Go Back   Rotary Car Club > Tech Discussion > RX-7 3rd Gen Specific (1993-2002)

RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections.

Reply
 
Thread Tools Display Modes
Old 03-17-2009, 09:35 AM   #16
dfoster154
Boost Addict
 
Join Date: Aug 2008
Location: Elgin IL
Posts: 13
Rep Power: 0
dfoster154 is on a distinguished road
Quote:
Originally Posted by sk8world View Post
I find these numbers close. I made 323 at 13-14psi (creep) on a old stock motor with basic bolt ons. And these numbers were on a dynodynamics unit but converted to dynojet numbers.
hmmm I just reread your post, based on the DynoDynamic to DynoJet conversion I would be looking at 320ish as well...

Maybe I do need to spend the $$ on AI and start running a water meth mix to get more.
dfoster154 is offline   Reply With Quote
Old 03-17-2009, 10:48 AM   #17
afterburn27
Rotary Fan in Training
 
Join Date: Feb 2008
Posts: 58
Rep Power: 18
afterburn27 is on a distinguished road
I think those numbers are reasonable as well. With 10 psi on bolt-ons, stock ports, stock fuel, RP mapped ECU, & stock seq. turbos I dyno'd 300whp uncorrected on a humid 95 degree day with NO FAN, lol heatsoak. The corrected number was 321whp, but the SAE correction isn't really accurate for turbocharged engines. (Dynojet numbers)

I ran at 14 psi occasionally and that car pulled like a raped ape up top. AFR's were solid, although I'm sure I was close to maxing out the injectors.

I never took the car to the track, but on the street I was able to easily run down a few low 12 second cars.
__________________
'93 RX-7 (GT3574 track toy)
'74 Triumph TR6 (weekend cruiser)
afterburn27 is offline   Reply With Quote
Old 03-17-2009, 02:20 PM   #18
sk8world
600rwhp club member.
 
Join Date: Mar 2008
Posts: 551
Rep Power: 18
sk8world is on a distinguished road
Thats the ticket... Go to the track and get a trap speed, that tells all..


I am trying to go back and find my stock twin dyno. It was 323 at around 13-14psi. Bottom line is stock twins are a blast to drive. I had mine going 7.8's in the 1/8th back 10yrs ago with just intake, exhaust, pettit IC and PFC computer.
__________________
6.? @ 11? drag pass

http://www.youtube.com/watch?v=9wfxT2RMr7c
sk8world is offline   Reply With Quote
Old 03-17-2009, 05:24 PM   #19
hades
Rotary Fanatic
 
Join Date: Mar 2008
Location: Freedom Land
Posts: 316
Rep Power: 17
hades will become famous soon enough
i assume everyone with full exhaust also port their wastegates and installed boost controllers?
__________________
This is going to tear
hades is offline   Reply With Quote
Old 03-17-2009, 09:42 PM   #20
dfoster154
Boost Addict
 
Join Date: Aug 2008
Location: Elgin IL
Posts: 13
Rep Power: 0
dfoster154 is on a distinguished road
My wastegate is stock, and I have boost controlled by the PFC through Injector Duty Cycle. In the cold temps boost will push 13.5 psi, but in 60degree + I typicall top out at 12.5psi
dfoster154 is offline   Reply With Quote
Old 03-18-2009, 11:57 AM   #21
albertomg
Rotary Fan in Training
 
Join Date: Feb 2008
Location: Bay Area CA
Posts: 91
Rep Power: 18
albertomg is on a distinguished road
Pretty cool. Would you happen to have a better view of the dyno plot? I'd like to see the low end of it as well.
__________________
93 Vintage Red R1
Power: Street Ported Motor, 99 Twins, V-mount, DP>SMB cat/MP> RB cat back, PFC, 1300cc secondaries, Fuel Pump, ACT clutch, RB lwfw, etc
Steve Kan tuned - 310rwhp at 10PSI
Suspension: Tripoint custom valved Koni + Ground Control coilovers, Eibach sway bars, SuperPro bushings, Corner Balanced and accurately aligned
Brakes: RacingBrake 4 corner BBK
SSR Integrale 17"x9" +45, Dunlop Star Specs 255/40
albertomg is offline   Reply With Quote
Old 03-18-2009, 01:09 PM   #22
Signal 2
Viable Fossil
 
Signal 2's Avatar
 
Join Date: Mar 2008
Location: Mid-West
Posts: 199
Rep Power: 18
Signal 2 is on a distinguished road
Quote:
Originally Posted by Doc-1 View Post
Okay had the old girl Dyno=ed last night
The car is stock except for the 3 inch exhaust but it has a high flow cat, air pump with a stock air box, has 99 spec twins running in stock configuration
Probably missed it, but I'm still confused. ^From this I assumed Doc was still on a stock ECU, but subsequent posts refer to his "tune" and the fact he has "99spec twins". So it is modified with a programable or reflashed ECU? And wouldn't 10 psi on 99 twins be the same as 10 psi on stock twins?

