What Does My Combo Need? - Forums at Modded Mustangs
 
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post #1 of 19 Old November 14th, 2006, 11:17 AM Thread Starter
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What Does My Combo Need?

I'm trying to figure out the weak link of my setup. This is my ride:

1982 GT (t-top)
351w(.060),10:3, ported & polished iron heads, 1.94/1.60 valves, BBK shorties & flowmasters, 274XE cam, stealth intake, mallory dizzy, stealth intake, 750dp, Edge 3700 stall converter, C-4, 4:10's

The cam specs are: 274*/286*(230/236) .519/.523 110*LSA
The heads are '74 351w casting rebuilt with the larger valves intalled and mild port & polish work

My best run has been [email protected] with a 60' time of 1.67
I feel I should be trapping at 107-108mph. It runs STRONG for the first 1/8 mile and then seems to run out of steam. I'm going through the traps at 5600
What would really wake this combo up that would get me low 12's or high 11's?
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post #2 of 19 Old November 14th, 2006, 11:28 AM
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Re: What Does My Combo Need?

Quote:
Originally Posted by 82GT
I'm trying to figure out the weak link of my setup. This is my ride:

1982 GT (t-top)
351w(.060),10:3, ported & polished iron heads, 1.94/1.60 valves, BBK shorties & flowmasters, 274XE cam, stealth intake, mallory dizzy, stealth intake, 750dp, Edge 3700 stall converter, C-4, 4:10's

The cam specs are: 274*/286*(230/236) .519/.523 110*LSA
The heads are '74 351w casting rebuilt with the larger valves intalled and mild port & polish work

My best run has been [email protected] with a 60' time of 1.67
I feel I should be trapping at 107-108mph. It runs STRONG for the first 1/8 mile and then seems to run out of steam. I'm going through the traps at 5600
What would really wake this combo up that would get me low 12's or high 11's?
Most combo's include Fries and Soda. I didn't see those listed. Just screwing with you, I am not even close to your mods, so I can't help, but I am sure some folks will chime in and help you. Oh BTW, welcome to Modded Mustangs, and I hope you had a chance to go to the new members section and share pic and junk about your ride. Sounds like you have already invested some serious cash and time

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post #3 of 19 Old November 14th, 2006, 11:30 AM
 
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Does your top end power seem weak? If so, get a better intake or something like that.
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post #4 of 19 Old November 14th, 2006, 12:54 PM
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With a C4 trans / 3700 stall and 4:10 gearing, how tall a tire are you running for the rear slicks?
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post #5 of 19 Old November 14th, 2006, 05:44 PM
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Have you put it on a dyno? There seems to be a HP loss in there somewhere. A good dyno tune will prob help you sort things out.

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post #6 of 19 Old November 14th, 2006, 09:00 PM
 
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I think part of your issue is tire height and possibly the heads...what cc are the combustion chambers?...I am running the following:

351W=358ci (bored .030)
AFR 185s with 7/16 studs and 1.6 RR
KB Pistons 11.3:1 CR
MSD Pro Billet Dizzy
Hooker Long tubes
Edelbrock Super Victor Jr
Mighty Demon 825cfm
Crower Cam 282/288 .538/.557 112LS
CSR Elect Water pump
MSD 6AL
MSD 2 Step
Redneck Perfomance C4 w/transbrake

combination puts down 540 at 6500
4500 stall converter (Redneck Performance)
8.8 rear with 33 splines, FS, and 4.56 cogs
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post #7 of 19 Old November 14th, 2006, 10:13 PM
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A good set of head will go a long way. I don't think there is much more to be gained with your stock heads.

My daily driver has 16 cylinders and 4400hp @ 1000 rpm....


