RX8 Dyno

WE3RX7 · 08-31-2009, 09:49 PM

So I finally got some base line numbers on the 8 this past Sat at KDR. Went up there to meet Brian and his FC again and to hang out w/ Dave and see what the shop was all about.

I was pleased with the numbers for a stock RX8 as compared to what I've seen throughout the interweb.

Specs:
2004 w/ 52K on the clock
K&N Drop in
Redline Rear Diff fluid
38psi in all tires
Racing beat wires and brand new NGK plugs

Future plans are to lean out that nasty fuel dump over 7k, add a new clutch (started to slip a little at 7K in 4th), lighter flywheel, headers, AP tuner and some new suspension.

My goal is 200 corrected whp... I think I can get it.

WE3RX7 · 08-31-2009, 10:32 PM

More shots from the dyno, nothing special

***TitaniumTT*** · 08-31-2009, 11:30 PM

I was hoping you would make this thread. She handled the abuse like a champ, esp that long 18 sec pull. I think you can get there Bill. What did Dave say about gains by leaning out that pig rich @>7k? I think most of the gains can be had there. Does the software allow for any ignition adjustments?

reddozen · 09-01-2009, 09:24 AM

Just making sure, you did pull the ABS fuse right?
From what I've read it's important to do so in order to get a proper dyno read.

200 should be doable without engine mods. I can't wait to get my bridge ported rene back and see what numbers it will put down before I turbo it...

Kane · 09-01-2009, 05:41 PM

200 with tuning only is doable.

WE3RX7 · 09-01-2009, 07:48 PM

We didnt pull the ABS fuse, but disabled the ABS/DSC system all together. She was accurate alright, lol.

Dave definitely thinks leaning those curves out will pick up a few extra... like you said, the gains will be all up top. He didnt really give numbers, but probably looking at 4 to 5 at around 8000 and up at least... maybe more. I'll need to get an AP tuner and find out. I'm thinking of getting one before any other mods now actually (other than some planned aero and suspension mods).

Those 18 second pulls were great! I think it did the car good, I took her to 95mph today on a quick run and it pulled better than it has before, but than again - I did just do the RB wires and new plugs too...

MIKES'8 · 11-05-2009, 02:25 PM

i pulled 211 rwhp with these mods no tune.
mods:k&n intake, custom header, turbo xs headerback exhaust, mazsport coils, mazsport fan mod, rb air duct, rb flywheel, throttle body pp ,tb bypass, exedy stage 2 racing clutch, ap pulley,sprint springs, mazdaspeed front strut tower bar and rear trunk bar,custom oil catch can,af sts, shine front lip,evor rear cf trunk spoiler, rx8strakes window visors, mazda piano blk side pillars, piano blk eyelids,rota d2 18x8 and 18x9 +5 et all

im trying to hit the drag strip soon and break 13s with some street slicks, keep you guys updated.

MIKES'8 · 11-05-2009, 02:30 PM

your biggest gain will come from your header and exhaust setup.

ganseg · 11-13-2009, 11:24 PM

I want to have my car dyno'd (stock 2004 with 35k). WOndering if one type of dyno is better than another for a low torque, high redline car. I am in the Minneapolis area and i think there are two or three choices of shops here.

WE3RX7 · 11-14-2009, 09:53 AM

Typically the dynojets will yield slightly higher numbers than a mustang dyno. Some people say tuning on a mustang dyno is better and more accurate.

The more important factor IMHO is that you use the same dyno throughout the build. This way you know your gains are accurate even if the equipment isnt and your not introducing a different variable into your tuning.

Also, find a good shop. I have dealt with some pretty bad dyno shops and it took a while to find one I liked and trusted.

ganseg · 11-14-2009, 10:01 AM

Would anyone say the RX-8 poses any special requirements for a dyno? THe reason I ask is because I would think the rotary would have a harder time spinning up the drum (low torque) and then showing its best at the high RPM when the HP comes on. I have also noted bigger than expected differences between stock engines - peaking at 8000 rpm vs still pulling when the throttle is cut.

