Slow 5.0?

90'5.0 Conv · 07-23-2001, 05:36 PM

I have a stock 90 GT convertible that I just to the local 1/8 mile track and ran a BEST 11.60 at 69mph. What a dissapointment? The car seems to run great. Timming is at 13 degrees and air silencer has been removed. Should i be seriously dissapointed or what. Any advice or related problems much appreciated Thanks

Mr 5 0 · 07-23-2001, 06:10 PM

That 11.60 translates to an 18 second (@ 86 mph) quarter-mile et, and you should be running a 15-something, so yes, you should be 'seriously disappointed'.

Just some random thoughts:

You didn't say if the GT is an AOD or a T-5 but either way, your launch and shifting could be part of the problem, especially if it's a 5-speed.

If you have the automatic, you could have a slipping tranny; if a T-5. you could have shifted too soon or have a slipping clutch.

I would consider a complete tune-up and bump that initial timing to 14 while you're at it.

[This message has been edited by Mr 5 0 (edited 07-23-2001).]

90'5.0 Conv · 07-23-2001, 06:56 PM

Sorry, failed to mention it was an AOD Tranny but the tranny shifts very firm. I just tuned it up about 2 months ago (platinum+4,s ,ford racing 9 mm plug wires, changed the oil ,cleaned the throttle body, tranny fluid and rotor cap. It is a convertible, Am I just carrying too much weight or should I be looking elsewhere for excuses?

Stang Runner · 07-23-2001, 07:02 PM

It is not your weight you should be 15's How is your air filter. Are your plugs gaped right was your A/C on??

[This message has been edited by Stang Runner (edited 07-23-2001).]

90'5.0 Conv · 07-23-2001, 07:07 PM

The plugs are supposedly already gapped I suppose (platinum+4,s) Can you even change the gap on these plugs and no my a/c wasn't on. It does'nt even work righ now. I also failed to mention the cats are gutted and I have 2 chamber flowmasters. That shouldn't slow me down though should it?

[This message has been edited by 90'5.0 Conv (edited 07-23-2001).]

Stang Runner · 07-23-2001, 07:15 PM

It should run faster than that..... I dont know what it could be does it not have power when the RPS go up? Maybe bad cats are you running 91 or higher gas in it?

90'5.0 Conv · 07-23-2001, 07:24 PM

Had a feeling that would be the next question but that isn't it. I was running 93 Octane like I always do and the car didn't hesitate or miss at all. Never has , seems to run strong too me but the race track doesn't agree I guess. I' m constantly getting beat against other mustangs. Lost to a white 88 LX conv. by .400s of a second. Gas tank was about 1/2 full. Somebody please help.

SlowStang2 · 07-23-2001, 07:44 PM

Sell it. Buy another one.

------------------
94' Stang GT Convertible --Cobra upper&lower, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s 14.4@100. (Sad, i know. i have stock heads)

LincoConti87 · 07-23-2001, 07:53 PM

Do you know how to shift the automatic for racing? Do you know how to stage and use the tree correctly? I know those aod verts are supposed to be slow but if everything is working good I think its just yer driving...I mean I should hit 17's with my stock 4000 pound Lincoln with 150 horse 5.0...I think yer driving is the prob

Stang Runner · 07-23-2001, 08:10 PM

What is your altitude there??

Unit 5302 · 07-23-2001, 08:51 PM

That car should NEVER run into the 16's even. Where are you shifting? Leaving it in drive?

60ft time? Your mph is maybe 5 low.

Stang Runner · 07-23-2001, 09:29 PM

Your slow stang will kill my old 81 AMC Eagle with a 74 258CU 6S I did a 1/4 in 19.9@59MPH I was a bit over 4700lbs The guys at work thought I was crazy to drive it it would did 6 or 7 times before I could move.

ronny50 · 07-24-2001, 08:35 AM

What RPM's are you shifting at?

------------------
1990 GT 5k Original miles!!
Ripper,Pullies,73 MM C&l Mass Air,8mm Wires,Piaa Headlights,MAC Cold Air (Fender)

07-24-2001, 09:49 AM

How many times did you run? I would have had to make several passes to make sure the time was right.

In any case, should run much better.

