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post #1 of 12 Old 05-08-2007, 04:24 AM Thread Starter
 
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newby question

hows it going my name is joe and im new to the corral and i have a 1980
mustang with a home made turbo sys and i have ran in to a problem,
basicly 1st and 2nd gear pull fine,and once i gat in 3rd or 4th the power
surges real bad above 3800rpm.im running 10lbs of boost,my current set up
has #42injectors,spyder efi intake,custom cam,ported 289heads,aeromotive
fuel sys,and a 62-1,and i know the car needs to be tunned but my worry
is it could be something else,cause i dont want to pay $500 if i cannot be
tuned any suggestions would be highly appricated

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post #2 of 12 Old 05-09-2007, 02:51 PM
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I had something like that when a fuel pump was going. How is your fp during those gears?
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post #3 of 12 Old 05-09-2007, 05:41 PM Thread Starter
 
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fuel pressure is 40psi,i dont have a vacume line hooked to my regulator
cause it runs like crap around town,but under boost it dosent help.
i have an aeromotive by pass regulator that refrinces boost.,one
thing i thought of is i have A fuel filter before my a1000 pump because i have
a fuel cell with that blue foam tha comes apart. im thinking it might have
cloged,i never noticed any thing when the car was N/A,but then again now
it requires a lot more fuel.
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post #4 of 12 Old 05-10-2007, 07:28 AM
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I would check that. When my fuel pump was going (or if yours has a clog somewhere), it would be fine under all conditions except for the track. So hit the gas on the street, it would go great. But at the track with the pedal on the floor thru the gears, something nasty would happen starting 3rd gear. Getting used to the power etc, I was mostly looking down the track, not at gauges. Finally, I looked at the fp gauge. It would rise at first but then under load, it would come back down in 3rd and 4th! I wound up getting boost into the coolant and had to go with studs for the heads.
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post #5 of 12 Old 05-10-2007, 02:06 PM Thread Starter
 
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the fuel filter was pretty nasty but still no change.i think the car just needs
a tune real bad,but i did wide band it and my air fuel is nasty im not driving the car untill tuned air/fuel between 16-22 under 10 psi boost 3rd and 4th.
im pretty sure my pumps still good it only has 500 miles on it.so time to scrounge up some money,no 50 ft smokeshows for a while
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post #6 of 12 Old 05-10-2007, 02:27 PM
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Is the car speed density? A variety of problems could also stem from the dealing of speed density. Map sensor...etc

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post #7 of 12 Old 05-10-2007, 02:40 PM
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You MUST run a vacuum line to your fuel pressure regulator! Without it your fuel pressure will not increase while under boost and you likely will do some damage due to detonation.

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post #8 of 12 Old 05-11-2007, 02:09 AM Thread Starter
 
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my car is mass air and im running a c&l 80mm calibrated for my injectors
i removed my fuel filter temporarly due to it being nasty but i havent been
able to put enough load on the motor to see if any thing has changed
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post #9 of 12 Old 05-11-2007, 08:42 AM
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what kind of fuel pump are you running?? At a minimum you should be running a high volume intank 255. Since you haven't tuned it and can't monitor your A/F, is the MAF a supercharged curve or N/A curve?? And yes you should have that vacuum line attached.

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post #10 of 12 Old 05-12-2007, 10:02 PM
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Could you list a few more mods you have done. Size of exhaust side on turbo?


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post #11 of 12 Old 05-14-2007, 03:31 AM Thread Starter
 
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what kind of fuel pump are you running?? At a minimum you should be running a high volume intank 255. Since you haven't tuned it and can't monitor your A/F, is the MAF a supercharged curve or N/A curve?? And yes you should have that vacuum line attached.


ok my fuel system consits of a 10 gal fuel cell with -10 line running to an aeromotive a1000 pump then goes from the pump to a y block -8 line,then runs into my rails,and out the other end it runs to my by pass regulator,from
there back to my fuel cell.i did have an inovate lm1 on the car at one point
and under boost in 3rd and 4th my air fuel is all over the place some times as high as 17 but 1st and 2nd it sits at about 11.and my mass air is just an out of the box unit and stock electronic mass air is a c&l.

Could you list a few more mods you have done. Size of exhaust side on turbo?

exuast housing on my turbo is a .96 ar,the turbo is a turbonetics 62-1.
i have a custom ground cam from a locall cam grinder,ported 289 heads
with 53cc chambers,spyder efi intake,stock short block,42lbs inj,70mm tb
80mm maf,plus the fuel syst above for the most part thats the major stuff
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post #12 of 12 Old 05-14-2007, 03:39 AM Thread Starter
 
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just remembered that my base timming is set at 10 deg btdc.total timing unknown spout connetor is pluged in,and also fp is at 40 psi.
should i disconnect the spout and bump my timing up to 18-20 deg
and just leave out the plug?
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