Text only | Text with Images

Fox T-Bird/Cougar Forums

Technical => Engine Tech => Topic started by: SLEEPER T-BIRD 87 on November 28, 2005, 07:13:35 PM

Title: Mustang H.O computer in T-bird
Post by: SLEEPER T-BIRD 87 on November 28, 2005, 07:13:35 PM
Well I got my computer today. Put it in the car no more idleing problems:bowdown: but I did notice it raised the base timing 2 deg with the spout out a bit with it in.


before

12 deg out

22 deg in


now

14 deg out

30 deg in


car seems to run much better and everything including the trip minder still works. How much more agressive are the spark maps in the mustang computer? I now have detonation around 2,500 at WOT I am going to start back at base timing and go from there.:D
Title: Mustang H.O computer in T-bird
Post by: TurboCoupe50 on November 28, 2005, 09:42:48 PM
The EEC has nothing to do with base timing, set purely by the distributor...

Don't have a clue as to the actual timing curves output by the computers, but most HOs can take 13-14* advance(with premiun fuel).
Title: Mustang H.O computer in T-bird
Post by: SLEEPER T-BIRD 87 on November 28, 2005, 10:16:52 PM
Quote from: TurboCoupe50
The EEC has nothing to do with base timing, set purely by the distributor...

Don't have a clue as to the actual timing curves output by the computers, but most HOs can take 13-14* advance(with premiun fuel).






they must be alot more agressive curve. Car feels better I just need to turn the timing down some before i lean on it hard:D

At least it idles better now:flame:
Title: Mustang H.O computer in T-bird
Post by: srv1 on November 29, 2005, 06:15:42 PM
I'am a little confused. How did you put this HO computer in your SO? What else did you do?

James
Title: Mustang H.O computer in T-bird
Post by: SLEEPER T-BIRD 87 on November 29, 2005, 06:33:47 PM
Quote from: srv1
I'am a little confused. How did you put this HO computer in your SO? What else did you do?

James




19lb injectors.
Title: Mustang H.O computer in T-bird
Post by: Haystack on November 29, 2005, 08:07:19 PM
did you rewire anything, or just plug it in? I have a possible bad computer, and a SD HO puter laying around......
Title: Mustang H.O computer in T-bird
Post by: SLEEPER T-BIRD 87 on November 29, 2005, 08:15:53 PM
Quote from: Haystack
did you rewire anything, or just plug it in? I have a possible bad computer, and a SD HO puter laying around......




didnt touch a wire. swapped in the 19 lb injectors
Title: Mustang H.O computer in T-bird
Post by: Lx-tasy on November 29, 2005, 08:19:09 PM
I take it that you used the 86-88 Mustang HO computer?
Title: Mustang H.O computer in T-bird
Post by: SLEEPER T-BIRD 87 on November 29, 2005, 08:22:48 PM
Quote from: Lx-tasy
I take it that you used the 86-88 Mustang HO computer?




 speed density yep:D
Title: Mustang H.O computer in T-bird
Post by: TurboCoupe50 on November 29, 2005, 08:42:04 PM
Actually in this case you should move the pins for the injectors at the EEC plug... You have a cam with 15426378 firing orede while the injectors are firing 13726548.... But when you move the pins it confuses the EEC and causes some of the cylinders to go rich and some to go lean...

Better leave it alone and just swap in the HO cam...
Title: Mustang H.O computer in T-bird
Post by: Haystack on November 29, 2005, 08:59:58 PM
I say rewire them just to see.
Title: Mustang H.O computer in T-bird
Post by: SLEEPER T-BIRD 87 on November 29, 2005, 09:07:58 PM
Quote from: TurboCoupe50
Actually in this case you should move the pins for the injectors at the EEC plug... You have a cam with 15426378 firing orede while the injectors are firing 13726548.... But when you move the pins it confuses the EEC and causes some of the cylinders to go rich and some to go lean...

Better leave it alone and just swap in the HO cam...




yeah i need to get the cam in it:D  and the heads ... and the intake..
man i need to do alot:flame:
Title: Mustang H.O computer in T-bird
Post by: SLEEPER T-BIRD 87 on November 29, 2005, 09:08:37 PM
Quote from: Haystack
I say rewire them just to see.



