Crazy bog and buck from 1000-2000rpms at take off and light cruise, fuel pressure reg - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 12-19-2013, 08:40 PM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2013
Posts: 52
Total Cats: -34
Default Crazy bog and buck from 1000-2000rpms at take off and light cruise, fuel pressure reg

Hey guys,

96 boosted miata
16g turbo
aem fic protuned
forged rods pistons
1000cc rc injectors
brand hammer new walboro 255lph
Flying miata clutch

Ok guys so the car has been protuned, ran super hard for a good while. Then one day it began to buck when I go to take off, I have to bring the rpms up to 2000rpms and roll on the clutch for it not to buck. My aem wideband reads off the scale lean when this happens then it gets where it needs to be in about 1/2 second. Also the car has a surge in random spots at part throttle cruise, when I get into boost it pulls really hard and stays 10.5-11 afr. I have noticed a pretty big drop in gas mileage also. I have boost leak tested and she is solid, replaced 02 sensor, fuel pump, fuel filter, and adjusted the tps to stock specifications.

My theory is that my walboro has begun to outflow my fpr (which is stock on 1996 with 143k on the clock). I feel like the fpr is the only part of this drivetrain that is not stock.
MeowMeowTurbo is offline   Reply With Quote
Old 03-02-2014, 10:46 AM   #2
Junior Member
Thread Starter
 
Join Date: Feb 2013
Posts: 52
Total Cats: -34
Default

if anyone has this issue it turned out to be several massive cracks in the exhaust mani covered by header wrap. I learned my lesson about that stuff.
MeowMeowTurbo is offline   Reply With Quote
Old 03-03-2014, 10:34 PM   #3
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,367
Total Cats: 1,332
Default

Might be time to learn your lesson about 1000cc injectors and piggyback management next. I'll just assume it was an eBay manifold that cracked?
Savington is offline   Reply With Quote
Old 03-03-2014, 10:51 PM   #4
Elite Member
iTrader: (2)
 
triple88a's Avatar
 
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598
Default

This will be good.

Attached Thumbnails
Crazy bog and buck from 1000-2000rpms at take off and light cruise, fuel pressure reg-george-costanza-eating-popcorn.gif  
triple88a is offline   Reply With Quote
Old 03-04-2014, 11:36 AM   #5
Junior Member
Thread Starter
 
Join Date: Feb 2013
Posts: 52
Total Cats: -34
Default

No it was a log style manifold that was on the car when I got it. I wrapped it with header wrap for about a half a year and had no clue it was leaking that bad. Needless to say I have mspnp2 in the garage. About to uninstall the fic and get this baby rolling
MeowMeowTurbo 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 59 Yesterday 09:00 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 01:13 PM.