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Old 12-01-2009, 10:37 AM   #1
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Default How much boost/PSI can I get from my BEGI-S?

I currently have 5 PSI, in my begi-s GT 2554 turbo, without an intercooler. I believe it will go up to 8 psi, so i want to match an intercooler to what i can get it to. Thanks.

While am at it, I am either going to use begi's intercooler upgrade, but am considering this one from ebay;
89-93 Mazda Miata MX5 T28 Intercooler kit bolt on + BOV:eBay Motors (item 160379221216 end time Nov-24-09 17:55:45 PST)

Good, bad, or ok choice?

Be gentle, i'm still learning. I do know i need a megasquirt, and 5 psi is not enough boost, i will settle for 8.
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Old 12-01-2009, 11:15 AM   #2
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That's what I used. Check my signature for diy. Do you have a wideband? If not I. Reccomend picking up one worth every cent
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Old 12-01-2009, 11:25 AM   #3
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Be gentle, i'm still learning.....
Simple: ebay intercooler miata

site:forum.miata.net ebay intercooler miata - Google Search

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Old 12-01-2009, 11:34 AM   #4
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Quote:
Originally Posted by cburgess72 View Post
I currently have 5 PSI, in my begi-s GT 2554 turbo, without an intercooler. I believe it will go up to 8 psi, so i want to match an intercooler to what i can get it to. Thanks.

While am at it, I am either going to use begi's intercooler upgrade, but am considering this one from ebay;
89-93 Mazda Miata MX5 T28 Intercooler kit bolt on + BOV:eBay Motors (item 160379221216 end time Nov-24-09 17:55:45 PST)

Good, bad, or ok choice?

Be gentle, i'm still learning. I do know i need a megasquirt, and 5 psi is not enough boost, i will settle for 8.

You should be able to run 25-30 psi no problem

no but seriosuly, you should be able to get away with 8 psi with an intercooler. just listen for knock and be prepared to retard the base timing a little bit of needed.

edit: just noticed you have a bipes unit. turn it to 10.
you have a wideband?
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Old 12-01-2009, 02:03 PM   #5
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You should be able to run 25-30 psi no problem
I was going to guess this much if you completely disconnect the wastegate signal line. I'd like the OP to find out and get back to us on an actual number, that would be fun to know.
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Old 12-01-2009, 02:47 PM   #6
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Reccomend picking up one worth every cent
"Recommend" as in "I recommend you use a condom when you have sex". Not using a wideband can result in catastrophic failure - not always, but enough of the time that you should be using one.
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Old 12-01-2009, 03:19 PM   #7
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Originally Posted by TurboTim View Post
I was going to guess this much if you completely disconnect the wastegate signal line. I'd like the OP to find out and get back to us on an actual number, that would be fun to know.
I figure the efficiency would get so low that the boost would stop rising somewhere around there
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Old 12-01-2009, 05:54 PM   #8
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Default will ad wideband to the list.

Thanks for the input. Glad i don't have to replace the current turbo to get a little more boost.
If you where going to by a wideband kit to install, leaning towards reasonble price, where would you go?
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Old 12-01-2009, 05:57 PM   #9
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Originally Posted by cburgess72 View Post
Thanks for the input. Glad i don't have to replace the current turbo to get a little more boost.
If you where going to by a wideband kit to install, leaning towards reasonble price, where would you go?
Depends on who you ask. What is your idea of a "reasonable price"? Most people seem to like the LC-1. I've got it, works great, but if you dont RTFM you will have issues. The AEM Uego is also a popular choice. It doesn't read as fast as the LC-1, but from what I hear its quite a bit easier to install. If you are feeling adventurous and aren't bad with a soldering iron, you could try the JAW ( google it ). I think it comes in at under 100 bucks.
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Old 12-01-2009, 05:59 PM   #10
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uego for 200 was what I considered "reasonable". Easy to install, looks and works good. Great wideband for a good deal.
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Old 12-01-2009, 06:00 PM   #11
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If you put a MS PNP on your car, the turbo can be run up to 12 psi on a motor with stock internals.
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Old 12-01-2009, 06:07 PM   #12
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Default Hi Stephanie

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?
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Old 12-01-2009, 06:08 PM   #13
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this one. ditch those crappy band aids and get a real engine management unit, like MS.
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Old 12-01-2009, 06:11 PM   #14
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Im gonna say go with the LC-1

Ive used the AEM and the LC-1 and there is a noticeable lag in the AEM, which is fine if youre just using it for monitoring it, but it can be very annoying when trying to tune AFRs
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Old 12-01-2009, 06:17 PM   #15
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Default I know,

i'm checking my credit card balances now.
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Old 12-01-2009, 06:23 PM   #16
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i'm checking my credit card balances now.
You'll find yourself doing that very often once you start modding your car
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Old 12-01-2009, 06:58 PM   #17
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You'll find yourself doing that very often once you start modding your car
Haha so true, I find my car fund stack of cash depleting rapidly lately, and I haven't even started my IM build yet!
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Old 12-01-2009, 07:11 PM   #18
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Originally Posted by Savington View Post
"Recommend" as in "I recommend you use a condom when you have sex"........not always, but enough of the time that you should be using one.
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Old 12-01-2009, 10:27 PM   #19
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"A girl cant get pregnant if shes on top, its gravity" Knocked up
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Old 12-16-2009, 03:13 PM   #20
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