FC3S Murray

Figured I would post this for Phil at Advanced Induction and for some more hard data pertaining to these specific heads

My car is a 1988 RX-7 with a 2004 GTO LS1. 2 years ago I completed the swap and made 425 rwhp and 417 rwtrq. Supporting mods were:

Engine:
2004 LS1(LS6 intake, and block) 32,574 miles,
TSP 228R 114LSA,
Katech rod bolts,
PAC 1518 springs,
TSP 7.400 hardened push rods,
241 cast heads,
Custom 4" intake and 4" SLP MAF with resistor removed,
ported/polished TB
1 3/4'' Longtubes
2.5" dual exhaust w/ flo-monster X- pipe.
Magnaflow 14616 mufflers
Tuned by Frost & by Brian R.


Drivetrain:
2002 F-body T-56
RAM lightweight aluminum flywheel
LS7 clutch
Factory Mazda Diff LSD, 4.10 ratio


Old Dyno Sheet:



OLD dyno vid:
[/SIZE]



-------------------HEAD SWAP-------------------

So this July I wanted to get some more power because I was bored and wanted to tinker. Heard of AI's results and wanted to keep this head swap$cheap$.

I ended up ordering Phil's 219cc High Compression "241" head option. I wanted factory deck height and retained a 60cc chamber size. This made my compression ratio 11:1.
I used the GM MLS head gasket.
I also had to upgrade to Ford 30lb injectors which were input in HP tuners as 34.5 lbs/hr @ my 57 psi rail pressure.

NO other changes were made

The results were: 476.6 RWHP & 430.4 RWTRQ

DYNO VID:

Dyno Sheet (in the works to get a revised copy emailed to me with matching HP and TRQ scales for better comparison reasons)



I am very pleased with the results! Phil and his shop does some amazing things with the 241 heads


Few pics of the RX:

NW Iowa WS6

iTrader: (9)

What kinda dyno is that? Excellent gain from the heads but both baseline and after heads numbers it seems like a very optimistic one. 430whp 417tq cam only with a very mild 228R is WAY above normal results.

NW Iowa WS6

iTrader: (9)

Beautiful car btw though! Love the engine bay!

455GTO

iTrader: (18)

Agreed on that^^

No doubt the heads make power as i have AI 226cc ls6 heads on my ls1 and made 455whp with a Torquer2 cam. I bet that RX7 flys! Just think thats a very happy dyno

FC3S Murray

Thanks for the compliments on the car.

It is a DynoCom 21,000 series. DynoComs are known to be very "torque happy". These are all corrected numbers too guys.

Remember, the dyno is just a tool for comparison reasons just like this very case with upgraded parts. I was fortunate enough to have access to the exact dyno used 2 years ago.

Once I get this thing down the 1/4 mile, we will see its true power.

newchevyman

iTrader: (15)

Beautiful car and excellent numbers. I will probably do AI 241 or 243s seeing all the threads about them. Look forward to track times!

Macs98Z

iTrader: (16)

So let's assume it's a happy dyno, which it seems to be. Still, 50hp gain from head porting alone is crazy! Assuming a stock headed 228 cam engine might make 390 rwhp on a more conservative dyno--this setup would be about 440 rwhp on a mild cam and no FAST--pretty good IMO.

yonerhottlt1

iTrader: (21)

That car is a thing of beauty...and nice results!

silverz28camaro

iTrader: (20)

Very nice results and GREAT job on that engine bay!!! CLEAN!.. And I agree the dyno is just a tool, your 1/4 mile results will be what I'll be looking forward to but I would expect to see some big MPH gains 4-6 is my best guess.

I am also surprised that your peak power on the first graph is un der 6K and after is right at 6K, Looking back at some of my old graphs my 224cam ls6 heads peaked right at 6,200

TrentSS

Those are great results! I continually hear nothing but good things about A.I. When the funds will allow you should throw a FAST 92 on her

Rise of the Phoenix

iTrader: (27)

Regardless whether the dyno reads high, it still shows a significant gain with the AI ported 241 heads. Where are all these "internet expects" at now that say you can't make good power with 241 heads. It's all about who does the port work and AI is one of the best. Beautiful car OP.

FC3S Murray

The power drop off up top is due to my 90 degree intake elbow......it is pretty common on the LS swaps (240's, E36's, ect) where we cant run a over-the-radiator intake set up. Air gets restricted & turbulent at higher rpm i guess. Some RX guys have done those OTR set ups but require hood and front crossmember fabrication.


THANKS every one for the kind words on the car. It has been a fun swap and the car is a damn rocket in street trim.

I will post my 1/4 mile time hopefully on Sunday. I am hitting the strip up here in Lewistown on the 28th. Elevation is 4200 feet but regardless I will see what she can do. My 60' foot will suffer because of my fragile diff but hopefully i can keep it below 1.9 lol

e30polak

Awesome car, with great power! LOVE the wheel choice!!!

Marc 85Z28

iTrader: (8)

You CAN make good power with 241 castings, but it won't be done with CNC, regardless of who programs it.

I watched a bone stock 2003 Mustang GT put down 255rwhp, and a CAI/Flowmaster catback/Lightning pulley/tune 03 Cobra put down 480rwhp on a Dynocom many years ago. IMO they're worthless.

FC3S Murray

Yep..... you must be right..... my engine just miraculously made 50 extra HP from the slightly WARMER air temp & LESS humidity last week compared to the 2 years before on the exact same dyno. Come on man!

AI's CNC work on the intake/exhaust ports and chambers are the VERY reason these heads made power.

As for what you have seen with the mustangs on a dynocom really isn't too hard to believe.

The 4.6L V8 from Ford has been dyno'ed mutiple times in stock trim and averages 245-255 rwhp.

An 03 Cobra with a tune, higher boost and breathing better is going to make substantially more power, hell look at what a good tune alone makes for power on a stock LS1/LS6. Now 480rwhp may be a bit high, especially if on a dynocom because everyone knows they are generous but that rwhp doesnt seem way out of line.

Yes dynocoms are a dyno-queen's favorite but if used consistently with the same car over the course of time with modifications, it is nothing more then a tool.

Marc 85Z28

iTrader: (8)

All I'm saying is that 241 heads won't make real world power like you've shown on a stock cube small cam build, period. They can perform, but as stated before, it requires a skilled hand, not a CNC.

No, they certainly don't. Perhaps you're thinking about bolt on cars, or a weak 4V car. The PI 4.6s are lucky to see 230 stock.

That kind of power NEVER happens on an untouched Eaton. NEVER.

Perhaps I should have mentioned that my car was also on that dyno... 3 months after having it on a local Mustang dyno, it "magically" made 32rwhp more. And if I remember right, my indicated peaks occurred several hundred RPM earlier than actual, so call me a skeptic. Inertia dynos make for poor tuning tools, and Dynocoms are just plain worthless.

Rise of the Phoenix

iTrader: (27)

Are you ******* serious with your reply? Did you not just read this thread. The OP had the car dynod on the same dyno, added AI ported 241's and gained nearly 50 HP. Maybe you need to get your head out of your *** and learn to read and do math. The OP is not the only one to have great results with AI 241 heads.

gtotoocool1

iTrader: (6)

Marc,a 50hp gain on an already cammed engine, with just a head swap,is definately possible. a CNC port comes from a hand ported one that has been digitized so the original port is replicated,for the most part.of course there's usually hand finishing involved,so i don't see your arguement.
do you port heads for a living?