I recently purchased an 87 turbo 2 and while i was driving it hard, I heard a loud pop when i shifted gears between 2nd to third? I know what a BOV sounds like so im ruling that out. I wonder if its possible that it was a misfire? I would shift around 6500-7k when id hear the loud pop? Any advice would be greatly appreciated.

 

Sounds like a backfire. Pretty common in an RX7, since they're usually tuned to run rich to avoid engine detonation. A list of mods would be helpful to see if the previous owner would have a reason to tune it rich (e.g. if he installed a free flowing exhaust, like a test pipe and a cat-less/catback exhaust) and what ECU/EMS you're running on it.

 

here are all the mods:

Exterior:
BMW alpine white paint
Shine Auto RMagic side skirts and rear ad on
Foresight front fenders and rear over fenders
AIT front bumper
JRX wangan wing
Custom molded fender, side skirts, and rear bumper
Carbon roof panel ( smoked )
APP 6000k hid kit
S5 round taillights
Led bulbs (all)
All new weather stripping and exterior pieces
Medium tint all around

Suspension/Brakes/Handling:
Stance GR+Pro coilovers f-12 r-12
Racing beat front and rear sway bars
Energy polyurethane complete bushing kit
Ronin tow hook
All new mazdacomp bushings (engine, trans, front and rear diff )
Mazdatrix camber adjuster
AWR rear control arm camber adjusters
Wilwood SL 4 pistons calipers and custom brackets w/ 13 inch rotors
Rear slotted rotors
Endless SS brake pads
Earls SS brake lines
Motul brake oil
Autopower 4 point roll bar
Cusco side bars
Custom powder coated front sub frame matte textured black
Powder coated candy purple lower control arms, sway bars, Autopower 4 point roll bar, Cusco side bars

Wheels/Tires:
Sponsored by SSR Wheels
SSR Professor MS1 titan silver center with black bolts and custom black anodized inner and outer barrels
Front 18×9, Rear 18×10.5
Falken Fk-452 front 225/35/18 rear 255/30/18
Muteki black lug nuts

Interior:
Recaro Pole Position leather racing seats with grey alcantar inserts
Bride seat brackets
Nardi racing steering wheel
MoonFace shift ****
Carbon center console 3 gauge holder
Haltech racepak IQ3
HKS turbo timer
AEM digital gauges (fuel press, water and oil temp)
Greddy Touch – A/F aem sender, boost, fuel pressure, volts etc.

I.C.E.:
Clarion VX401 multimedia station with 6.2 hi resolution touch panel control

Automotive Performance:
Rotary Power street port 13bt
Garret GT30R BB turbo
ARC intercooler kit
HKS cast manifold
Tial 44mm wastegate
Polished JDM upper and lower intake manifolds
Exedy stage 1 clutch kit
Racing beat lightened flywheel
Earls SS oil and coolant turbo lines and fittings
Modified and sleeved main engine harness (air pump deleted)
Haltech P1000 sport ecu, harness, and boost solenoid
Tunned by Nelson at RRR 350 hp and 275 torque @12 psi
Gm 3bar map sensor
Dynamic injectors x4 1000cc
AEM Water Injection kit
Cosmo Denso in tank fuel pump
SS -6 fuel lines and fittings
Banzai Racing fuel rail kit
Racing Beat turbo back REV T2 exhaust
Koyo radiator
Blitz BOV
Optima Yellow top battery
Corksports oil cooler lines and fan shroud
Steel braided lines and fittings
Custom Earls power steering cooler and lines
Mazda competition 10 spark plugs
Mazdatrix spark plug wires
Mazdatrix short shifter
Mazdatrix oil cap
Chrome rotary oil dip stick
SS allen bolts and anodized purple washers
Idemetsu 10/30 synthetic racing oil and fuel premix
Engine bay painted red purple pearl
Powder coated candy purple engine bay pieces
Polished and chromed engine pieces

 

^Now that's a mod list!!! You got an awesome car!

The cat-less exhaust and removed anti-afterburn features cause it to run rich when you lift off the throttle. Backfiring isn't a problem, that's just how it works. If don't want to make the noise, let off the throttle slower or don't accelerate as hard right before the shift.

 

Thanks. So in otherwords, if i drive it hard and hear that pop, i dont have anything to worry about. Im a serious noob with these cars, what is "removed anti-afterburn"

 

Half the fun of an RX-7 is shooting fireballs out the exhaust. Not many other cars will do it so readily. Mazda installed a anti-afterburn valve in the exhaust manifold of the RX-7, to prevent unburnt fuel from being ignited in the tail pipe. This feature is restrictive, and robs performance so most aftermarket exhaust remove this feature.

 

Yup. It's normal. And cool!

"Anti-afterburn" is a feature built into stock throttle bodies to prevent backfiring/afterburn. It just limits how fast the throttle can be closed. You can do the same thing by releasing the throttle a little more gradually.

 

Is this the RSpec FC?

http://www.superstreetonline.com/fea...7/viewall.html

I know he was selling it on here for a super good deal for what it is.

 

yup, its the same one.

 

ummm wow....

Yeah.. with these turbos.... and those mods.. your probbly pretty rich.. which is normal.... gezz.... (i thought my new steering wheel was cool

 

I was trying to warm my car up today, and my neighbor came over and complained and said i was killing his children with my fumes. I didnt know what to say.

 

I think it's time to dump a bunch of oil in the combustion chambers, then warm it up in front of his house.

 

LOL!!!

 

He's killing his children with negative energy. He should get behind the wheel of one of these

 

Tell him that he can get employment as a Eco-tech,as the bullshit coming out of his mouth can power up a Prius!

 

hahaha, agreed!