Installed RPM Extender, questions????

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cmozez

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May 3, 2003

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16

Tupelo,Mississippi

Jun 19, 2004

#1

• Jun 19, 2004

• #1

I just installed an RPM Extender in my 94 GT that was designed for a fox. Is it normal for the car to run rough at first? The car starts and drives but it is running rough. I figured this is just normal after unhooking the computer. I had my a/f ratio at 12.5 then upped it to 13 but no change. I have only driven the car a few miles so far.

 

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cmozez

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May 3, 2003

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Tupelo,Mississippi

Jun 20, 2004

#2

• Jun 20, 2004

• #2

Anyone?

 

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cmozez

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May 3, 2003

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Tupelo,Mississippi

Jun 20, 2004

#3

• Jun 20, 2004

• #3

Come on guys. I sure some of you guys have unhooked your computer before, did it do this when you unhooked the computer?? I need some answers man.....

 

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Black70Fastback

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Dec 14, 2003

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Dyer, IN

Jun 20, 2004

#4

• Jun 20, 2004

• #4

i know when the battery gets unhooked for any long length of time it does have to re learn itself and this could very well be what you are experienceing. how many miles you put on it so far?

 

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cmozez

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May 3, 2003

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Tupelo,Mississippi

Jun 20, 2004

#5

• Jun 20, 2004

• #5

Maybe 20. It acts like the timing is all screwed up. I am going to play with that and see if it helps.

 

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Blue Coupe

New Member

Oct 31, 2003

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Oct 11, 2004

#6

• Oct 11, 2004

• #6

My understanding is the extender only works from 4000rpm & up. Also make sure to turn off the car prior to making adjustments.

 

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ProCharge94

20+ Year Stangneter

Aug 31, 2004

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7

Jax, FL

Oct 11, 2004

#7

• Oct 11, 2004

• #7

Your ECU needing time to adjust should not make your car run that rough. You may want to make sure you didn't accidentally unplug some vacuum lines or leave something still disconnected.

 

HoofnIt

Founding Member

Jan 8, 2001

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North Carolina

Oct 11, 2004

#8

• Oct 11, 2004

• #8

It is my understanding that an extender made for a FOX will NOT work on our cars. The computers are different. I think this is your problem.

 

dstanggt50

Founding Member

Sep 13, 2000

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Woodinville, WA

Oct 11, 2004

#9

• Oct 11, 2004

• #9

HoofnIt said:

It is my understanding that an extender made for a FOX will NOT work on our cars. The computers are different. I think this is your problem.

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When I bought my extender I think they asked what year, maybe the fact that it was for a fox that you are having problems?? When I connected my extender, my car might have acted funny for about 10 min, but it corrected its idle. The instructions also say that the extender doesn't operate until full throttle, or over 4000 or so rpms, ( don't remember exactly). Also, don't know if this is true for the fox extender, but the one for the 94-95 adds 4 degrees initial timing, I had some issues, backed the timing down, runs a lot better. Also, I think they even want you to run an aftermarket ignition w/it as well.

 

94CobraPace

Founding Member

Aug 30, 2000

907

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Houston, Tx.

Oct 11, 2004

#10

• Oct 11, 2004

• #10

The fox extender is different than the 94\95's & would probly make the car run bad. Did you unhook the battery when you installed it? Should have. The fox extenders take over at 4k, the 94\95 extender takes over @ 2500 rpms, I can feel mine swith when not driving hard\fast, just going over 2500 rpms & cruising.

 

OrangeMustangGt

Founding Member

Mar 7, 2002

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Cape Cod, MA

Oct 11, 2004

#11

• Oct 11, 2004

• #11

can someone tell me what that thing is, and how much?

 

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DaveB

Founding Member

Jul 13, 2002

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Middlesex and Pomona, NJ

Oct 11, 2004

#12

• Oct 11, 2004

• #12

Its a black box that plugs inbetween the ECU and main harness. It gives more aggressive fuel and timing curves, gets rid of the annoying timing retard inbetween shift, and allows you to set the a/f ratio and rev limiter. It was made by SVO back in the day (date on mine was from 95 ), but theyre not made anymore. Best bet is Ebay and classifieds. I got mine for $250 2 months ago from the Corral classifieds. A couple weeks ago though someone posted that they were selling theirs for $100.

 

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cmozez

Member

May 3, 2003

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Tupelo,Mississippi

Oct 12, 2004

#13

• Oct 12, 2004

• #13

Damn fellas, that was almost five months ago that I posted this question, I guess better late than never! Heres the skinny.... I took the extender for the fox body out and sold it and got one 94-95 specific and all was good. I am very satisfied with it.I got $280 for the fox extender on ebay and bought an sn-95 extender for $190 on ebay, I thought it would be the other way around but not so. I have a PPI ignition package on with the extender, it has really woke my car up. Highly recommended.

 

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fastf50rd

New Member

Jan 17, 2003

720

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mass.

Oct 12, 2004

#14

• Oct 12, 2004

• #14

can this be used with a supercharger? Or would the timing curve cause detonation?

 

dstanggt50

Founding Member

Sep 13, 2000

1,316

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Woodinville, WA

Oct 12, 2004

#15

• Oct 12, 2004

• #15

fastf50rd said:

can this be used with a supercharger? Or would the timing curve cause detonation?

Click to expand...

When I first started looking up info on it, the test car I read about was a 95 cobra w/a vortech. It had a boost ret. and turned timing down. I had timing set to around 14-16 s/spout out, and backed it down to about 8-10, so w/the extra timing (4 initial) from the extender, should be around my 12-14. I think though most would recommend a different type of piggyback w/more features. (maybe pms or tweecer, ect..)

 

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Black70Fastback

New Member

Dec 14, 2003

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Dyer, IN

Oct 12, 2004

#16

• Oct 12, 2004

• #16

is this anything that cant be done with a tweecer if i go that route?

what you mean that annoying timing retard in between shifts.