End of my Begi S3 saga with Ken Hill Mods and Tuning (dyno) - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-09-2012, 12:51 AM   #21
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Not offended at all. I just have. I explanation.
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Old 04-09-2012, 12:53 AM   #22
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Originally Posted by Mobius View Post
Nice. Very nice.

You can pull the xede tables yourself. Install xmap off the Begi cd (or grab it from Chiptorque), connect to the serial port, and turn the key on. Download maps. Show all maps. Screenshot for win. We want to see the MAF and the Timing table. And the TPS table if it's used, this is an MSM right?
Picking It up in a week.
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Old 04-09-2012, 02:25 AM   #23
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Originally Posted by thirdgen View Post
Perhaps MSM head/ cams are that much better at making power than older 1.8's?
The MSM cam is actually not as good as a stock '99 cam for forced induction according to FM. The MSM badges are worth 5whp per instance so he's really just got a legit 230whp plus the bling...

JK/OP!
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Old 04-09-2012, 05:11 AM   #24
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Originally Posted by cardriverx View Post
Assuming a BSFC of .65 and 270HP, the estimated fuel demand comes out to around 43-44 lb/hr of fuel per injector which is roughly 450cc/min. They are most definitely maxxed out at that power, but workable. If we got a log of the duty cycle we could know for sure.
450cc injectors should be maxed out at around 230whp. 550s are good to just over 300whp.

OP, not to rain on your parade, but I suspect that particular dyno reads around 10% high. A 2560R at 12psi should only make about 240, maybe 250whp at sea level, and that assumes everything else is perfect - you're still breathing through a factory exhaust, which really makes 270+whp at 12psi hard to believe. Do you know what a bone-stock Miata makes on the same dyno?

Last edited by Savington; 04-10-2012 at 05:06 AM. Reason: e: mixing up BSFC on the daily y0
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Old 04-09-2012, 05:15 AM   #25
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The torque curve is really, really funky on this car, too. There's virtually no torque drop at high RPM, but the low-RPM torque is really poor. 2560Rs can typically make 200wtq well before 3500rpm (as early as 3100rpm with a tubular exhaust manifold, VVT, or head porting), but your car doesn't see 200wtq until 3700rpm.

I suspect the BEGi intake manifold is doing you no favors. At those power levels, you may consider switching to a factory intake manifold to pick up some low-end torque.

I'd also like to know why the pulls stop at 6300rpm - the motor obviously isn't done there. Based on those curves there's ~280 or 290whp at 7000rpm available - which unfortunately makes the numbers all that much more far-fetched.

OK, I'll stop crapping all over the OP now. I've heard great things about Ken, and I'm sure the car drives great. Confirm with Ken that the injector duty cycle percentage is safe, and enjoy the car.
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Old 04-09-2012, 05:16 AM   #26
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No I will ask Ken. I'm sure he has dynod his yellow Miata which had lots of dyno time at fm.
Ken tells me fm dyno reads high so he should have a feel for it.
This car did about 240-245 on a mustang dyno with a much worse tune btw.
I think these are ballpark.
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Old 04-09-2012, 05:18 AM   #27
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BEGI intake not manifold. Stock manifold.
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Old 04-09-2012, 05:20 AM   #28
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Also no tubular exhaust as the s4 exhaust cracks and is unreliable.
S3 is diff. Check the pic and the website for details.
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Old 04-09-2012, 05:21 AM   #29
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No vvt on Msm. No head porting.
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Old 04-09-2012, 05:28 AM   #30
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If I read the thread correctly, he's running RX8 injectors at 60psi.

That's ~600ishcc injectors if they are ran at the higher-than-43.5psi they are rated for.

/2c
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Old 04-09-2012, 05:35 AM   #31
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And btw. I'm great with 250. I don't really want to break my engine.
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Old 04-09-2012, 07:56 AM   #32
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Yea....that "Egojet" must be WAYYY out of whack. And hearing that you are on a stock VTCS, 450's, sucking through a stock MAF all makes me believe that even more. But.....you do have the Mazdaspeed Oil cap!!!
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Old 04-09-2012, 08:48 AM   #33
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I have never dynoed a stock MSM. I have run a few MSMs with little enchillada packages and they come in at 195hp and 190ft-lb.

This car has a GT2860RS (Disco Potato) which explains the soft bottom end and strong top end. The car has a cast iron manifold.

Also, the Xede is using the TPS signal to kick the OEM ECU out of closed loop control. We are not coming out of closed loop until about 3800RPM adding to the soft bottom end. I will be addressing this on the street this week before the car gets picked up.

At 12psi (measureed by the autometer boost gauge) the injectors are maxed out. However, the A/F is showing 12.0:1 on the 12psi run and I know this dyno reads about a point lean so the true A/F is closer to 11.0:1. Personally, I'd run the car at 10psi and have a great time. I am truely amazed by the numbers.
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Old 04-09-2012, 09:35 AM   #34
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Numbers seem more reasonable if its a potato and not a 2560 .
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Old 04-09-2012, 09:54 AM   #35
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yeah that make a bit of a difference


I'd still be worried about 450cc injectors and 270rwhp.


my 460cc injectors are completely maxed out at around 230-240rwhp.
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Old 04-09-2012, 10:32 AM   #36
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Quote:
Originally Posted by Braineack View Post
yeah that make a bit of a difference


I'd still be worried about 450cc injectors and 270rwhp.


my 460cc injectors are completely maxed out at around 230-240rwhp.
at what fuel pressure?
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Old 04-09-2012, 11:06 AM   #37
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stock. ~50psi before boooooost.
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Old 04-09-2012, 11:35 AM   #38
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Another item to consider is that sure, nb base FP is 60 psi... But that isn't corrected for boost, at 12 psi the injectors are effectively seeing 48psi of FP. Still more than base on a NA, but a big difference from the ~580 cc they flow @ 60psi.
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Old 04-09-2012, 08:52 PM   #39
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OP, just post up a screen shot of a datalog of a pull showing injector duty cycle so we can all stop bickering =)
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Old 04-09-2012, 09:17 PM   #40
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