306 first time out, thoughts? - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 28 Old 05-07-2016, 10:59 PM Thread Starter
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306 first time out, thoughts?

8.2 @ 88mph 1/8 mile. Crappy 2.1 sixty .
26 Mickey T street tires
Car bogged off line, ( think I need jet exts.) Then spun before it got moving .
Plan on having 28" slicks next time out.
Setup:
306 ,canfield 192 heads, vic jr intake , tfs 2 cam, 750 dp, 4:88 gears, powerglide, unknown stall but on the trans brake it stalls at 5 grand.

Lakewood susp all around , uppers and lowers. This was really just a thrown together combo.

Thoughts on potential ?

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post #2 of 28 Old 05-07-2016, 11:00 PM Thread Starter
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In a 93 coupe.

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post #3 of 28 Old 05-08-2016, 08:39 AM
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A lot of more knowledgeable guys on here than me, but sounds like some shock adjustments are needed to b help keep the tires planted. Also, I have always thought of a power glide being more for high HP cars. Do you make enough power to be working with only 2 gears?

Overall, considering the combo and 60ft, the times sound fairly decent.

Joe

93 GT w/ 331
Bottom of the Barrel Budget
Working on the 60ft, thanks Kevin Slaby!
1.57 60ft and 7.45 @ 92.19, Previous best 60ft was 1.83.
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post #4 of 28 Old 05-08-2016, 09:17 AM
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So, are you leaving on the trans brake at 5,000 rpm? Or are you using a 2-step, and if so what rpm are you letting go of the trans brake button? Do you know where the instant center is? What air pressure in the tires? If the tires are too low on pressure, you can dead hook and then go into tire spin.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #5 of 28 Old 05-08-2016, 09:44 AM Thread Starter
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Quote:
Originally Posted by StrokedFox View Post
A lot of more knowledgeable guys on here than me, but sounds like some shock adjustments are needed to b help keep the tires planted. Also, I have always thought of a power glide being more for high HP cars. Do you make enough power to be working with only 2 gears?

Overall, considering the combo and 60ft, the times sound fairly decent.

Joe
Yeah the shocks may be bad.they are older 50/50s. Probably going to get some strange single adjustable. And for the glide, I got it cheap and the plan is to bracket race. Thus consistent. I've read and been told the same thing about glides needing the higher hp, but I've also been told its a myth by knowledgeable people. Who knows .
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post #6 of 28 Old 05-08-2016, 09:48 AM Thread Starter
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Originally Posted by StrokedFox View Post
A lot of more knowledgeable guys on here than me, but sounds like some shock adjustments are needed to b help keep the tires planted. Also, I have always thought of a power glide being more for high HP cars. Do you make enough power to be working with only 2 gears?

Overall, considering the combo and 60ft, the times sound fairly decent.

Joe
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Originally Posted by Saleen414 View Post
So, are you leaving on the trans brake at 5,000 rpm? Or are you using a 2-step, and if so what rpm are you letting go of the trans brake button? Do you know where the instant center is? What air pressure in the tires? If the tires are too low on pressure, you can dead hook and then go into tire spin.
First two passes off foot brake. Last pass off stall at 5 grand with tire pressure at 20lbs. I have a msd 6Al box , not sure if it has the 2 step. What exactly does the 2 step do? And no, dnt know the instant center. One of the things I need to get sorted out. Thanks .
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post #7 of 28 Old 05-08-2016, 09:56 AM
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A two step is a rev limiter. As an example, in my car the converter will stall to around 5,500 rpm. I have the 2-step set to 2,600 rpm. So when I stage the car and hold the trans brake button, with the gas pedal matted to the floor, the engine is rev limited to 2,600 rpm. When I release the trans brake button, the converter flashes to 5,500 rpm and off I go.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #8 of 28 Old 05-08-2016, 10:48 AM Thread Starter
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A two step is a rev limiter. As an example, in my car the converter will stall to around 5,500 rpm. I have the 2-step set to 2,600 rpm. So when I stage the car and hold the trans brake button, with the gas pedal matted to the floor, the engine is rev limited to 2,600 rpm. When I release the trans brake button, the converter flashes to 5,500 rpm and off I go.
Oh ok I got you. What is the advantage to that as opposed to just going off at 5500?
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post #9 of 28 Old 05-08-2016, 03:21 PM
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Oh ok I got you. What is the advantage to that as opposed to just going off at 5500?
Getting the converter to "flash" can have an impact on how hard or soft the tires are hit on launch. A torque converter is a torque multiplier. Having the converter flash or not will effect that function.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #10 of 28 Old 05-14-2016, 09:50 AM Thread Starter
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UPDATE
changes : jet extensions , mt bracket radial slicks 28 10.5 15 (seem to be awesome tires)

2.4 60ft
8.6 @ 89mph about 6000-6100
13.0 @ 108 mph about 6700-6800. MPH seems low to me.
Car is hooking and then falling on its face at launch . My afr gauge is reading 11.0-12.0 @ low rpm / part throttle cruise . Goes up to 13.5-14.0 at mid rpm / cruise and then way lean @ WOT.
Trying to figure it all out. Hoping to get another test n tune next wed with a two step and see if I can get the carb sorted out. Any guidance would be appreciated, thanks !