What gear are your running in the car?

dinomite · 07-24-2001, 10:06 AM

There must be somethin wrong, cause even if you were to spin the launch and let the transmission shift itself, that would be at worst a low 16. If you TPS was HORRIBLY off, it might lead to this, if the computer never saw you putting down WOT. When you let the tranny shift itself (leave it in "D") where does it shift if you keep it floored? As you can see from my sig, i have the exact same car as you, with simple mods and run a 15.2@92, so something is obviously wrong. I can also give you my generic AOD shifting response:

you like dancin? you better, cause its time for...The AOD Shuffle!

ok, start by putting your car into 1 (alllll the way down). put your left foot on the brake, and use your right foot to bring the revs to 13-1500, or until the tires spin (takes some practice). when you are ready to go (don't sit like that too long, it will burn up your converter) release the brake and depress the throttle fully, you'll have to practice to find how quickly you can do this. when the revs hit 4800, push the "gear selector lever" up one notch (to the "D" position). the tranny takes about 300 rpm to shift, and once it has fully shifted, and you've waited a second (don't go to early), press the button and pull it BACK to the "1" position. when the revs hit 4800 again, put it in "D" and leave it there. finally, when they hit 4800 put it into "OD", but by that time you will really be movin....i do the entire 1/4 in 2 gears, going just out of the powerband on my 90LX convert.

a stock mustang stops making power at about 5100ish, so given it takes 300 rpm for the anchor to shift, you move the shifter at 4800. your AOD has 4 gears, the "1" position only lets the tranny use first gear, the "D" position lets it use the first 3 (1,2,3 DUH!) and the "OD" position lets it use all 4. the problem is that if you let the transmission shift itself, it does so a few hundred rpm too early, this is worth a couple tenths in the 1/4. the other problem is that you only have a distinct position for 1st gear (the "1" position), and the first 3 (the "D" position). in order to keep it in 2nd gear till the perscribed rpm, you have to bring the shifter back to the "1" position, after letting it shift (by moving it from "1" to "D" and then back to "1"). Cause you have to do so much fancy work, i call this manuver the aod shuffle. now, be careful when you are shifting into 2nd gear that you put it in the "D" position and leave it there long enough that it is completely done, before you bring it back to "1" otherwise it will downshift to 1st and that would be bad. if you ever feel quesy about doing this, just push the shifter forward as far as you can (WITHOUT pushing the button) and it will stop at "OD" (at least mine does, it might go all the way to "N", that'd be ok too. just don't press the button when you do that, cause it will go to "R" or "P", then you would be looking for a new tranny).

------------------
90LX AOD Convertable: Lakewood control arms, FMS springs.
Best 1/4: 15.277@92.25 (2.27 60')
AIM: dinomite1, roadracestang
dinomite@softhome.net

dinomite · 07-24-2001, 10:10 AM

a couple other things, those fancy spark plugs do nothing, just get a set of autolites (stock style). also, do you have all your timeslips (with 60', 330', and etc.)? cause if you do, i can compare them to mine, and pinpoint when your engine gives up.

hoofbeat · 07-24-2001, 02:14 PM

I wouldn't recommend using that 1, 2, 3, shift for long, it will blow your tranny up. I recommend getting a recalibrated valve body from Lentech or P.A. That way you won't trash your tranny. Then I would get a looser converter and some gears,(with an a.o.d. I would go with 4.10) other than that you may just need to see what r.pm your crossing the line at, that m.p.h. is way too low.

07-24-2001, 04:37 PM

Wanna race my '01 Toyota Echo? j/k.....there's obviously something SERIOUSLY wrong. Platinum plugs are crap - ditch them. The gaps may be wrong. You sure it wasn't a 1/4 mile track?

------------------
'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; JMS Chip; 190 lb fp; TFS track heat Intake (12.299 @ 113)

90'5.0 Conv · 07-24-2001, 05:11 PM

Hey fellas, made a mistake in my typing, It was a 10.6 at 69mph, but that still converts to a high 16. Sorry for the mistake but isn't that still pretty slow?

[This message has been edited by 90'5.0 Conv (edited 07-24-2001).]

David Fulford · 07-24-2001, 08:12 PM

I'd say that's about right. Especially if it's your first time at the track.

07-23-2001, 05:36 PM	#1
90'5.0 Conv Long time member in and out Join Date: Jul 2001 Location: Albany, Ga Posts: 343	Slow 5.0? I have a stock 90 GT convertible that I just to the local 1/8 mile track and ran a BEST 11.60 at 69mph. What a dissapointment? The car seems to run great. Timming is at 13 degrees and air silencer has been removed. Should i be seriously dissapointed or what. Any advice or related problems much appreciated Thanks

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07-23-2001, 06:10 PM	#2
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	That 11.60 translates to an 18 second (@ 86 mph) quarter-mile et, and you should be running a 15-something, so yes, you should be 'seriously disappointed'. Just some random thoughts: You didn't say if the GT is an AOD or a T-5 but either way, your launch and shifting could be part of the problem, especially if it's a 5-speed. If you have the automatic, you could have a slipping tranny; if a T-5. you could have shifted too soon or have a slipping clutch. I would consider a complete tune-up and bump that initial timing to 14 while you're at it. [This message has been edited by Mr 5 0 (edited 07-23-2001).]

