what is the 94 mph fuel dump in the computer?

95snoozer

New Member
Dec 14, 2002
2,571
1
0
RCR
Visit site
I read this and was like :shrug:

there is no dip in my A/F on the dyno

does it adjust for gears?or is it at a certain rpm in 4th? or is it a myth?
 
  • Sponsors(?)


QCStang

Founding Member
Mar 28, 2002
813
1
18
63
Aylmer, Quebec, Canada
95snoozer said:
I read this and was like :shrug:

there is no dip in my A/F on the dyno

does it adjust for gears?or is it at a certain rpm in 4th? or is it a myth?

If you are talking about a speed limiter, No such thing. I havew put my Stang to 240KPH (150MPH) on the speedo with 2.73 gears.

There is an electronic rev limiter though, and it is set lower on an AODE equipped car.
 

95snoozer

New Member
Dec 14, 2002
2,571
1
0
RCR
Visit site
no... somewhere there was a thread about chipping the ECU, and they said the computer would send the fuel tables rich at 93-94 mph

I dont know if this was on athe cobra computer or the 94-5 GT
 

Nobody

Founding Member
May 9, 2000
2,515
0
0
Kenmore, WA
Rim size doesn't play a part in any speed limiter because the rolling diameter of both the 16" and the 17" optional tire is the same (25.7")

I thought the only speed limiter in the Mustangs was drag :)

What I read was that they put this fuel dump only in the Cobra computer to make the car a little safer for insurance reasons. This is not a speed limiter though, it just takes the car longer to accelerate past 94mph.

Do a search for the Pro-M "Cobra finisher" this product was built to fix various 94-95 Cobra ECU issues.

http://www.pro-flow.com/Instructions/16p.htm
 

WhiteDevil

New Member
Feb 4, 2003
2,717
0
0
36
San Diego
Visit site
sixty9boss302 said:
Interesting....what is the rev limiter set on 94 manual's? I've never had the balls to find out the hard way.
Mine is like 6,250. But i think somehow some GTs are like 7,000 and some are lower like mine. I think Killercanary has the higher setting right??
 

final5-0

Mustang Master
Apr 6, 2003
6,817
13
79
DFW Texas
Visit site
95snoozer

It is no myth.

The pcm multiplies the commanded fuel ratio by a number at a determined mph to make the fuel mixture richer. In the Tweecer its called fuel enrichment for high speed.

The GT pcm (t4m0) does it fully at 127 mph

The Cobra pcm (j4j1) does it fully at 100 mph

Say the Cobra pcm is commanding a 12.5 to 1 ratio at max load

At 100 mph the pcm multiplies 12.5 by .953

This gives a new ratio of 11.9 to 1 for an enriched mixture or as some people say, the pcm dumps in fuel at high speed.

This is a basic way of explaining it but that is how it is.

Almost forgot to say to you, GOOD JOB on breaking into the 12's :nice:

Later
Grady
 

mytight95

Active Member
Apr 11, 2003
2,605
0
46
40
Dothan,Al
Visit site
hey snoozer i tried to download your vid of your 12.95 pass, and had no luck when you say stock heads do you mean that they are untouched or are they ported in any kind of way, and was that pass on slicks or what.

just curious

jason
 

95snoozer

New Member
Dec 14, 2002
2,571
1
0
RCR
Visit site
final5-0 said:
95snoozer

It is no myth.

The pcm multiplies the commanded fuel ratio by a number at a determined mph to make the fuel mixture richer. In the Tweecer its called fuel enrichment for high speed.

The GT pcm (t4m0) does it fully at 127 mph

The Cobra pcm (j4j1) does it fully at 100 mph

Say the Cobra pcm is commanding a 12.5 to 1 ratio at max load

At 100 mph the pcm multiplies 12.5 by .953

This gives a new ratio of 11.9 to 1 for an enriched mixture or as some people say, the pcm dumps in fuel at high speed.

This is a basic way of explaining it but that is how it is.

Almost forgot to say to you, GOOD JOB on breaking into the 12's :nice:

Later
Grady
thanks for the explanation

I will worry about that when I trap 127 :rlaugh:
 

95snoozer

New Member
Dec 14, 2002
2,571
1
0
RCR
Visit site
mytight95 said:
hey snoozer i tried to download your vid of your 12.95 pass, and had no luck when you say stock heads do you mean that they are untouched or are they ported in any kind of way, and was that pass on slicks or what.

just curious

jason
not ported at all

the vid was of the 13.1 on nittos on a 1.92 60'

my 12.95 was not taped :nonono: and was odne on M&H muscle car drag tire
305/40/16 .... an 11.4 inch DOT slick made for a 7 inch rim. Its like an ET street, but it seems alot more stable and less squirley than my old 10.5 ET streets

