Fresh dyno results after a round of quarantine mods and getting tuned at Church Auto in Socal. Highly recommend these guys!

Changes from last time when it made 468/451 on a dynojet:

Optimized intake tract and swapped to LS3 maf from LS2

1 7/8” merge collector headers into existing dual 2.5” xpipe exhaust

IGN1A smart coils With tr6ix plugs gapped up to .060” (more for the next big cam engine on e85)

Longer Summit HDR pushrods 7.450” length .120 wall 11/32 diameter (killer parts!). Ls7 lifters at 2-2.25 turns trying to make the cam act bigger.

LS3 rod mod intake by GPI - no porting just the mod

RPS BC2 Carbon clutch 30 pounds total - in love with this thing


Engine specs -

4.005 x 4.00” LS2 11.1:1 compression
Stock ls3 heads
Baby Comp cam 226/242 on 117+3.5 LSG lobes
Diamond pistons ceramic tops and coated skirts
Callies crank and rods
GPI rod mod LS3 intake
1 7/8” merge headers into 2.5” xpipe

Dyno video:


Wound up making 511/509 and really smoothed our the curve with the headers. Big midrange gains, and pulls higher before falling off although it still runs out of breath with such a small cam.

Stock c6z’s dyno 460whp at Church, and headers/intake/tune tend to be 500-505whp. Feeling great about the gains.

 

Love the mazda!! Attention to detail pays off

 

Thanks brother!! I was honestly not expecting a whole lot and came away very happy both with the tune, and how well the car runs with the new parts.

Very happy with stock ls3 heads on a 4" bore.

 

good numbers, great torque for a baby cam. Interesting choice in plugs. Probably some power to be gained stepping up from a 2.5" X also. Good stuff!

 

Pretty good man.

 

Congrats D
Excellent Gains.
Love those Last Gen RX7s.
One of my favorite cars, Especially with a LS.
First in line should you ever decide to sell.
LOL

 

Yeah I blew some money I probably didn't have to on the coils and the plugs, but it is more for the LS7 I'm building that'll be 12:1 (was planning higher but would've needed custom pistons and cheaped out) and I'm going to run it cold on E85. The cam will have 35* overlap so I'm hoping the big arc with a lot of energy behind it will keep the thing running somewhat smooth despite the reversion due to the overlap. The smart coils will fire off a 3mS continuous spark which is pretty sweet and should really help with igniting a diluted mixture.

I will say though part throttle and idle this engine has never been happier. Idle is rock solid at 850 and the car doesn't shake anymore due to idle correction kicking in.

I think dual 3" would pick up a chunk, and definitely would with the bigger 427. It is hard to package dual 3" in the rx7 and not bang it off the ground. The headers are touching on speed bumps as it is. Dual 3" would hang low enough to scrape on driveways in the center I'm worried. There's not much room in the tunnel width wise to run oval tubing either. It's been done with dual 3", and definitely with big 4" single exhaust, but the sound of dual exhaust is so much nicer. I think for the LS7 I'll look to increase the size of the X-pipe to a 3" in and step it down to 2.5" on the outlet. That would give the exhaust more room to mingle and hopefully cool down a bit when it expands in the larger volume. As the gas expands it doesn't require as large of exhaust diameter. At the collectors and the first 18-24" is the most critical for flow. My mufflers are straight through 2.5", and the exhaust is all hand tigged mandrel bent 2.5" it flows really well obviously.

Thanks man! There's more than a few people that would fight you for it but I'm not sure they'd fight with cash, more just calling dibs haha! I've never kept any other car beyond 2 years and I think I'm at 11 years ownership with this thing now. It gets more expensive to own every year LOL things are definitely getting out of hand.

 

I bet that lil car scoots. Light em up!

 

It does! Took some video last night.

https://youtu.be/eb7xar-1QXM

The dyno operator said it was running 12.5 on the dyno with a tailpipe O2, but in my datalogs I'm seeing average ~11.5. I need to make a pull and watch the gauge to see if my sensor calibration is off in HPTuners...otherwise I'm not too sure what the best thing to do is. I would be shocked if the tailpipe and the header pipe would have a 1 AFR difference.

The fueling is consistent, and flat. It does the same in every gear every time.

 

Did they actually get it up in the tailpipe or just let it sit at the tip? That can make a 1 point difference.

 

They use a pipe like this

 

That's an interesting contraption. I usually try to slide it up in the tailpipe a couple feet to keep it away from oxygen that will cause a false lean during tuning....which will make it run overly rich post tuning.

 

Awesome video. Car runs and sounds great. Probably a blast to drive.

 

I want to go for a ride.

 

Very impressive!

KW