Bad Injectors, or granatelli mas?

FSTRDNU

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Aug 9, 2005

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Mar 13, 2006

#1

• Mar 13, 2006

• #1

i went to summit, adn bought a tfs intake manifold, and a spacer, roller rockers, and a granatelli mas air meter, tuned for cold air, and fms 24 lb injectors.
with everything except the mas and the injectors on the cars runs strong, but when i put the injectors and the mass on, the car, idle surges, and dies, and it is very slow.
what could be causing this?

 

C

criticman

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Sep 7, 2003

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Rome, GA

www.criticman.com

Mar 13, 2006

#2

• Mar 13, 2006

• #2

There is another thread where someone else has a problem with a Granatelli MAF. Maybe it's the cause?

EDIT: Actually, YOU posted that thread. Why didn't you just continue in there since you had more details posted there? For anyone else, the thread FSTRDNU started previously on this topic is here: http://forums.stangnet.com/showthread.php?t=621332&highlight=granatelli

 

1

1SLO306

My 97 GTP owns you ALL!

Mar 31, 2005

904

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Muhlenberg, ky

Mar 13, 2006

#3

• Mar 13, 2006

• #3

the maf is calibrated for the 24's right.

 

95GTV8

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Jul 25, 2005

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Washington State

Mar 13, 2006

#4

• Mar 13, 2006

• #4

i would guess out of the two that the MAF is causing the problem.
Either uncallibrated or defective/dirty.

 

FSTRDNU

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Aug 9, 2005

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Mar 13, 2006

#5

• Mar 13, 2006

• #5

the box says its for 24lb,

should the fpr vac be connected, or disconnected?

should the stock fuel pump work ok for this?

 

jrichker

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Mar 13, 2006

#6

• Mar 13, 2006

• #6

FSTRDNU said:

the box says its for 24lb,

should the fpr vac be connected, or disconnected?

should the stock fuel pump work ok for this?

Click to expand...

The stock 88 LPH fuel pump will not supply enough fuel for 24 lb injectors. MInimum size is 112 LPH. Since a 255 LHP is only a few $$$ more, most guys go with the larger size fuel pump.

Fuel pressure is best checked at idle, with the vacuum line disconnected from the regulator. Set the pressure at 39 PSI, +/- 1 PSI. Either plug the loose vacuum line or hold your finger over it so it doesn't suck air and upset the idle.

 

FSTRDNU

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Mar 13, 2006

#7

• Mar 13, 2006

• #7

that 112lph is at 100% idj i would assume?

or are you saying that the fuel pump is not enough, even at idle, and thats making my car loose 100 hp?

 

jrichker

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Mar 14, 2006

#8

• Mar 14, 2006

• #8

FSTRDNU said:

are you saying that the fuel pump is not enough, even at idle, and thats making my car loose 100 hp?

Click to expand...

No. You won't have enough fuel volume at WOT with an 88 LPH pump for 24 lb injectors.