07-23-2001, 06:56 PM	#3
90'5.0 Conv Long time member in and out Join Date: Jul 2001 Location: Albany, Ga Posts: 343	Sorry, failed to mention it was an AOD Tranny but the tranny shifts very firm. I just tuned it up about 2 months ago (platinum+4,s ,ford racing 9 mm plug wires, changed the oil ,cleaned the throttle body, tranny fluid and rotor cap. It is a convertible, Am I just carrying too much weight or should I be looking elsewhere for excuses?

07-23-2001, 07:02 PM	#4
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	It is not your weight you should be 15's How is your air filter. Are your plugs gaped right was your A/C on?? [This message has been edited by Stang Runner (edited 07-23-2001).]

07-23-2001, 07:07 PM	#5
90'5.0 Conv Long time member in and out Join Date: Jul 2001 Location: Albany, Ga Posts: 343	The plugs are supposedly already gapped I suppose (platinum+4,s) Can you even change the gap on these plugs and no my a/c wasn't on. It does'nt even work righ now. I also failed to mention the cats are gutted and I have 2 chamber flowmasters. That shouldn't slow me down though should it? [This message has been edited by 90'5.0 Conv (edited 07-23-2001).]

07-23-2001, 07:15 PM	#6
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	It should run faster than that..... I dont know what it could be does it not have power when the RPS go up? Maybe bad cats are you running 91 or higher gas in it?

07-23-2001, 07:24 PM	#7
90'5.0 Conv Long time member in and out Join Date: Jul 2001 Location: Albany, Ga Posts: 343	Had a feeling that would be the next question but that isn't it. I was running 93 Octane like I always do and the car didn't hesitate or miss at all. Never has , seems to run strong too me but the race track doesn't agree I guess. I' m constantly getting beat against other mustangs. Lost to a white 88 LX conv. by .400s of a second. Gas tank was about 1/2 full. Somebody please help.

07-23-2001, 07:44 PM	#8
SlowStang2 Registered Member Join Date: May 2001 Location: Stuart, FL, US Posts: 147	Sell it. Buy another one. ------------------ 94' Stang GT Convertible --Cobra upper&lower, Mac cold air w/K&N, BBK equal length shorties, BBK offroad H-pipe, American Thunder cat-back, BBK T/B 65mm, 24lb injectors, Pro-77mm MAM, pulleys, aluminum driveshaft, 3.55s 14.4@100. (Sad, i know. i have stock heads)

07-23-2001, 07:53 PM	#9
LincoConti87 Registered Member Join Date: Dec 2000 Location: Tallahassee,Florida,USA Posts: 188	Do you know how to shift the automatic for racing? Do you know how to stage and use the tree correctly? I know those aod verts are supposed to be slow but if everything is working good I think its just yer driving...I mean I should hit 17's with my stock 4000 pound Lincoln with 150 horse 5.0...I think yer driving is the prob

07-23-2001, 08:10 PM	#10
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	What is your altitude there??

07-23-2001, 08:51 PM	#11
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	That car should NEVER run into the 16's even. Where are you shifting? Leaving it in drive? 60ft time? Your mph is maybe 5 low.

07-23-2001, 09:29 PM	#12
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	Your slow stang will kill my old 81 AMC Eagle with a 74 258CU 6S I did a 1/4 in 19.9@59MPH I was a bit over 4700lbs The guys at work thought I was crazy to drive it it would did 6 or 7 times before I could move.

07-24-2001, 08:35 AM	#13
ronny50 Registered Member Join Date: May 2001 Location: madison, WI Posts: 70	What RPM's are you shifting at? ------------------ 1990 GT 5k Original miles!! Ripper,Pullies,73 MM C&l Mass Air,8mm Wires,Piaa Headlights,MAC Cold Air (Fender)

07-24-2001, 09:49 AM	#14
stanglx347 Guest Posts: n/a	How many times did you run? I would have had to make several passes to make sure the time was right. In any case, should run much better. What gear are your running in the car?