Pass was made full street trim/interior on stock ponies, drove to the track ran it drove home

yes its light
 
Thread starter Similar threads Forum Replies Date
5 et/mph gain by removing timing retard and fuel dump in a 94 cobra? 1994 - 1995 Specific Tech 0
A Rattling Noise Above 45 mph 1994 - 1995 Specific Tech 1
I Car will not go over 54 mph 1996 - 2004 SN95 Mustang -General/Talk- 3
C Transmission grenaded at 80 mph!!! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 22
Mstng93SSP SOLD 140 MPH Gauge Cluster SOLD Interior Exterior Parts 2
BlakeusMaximus Interior and Upholstery 140 Mph Ford Motorsport Guage On 88 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 5
Boosted92LX 208 Mph Police Chase 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
R Speedo Over 150mph When Traveling At 50 Mph??? SN95 4.6L Mustang Tech 2
Cobruh 97 Cobra With 70 Mph Vibration. Any Ideas? 1996 - 2004 SN95 Mustang -General/Talk- 18
B 94 T5 Fresh Rebuild Wont Downshift Into 2nd Or 1st Untill Below 10 Mph 1994 - 1995 Specific Tech 5
v8stang289 Updated: 1st Run In 86 Gt, Low Mph (in My Opinion) Any Ideas? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 32
G Vibration @ 40 Mph SN95 4.6L Mustang Tech 7
Paul G Vibration At 70 Mph 2005 - 2009 Specific Tech 7
B Expired For Sale: 140 Mph And 160 Mph Dash Clusters Interior Exterior Parts 1
J Expired 1988 160 Mph Speedometer Interior Exterior Parts 0
Auto Reverse Is This Et Slow For My Mph? Fox 5.0 Mustang Tech 6
Jace78 What Is Your Mph At The Top Of 2nd Gear? Fox 5.0 Mustang Tech 15
aar0s Tired Of Your 85 Mph Speedo? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
TexasFireman SOLD Fs/trade: 87-89 Motorsports 160 Mph Speedo Interior Exterior Parts 4
slayerripkdc Which car would have the higher trap mph? SN95 4.6L Mustang Tech 6
L 1/8 mile in 8.29 @ 87 mph with a 2.05 60' 2005 - 2014 S-197 Mustang -General/Talk- 10
S TWO 90-93 Fox 140 MPH Speedo Guage Clusters Interior Exterior Parts 3
1 No power after 40 mph Fox 5.0 Mustang Tech 6
LokisTyro98SE6 '96 GT pings over 30 MPH SN95 4.6L Mustang Tech 4
J 160 MPH SSP gauge question.. Fox 5.0 Mustang Tech 4
O 87-89 fox speedometer in a 91 cluster? 180 MPH 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
merc123 Vibration at 90+ MPH SN95 4.6L Mustang Tech 25
O 99 cobra mph gauge not working?????? SVT Tech Forum 7
GoBabyVroommm My 97 cobra 1/4 mile/ lil confused w/mph 1996 - 2004 SN95 Mustang -General/Talk- 16
Cobra912 New Best ET/MPH 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 70
ashford bad bucking below 40 mph during cruise. Fox 5.0 Mustang Tech 5
S What's the deal with MPH? 1996 - 2004 SN95 Mustang -General/Talk- 6
99FiveOh SN95 150 MPH Instrument Cluster 94-97 Interior Exterior Parts 0
93SALEEN SC FS fox 200 mph gauge cluster Interior Exterior Parts 2
R 1979-1986 Mustang 140 MPH SPEEDO Interior Exterior Parts 2
slayerripkdc 125 wet shot MPH??? 1996 - 2004 SN95 Mustang -General/Talk- 3
ImportSlayer347 Vibration at 60+ mph in driveline Fox 5.0 Mustang Tech 8
W 140 mph gauge cluster Fox 5.0 Mustang Tech 5
T First time out... Edel E-force runs 11.6's at 117 MPH 2005 - 2009 Specific Tech 16
M MPH/speedometer fix. 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 0
O Tire/gear ratio = MPH 2005 - 2014 S-197 Mustang -General/Talk- 4
d.r.moss 190 kph to 140 mph Fox 5.0 Mustang Tech 8
ADRENLN The Best Blower Cams! MPH of Hitech Stage II's 1996 - 2004 SN95 Mustang -General/Talk- 21
onefstsnake Bad Vibration at 70+ MPH Fox 5.0 Mustang Tech 32
xtweakerx New Personal Best on E.T and MPH. 2005 - 2014 S-197 Mustang -General/Talk- 18
chefster 1 degree f ,40 mph gusts 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 12
S 1986 170 mph speedometer 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 16
J MPH 4 inch powerpipe on procharger? SN95 4.6L Mustang Tech 1
Venom351R For The Mods I did How Much of An Improvment Is My MPH? 1994 - 1995 Specific Tech 4
Cobra912 Check out my car pic - drag day 12.24 @ 113 mph 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
Similar threads