How much boost . . . - 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 08-16-2007, 12:49 AM   #1
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default How much boost . . .

Could a Junkyard 1.8 take, if a junkyard 1.8 could take boost??


187,000 miles on the engine that came from a 1993 Escort GT automatic (The trans is why it was junked...) that I obliterated to get my little motor from. When I arrived at this car the hood was still shut and most of the car was in pretty good condition. Out came the sawzall and some other misc hand tools and we ripped it apart.



100% disassembly of the engine has yielded some excellent results. Found pretty much every specification of the motor was within limits on everything from the cylinder walls, main journals, rod journals.. Hell, even the oil pump gears were within spec!

The cylinder head was gone though, it had so much carbon built up on all 16 valves not a single one of the sealed. Problem easily solved.

Throwing the motor back together and stuffing it back into my car with some extra features added... Gonna see how long this little guy will take 17psi from a Warner Ishi RHB52 turbocharger.



Any bets how long she lasts?






Stock 1.8 Block
Stock Forged Crankshaft
Stock connecting rods
Stock cast aluminum pistons
OEM Bearings
187,000 mile piston rings
9:1 compression ratio
Stock rebuilt cylinder head w/3 angle valve job
Stock cams, valves, springs, followers, retainers, keepers
ARP Head studs
Stock metal head gasket
Shimmed tension spring on oil pump for increased pressure
Megasquirt EMS
TechEdge 2A0 Wideband oxygen sensor controller w/Bosch Sensor
Stock ignition system
ETD Racing Mild steel turbo manifold
WarnerIshi RHB52 Turbocharger (Should be good for almost 19psi.. lol)
Mitsubishi Starion frontmount intercooler
SPEC Stage3+ Clutch (good for 400# of torque)
Stock Cooling system

God speed, little engine that should.
elesjuan is offline   Reply With Quote
Old 08-16-2007, 12:52 AM   #2
Senior Member
 
Join Date: Oct 2005
Location: Knoxville
Posts: 1,168
Total Cats: 0
Default

why would you not give it new rings?
Al Hounos is offline   Reply With Quote
Old 08-16-2007, 01:00 AM   #3
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

I'm cheap. That would require enough cost and work it wouldn't honestly be worth it. The cylinder walls still have hash marks and the rings aren't polished. They'll seal well enough for now.

Theres another motor I'm doing a full build on, this is just to get my car running again.

I might add, the motor cost about $50.00.
elesjuan is offline   Reply With Quote
Old 08-16-2007, 01:40 AM   #4
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

if you dont care about the motor and your turbo is good to 19psi then run 19psi.
neogenesis2004 is offline   Reply With Quote
Old 08-16-2007, 01:41 AM   #5
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

next question: why the pink block?
curly is online now   Reply With Quote
Old 08-16-2007, 01:47 AM   #6
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Cause it's super JDM tight yo...
Dur.
cjernigan is offline   Reply With Quote
Old 08-16-2007, 02:21 AM   #7
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

Quote:
Originally Posted by curly View Post
next question: why the pink block?
Cause I have a dSLR and didn't really feel like adjusting the color and exposure correctly from shooting in manual mode with flash. I assure you, it's really red.

elesjuan is offline   Reply With Quote
Old 08-16-2007, 04:33 AM   #8
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,362
Total Cats: 1,323
Default

17psi? I give it 6 months.
Savington is offline   Reply With Quote
Old 08-16-2007, 08:35 AM   #9
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

A completely stock block is stable at 12 psi. Like forever stable unless you overheat or lose oil pressure etc.

At 15 psi, you are probably pretty safe with a conservative tune, but the crappyness of the stock fuel rail will conspire against you if you get too close to the edge. Also, it is easy to hit 17 psi if the weather turns cold and you ran 15 all summer.

Then again, if you really know what you are doing, there have been guys that ran nearly 30 psi on the stock block and didn't blow anything up. Ric made 400+ and ran 10s on a completely unopened block. Still, a lot of those guys have blown up a lot of engines. My hunch is that 18 psi = isntagib for the stock rods.