I am going to leave it alone it runs a-ok as is:D
Title: Mustang H.O computer in T-bird
Post by: Sick88Tbird on November 30, 2005, 12:36:01 AM
Just a little off topic here...I had my base timing at 14* and I run on regular 87 octane everyday of the week with no problems.  Also, with the base timing set at 14* it will jump to around 36-38* with the SPOUT connector plugged in...seemed a little high to me.
Title: Mustang H.O computer in T-bird
Post by: TurboCoupe50 on November 30, 2005, 10:42:40 AM
Quote from: Sick88Tbird
Just a little off topic here...I had my base timing at 14* and I run on regular 87 octane everyday of the week with no problems.  Also, with the base timing set at 14* it will jump to around 36-38* with the SPOUT connector plugged in...seemed a little high to me.


Thats normal for the timing...

Suprised it don't ping on 87 though,consider yourself lucky...
Title: Mustang H.O computer in T-bird
Post by: Sick88Tbird on November 30, 2005, 01:59:25 PM
Yeah, I was suprised about that too.  It well run slightly better on 93 octane..but no pinging on 87.  The funning thing is that when I put my HO motor in, the distributor was cracked so I yanked it and slid my old distributor in as close as I could get it.  Once I got the car running(didn't check the timing for like 6months after-I was lazy for a while), it was dead on 10 degrees base, I cranked it to 14*, then at the track one day, I cranked it a little more...too bad my timing pointed had fallen off on my way to the track :yuck:

So, I may be giving up a little power by running too much advance... I need a timing pointer...lol.
Title: Mustang H.O computer in T-bird
Post by: V8Demon on November 30, 2005, 08:44:21 PM
Quote
Originally Posted by Sleeper T-Bird 87:

I am going to leave it alone it runs a-ok as is


It'll run better if you swap the wires and right now you run the risk of scorching a piston.
Title: Mustang H.O computer in T-bird
Post by: TurboCoupe50 on November 30, 2005, 11:40:22 PM
Quote from: Paul Flockhart
It'll run better if you swap the wires and right now you run the risk of scorching a piston.


Not from what I've read about this... According to a article on the net(shoulda bookmarked it), if the injector lead are switched to the correct firing order it will run better temporarly. What happens is the EEC tries to adjust the mixture but when it increases(or decreases) the pulsewith of the switched injectors it sees a change with a opposite cylinder, so trys to correct that one. What happens is the EEC eventually maxes out on it's corrections and part of the cylinders are 25% rich and part are 25% lean... At least with it connected as is, the EEC can accuratly adj the air/ fuel ratio...
Title: Mustang H.O computer in T-bird
Post by: Cougar5.0 on December 01, 2005, 04:08:36 AM
I thought the EEC could only adjust PW (duty cycle) on either bank (4 cylinders per O2 sensor). Not sure why changing the wiring would cause the EEC to lose it's ability to adjust air/fuel. Well, unless it gets confused as to which cylinders are part of a "bank" of 4 - hmmm, perhaps that is a problem then...
Title: Mustang H.O computer in T-bird
Post by: V8Demon on December 01, 2005, 08:02:10 AM
These cars are SEFI....I believe you are thinking of bank or batch injection.


*Edit*  Speaking of which just how would say an 88 F-150 respond if you fed it an HO cam?
Title: Mustang H.O computer in T-bird
Post by: Haystack on December 01, 2005, 09:48:58 AM
you would lose al tourqe. I gotta remember how to spell that one of these days.
Title: Mustang H.O computer in T-bird
Post by: TurboCoupe50 on December 01, 2005, 09:58:18 AM
Quote from: Paul Flockhart
These cars are SEFI....I believe you are thinking of bank or batch injection.


*Edit*  Speaking of which just how would say an 88 F-150 respond if you fed it an HO cam?


Apparently no difference... The 5.0 and 5.8 use the same two pins(58 & 59) on the EEC to fire four injectors at once. The same injectors are tied together on each engine..

Not that it applies here, but a buddy of mine just inst HO 5.0 in his 85.5 F-150(port fuel inj). With sone goodies from me, he's wired up a SEFI setup using a LSC injector harness and '87 SD Stang EEC... It runs a lot stronger than the old truck 5.0.. Working on a 5 speed swap for it now...
Text only | Text with Images