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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 02-04-2007, 10:26 PM   #1
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Default max boost that can be run On a 1.8 without an IC

how much boost can safely be run on a 1.8 motor without a Intercooler, Is the limit 7-8psi , how much should timing be retarded to say run it streetable like for say one to two weeks. I was thinking of doing it the greddy way.
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Old 02-04-2007, 10:35 PM   #2
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On the 1.6 greddy kit 6psi at 6* timing were recommended. Why take the chance and run it this way when you don't really have to. Get an I/C sorted out, you'll be happier.

Jay
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Old 02-05-2007, 12:00 AM   #3
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or get a WI kit
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Old 02-05-2007, 12:43 AM   #4
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Don't you hav an intercooler?
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Old 02-05-2007, 12:50 AM   #5
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Did you sell both of them? Just boost it untill it explodes.
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Old 02-05-2007, 12:53 AM   #6
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I ran ~7psi intercooled for some time (a couple months). Ran 6° base before getting the Bipes, but that pinged a bit still. Ran 12° base and pulled to ~4-5° later with the Bipes.
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Old 02-05-2007, 01:04 AM   #7
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Quote:
Originally Posted by RicanmiataRacer View Post
how much boost can safely be run on a 1.8 motor without a Intercooler, Is the limit 7-8psi , how much should timing be retarded to say run it streetable like for say one to two weeks. I was thinking of doing it the greddy way.

I wouldn't boost over 6psi without an intercooler. You're going to have to retard to timing like mad and make your EGTs skyrocket.
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Old 02-05-2007, 01:14 AM   #8
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I ran 6psi for ~6 months. Base timing 14, bipes pulled to 6 degrees.
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Old 02-05-2007, 09:38 PM   #9
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Ok then It's just A ?, I have a Intercooler ready to install(12x9x2.5) But I still dont know how the hell im going to get 2.5 inch ic piping to fit with the a/c and p/s pump in the way...I just dont see how, its really crowded
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Old 02-05-2007, 09:44 PM   #10
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I used 2.5" pipes but removed my AC prior to installing the intercooler. The way my pipes are routed would not work with the AC compressor. Sorry I don't have any pics of my pipes on my pc and my car's 2 blocks away in the -15 degree weather.
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Old 02-05-2007, 09:46 PM   #11
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Is it hard to remove the A/C and how much extra room would I have to play with?

can this be a one day project?
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Old 02-05-2007, 09:48 PM   #12
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I didn't remove any of the parts in the dash, but what I did wasn't hard, maybe an hour or so. It's also a good way to remove weight before you add the weight of the I/C.

Edit: are you sure you'd rather sacrifice AC in florida than just use smaller pipes before the intercooler?
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Old 02-05-2007, 09:50 PM   #13
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but since I have both p/s and a/c I haft to get a belt for ps only don't I?
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Old 02-05-2007, 09:51 PM   #14
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Yeah you need to buy the shorter belt for miatas with p/s and without ac. Most parts stores will have it in stock.
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Old 02-05-2007, 11:59 PM   #15
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Buy Stripes piping kit for $225. It will take minimal effort to adapt it to your turbo. I'm talking minimal.
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Old 02-06-2007, 12:12 AM   #16
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C'mon, don't you want to see him suffer in the FL humidity with no AC?:gay:
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Old 02-06-2007, 02:40 AM   #17
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15-20 psi with water injection easily.
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Old 02-06-2007, 02:47 AM   #18
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Quote:
Originally Posted by SamS View Post
Yeah you need to buy the shorter belt for miatas with p/s and without ac. Most parts stores will have it in stock.
I have one i bought from FM lol. Their price was competitive and i added it onto an order i made one time. Of course i then decided to not retain PS.
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Old 02-06-2007, 09:55 AM   #19
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Quote:
Originally Posted by Wideopentuning View Post
15-20 psi with water injection easily.
Stock timing? Without an intercooler?

I'd like to see that
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Old 02-06-2007, 11:56 AM   #20
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Quote:
Originally Posted by Brian View Post
Stock timing? Without an intercooler?

I'd like to see that
Hopefully you will. soon
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