I am hoping to dyno it before mods and then dyno each change - probably engine management first.

WE3RX7 · 11-14-2009, 10:08 AM

Rotary cars may not have a lot of torque but they'll spin the drums just fine. The operator of the dyno will need to disengage the ABS/DSC system though as that can fight the drums during operation.

ganseg · 11-14-2009, 10:20 AM

I have a 2004 base model, so I don't think I need to disable anything?

reddozen · 11-14-2009, 06:07 PM

Quote:

Originally Posted by ganseg

I have a 2004 base model, so I don't think I need to disable anything?

You'll still need to disable the ABS as far as I know. It's just as easy as pulling a fuse under the hood though... nothing hard.

Renesisking · 11-26-2009, 11:49 PM

pulling the abs fuse didnt do much for me, i just had to deactivate the DSC and traction control, otherwise you are fine to dyno

08-31-2009, 09:49 PM	#1
WE3RX7 RCC Addict Join Date: Feb 2008 Location: VA Posts: 1,812 Rep Power: 19	RX8 Dyno So I finally got some base line numbers on the 8 this past Sat at KDR. Went up there to meet Brian and his FC again and to hang out w/ Dave and see what the shop was all about. I was pleased with the numbers for a stock RX8 as compared to what I've seen throughout the interweb. Specs: 2004 w/ 52K on the clock K&N Drop in Redline Rear Diff fluid 38psi in all tires Racing beat wires and brand new NGK plugs Future plans are to lean out that nasty fuel dump over 7k, add a new clutch (started to slip a little at 7K in 4th), lighter flywheel, headers, AP tuner and some new suspension. My goal is 200 corrected whp... I think I can get it.

08-31-2009, 11:30 PM	#3
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son Posts: 4,581 Rep Power: 10	I was hoping you would make this thread. She handled the abuse like a champ, esp that long 18 sec pull. I think you can get there Bill. What did Dave say about gains by leaning out that pig rich @>7k? I think most of the gains can be had there. Does the software allow for any ignition adjustments? __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

09-01-2009, 09:24 AM	#4
reddozen Gold Wheels FTW Join Date: Mar 2008 Posts: 744 Rep Power: 18	Just making sure, you did pull the ABS fuse right? From what I've read it's important to do so in order to get a proper dyno read. 200 should be doable without engine mods. I can't wait to get my bridge ported rene back and see what numbers it will put down before I turbo it... __________________ My Cars: 1974 RX4 Coupe 1991 FC3S RX7 - Sold 2003 ZZW30 MR2 (Rotary swap after RX8) 2004 SE3P RX8 (20B Swap in the works)

09-01-2009, 05:41 PM	#5
Kane All about the O2 Join Date: Sep 2008 Posts: 295 Rep Power: 17	200 with tuning only is doable. __________________ My 2007 Turbocharged RX8

11-05-2009, 02:25 PM	#7
MIKES'8 The Newbie Join Date: Nov 2009 Location: SF to LV Posts: 20 Rep Power: 0	i pulled 211 rwhp with these mods no tune. mods:k&n intake, custom header, turbo xs headerback exhaust, mazsport coils, mazsport fan mod, rb air duct, rb flywheel, throttle body pp ,tb bypass, exedy stage 2 racing clutch, ap pulley,sprint springs, mazdaspeed front strut tower bar and rear trunk bar,custom oil catch can,af sts, shine front lip,evor rear cf trunk spoiler, rx8strakes window visors, mazda piano blk side pillars, piano blk eyelids,rota d2 18x8 and 18x9 +5 et all im trying to hit the drag strip soon and break 13s with some street slicks, keep you guys updated. __________________ 2005 MAZDA RX8-THE WEEKEND WARRIOR 2008 MAZDA CX7-THE FAMILY RIDE 1994 MAZDA MIATA-THE CLASSIC(36K ORG MILES) 1992 MAZDA 929-THE VIP PROJECT 1989 MAZDA MX6-THE DAILY Last edited by MIKES'8; 11-07-2009 at 02:44 AM.

