2713ddddavid

iTrader: (1)

I developed a miss after having a good day at the track. I changed plugs but still had the miss. (I only use NGK Platinums) I went back to the track and once there I put in all trailing plugs in both the leading and trailing holes. Car still ran odd and the miss was still there.
I had a Mazda dealer I trust run a compression test with there big money tester
the numbers are below

Front 7/5/4

Rear 8/6/6

Any thoughts?

2713ddddavid

iTrader: (1)

I had the chance today to dyno my car.
Company only works on / modifies Ford products, but since I only wanted to see where I'm at with mods I have and the low compression numbers posted above, they were more than happy to take my money.
The car gave three near exact pulls results are 276hp/221tq 281hp/224tq
273hp/222tq at the rear wheels. A:F stayed almost dead level at 11.4/11.5 from 3500rpms to end of pull. My boost controller was set to give about 12psi. The
guy actually running the car would let off at between 6500 and 7000 rpms
This was done on a Dynomax dyno and their wide band was consistent with my LC1's Gauge in the car.

Mods on the car are listed below.

MY88T2 1988 Mazda RX7 Turbo 2 FC3S S4 "Zenki"
Kuhmo 225 x 50 x 16 on Enkie 9 spoke wheels
Racingbeat T2 turbo back exhaust
K&N cone filter
Stock top mount intercooler
BNR Stage 2 S5 Turbo on Stock S5 Manifold
Miata Short Shifter
ACT 6 Puck Unsprung Clutch Pressure Plate
R-Tek 1.8 ECU Upgrade
New 750cc RC Engineering High Z Injectors Primary and Secondary
Innovate Technologies LC1 Wideband O2 Sensor
Autometerboost Gauge in A Pillar Pod
DB Air:Fuel Gauge on LC1 in A-Pillar Pod
KYB-AGX Struts
Eibach Pro Kit Variable Rate Springs
Custom Stainless Radio/Gauge Face
Autometer water temp / oil pressure / volts
Pioneer Radio / CD / MP3
S5 Tail Light Assemblies
Removed Emissions
Simplified Vacuum Layout
Electric Fan From Ford Tempo on With Key Through Relay
New Standard Brake Pads and Rotors Semi Metalic Front / Organic Rear
DTSS Eliminator Bushings

I'll post the dyno sheet as well as the compression test results sheet when I get the chance. At the moment I can't even see my scanner let alone use it there is so much **** piled on my desk.
What do you guys think overall considering the two low compression numbers on the front rotor, pray its carbon causing the trouble start with a good water bath or take the advise given to me by the old mazda mechanic and use ATF and let it sit over night to see if that clears up the miss and tendency to want to flood. All these problems(missing and easy flooding) started after my best run of 12.8sec. 108mph
I was so low on gas I felt the car stumble just as I past the finish line. This was almost a month ago that the stumble happened, my last trip last weekend It was difficult to get even get into the 13's .

texFCturboII

iTrader: (17)

wow, you've got a stage two BNR and are only pulling 273 rwhp? does that sound low to anyone else? with those mods I would expect at least 300+

evileagle

iTrader: (1)

No, for a stage two that's about right for RWHP.

2713ddddavid

iTrader: (1)

I will post both the dyno sheet and the mazda compression test sheet in a bit.
My goal was 300 or so rwhp.I want to maintain reliability with enough pony's to keep the ricer mouths closed around my area. I`m not out to try and beat Detroit muscle either but just enough to get the respect a rear wheel drive two seater deserves.

Rotard4life

with the low gas drag and stumble...what it sounds like is that you are the victim of tank surge, which caused detonation and fubard a Apex seal.

One Seal gone would also explain why you get two low and one High compression on your Front rotor...
And don't do the ATF "trick", take anything covered in carbon, and soak it in ATF...it doesn't do anything. and I believe when ATF burns it becoms very caustic and can damage/wear internals.

Phone a well known and experienced Rotary builder in your area and give him what you gave us, because it sounds like its popped.

2713ddddavid

iTrader: (1)

I live in Detroit so the import crowd is thin, the "rotary mechanics" are not to be found, at least not close by. I"ll get on the phone and make some calls out and
about.

2713ddddavid

iTrader: (1)

Here is a link to my compression test on Oct. 2 and my Dynomax results on Oct. 6

https://www.rx7club.com/showthread.p...59#post7401959