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post #11 of 28 Old 05-14-2016, 10:10 AM
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Make sure your ignition system is really up to the task. I've had carb bogs I've chased for a long time only to find out it was the ignition.

'67 notchback 289 Mustang - first car.
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post #12 of 28 Old 05-14-2016, 10:38 AM Thread Starter
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Make sure your ignition system is really up to the task. I've had carb bogs I've chased for a long time only to find out it was the ignition.
Didn't think about that. What's the best way to go about checking that?
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post #13 of 28 Old 05-14-2016, 11:09 AM
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Mph is there for a high 7 second, mid 12 second run. Your 60ft is killing you.

Joe

93 GT w/ 331
Bottom of the Barrel Budget
Working on the 60ft, thanks Kevin Slaby!
1.57 60ft and 7.45 @ 92.19, Previous best 60ft was 1.83.
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post #14 of 28 Old 05-14-2016, 10:39 PM
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You have a fuel,or ignition system problem. Based on AFR's & how it's behaving.. I'm going to guess fuel delivery/system. What does the fuel + ignition system consist of & have you checked timing at various RPM's??
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post #15 of 28 Old 05-15-2016, 09:01 AM
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Didn't think about that. What's the best way to go about checking that?
Great question. On my Capri I figured it out by swapping carbs with no improvement, then I bought a new ignition system and the problem went away. I have a 69 Torino GT vert with the same problem and haven't yet resolved it, but the swapnostics effort isn't complete yet.

'67 notchback 289 Mustang - first car.
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post #16 of 28 Old 05-15-2016, 05:07 PM Thread Starter
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You have a fuel,or ignition system problem. Based on AFR's & how it's behaving.. I'm going to guess fuel delivery/system. What does the fuel + ignition system consist of & have you checked timing at various RPM's??
Msd everything .6al box. I'm thinking it's my float level. I have the level set where it splashes over when u rock the car. I was told it needs to be raised a bit for wot launches . Hoping to get out there on wed.
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post #17 of 28 Old 05-15-2016, 10:29 PM
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I don't think that minor change in float level is going to make any difference.

'67 notchback 289 Mustang - first car.
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post #18 of 28 Old 05-16-2016, 10:32 AM Thread Starter
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I don't think that minor change in float level is going to make any difference.
Well I hope you are wrong lol. On the street, with street tires, it will just smoke the tires off the trans brake. At the track, when it hooks it bogs. Seems like a lean bog.
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post #19 of 28 Old 05-16-2016, 04:09 PM
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jet the carb up, you have good 1/8 mile speed @ 88, but the 108 sounds like its laying down out the top.
'64galaxie500 likes this.
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post #20 of 28 Old 05-17-2016, 09:54 AM
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^^agree'd, while I am no expert, I trap mid/high 88's in the 1/8th and mid/high 112's in the 1/4... 3270lbs car.

Mike H.
Duffee 306 and E7te's, Buddy Rawls cam. 368rwhp/363rwtq.
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post #21 of 28 Old 05-17-2016, 10:16 AM Thread Starter
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^^agree'd, while I am no expert, I trap mid/high 88's in the 1/8th and mid/high 112's in the 1/4... 3270lbs car.
Damn. I got stuff to figure out. I think I'm shifting too soon. I have video of a pass but dk how to post it.
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post #22 of 28 Old 05-17-2016, 11:18 AM
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Does the car have the stock fuel lines ?
What is fuel pressure ?

427 T56 3.90 2 kits
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post #23 of 28 Old 05-17-2016, 11:48 AM Thread Starter
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Does the car have the stock fuel lines ?
What is fuel pressure ?
no not stock, lines from summit. and i believe 5-7.
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post #24 of 28 Old 05-17-2016, 11:49 AM Thread Starter
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here is one of the passes
https://youtu.be/L3EE6TnVgkY
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post #25 of 28 Old 05-18-2016, 10:49 AM
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The way the car left the line. It looks like you have a fuel issue.
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post #26 of 28 Old 05-18-2016, 03:33 PM
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Wrong power valve

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #27 of 28 Old 05-21-2016, 08:23 AM
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Years ago I had a very similar problem. Car would hook decent on the street, and dead hook then bog at the track. When at the track it was picking up the front end enough to slosh fuel out of the bowl vents causing it to bog momentarily.
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post #28 of 28 Old 06-13-2016, 08:58 AM Thread Starter
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****UPDATE****
1.78 60 ft
8.0 1/8
12.6 1/4 @ 105. Off the trailer.

Only change I made was the squirters. For whatever dumb reason, I had a 35 squirter on the front and a 26 on the back. I just reversed them and the car performed way better off the line. BUT, there is still a slight stumble, just no where near what it was. Oh yeah, I also put in a new msd6al2 box but the two step was not hooked up.

Only got two passes in. Car is backing out of three when I engage the t brake, when I tried to reset I went too far FWD and caused a red light, they backed me back up and reset the tree but for whatever reason , the timer didn't reset and I ended up with like a 30 sec 1/4 slip lol. On that second pass I looked over at my afr gauge and it was around 15 at WOT. after the pass I pulled a few plugs and it was definitely running lean. It was already late so I decided to call it a night .

So, what should I aim for afr wise at wot ? And what's the fix for the car backing out of the t brake?

Thanks.
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