unable to turn boost up - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 11 Old 05-23-2007, 10:47 PM Thread Starter
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unable to turn boost up

ok guys i have a hellion kit on a 90 coupe w/5 pound spring in waste gate. the problem i have when i turn up boost the valves ratter. i have 42 pound injectors in a stock block w/afr 165 heads and cobra intake also a matching mass air meter. i thought with everything matching i can just set timing and will be able to get 12psi, but its not happening. i got a tweecer r/t just need some advice why car not running on mass air meter with timing set at 21 degrees. thanks ron

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post #2 of 11 Old 05-24-2007, 08:21 AM
 
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Sounds like it's not the valves rattlin', sounds like detonation.....

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post #3 of 11 Old 05-24-2007, 12:47 PM
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Watch out for detonation! You better check your tune before upping the boost. You are courting disaster.
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post #4 of 11 Old 05-24-2007, 01:04 PM
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What cam are you running? If your cam is opening the exhausrt valves to soon you will not be able to turn your boost up. It could also be detonation aswell
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post #5 of 11 Old 05-24-2007, 02:07 PM
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Pull out spout, set base timing to 10*, adjust WOT Spark Advance vs. RPM Function - set to desired total timing 2500rpm+, put spout back in.

Also, you can get by with pulling the spout and setting your total timing. Do not re-install spout. If I were you I wouldn't go above 18* total timing until you know what your air/fuel ratio is doing on the car.

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post #6 of 11 Old 05-26-2007, 11:51 PM Thread Starter
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the car has a stock cam the only thing different is heads, turbo kit and cobra intake w/42lbs njectors
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post #7 of 11 Old 05-27-2007, 12:00 AM
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What size fuel pump do you have?

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post #8 of 11 Old 05-27-2007, 06:01 AM Thread Starter
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has a 255 pump stock fuel rails
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post #9 of 11 Old 05-27-2007, 06:39 PM
 
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Quote:
Originally Posted by smokinnitto View Post
has a 255 pump stock fuel rails
You need to add another in-line fuel pump to compliment the 255 in-tank....Like a T-rex or something.....Then calm down on the timing a bit....Try it at 18* total.....
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post #10 of 11 Old 05-27-2007, 07:50 PM
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21* of timing is fine for 5psi. When you force more air into the chamber without adding more fuel (tune) you get a lean condition which equals detonation. Drop the timing like mentioned and re-tune it.

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post #11 of 11 Old 05-28-2007, 10:31 PM Thread Starter
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will try and get back on results
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