Don't want to blow my engine - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 11-28-2007, 11:18 PM   #1
Junior Member
Thread Starter
 
Join Date: May 2007
Posts: 119
Total Cats: 0
Default Don't want to blow my engine

i was wondering what would be safest max psi i can run on my 1.8l 6speed.
mxdrift is offline   Reply With Quote
Old 11-28-2007, 11:40 PM   #2
Elite Member
iTrader: (3)
 
Mach929's Avatar
 
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,500
Total Cats: 0
Default

42psi as long as you don't use too much nos
Mach929 is offline   Reply With Quote
Old 11-28-2007, 11:46 PM   #3
Senior Member
 
Join Date: Mar 2006
Posts: 1,379
Total Cats: 1
Default

Quote:
Originally Posted by mxdrift View Post
i was wondering what would be safest max psi i can run on my 1.8l 6speed.
0 would be the safest.

Now if you are moderately risk adverse 6 PSI, those who are a little braver run 12 PSI, through down some cash and do it right, about 20 PSI. I ran 18 PSI on the stock motor for a while.

Mark
Markp is offline   Reply With Quote
Old 11-28-2007, 11:53 PM   #4
Elite Member
iTrader: (3)
 
Mach929's Avatar
 
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,500
Total Cats: 0
Default

ya, i was joking, need to know your setup before anyone can give you any suggestions. plus what you use the car for and how much you rely on it
Mach929 is offline   Reply With Quote
Old 11-29-2007, 01:25 AM   #5
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,370
Total Cats: 1,332
Default

15psi from a GT2554R is safe on the stock block. 10psi from a GT3276R will be rough on the stock block. 6psi of ANYTHING without proper tuning will grenade even the most heavily built motor in short order. What's your setup?

The general thought is that you're safe on stock internals up to around 250whp. The larger a turbo you use to get there, the safer you are (less heat).
Savington is offline   Reply With Quote
Old 11-29-2007, 01:39 AM   #6
Elite Member
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 8,797
Total Cats: 248
Default

I've been running 32 PSI for over a year with a stock motor with no problems; my tires are wearing fine.....

"Safest Max PSI"

That's a contradiction. Zero would be the safest. Around here your gonna BS answers when you post something without any background info. I dare say but give us a good idea of your budget, goals, and desire to fabricate and maybe we can help.
patsmx5 is offline   Reply With Quote
Old 11-29-2007, 02:40 AM   #7
Senior Member
 
Join Date: Oct 2007
Location: Norrahammar, Sweden
Posts: 614
Total Cats: 6
Default

If you love your engine, you will blow it and swallow.
Torkel is offline   Reply With Quote
Old 11-29-2007, 08:23 AM   #8
Junior Member
Thread Starter
 
Join Date: May 2007
Posts: 119
Total Cats: 0
Default

thanks for you info my set up is sr20det turbo re-built, greddy profec 2 boost controller, aem wideband with 02 sensor, aem f/ic, rx-7 550 purple top injectors, 28x9x3 frontmount 2.5 piping, 3" turbo back exhaust, everything ealse the shop is going to do it i'm going to use the car for drifting and street.. i would like to run 10psi but i didn't know if that would be safe or not
my goal for hp is 220 to 240 if that's possible... i just bought the parts the shop is going to the everthing ealse.
mxdrift is offline   Reply With Quote
Old 11-29-2007, 09:09 AM   #9
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

250+ is possible if your cooling holds out from there out i would look at a bigger turbo.
magnamx-5 is offline   Reply With Quote
Old 11-29-2007, 09:52 AM   #10
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

I think 240 whp would be pushing it for that T25, but the rest of your equipment is spot on for 300 whp. If you aren't strapped for cash I'd move to a slightly bigger turbo. If you are tune what you've got and see what your intake temps are like.
Arkmage is offline   Reply With Quote
Old 11-29-2007, 10:25 AM   #11
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