On a built motor with a real fuel rail, I really wouldnt worry about reliability at least in the raw sense of "can my motor make X amount of power without bending?" Forged internals can pretty much go as far as your turbo unless you fry a piston through bad tuning. Pauter/wiseco/turbo is a combo that is good up to the 500+ range.

I haven't heard of anyone ruining headgaskets from too much boost. Some guys run ARP head studs but the ones that don't haven't been turning into MK3 supras.

Last edited by beerslurpy; 08-16-2007 at 10:10 AM.
beerslurpy is offline   Reply With Quote
Old 08-16-2007, 09:37 AM   #10
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

I see veritcal scoring.
Braineack is online now   Reply With Quote
Old 08-16-2007, 09:40 AM   #11
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

pics aren't working of rme hmm might be the PC though damn vista. :P
magnamx-5 is offline   Reply With Quote
Old 08-16-2007, 10:41 AM   #12
Miotta FTW!
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,295
Total Cats: 26
Default

WTF does everyone try to talk in PSI.... Its a meaningless number! Power breaks things... not PSI.

:grumble:
Splitime is offline   Reply With Quote
Old 08-16-2007, 11:11 AM   #13
I'm Miserable!
iTrader: (1)
 
Join Date: Oct 2005
Location: Columbia, SC
Posts: 858
Total Cats: 0
Default

Quote:
Originally Posted by Splitime View Post
WTF does everyone try to talk in PSI.... Its a meaningless number! Power breaks things... not PSI.

:grumble:


I can think of a few turbos that would murder a 1.8 on 12psi after a half mile or so.
SloS13 is offline   Reply With Quote
Old 08-16-2007, 11:52 AM   #14
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

maybe if your talking about a GT1241....
Braineack is online now   Reply With Quote
Old 08-16-2007, 12:32 PM   #15
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

ahem he listed his turbo at the start dude
Quote:
Originally Posted by elesjuan View Post
Could a Junkyard 1.8 take, if a junkyard 1.8 could take boost??


Gonna see how long this little guy will take 17psi from a Warner Ishi RHB52 turbocharger.


Last edited by Braineack; 08-16-2007 at 01:12 PM.
magnamx-5 is offline   Reply With Quote
Old 08-16-2007, 01:26 PM   #16
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

ok, then ....that little turbo can only output 320CFM above 60% efficiency and can support around 30psi (3PR).

stock output on a 1.8 is 190CFM....so you're looking at maxing that turbos potential on your engine at about 10psi.

320/190 = 1.7 X 14.7 - 14.7 = 10psi

anything more than that will be hot *** air, so 18psi with that little turbo wont do anything for you but cause heat and ping and kill it fast.
Braineack is online now   Reply With Quote
Old 08-16-2007, 08:37 PM   #17
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

I'm glad someone mentioned fuel rail.. I totally forgot that I needed the upgrade.

elesjuan is offline   Reply With Quote
Old 09-17-2007, 09:15 PM   #18
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

Update!!

I have fully assembled the engine and performed a cylinder leakage test on it.. Here are my results!!


#1: 24%
#2: 27%
#3: 15%
#4: 21%




I'm getting excited!!!!
elesjuan is offline   Reply With Quote
Old 09-17-2007, 09:55 PM   #19
Elite Member
iTrader: (39)
 
Zabac's Avatar
 
Join Date: Sep 2007
Location: High Point NC
Posts: 4,854
Total Cats: 8
Default

green=sex
Zabac is offline   Reply With Quote
Old 09-17-2007, 11:51 PM   #20
Elite Member
Thread Starter
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

Quote:
Originally Posted by whaaamx5 View Post
green=sex
DEEP into the low side of the green, none the less!!!!!

I can't wait to see this thing run!
elesjuan is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
LucaCarMods's Boosted Dutch Miata Build! LucaCarMods Build Threads 11 02-14-2016 07:13 AM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM


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 06:56 PM.