Pretty good numbers on an FM2/MS
 

305 with the final tune. Stock internals, US intake, cheap JDM '99 motor with the BP5A intake cam. GT2560R, FM2 everything else. LS3 coils, EBC solenoid. 2.5" exhaust, no cat or muffler. 7psi at launch. Big thanks to Ben and Russ at DIYAutoTune, they really know their stuff.

Attachment 235108

They also made a trick ST2 tune:

Attachment 235109

The boost climbing back up is creep because unported wastegate. They pulled timing and added fuel to keep the power down.

For fun events, we'll be running the solid 260whp tune (I don't have a dyno plot yet for that one.)

The car:
https://scontent-a-mia.xx.fbcdn.net/...23&oe=54AB9E24

Attachment 235110

I have been told to expect haters. :fael:

that is a glorious powerband, and great power for a 2560, and better yet you have it all in the coolest package ever, exocet :party:

I don't think you'll get any hate. It all looks great.

305 with stock internals... ? Mhhh, in before hole in block. ;-)

That thing must be a freakin rocket...geez. What does it weigh?

The ONLY hate you will get from anyone on here is why would you not at least spend $400 and put a good set of rods in that thing. Other than that.....AWESOME!!!!!

Maybe i missed it, 305hp at what boost pressure? 260hp is at 16? E85?

That's about my goal, though i have a pretty heavily built engine.

Id bet it wont throw a rod. Theres MUCH less load on that motor in the exocet and with a good tune on e85 the factory bp4w could likely hold that even in a miata.
Looks like an amazing setup, id love to get one for myself later down the road.

Did you not see the torque numbers?

It's a research vehicle. We want to see how far we can go with stock internals so we can tell our customers: "hey, don't run 280rwt".

With a full tank of gas, this guy weighs about 1530.

very very cool.

so you're doing it........for SCIENCE :party:

Oh... i realized that you're Warren. :giggle:

You're the good kind of crazy.

- Swank Force One.

Looks like the lack of muffler and cat really wakes the 2560 up!

How loud is it? :)

--Ian

Hey guys. I went to pick up the car from DIY tonight, and they convinced me to go up to Atlanta Dragway and set some times. If any of you are in the area and want to see it blow up, see you tonight!

This thread just keeps getting better :party:

in for ice rink drag strip.

Pressure & fuel type?

I check the grassroots thread every day. Sooooo want an Exocet.

I saw 20psi to get that 305hp on Facebook. That's some rediculous torque you got there.

1/4 mile times should be entertaining!

Two big crashes shut the event down while we were waiting in line. Here's some gratuitous rubber burning instead.

Exomotive Exocet XP-4 305hp tune:

Thanks to the Exomotive crew; especially Warren, Kevin, and Tyler. We pushed this one to the limit.

Pump 93 with NB style fuel system. I'm unsure of the fuel pump type, but assume it has whatever FM supplies with their mack-daddy fuel system kit. XP4 has pretty much the entire FM catalog.

Liek Warren said, multiple incidents on track prevented us from getting a single run. We had a lot of fun waiting in line, but didn't get any times. FYI, no problems passing tech inspection.

At least there were donuts.

Atlanta Dragway is going to be open Friday, October 24 and Friday, November 7. We should try to shoot for one of those.

Jeeeeeeeeeesus. This is amazing...

My XP car is now mufflerless. Just 2.5" all the way back from the GT2560R to a turn down before the diff. Hasn't blown sound at events that care. Harris Hill is 85dB at the fence.

Damn. That sumbitch sounds healthy!

Lovely graphs, and fun video :)

Thanks for sharing. It's doing its job; makes me want to build an Exocet.

It's pretty easy. ;)

Attachment 235107

This thing would probably be a low 12 high 11 sec car..

There is only one way to find out. I say throw a set of sticky tires on there and head to Atlanta Dragway on Nov 7!!!

It should definitely be stupid quick

awesome numbers. pullin some serious tq

Any news on the drag times? How is the bottom end holding up?

Bottom end got ventilated, but not how you think.

The owner of the car let someone drive that was unfamiliar with anti-lag and no-lift shift. And turbos. And mechanical empathy. And common sense. Said nameless individual drove the car a few laps around Roebling riding the clutch quite badly, engaging the anti-lag rev limit. Their decided course of action was to, well, ignore the pits, keep driving around the track with his foot flat in the throttle, cannons going off underneath the car, at a 3500 RPM rev-limit.

The #4 con rod decided it needed to escape its prison and travel the world. The piston was cracked, I'm guessing from multiple flame-front detonation from the insane temperatures that must have developed. The flywheel and pressure plate were also glazed.

I'm kinda butthurt about it, but the car has a new bottom end now. The head got lightly kissed, but not enough to replace any valves. Probably.

I've gotten two PMs asking about anti-lag blowing up their turbo cars, so I'll post my response here so the community can weigh in or correct me:

Your FM2 car is fine. Anti-lag is something you won't see on 99% of aftermarket turbo installs. They're usually not enabled on the tune or ECU, and for many management systems, it's a specific upgrade that you have to buy a code for.

Anti-lag can be used in three common instances. Launch control (pretty rare), upshift (very rare), off-throttle (during a rally stage only). It's really, really rough on cars, and it's only used when you consider your powertrain to be a consumable part.

Launch control functionality (in the scope of these aftermarket ECUs) is pretty much limited to keeping the engine revving at a consistent RPM so you can let out the clutch in a more repeatable manner. This is normally accomplished by cutting fuel and spark in the same manner as the redline rev limit. For turbo cars, it would be beneficial to launch with the turbo spooled up, which is where anti-lag comes into play.

Anti-lag is something you should research and understand before enabling on your car. Most implementations retard the spark so the combustion event continues into the exhaust stroke, which creates a ton of exhaust gas without making much power. This is useful to spool turbos while keeping at a pre-determined RPM. The downside is that it is very rough on engines, exhaust valves, turbos, manifolds, and exhaust systems. As such, it is used sparingly on racecars, and really has no purpose on street cars other than to be really obnoxious (which is fun sometimes).

No-lift antilag comes into play on upshifts. You clutch in, leave the throttle pinned, the engine drops to a pre-determined RPM, you shift into a higher gear, then let out the clutch. As the engine drops to that pre-determined RPM, it does the whole delayed-ignition thing, which spools up the turbo so you have as much boost as possible in the beginning of the next gear. This is what happened to XP-4, as the clutch was pushed in (switch engaged) and the driver didn't realize he was slipping the clutch in fifth gear. For multiple laps.

An anti-lag event is very violent and sounds like a gunshot. Here are a few examples in video form:
When you hear a gunshot between shifts (Renault at 1:11 is a good example), that's the no-lift upshift anti-lag.

I have spark cut launch control turned on and I have no clue how you wouldn't notice it, especially in an excocet, it sounds like you filled your exhaust with firecrackers.