I don't think the sr20 turbo (60 trim) likes to output more than 25 lb/min, which is good for around 200-220rwhp max.

with that in mind, they make boost fast, have a SCer like torque curve and is a get into turbo....once the boost bug bites, you can easily upgrade to a T28, GT25, GT28, etc.
Braineack is offline   Reply With Quote
Old 11-29-2007, 10:39 AM   #12
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

That's the turbo I run.. made 190whp on bandaids at 12psi... shouldn't be too hard to make that much on the 10psi you're running with the AEM. If my motor isn't blown, I'll be dyno'ing shortly and will be able to tell you what the SR20 .60 is good for. I'm running a 2.25" exhaust, but I'm still hoping for [email protected] might be dreaming, but there's always 14psi.

Also, mxdrift, fill out your profile with your location and put a short list of your setup in your signature so people don't have to ask you in the future.
samnavy is offline   Reply With Quote
Old 11-29-2007, 01:43 PM   #13
Junior Member
Thread Starter
 
Join Date: May 2007
Posts: 119
Total Cats: 0
Default

all right i'll do
mxdrift is offline   Reply With Quote
Old 11-29-2007, 06:22 PM   #14
Elite Member
iTrader: (3)
 
Mach929's Avatar
 
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,500
Total Cats: 0
Default

10psi should be peferctly safe and fun around 200whp
Mach929 is offline   Reply With Quote
Old 11-29-2007, 09:52 PM   #15
Junior Member
Thread Starter
 
Join Date: May 2007
Posts: 119
Total Cats: 0
Default

really good what if i wanted 240hp how could i get there
mxdrift is offline   Reply With Quote
Old 11-29-2007, 10:50 PM   #16
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Quote:
Originally Posted by mxdrift View Post
really good what if i wanted 240hp how could i get there
Safely?

New pistons, rods, and rings.
Saml01 is offline   Reply With Quote
Old 11-30-2007, 08:14 PM   #17
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,370
Total Cats: 1,332
Default

240whp will take a GT2560R, a built shortblock, a standalone EMS, and a big exhaust. Your 2nd gear will be essentially useless on the street, and you will probably break a transmission within 3-5 years, FAR less if you shift hard regularly. The car will run a low-mid 13 second quarter mile.

What experience do you have with fast cars (and I'm talking faster than STIs)?
Savington is offline   Reply With Quote
Old 11-30-2007, 08:21 PM   #18
Junior Member
Thread Starter
 
Join Date: May 2007
Posts: 119
Total Cats: 0
Default

well i have the big exhaust i'm using full 3"turbo back and about the faster than sti umm nothing he he...
mxdrift is offline   Reply With Quote
Old 12-01-2007, 02:53 AM   #19
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,370
Total Cats: 1,332
Default

Quote:
Originally Posted by mxdrift View Post
well i have the big exhaust i'm using full 3"turbo back and about the faster than sti umm nothing he he...
Because I'm a ******* mind-reader and I know what "nothing he he" means. I've had at least one person tell me they couldn't handle a 220whp Miata on an everyday basis, and for someone who isn't looking for a really fast car, I agree with them. You're running a 3" turbo-back on your stock motor?

Fill your signature with your mods so we can actually help you.
Savington is offline   Reply With Quote
Old 12-01-2007, 08:11 AM   #20
Junior Member
Thread Starter
 
Join Date: May 2007
Posts: 119
Total Cats: 0
Default

all right

Last edited by mxdrift; 12-01-2007 at 08:40 AM.
mxdrift is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Garrett Turbo, 1.8 Oil Pan, & Misc. Stuff nbdooey Miata parts for sale/trade 9 08-30-2017 10:50 PM
Buzzing from driver side of engine bay? (MS3 install) nick470 MEGAsquirt 7 06-16-2017 02:53 PM
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
In need of base map for stock 1997 brandonbkd MEGAsquirt 0 09-29-2015 12:52 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:32 AM.