How much boost/PSI can I get from my BEGI-S? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-16-2009, 05:07 PM   #21
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This is Charlie up in Fort Worth. The miata i'm asking about here is the test one you guys did a couple of years ago (smurf blue). She is rstill running great.

When you say 12 psi, does that mean with this turbo, or would i need bigger one?
That means you can run around 12psi safely before the rods in your engine bend. That's with engine management. Skip this forum conversation and just call up BEGI and talk with them.

You can run an ebay intercooler no problem but you will have to get your own couplers, clamps, proper pipes etc. That might be intimidating if it's your "first time".

Call begi.
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Old 12-16-2009, 05:41 PM   #22
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This is Charlie up in Fort Worth. The miata i'm asking about here is the test one you guys did a couple of years ago (smurf blue). She is rstill running great.

When you say 12 psi, does that mean with this turbo, or would i need bigger one?
Hey there! How is the smurf doing? Guess the boost bug bit, huh. Glad to see the very first 1.6L BEGI-S is still going strong!

You can run 12 psi on this turbo if you add larger injectors and engine management. The best bang for the buck is the MS PNP. I would also add an intercooler at that boost level too. You can do things in stages, but I would probably do the MS first.
Hope that helps,
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Old 12-16-2009, 06:01 PM   #23
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Default The first BEGI-S

I knew it was the 1st for the 1.6, was there a 1.8 Begi-S before the Smurf?
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Old 01-04-2010, 06:47 PM   #24
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When you say 12 psi, does that mean with this turbo, or would i need bigger one?
Thats what im thinking, I can do 14-15psi I dont because its a daily driver but the t2554 cant do much damage with a good tune and a great intercooler.

the 2560 on the other hand may be able to do a better job at shredding internals.

But then again Im the guy who is still using a stock clutch at 11psi so I dont seem to be the norm.
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Old 01-04-2010, 08:48 PM   #25
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Default Just installed a wideband this past weekend.

Just now noticed your edit Fult Tilt Bogie, will put the Bipes to 10 in the morning.
My wide band (AEM) reads about 14 when I am on the throttle, so far so good i guess.

FYI-I just got 1.8 rotors and an 1,8 open diff for $250 for all of it, so i guess tha's what i am doing next.

BUT- given my current setup (stock exhaust,5 psi, no intercooler yet) would i have more fun getting 3 inch exhaust, or megasquirt pnp next? I am building slow, learning as i go. Eventually I will add intercooler and up the boost.

Thank for the input.
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Old 01-04-2010, 09:09 PM   #26
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Originally Posted by cburgess72 View Post
Just now noticed your edit Fult Tilt Bogie, will put the Bipes to 10 in the morning.
My wide band (AEM) reads about 14 when I am on the throttle, so far so good i guess.

FYI-I just got 1.8 rotors and an 1,8 open diff for $250 for all of it, so i guess tha's what i am doing next.

BUT- given my current setup (stock exhaust,5 psi, no intercooler yet) would i have more fun getting 3 inch exhaust, or megasquirt pnp next? I am building slow, learning as i go. Eventually I will add intercooler and up the boost.

Thank for the input.
Is this WOT @ full boost? Ive never used an FPR but i would think 14/1 is way to lean. In boost im at 11.5/1





Get a Megasquirt
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Old 01-04-2010, 10:36 PM   #27
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Default 14/1, thats at full boost, buut i only ran it once,

I will run it tomorrow and get more accurate numbers to post.

I am ordering a mspnp right now.

But now for the dumb question, so if i'm lean with the current setup, to correct the situation, adjust the bipes for more timing retard, but what else could be done to get to 11/1 at full boost.

Thanks in advance.
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Old 01-04-2010, 11:06 PM   #28
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20 g's.
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Old 01-05-2010, 10:08 AM   #29
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Bipes is for timing and the FPR is for fuel/air ratio (AFR). The 14 indicates 14 units of air per unit of fuel so a reading of 11 on your gauge indicates less air per unit of fuel, or a richer condition than a 14.

Are you familiar with a device called an O2 clamp? I'm going to take a stab that you maybe haven't (but the MS will solve the problem, too).

Have you read the FAQ in the stickies about how these things work and how NOT to blow up your engine? The MSPNP is not a 'plug in and forget' arrangement and will require significant effort to understand and operate initially. The PNP designation really only alludes to the fact that you don't need to solder and assemble it yourself. You will need to understand both what your engine requires and how to achieve that requirement. I am concerned for you that you did not realize that 14 to 1 AFRs in boost were a significant danger and that you asked about the bipes as a means to correct the problem.
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Old 01-05-2010, 11:33 AM   #30
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Default I do have an 02 clamp,

I bought it used, hope it is working correctly, the led light comes on, i just copied off the testing procedure to check it out.
And thanks for your concern, you are right, this all new to me, so I am taking it slow, and i am reading to try and get it tuned correct.
The MSPNP is on the way, but i am determined to get a safe tune with what i have, in hopes it helps understand a little more before working with the MSPNP.
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Old 01-06-2010, 12:06 AM   #31
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GEt the MAf delete. And a 3" bang bang exhaust.
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Old 01-13-2010, 09:02 AM   #32
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Default Wideband readings revised.

My new wide band show 14/1 at lower rpm's, but when i am on the throttle in boost, it read 12/1,
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Old 01-14-2010, 04:54 AM   #33
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12 or under is good but if u can get about 11.5 you should be golden.

When you are cruising along and not stepping on it and you're running under that 0 on the vac/boost gauge, 14-15 a/f is normal, when you get closer to the 0 you want ur stuff to start going towards the 13-12, when you go over it into boost you want about 11.5a/f
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Old 01-14-2010, 05:02 AM   #34
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12:1 is lean. 12.5:1 is very lean. 12.9:1 is EXTREMELY lean. Have you considered hiring a tuner to ensure you don't damage your engine?
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Old 01-14-2010, 05:13 AM   #35
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actually 12:1 is perfect however due to the heat caused by the turbo thats why people go lower

12:1 is perfect for natural aspiration / under 0 psi numbers since they dont have the added heat from the turbo.
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Old 01-14-2010, 05:18 AM   #36
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Spec Miatas make the most power in the high 12s, low 13s IIRC. I've found that turbo cars make the most power at ~11.5:1. I've also found that they are very, very prone to detonation when AFRs go any leaner than 12.0:1.
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Old 01-14-2010, 08:34 AM   #37
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1. Install BEGi kit
2. Enjoy Boost
3. Want moar
4. Get tired of blind tuning
5. Get MEGASQUIRT
6. ?????
7. Profit
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Old 01-14-2010, 01:10 PM   #38
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Spec Miatas make the most power in the high 12s, low 13s IIRC. I've found that turbo cars make the most power at ~11.5:1. I've also found that they are very, very prone to detonation when AFRs go any leaner than 12.0:1.
We have tuned plenty of cars at 12:1, that make great power, and have no detonation. For a street car, 12:1 is perfect, as long as there is no detonation. There are many other factors involved, but we usually make the most power at 12.5:1, here at (almost) sea level.
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Old 01-14-2010, 03:51 PM   #39
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To each their own. I set a GT2554R up on a stock 1.8, tuned it at 12.0, and then richened it to 11.6 and saw another 4whp. I believe Ben saw the same thing on his old GReddy kit (max power in the mid 11s).
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