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Author
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Topic: back fire on my 86 gt
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ONEQKFIVE0
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Member # 1591
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posted
 
 
here's my set up... dss 306 short block rpm heads cane 1.7 rockers trickflow heat intake 70tb with egr stock 19 pound injectors msd 6al ok i been timming it 12 to 13 but it back fire at 4200 rpm i might just time it to stock 10 what you guys think
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03 cobra -UPR 2.80 upper pulley
-UPR idler pulley kit
-Accufab throttle body
-Diablo Sport Predator
-13 lbs. boost
-463.94 rwt / 452.18 rwhp
Posts: 235 | From: ........california ........ | Registered: Jul 2002
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FasterDamnit
Bad Attitude
Member # 442
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posted
Cam?
Fuel Pressure?
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'92 LX T5
Looked stock, went 11's 11.90 at 115mph.
'65 Mustang 347
www.fordmuscle.com
Livin' in the Carolina Pines
Posts: 2971 | From: NorCal | Registered: Sep 2001
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ONEQKFIVE0
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Member # 1591
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posted
b cam and 255 fuel pump what do you think
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03 cobra -UPR 2.80 upper pulley
-UPR idler pulley kit
-Accufab throttle body
-Diablo Sport Predator
-13 lbs. boost
-463.94 rwt / 452.18 rwhp
Posts: 235 | From: ........california ........ | Registered: Jul 2002
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ONEQKFIVE0
¯
Member # 1591
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posted
my fp is 52psi
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03 cobra -UPR 2.80 upper pulley
-UPR idler pulley kit
-Accufab throttle body
-Diablo Sport Predator
-13 lbs. boost
-463.94 rwt / 452.18 rwhp
Posts: 235 | From: ........california ........ | Registered: Jul 2002
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FasterDamnit
Bad Attitude
Member # 442
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posted
Why 52? Try 4 psi less, then carefully drive it and see if it pings.
Posts: 2971 | From: NorCal | Registered: Sep 2001
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ONEQKFIVE0
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Member # 1591
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posted
say 46 to 48psi what about timing
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03 cobra -UPR 2.80 upper pulley
-UPR idler pulley kit
-Accufab throttle body
-Diablo Sport Predator
-13 lbs. boost
-463.94 rwt / 452.18 rwhp
Posts: 235 | From: ........california ........ | Registered: Jul 2002
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FasterDamnit
Bad Attitude
Member # 442
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posted
12 should be fine.
The point is to change one thing and see what it does. If you drop fuel pressure and it gets worse, you may need to go the other way. But I bet you are rich.
Posts: 2971 | From: NorCal | Registered: Sep 2001
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FasterDamnit
Bad Attitude
Member # 442
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posted
Oh
Mass air???? I hope so. The SD will not behave well w/ the b cam.
Posts: 2971 | From: NorCal | Registered: Sep 2001
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ONEQKFIVE0
¯
Member # 1591
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posted
im running cl 73 air mass & conversion kit from CL
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03 cobra -UPR 2.80 upper pulley
-UPR idler pulley kit
-Accufab throttle body
-Diablo Sport Predator
-13 lbs. boost
-463.94 rwt / 452.18 rwhp
Posts: 235 | From: ........california ........ | Registered: Jul 2002
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FasterDamnit
Bad Attitude
Member # 442
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posted
quote:
Originally posted by DropTopFox:
get it tuned by a pro ![[patriot]](graemlins/patriot.gif)
Why? It is a very mild combo.
Posts: 2971 | From: NorCal | Registered: Sep 2001
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88gt
Custom
Member # 579
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posted
Where are you hearing the backfire? Is it from the intake or exhaust?
Posts: 1482 | From: Santa Clara/Bay area | Registered: Nov 2001
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ONEQKFIVE0
¯
Member # 1591
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posted
from the intake damn ![[Mad]](mad.gif)
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03 cobra -UPR 2.80 upper pulley
-UPR idler pulley kit
-Accufab throttle body
-Diablo Sport Predator
-13 lbs. boost
-463.94 rwt / 452.18 rwhp
Posts: 235 | From: ........california ........ | Registered: Jul 2002
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88gt
Custom
Member # 579
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posted
Usually intake backfires means you are running lean.
Posts: 1482 | From: Santa Clara/Bay area | Registered: Nov 2001
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