I'm not certain you'd get all that much of a challenge from the "other forum". I seem to remember some of the established guys there already mentioning serious gains to be made just with a DP, hi-flow cat and cat-back. Can't remember for sure, but the figure of 20 whp as being tossed around.
__________________
Jim
VR R1 FD
Signal 2 is offline   Reply With Quote
Old 03-18-2009, 01:22 PM   #23
dfoster154
Boost Addict
 
Join Date: Aug 2008
Location: Elgin IL
Posts: 13
Rep Power: 0
dfoster154 is on a distinguished road
Here is my car's dyno sheet from last may.
Attached Images
File Type: jpg dyno.jpg (39.9 KB, 24 views)
dfoster154 is offline   Reply With Quote
Old 03-24-2009, 02:45 PM   #24
the spyder
Rotary Fan in Training
 
Join Date: Jun 2008
Posts: 38
Rep Power: 0
the spyder is on a distinguished road
Interesting.

Im making 336whp on a 99 motor, twins, 93 PFC, full 3" exhaust, intakes, and stock intercooler. However I am maxing out my injectors, need to upgrade to a SMIC, and properly duct it. Looking for 360whp ish.
the spyder is offline   Reply With Quote
Old 04-08-2009, 03:34 PM   #25
Cp1
Rotary Fanatic
 
Cp1's Avatar
 
Join Date: Mar 2008
Location: Sask, Canada
Posts: 181
Rep Power: 18
Cp1 is on a distinguished road
Quote:
Originally Posted by Chadwick View Post
I would get 15 B.S. posts if I put this on the other forum; the reason for the good numbers are the 99 turbo's and a good tune. The abraded seals make them 10-15% more efficient at the same boost level. I can only guess that at some point some respected person on the other forum posted that the seals didn’t do anything and everyone jumped on the bandwagon, but I can tell you from experience that they do make a difference. I put down 315 rwhp at 10 psi, but my engine also has 9.7:1 compression rotors.

Dan
reduced clearances do indeed make a huge flow difference on turbos like rad fans. those 99 turbos flow a lot more air than stock because of those abraded seals. if anyone disagrees tell them to remove their radiator fan shroud and see how little air they move then!
__________________
Quote:
As the length of an online discussion nears infinity, the probability of a comparison involving Hitler or the Nazis approaches unity.
Quote:
Re-upholster your FD's console or anything else... ask me how! Thread: http://rotarycarclub.com/rotary_foru...ead.php?t=5157
Cp1 is offline   Reply With Quote
Old 04-08-2009, 06:59 PM   #26
Signal 2
Viable Fossil
 
Signal 2's Avatar
 
Join Date: Mar 2008
Location: Mid-West
Posts: 199
Rep Power: 18
Signal 2 is on a distinguished road
Quote:
Originally Posted by Cp1 View Post
reduced clearances do indeed make a huge flow difference on turbos like rad fans. those 99 turbos flow a lot more air than stock because of those abraded seals. if anyone disagrees tell them to remove their radiator fan shroud and see how little air they move then!
They're more efficient.....yes. Quicker spool...OK. But at a given pressure and at given intake temp...say stock boost levels.....10 psi is still 10 psi isn't it? No difference in max hp at the dyno. Or am I missing something?
__________________
Jim
VR R1 FD

Last edited by Signal 2; 04-08-2009 at 07:12 PM.
Signal 2 is offline   Reply With Quote
Old 04-09-2009, 08:20 AM   #27
SPICcnmFD
Rotary Fanatic
 
SPICcnmFD's Avatar
 
Join Date: Feb 2008
Location: B'ham, AL
Posts: 329
Rep Power: 18
SPICcnmFD is on a distinguished road
Not necessarily. If they flow better, then 10psi is more hp than the one that doesn't flow as good, which is why most singles make more hp at the same boost level as twins. Boost is just backed up flow that can't get through the engine.
__________________
1993 Rx-7 SM2 #11
At the local AutoX:
http://www.youtube.com/watch?v=9VOSQkkSLQs
Speed for Sale shootout 2007:
http://www.youtube.com/watch?v=JiqlyAkGmpg
A few laps at Barbers:
http://www.youtube.com/watch?v=6_h5q...x=0&playnext=1
SPICcnmFD is offline   Reply With Quote
Old 04-09-2009, 10:09 AM   #28
Chadwick
Rotary Fanatic
 
Chadwick's Avatar
 
Join Date: Feb 2008
Location: Smyrna, TN, USA
Posts: 239
Rep Power: 18
Chadwick is on a distinguished road
Also a more efficient turbo puts out less heat at the same pressure which will add to the HP gains.
__________________

93 RX7 BB (Race Car)
93 RX7 SSM (Soon to be IBM and a daily driver)
05 Silverado Z71
08 Mini Cooper
80 LS RX7 (for sale)
Chadwick is offline   Reply With Quote
Old 04-12-2009, 09:41 AM   #29
Doc-1
Rotary Fanatic
 
Doc-1's Avatar
 
Join Date: Feb 2008
Location: Madison Alabama
Posts: 115
Rep Power: 18
Doc-1 is on a distinguished road
The car has a y-pipe, exhaust with high flow cat, RB dual tip, down pipe, commander stand alone ecu, 99 spec turbo's, a careful rebuild on the engine, K&N air filter and Mazdaspeed inter-cooler. I expected about 300 HP to the rear wheels with this setup at 10 PSI and got 294, 12 PSI got me 314, about right. Intake is stock
Doc-1 is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:10 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Hosted by www.GotPlacement.com