07-24-2001, 10:06 AM	#15
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	There must be somethin wrong, cause even if you were to spin the launch and let the transmission shift itself, that would be at worst a low 16. If you TPS was HORRIBLY off, it might lead to this, if the computer never saw you putting down WOT. When you let the tranny shift itself (leave it in "D") where does it shift if you keep it floored? As you can see from my sig, i have the exact same car as you, with simple mods and run a 15.2@92, so something is obviously wrong. I can also give you my generic AOD shifting response: you like dancin? you better, cause its time for...The AOD Shuffle! ok, start by putting your car into 1 (alllll the way down). put your left foot on the brake, and use your right foot to bring the revs to 13-1500, or until the tires spin (takes some practice). when you are ready to go (don't sit like that too long, it will burn up your converter) release the brake and depress the throttle fully, you'll have to practice to find how quickly you can do this. when the revs hit 4800, push the "gear selector lever" up one notch (to the "D" position). the tranny takes about 300 rpm to shift, and once it has fully shifted, and you've waited a second (don't go to early), press the button and pull it BACK to the "1" position. when the revs hit 4800 again, put it in "D" and leave it there. finally, when they hit 4800 put it into "OD", but by that time you will really be movin....i do the entire 1/4 in 2 gears, going just out of the powerband on my 90LX convert. a stock mustang stops making power at about 5100ish, so given it takes 300 rpm for the anchor to shift, you move the shifter at 4800. your AOD has 4 gears, the "1" position only lets the tranny use first gear, the "D" position lets it use the first 3 (1,2,3 DUH!) and the "OD" position lets it use all 4. the problem is that if you let the transmission shift itself, it does so a few hundred rpm too early, this is worth a couple tenths in the 1/4. the other problem is that you only have a distinct position for 1st gear (the "1" position), and the first 3 (the "D" position). in order to keep it in 2nd gear till the perscribed rpm, you have to bring the shifter back to the "1" position, after letting it shift (by moving it from "1" to "D" and then back to "1"). Cause you have to do so much fancy work, i call this manuver the aod shuffle. now, be careful when you are shifting into 2nd gear that you put it in the "D" position and leave it there long enough that it is completely done, before you bring it back to "1" otherwise it will downshift to 1st and that would be bad. if you ever feel quesy about doing this, just push the shifter forward as far as you can (WITHOUT pushing the button) and it will stop at "OD" (at least mine does, it might go all the way to "N", that'd be ok too. just don't press the button when you do that, cause it will go to "R" or "P", then you would be looking for a new tranny). ------------------ 90LX AOD Convertable: Lakewood control arms, FMS springs. Best 1/4: 15.277@92.25 (2.27 60') AIM: dinomite1, roadracestang dinomite@softhome.net

07-24-2001, 10:10 AM	#16
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	a couple other things, those fancy spark plugs do nothing, just get a set of autolites (stock style). also, do you have all your timeslips (with 60', 330', and etc.)? cause if you do, i can compare them to mine, and pinpoint when your engine gives up.

07-24-2001, 02:14 PM	#17
hoofbeat Registered Member Join Date: Aug 2000 Location: n.c. Posts: 15	I wouldn't recommend using that 1, 2, 3, shift for long, it will blow your tranny up. I recommend getting a recalibrated valve body from Lentech or P.A. That way you won't trash your tranny. Then I would get a looser converter and some gears,(with an a.o.d. I would go with 4.10) other than that you may just need to see what r.pm your crossing the line at, that m.p.h. is way too low.

07-24-2001, 04:37 PM	#18
bada$$lx Guest Posts: n/a	Wanna race my '01 Toyota Echo? j/k.....there's obviously something SERIOUSLY wrong. Platinum plugs are crap - ditch them. The gaps may be wrong. You sure it wasn't a 1/4 mile track? ------------------ '90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts); 30# injectors; JMS Chip; 190 lb fp; TFS track heat Intake (12.299 @ 113)

07-24-2001, 05:11 PM	#19
90'5.0 Conv Long time member in and out Join Date: Jul 2001 Location: Albany, Ga Posts: 343	Hey fellas, made a mistake in my typing, It was a 10.6 at 69mph, but that still converts to a high 16. Sorry for the mistake but isn't that still pretty slow? [This message has been edited by 90'5.0 Conv (edited 07-24-2001).]

07-24-2001, 08:12 PM	#20
David Fulford Registered Member Join Date: Oct 2000 Location: Charlotte NC Posts: 193	I'd say that's about right. Especially if it's your first time at the track.