Go Back  Miata Turbo Forum - Boost cars, acquire cats. > Performance & Tuning > Prefabbed Turbo Kits
Reload this Page >

High boost with stock downpipe, how retarded am i?

Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market
Sponsored by:
Sponsored by:

High boost with stock downpipe, how retarded am i?

 
Old 08-22-2007, 10:04 PM
  #1  
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Oct 2006
Location: Cincinnati, OH
Posts: 375
Total Cats: 0
Default High boost with stock downpipe, how retarded am i?

I've got pretty much everything required to run big boost sitting in my garage. The only thing i don't have is a downpipe, and my budget is running thin. I can weld and MIGHT be able to fab one, but if i fail, is there any danger to running 15+ pounds on the stock pipe besides taking all day to spool?
StankCheeze is offline  
Old 08-22-2007, 10:26 PM
  #2  
Junior Member
iTrader: (2)
 
Join Date: Dec 2004
Posts: 201
Total Cats: 1
Default

Holy crap, I was getting 7 psi at 4500rpm ... I can't imagine what 15 would take =P Then again, I was on the stock exhaust as well =P
db84drteg is offline  
Old 08-22-2007, 10:33 PM
  #3  
I'm Miserable!
iTrader: (1)
 
Join Date: Oct 2005
Location: Columbia, SC
Posts: 853
Total Cats: 0
Default

the first few psi is what takes some effort to create. After 5 its pretty easy to make whatever boost you want
SloS13 is offline  
Old 08-23-2007, 12:27 AM
  #4  
Elite Member
iTrader: (24)
 
kotomile's Avatar
 
Join Date: Oct 2006
Location: Monterey, CA
Posts: 7,538
Total Cats: 40
Default

kotomile is offline  
Old 08-23-2007, 01:32 AM
  #5  
I'm Miserable!
iTrader: (5)
 
Join Date: Sep 2005
Location: SLC, Utah
Posts: 1,589
Total Cats: 0
Default

bottlenecked exhaust gas can blow head gaskets.
zoom2zoom is offline  
Old 08-23-2007, 02:42 AM
  #6  
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,510
Total Cats: 0
Default

It would probably work, just gonna be slower response and boost control problems. Also apparantly the threat of head gasket issues. gl
akaryrye is offline  
Old 08-23-2007, 10:44 AM
  #7  
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Oct 2006
Location: Cincinnati, OH
Posts: 375
Total Cats: 0
Default

Originally Posted by zoom2zoom View Post
bottlenecked exhaust gas can blow head gaskets.
Perfect, that'll make me get off my *** and finally do my DIY head porting on the spare head sitting in my garage
StankCheeze is offline  
Old 08-23-2007, 10:55 AM
  #8  
Boost Czar
iTrader: (62)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 76,398
Total Cats: 2,296
Default

I dont see how high backpressure will blow head gaskets.....

I can see it increasing the intake temps and causing detontation.....but not just blowing out a head gasket....
Braineack is offline  
Old 08-23-2007, 10:58 AM
  #9  
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,651
Total Cats: 111
Default

10-12 psi is more likey. and power that will come on like a lightswitch after 5k.
__________________
DIYAutoTune.com Tech Support
10AE-T|BEGi S4|MSPNP-Pro EMS|Enthuza Duals|6UL|Etc
Track Rat|2001|VVT|MS3-Pro EMS|Enthuza|Exocet in Progress

Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
Ben is offline  
Old 08-23-2007, 12:35 PM
  #10  
Senior Member
 
Join Date: Mar 2007
Location: Denver, CO
Posts: 564
Total Cats: 0
Default

On my Talon I ran 26psi through the stock exhaust with a gutted cat. It doesn't blow head gaskets, it's just somewhat counter productive. I was trying to get the best quarter mile time I possibly could one night with what I had, but in general turning up the boost before optimizing your exhaust is *** backwards. I'd also upgraded the turbo with one I had laying around, which once again is *** backwards on a stock exhaust. But it was a fun time.
jwarriner is offline  
Old 08-23-2007, 02:57 PM
  #11  
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Oct 2006
Location: Cincinnati, OH
Posts: 375
Total Cats: 0
Default

Originally Posted by jwarriner View Post
On my Talon I ran 26psi through the stock exhaust with a gutted cat. It doesn't blow head gaskets, it's just somewhat counter productive. I was trying to get the best quarter mile time I possibly could one night with what I had, but in general turning up the boost before optimizing your exhaust is *** backwards. I'd also upgraded the turbo with one I had laying around, which once again is *** backwards on a stock exhaust. But it was a fun time.
I know it's *** backwards, but the only things I buy new are tires. Downpipes don't come around that often
StankCheeze is offline  
Old 08-23-2007, 03:27 PM
  #12  
Senior Member
 
Join Date: Mar 2007
Location: Denver, CO
Posts: 564
Total Cats: 0
Default

Ok. Well to answer your question, assuming a good tune with no knock, there is no inherent danger in this unless you run into the surge line on your compressor map (which I doubt in this case).
jwarriner is offline  
Old 08-23-2007, 03:41 PM
  #13  
Elite Member
iTrader: (6)
 
Loki047's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 4,143
Total Cats: -5
Default

Isnt a tony dp on sale now?
Loki047 is offline  
Old 08-23-2007, 04:53 PM
  #14  
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,254
Total Cats: 2
Default

Originally Posted by db84drteg View Post
Holy crap, I was getting 7 psi at 4500rpm ... I can't imagine what 15 would take =P Then again, I was on the stock exhaust as well =P
I get like 13 psi by then geez.
magnamx-5 is offline  
Old 08-23-2007, 05:00 PM
  #15  
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Oct 2006
Location: Cincinnati, OH
Posts: 375
Total Cats: 0
Default

Originally Posted by Loki047 View Post
Isnt a tony dp on sale now?
Yeah, but with a welded on cat, so the owner is unlikely to separate. I'm not much for cats, much more of a dog person
StankCheeze is offline  
Old 08-23-2007, 09:18 PM
  #16  
Boost Czar
iTrader: (62)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 76,398
Total Cats: 2,296
Default

Originally Posted by magnamx-5 View Post
I get like 13 psi by then geez.
still got the stock exhaust?
Braineack is offline  
Old 08-23-2007, 09:22 PM
  #17  
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,254
Total Cats: 2
Default

nope 2.5 inch lemme check a DL MBC is killing me i get anywhere from 12-14 psi by 4500, and i get oscilations of 1-2 psi until redline with the MBC set to 15 psi. I need to get off my *** and get inside MS to figure out this ebc, and spark ****. No cat +dynamax truboflow muffler.
magnamx-5 is offline  
Old 08-23-2007, 09:35 PM
  #18  
Boost Czar
iTrader: (62)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 76,398
Total Cats: 2,296
Default

yeah well they're talking about with the stock exhaust....i wouldn't expect anything better.
Braineack is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Full_Tilt_Boogie
Build Threads
67
03-16-2019 08:07 PM
Rick02R
WTB
3
01-03-2016 07:18 PM
Trent
WTB
2
10-01-2015 12:15 PM
FrankB
Miata parts for sale/trade
6
09-30-2015 11:48 AM


Thread Tools
Search this Thread
Quick Reply: High boost with stock downpipe, how retarded am i?


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.