***1988 Mustang GT - Stock....almost
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post #8 of 19 Old November 14th, 2006, 10:58 PM Thread Starter
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Quote:
Originally Posted by ProDetroit
With a C4 trans / 3700 stall and 4:10 gearing, how tall a tire are you running for the rear slicks?
\

I'm running 26x9x15 slicks. Would 27 or 28inch slick work better for me?
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post #9 of 19 Old November 14th, 2006, 11:02 PM Thread Starter
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Quote:
Originally Posted by IcantDo55
Have you put it on a dyno? There seems to be a HP loss in there somewhere. A good dyno tune will prob help you sort things out.
Unfortunatly, there are no dynos around my neck of the woods or , at least, none that I know of...
I figured out my % of converter slippage to be 4-5%, which is very good.
I just feel it's missing something like Icantdo55 suggested.
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post #10 of 19 Old November 15th, 2006, 03:13 AM
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Quote:
Originally Posted by 82GT
Quote:
Originally Posted by IcantDo55
Have you put it on a dyno? There seems to be a HP loss in there somewhere. A good dyno tune will prob help you sort things out.
Unfortunatly, there are no dynos around my neck of the woods or , at least, none that I know of...
I figured out my % of converter slippage to be 4-5%, which is very good.
I just feel it's missing something like Icantdo55 suggested.
Where are you located...Maybe someone here might no of one...

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post #11 of 19 Old November 15th, 2006, 05:50 AM
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Quote:
Originally Posted by 82GT
Quote:
Originally Posted by ProDetroit
With a C4 trans / 3700 stall and 4:10 gearing, how tall a tire are you running for the rear slicks?
\

I'm running 26x9x15 slicks. Would 27 or 28inch slick work better for me?
That depends on what your RPMs are when you go through the traps. Usually (and not always) you find stangs running a 26" tall tire with 3:73; but there are some that run a 4:10 with them as well. (28" /w 4:10/4:30)

In addition, with an auto trans your torque converter will play a role in the mathmatics too.

^ just my .02 cents
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post #12 of 19 Old November 15th, 2006, 08:22 AM Thread Starter
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My rpms are about 5600 through the traps and the range of my cam is 2000-6000

2000 mustang 3.8

CAI, MAC duel exhaust.
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post #13 of 19 Old November 15th, 2006, 09:01 AM
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Quote:
Originally Posted by 82GT


I'm running 26x9x15 slicks. Would 27 or 28inch slick work better for me?
Your tire size is fine......for now.

My daily driver has 16 cylinders and 4400hp @ 1000 rpm....


***1988 Mustang GT - Stock....almost
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post #14 of 19 Old November 15th, 2006, 04:38 PM
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I agree the heads are the weak link. a set of aftermarket aluminum heads will take weight off and flow alot beatter. if you wanted to risk it have them milled to keep your compression up. as many mods as you have I would say the heads are choking the monster.

also, do you have subframe conncters (the weld in type) I know the t-tops arnt as bad as the convertables but still a flex issue to get better footprint with you tires.

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post #15 of 19 Old November 15th, 2006, 05:33 PM Thread Starter
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Quote:
Originally Posted by dr.gonzo
also, do you have subframe conncters (the weld in type) I know the t-tops arnt as bad as the convertables but still a flex issue to get better footprint with you tires.
Yep, I have them(welded) with the cross braces for the seats.
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post #16 of 19 Old November 15th, 2006, 10:34 PM
 
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heads...tires are fine

also a better stall converter would benefit you hugely...torque converter is also like a torque multiplier
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post #17 of 19 Old November 15th, 2006, 11:51 PM Thread Starter
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Quote:
Originally Posted by 03svtsnakevert
heads...tires are fine

also a better stall converter would benefit you hugely...torque converter is also like a torque multiplier
A better converter! I already have an Edge 3700 stall converter and pull 1.67 60' times.
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post #18 of 19 Old November 16th, 2006, 06:53 AM
 
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Quote:
Originally Posted by 82GT
Quote:
Originally Posted by 03svtsnakevert
heads...tires are fine

also a better stall converter would benefit you hugely...torque converter is also like a torque multiplier
A better converter! I already have an Edge 3700 stall converter and pull 1.67 60' times.
okay, but even though it is a 3700 where does the car stall??? the stall of the engine is also relative to the torque the engine makes

lower torque small blocks may not reach full stall of 3700 and may stall at only 3000 and high torque motors may surpass it
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post #19 of 19 Old November 16th, 2006, 07:56 AM Thread Starter
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I can footbrake it to 3100. I don't need more stall speed. This is also a street car. If I needed more stall, I would get a transbrake.

2000 mustang 3.8

CAI, MAC duel exhaust.
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