boost drop off???? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


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

Reply
 
 
 
LinkBack Thread Tools
Old 06-07-2007, 11:26 AM   #1
I'm Miserable!
Thread Starter
 
Join Date: Jul 2006
Location: sandiego, CA
Posts: 332
Total Cats: 0
Default boost drop off????

ok i hit 9psi and then around 5500 it slowly drops back to like 7psi at around red line. is that normal or do i need a helper spring?????
drftem is offline   Reply With Quote
Old 06-07-2007, 11:52 AM   #2
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

Assuming you're using an MBC or straight up wg can - a helper spring can resolve some of that. It helps to make it adjustable (threaded rod) so you can make changes to the spring tension.
Attached Images
File Type: jpg helperspring2.jpg (71.0 KB, 59 views)
m2cupcar is offline   Reply With Quote
Old 06-07-2007, 11:55 AM   #3
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,814
Total Cats: 1,780
Default

yep normal, welcome to the GReddy kit.
Braineack is online now   Reply With Quote
Old 06-07-2007, 12:43 PM   #4
FHS
Senior Member
iTrader: (2)
 
Join Date: Oct 2004
Location: Los Angeles, Ca.
Posts: 502
Total Cats: 0
Default

Has anybody just replaced the can? I do have the helper spring and all that, but sheesh.
FHS is offline   Reply With Quote
Old 06-07-2007, 01:28 PM   #5
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,315
Total Cats: 1,913
Default

I've recently been fighting this same battle myself, in the quest for a nice, consistant 14 PSI or so. With the MBC alone, my setup typically will spike to 15 and then settle down to maybe 11 or 12. Ridiculous.

I've done a preliminary helper spring setup, but all I seem to have accomplished thus far is to move the spike upwards a bit.

I used what I felt was a moderatly sized spring, not wanting to go too tight right outta the gate. I can't really say that it helped much- I'm still spiking... Base boost (with the MBC bypassed) went from about 5.5 PSI to 9 PSI. Relatively speaking, are others using stronger springs than this?
Joe Perez is offline   Reply With Quote
Old 06-07-2007, 01:51 PM   #6
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

My helper puts my unassisted boost to abou 9psi as well.
jayc72 is offline   Reply With Quote
Old 06-07-2007, 02:13 PM   #7
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

I haven't gotten anything close to flat. I was seeing ~2psi fall after peak boost. The helper spring reduced that to just over 1psi.
dotted line = boost
m2cupcar is offline   Reply With Quote
Old 09-22-2011, 07:17 PM   #8
Junior Member
iTrader: (4)
 
Join Date: May 2009
Location: Simi valley
Posts: 203
Total Cats: -8
Default

Hook the mbc feed line to the coldside of the intercooler..
amak87 is offline   Reply With Quote
Old 09-22-2011, 07:44 PM   #9
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,165
Total Cats: 2,573
Default

took you 2 years to post your 1st post
in a 4 year old thread.

Should we expect the next post by 2017?
18psi is offline   Reply With Quote
Old 09-22-2011, 10:29 PM   #10
Elite Member
 
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12
Default

Quote:
Originally Posted by amak87 View Post
Hook the mbc feed line to the coldside of the intercooler..
lol, how is this post even possible?
dustinb is offline   Reply With Quote
Old 09-22-2011, 10:38 PM   #11
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,165
Total Cats: 2,573
Default

he will answer your question in 4 years
18psi is offline   Reply With Quote
Old 09-23-2011, 01:55 AM   #12
Junior Member
iTrader: (4)
 
Join Date: May 2009
Location: Simi valley
Posts: 203
Total Cats: -8
Default

I joined while back helping my buddy with his 91 turbo. I sold my evo 9 went with a gsxr 600 now im rocking my turbo miata.. And how can you hook up the mbc feed to the coldside of the intercooler? Just drill and tap for a 1/8npt barb in the piping after the intercoolerm before the TB.. I did it a while back and got another 1.5psi till redline..

Idk why you guys just gotta hack on someone just cuz they havent posted yet. Im not a newb. Lol ive been boostin for 5 years.. And tuning evos for the past 3.. Lets keep on topic from now on
amak87 is offline   Reply With Quote
Old 09-23-2011, 01:55 AM   #13
Junior Member
iTrader: (4)
 
Join Date: May 2009
Location: Simi valley
Posts: 203
Total Cats: -8
Default

I joined while back helping my buddy with his 91 turbo. I sold my evo 9 went with a gsxr 600 now im rocking my turbo miata.. And how can you hook up the mbc feed to the coldside of the intercooler? Just drill and tap for a 1/8npt barb in the piping after the intercoolerm before the TB.. I did it a while back and got another 1.5psi till redline..

Idk why you guys just gotta hack on someone just cuz they havent posted yet. Im not a newb. Lol ive been boostin for 5 years.. And tuning evos for the past 3.. Lets keep on topic from now on
amak87 is offline   Reply With Quote
Old 09-23-2011, 01:56 AM   #14
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,165
Total Cats: 2,573
Default

3 years oh **** you must be a tuning legend.
Everyone tunes cars here. literally like 90% of the boosted people here. tuning an evo with ecuflash/evoscan is ******* cake. I'm serious.
18psi is offline   Reply With Quote
Old 09-23-2011, 01:57 AM   #15
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,315
Total Cats: 1,913
Default

Quote:
Originally Posted by amak87 View Post
Idk why you guys just gotta hack on someone just cuz they havent posted yet.
Welcome to the jungle.
Joe Perez is offline   Reply With Quote
Old 09-23-2011, 01:59 AM   #16
Junior Member
iTrader: (4)
 
Join Date: May 2009
Location: Simi valley
Posts: 203
Total Cats: -8
Default

OAAlright man.,i never said I was the ****. Lol calm down its just the internet
amak87 is offline   Reply With Quote
Old 09-23-2011, 02:04 AM   #17
Junior Member
iTrader: (4)
 
Join Date: May 2009
Location: Simi valley
Posts: 203
Total Cats: -8
Default

Lol funny stuff
amak87 is offline   Reply With Quote
Old 09-23-2011, 02:48 AM   #18
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,638
Total Cats: 25
Default

My girlfriend tunes all my cruise and 3/4 throttle cells while I drive to the shops. So...Yah.

Dann
nitrodann is offline   Reply With Quote
Old 09-24-2011, 12:57 AM   #19
Elite Member
 
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12
Default

Quote:
Originally Posted by amak87 View Post
Lol funny stuff
Amak87, I think the thing that is most surprising is you pick a random thread, that's been dead for almost 5 years, and post a random comment in it. It's sort of like digging up a body to have sex with it, except everyone can see you doing it.
dustinb is offline   Reply With Quote
Old 09-24-2011, 05:38 PM   #20
Junior Member
iTrader: (4)
 
Join Date: May 2009
Location: Simi valley
Posts: 203
Total Cats: -8
Default

Haha ya bro... Just like raping a dead body. Spot on with that analogy.. Lol
amak87 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
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
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 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 11:30 AM.