08-31-2009, 10:32 PM	#2
WE3RX7 RCC Addict Join Date: Feb 2008 Location: VA Posts: 1,812 Rep Power: 19	More shots from the dyno, nothing special

09-01-2009, 07:48 PM	#6
WE3RX7 RCC Addict Join Date: Feb 2008 Location: VA Posts: 1,812 Rep Power: 19	We didnt pull the ABS fuse, but disabled the ABS/DSC system all together. She was accurate alright, lol. Dave definitely thinks leaning those curves out will pick up a few extra... like you said, the gains will be all up top. He didnt really give numbers, but probably looking at 4 to 5 at around 8000 and up at least... maybe more. I'll need to get an AP tuner and find out. I'm thinking of getting one before any other mods now actually (other than some planned aero and suspension mods). Those 18 second pulls were great! I think it did the car good, I took her to 95mph today on a quick run and it pulled better than it has before, but than again - I did just do the RB wires and new plugs too...

11-05-2009, 02:30 PM	#8
MIKES'8 The Newbie Join Date: Nov 2009 Location: SF to LV Posts: 20 Rep Power: 0	your biggest gain will come from your header and exhaust setup. __________________ 2005 MAZDA RX8-THE WEEKEND WARRIOR 2008 MAZDA CX7-THE FAMILY RIDE 1994 MAZDA MIATA-THE CLASSIC(36K ORG MILES) 1992 MAZDA 929-THE VIP PROJECT 1989 MAZDA MX6-THE DAILY

11-13-2009, 11:24 PM	#9
ganseg The Newbie Join Date: Nov 2009 Posts: 3 Rep Power: 0	I want to have my car dyno'd (stock 2004 with 35k). WOndering if one type of dyno is better than another for a low torque, high redline car. I am in the Minneapolis area and i think there are two or three choices of shops here.

11-14-2009, 09:53 AM	#10
WE3RX7 RCC Addict Join Date: Feb 2008 Location: VA Posts: 1,812 Rep Power: 19	Typically the dynojets will yield slightly higher numbers than a mustang dyno. Some people say tuning on a mustang dyno is better and more accurate. The more important factor IMHO is that you use the same dyno throughout the build. This way you know your gains are accurate even if the equipment isnt and your not introducing a different variable into your tuning. Also, find a good shop. I have dealt with some pretty bad dyno shops and it took a while to find one I liked and trusted.

11-14-2009, 10:01 AM	#11
ganseg The Newbie Join Date: Nov 2009 Posts: 3 Rep Power: 0	Would anyone say the RX-8 poses any special requirements for a dyno? THe reason I ask is because I would think the rotary would have a harder time spinning up the drum (low torque) and then showing its best at the high RPM when the HP comes on. I have also noted bigger than expected differences between stock engines - peaking at 8000 rpm vs still pulling when the throttle is cut. I am hoping to dyno it before mods and then dyno each change - probably engine management first.

11-14-2009, 10:08 AM	#12
WE3RX7 RCC Addict Join Date: Feb 2008 Location: VA Posts: 1,812 Rep Power: 19	Rotary cars may not have a lot of torque but they'll spin the drums just fine. The operator of the dyno will need to disengage the ABS/DSC system though as that can fight the drums during operation.

11-14-2009, 10:20 AM	#13
ganseg The Newbie Join Date: Nov 2009 Posts: 3 Rep Power: 0	I have a 2004 base model, so I don't think I need to disable anything?

11-26-2009, 11:49 PM	#15
Renesisking Rotary Fan in Training Join Date: May 2009 Location: Connecticut Posts: 39 Rep Power: 0	pulling the abs fuse didnt do much for me, i just had to deactivate the DSC and traction control, otherwise you are fine to dyno __________________ 2004 RX-8. I would love to tune it but can't find the right parts for Microtech