention I have the REVi and Trust exhaust)

Black-8

This is mine, done on dyno dynamics, at 5th gear. Car completely stock engine wise, still 5000km, so hopefully it will get stronger as it grows older .

Max. power: 109.5kw (146.84HP)
Max. torque: 349.7Nm

Don't have the AFR data.

staticlag

Check your trailing sparkplugs and coils.

Black-8

Can you explain why please?

TimzSI

depending upon year and model, some of the spark plugs and the coils go bad. In the states, Mazda has issued recalls and TSB's to replace them, in many cases.

Black-8

Thanks, I just had the recall done on my car, they replaced 2 of my spark plugs. I'll try to put it on dyno again since now I got a new exhaust :D

shaunv74

^^Also post with RPM on the x axis if possible instead of speed. Also specify which gear you are dynoing in.

Good luck!

The Ace

I dynoed my 8 again, on a DynaPack this time, because I wanted to make sure that I indeed have a VERY rich A/F. Here are the results:







Anyone have any ideas WTF is going on with my car ? I have the REVi + ramair, and the Trust PE Ti exhaust. Could it be the cat, the MAF, something else ? The car gets generally bad mileage (yes, even worse than a "normal" RX8)...

Brettus

iTrader: (2)

looks fairly normal .
Bad mileage occurs when running rich at cruise not WOT so this chart does not help determine the cause .

The Ace

11,7 sounds normal ? This came from the wide-band at the dyno, but I'm also seeing 11,2-11 with the sCANanalyser, and the car generally eats up gas like there is no tomorrow. I have never gotten more than 350km (220miles) on a full tank, and you can even smell gas coming out of the exhaust...

If nothing else, the REVi and the Trust shouldn't have made the air-flow worse than stock, right ?

And when I was at the dyno, we compared my plot to a couple of other 4port RX8s, and they all had 13:1-12,5:1 A/Fs. That's a 10% difference, coming right at the RPM range where -in theory- I should be seeing max HP figures. My 8 is the only one that doesn't get max HP at around 7300rpm but rather close to 5500rpm, since it's choke-full of gas in the higher rpms...

Anyone has any ideas what I should be checking during my next visit at the dealer ?

rotaryPilot

^
Have you checked your ignition coils?

Here is a procedure of checking them
http://www.finishlineperformance.com...16-07-1793.pdf

File moy to Savvato hsoun sto Mavro Lithari gia mpanio me 2 gynaikes?

The Ace

Coils ? Nope. Why should I ? How would they affect the A/F ? Bad ignition cycle maybe ? Probably I'll let the guys at Mazda have a look at them.....

Hmoun, alla pws me gnwrises ? Ektos kai an hsoyn kapoy konta moy....

lepichichi

iTrader: (10)

so im in philadelphia, and i was wondering if anybody knows where can i take my car to get it dyno??????????

Jedi54

iTrader: (7)

holy crap, how did I not see this thread before??? I've got a contribution for this thread...gimme a minute.

Jedi54

iTrader: (7)

Here's the results for today's Meet / Dyno Runs. 18 N/A's and 1 Greddy Turbo all showed off their stuff on the dyno.


Summary of the highest HP numbers:
Peterisurhero - 200.600 whp!!!
Razz1 - 198.440
NgoRX8 - 196.840
Newcastle - 194.540
XdeedubbX - 190.890
Jedi54 - 190.290

Name Horsepower Torque

Peterisurhero - Run #1 200.600 140.930
Peterisurhero - Run #2 198.490 140.040
Peterisurhero - Run #3 199.620 140.450
Peterisurhero's Average 199.570 140.473





Name Horsepower Torque
BrGreen - Run #1 147.740 132.550
BrGreen - Run #2 149.280 132.610
BrGreen - Run #3 148.560 132.820
BrGreen's Average 148.527 132.660






Name Horsepower Torque
Snowflake - Run #1 174.920 129.000
Snowflake - Run #2 171.230 129.000
Snowflake - Run #3 169.070 131.000
Snowflake's Average 171.740 129.667







Name Horsepower Torque
Wing5 - Run #1 177.520 129.130
Wing5 - Run #2 176.010 129.130
Wing5 - Run #3 178.560 129.130
Wing5's Average 177.363 129.130







Name Horsepower Torque
Kwescott - Run #1 183.740 100.310
Kwescott - Run #2 184.110 137.190
Kwescott - Run #3 184.810 131.670
Kwescott's Average 184.220 123.057







Name Horsepower Torque
Scremin 8 - Run #1 173.970 136.100
Scremin 8 - Run #2 184.520 134.090
Scremin 8 - Run #3 184.500 133.850
Scremin 8's Average 180.997 134.680







Name Horsepower Torque
Newcastle - Run #1 194.540 134.830
NewCastle - Run #2 194.170 135.810
NewCastle - Run #3 192.360 131.020
NewCastle's Average 193.690 133.887







Name Horsepower Torque
Murix - Run #1 180.340 126.420
Murix - Run #2 185.430 131.200
Murix - Run #3 184.450 130.450
Murix's Average 183.407 129.357








Name Horsepower Torque
Rotary Rasp - Run #1 183.870 133.560
Rotary Rasp - Run #2 184.060 131.860
Rotary Rasp - Run #3 186.410 131.560
Rotary Rasp's Average 184.780 132.327

Jedi54

iTrader: (7)

Name Horsepower Torque
Jedi54 - Run #1 190.290 133.830
Jedi54 - Run #2 187.150 132.590
Jedi54 - Run #3 188.110 130.710
Jedi54's Average 188.517 132.377








Name Horsepower Torque
RX Ocho - Run #1 166.030 125.060
RX Ocho - Run #2 175.540 123.160
RX Ocho - Run #3 169.540 121.950
RX Ocho's Average 170.370 123.390







Name Horsepower Torque
NgoRX8 - Run #1 196.840 137.450
NgoRX8 - Run #2 193.790 135.220
NgoRX8 - Run #3 192.810 130.280
NgoRX8's Average 194.480 134.317







Name Horsepower Torque
xdeedubbx - Run #1 190.890 143.000
xdeedubbx - Run #2 186.690 139.000
xdeedubbx - Run #3 183.390 134.920
xdeedubbx's Average 186.990 138.973








Name Horsepower Torque
Jordanjerone - Run #1 141.570 141.890
Jordanjerone - Run #2 143.730 131.540
Jordanjerone - Run #3 145.040 131.640
Jordanjerone's Average 143.447 135.023







Name Horsepower Torque
Cesaralaniz - Run #1 183.090 138.470
Cesaralaniz - Run #2 187.660 129.350
Cesaralaniz - Run #3 187.900 134.060
Cesaralaniz's Average 186.217 133.960








Name Horsepower Torque
Razz1 - Run #1 197.860
Razz1 - Run #2 197.660
Razz1 - Run #3 198.440
Razz1's Average 197.987 #DIV/0!









Name Horsepower Torque
Bao0518 - Run #1 170.010 138.200
Bao0518 - Run #2 176.680 128.670
Bao0518 - Run #3 175.900 129.590
Bao0518's Average 174.197 132.153








Name Horsepower Torque
Sopheak - Run #1 184.220 128.610
Sopheak - Run #2 186.280 130.990
Sopheak - Run #3 185.570 130.110
Sopheak's Average 185.357 129.903








Name Horsepower Torque
Sammy - Run #1 265.010 193.770
Sammy - Run #2 272.560 226.840
Sammy - Run #3 280.400 224.510
Sammy's Average 272.657 215.040

Jedi54

iTrader: (7)

5 Top Cars vs Bone Stock RX-8
(these are corrected #'s)

Brettus

iTrader: (2)

Your A/F and fuel consumption seem normal to me . Had a quick look around but could not find another chart to show you to confirm this .
There are some threads here on what to look for if your consumption is really bad .
One thing that springs to mind is to check your MAF is clean . Thread on how to clean that is here also .

shaunv74

This is from kristopher_d when we did a dyno day this past winter. His car is bone stock...both runs

I love this one...

rotaryPilot

Yes bad ignition cycle. I have read before a guy with bad coils making the highest power at 5500rpm and past that rpm no power increase. Anyway you can ask the dealer just to measure your coils with the procedure I have posted earlier. If the measurement is ok, then you forget the coils as the cause of your problem.

Pesases apo mprosta mou sto Mavro Lithari. Apla epeidh den exoume milhsei pote kai se eida oti epsaxnes xaplostres den hthela na se stamathsw kai na arxisoume shzhthsh gnwrimias ktl Tha ta poume omws ean phgaineis syxna ekei giati egw menw ekei konta.

SRrx-8JC

iTrader: (9)

Hey guys I am not real sure where to ask this question, and I am getting my car dyno'd tomorrow. What do I have to turn off in order for the dyno to read correctly. Is is the DSC button. If anyone could let me know that would be great.