Performance for 99 3.8 - Mustang Evolution

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Old 11-12-2016, 12:07 AM   #1
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Performance for 99 3.8

What would you guys say would be the most noticeable performance mod for a 99 3.8 with a 350 budget
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Old 11-12-2016, 12:48 AM   #2
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Not a whole lot.

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Old 11-12-2016, 07:28 AM   #3
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I've have experience dumping large sums of money into a 3.8. There is nothing that I did that really made a worthwhile difference, except suspension. Big money is required for a noticeable HP performance increase. Well, except nitrous. But I digress. Suspension was the only area where there were very worthwhile gains in handling. With your budget I'd personally grab a set of quality springs. You'd still have a few bucks left over to boot.

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Old 11-13-2016, 05:33 PM   #4
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I've have experience dumping large sums of money into a 3.8. There is nothing that I did that really made a worthwhile difference, except suspension. Big money is required for a noticeable HP performance increase. Well, except nitrous. But I digress. Suspension was the only area where there were very worthwhile gains in handling. With your budget I'd personally grab a set of quality springs. You'd still have a few bucks left over to boot.

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If I get springs is there any thing else I would have to get along with them?
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Old 11-14-2016, 10:44 AM   #5
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If I get springs is there any thing else I would have to get along with them?
It's would be smart to do shocks too. I prefer going with the fox body struts and shocks when lowering as they are shorter than the new edges. Also depending on how low you going camber will need to be addressed. And don't forget the alignment.

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Old 11-14-2016, 11:20 AM   #6
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New isolators as well.
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Old 11-14-2016, 11:49 AM   #7
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I'd say getting a lower rear gear would help pep any Mustang up without engine mods. I'm not sure what options are available for the 7.5 (I think?) open diffs. I'm not sure what the stock gears are, but 3.55 or 3.73 are nice without blowing up your gas mileage. For the GT's, this mod is the best bang for buck mod.
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Old 11-15-2016, 08:37 AM   #8
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Oh yes, the 3.8 will definitely benifit from some gear. They make lsds for the 7.5, but I'd personally do an 8.8 swap vs dumping money into a 7.5 axle.

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Old 11-21-2016, 09:23 PM   #9
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These days you're better off finding an 8.8" rearend. I don't believe FRPP makes the 7.5" tloks anymore so you're stuck paying $800 for an Auburn. Pretty sure you can get a whole 8.8 shipped for that.

I agree that aside from suspension gears are the best bang for your buck mods for under a grand.

Save up some more and get the SR coilovers or an 8.8 rearend. Or get an SCT handheld tuner now. If you're an auto the improved shift points and firmness will be noticeable.
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Old 12-09-2016, 02:51 PM   #10
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A couple years ago the 7.5 in my old V6 blew up so I took the opportunity to upgrade to an 8.8 with 3.73 gears. Scored it for $150 on Craigslist. Best mod I'd ever done to the car.

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Old 12-11-2016, 06:42 PM   #11
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A couple years ago the 7.5 in my old V6 blew up so I took the opportunity to upgrade to an 8.8 with 3.73 gears. Scored it for $150 on Craigslist. Best mod I'd ever done to the car.

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I've been keeping a close eye on Craigslist in my area, sadly no crazy deals, if there are even parts available...

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Old 03-07-2017, 03:49 PM   #12
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Which one would you see the most gains out of as far as speed for the 3.8 99, a cold air intake or accel coil packs?
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Old 03-07-2017, 04:08 PM   #13
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Which one would you see the most gains out of as far as speed for the 3.8 99, a cold air intake or accel coil packs?
Neither.

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Old 03-07-2017, 05:41 PM   #14
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Neither.

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Any good bolt ons to get some more hp?
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Old 03-07-2017, 10:08 PM   #15
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I changed out the bushings on The steering rack on ours. I think it cost me like 20 bucks or something and took like 30 min. It made a huge difference in steering performance. No more sloppy wheel.
As far as acceleration goes my vote is for gears. Even if you skip the traction lock.


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Old 03-08-2017, 07:20 AM   #16
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Any good bolt ons to get some more hp?
Turbo or supercharger.
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Old 03-08-2017, 05:43 PM   #17
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Which one would you see the most gains out of as far as speed for the 3.8 99, a cold air intake or accel coil packs?
I agree with neither. If you have a $350 budget save another $50 and pick up an SCT X4 from Bama with custom tunes. It'll be the biggest noticeable difference on a stock/near stock car without diving into gears and suspension.

If yours is an auto the shift points and shift firmness will be very noticeable. The car won't be gapping Cobras but it will feel much better over stock.
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Old 03-10-2017, 02:13 PM   #18
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I agree with neither. If you have a $350 budget save another $50 and pick up an SCT X4 from Bama with custom tunes. It'll be the biggest noticeable difference on a stock/near stock car without diving into gears and suspension.

If yours is an auto the shift points and shift firmness will be very noticeable. The car won't be gapping Cobras but it will feel much better over stock.
What exactly does the SCT X4 do?
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Old 03-10-2017, 02:22 PM   #19
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Its a tuner. Modifies the PCM for maximum performance. Read about it here.


https://www.sctflash.com/Products/un...nce-programmer
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Old 03-10-2017, 05:45 PM   #20
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Put that $350 towards some nice summer clothes and a gym membership. Drive your 3.8 as reliable transportation. When you can afford something fast, then get something fast. Even if you had $1000 you'd make your car "not quite so slow". Current sedans beat up on the 3.8L...
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Old 03-10-2017, 06:07 PM   #21
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Ouch!!!


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Old 03-10-2017, 10:12 PM   #22
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Put that $350 towards some nice summer clothes and a gym membership. Drive your 3.8 as reliable transportation. When you can afford something fast, then get something fast. Even if you had $1000 you'd make your car "not quite so slow". Current sedans beat up on the 3.8L...

+11 on this!.. Knew a guy that did a full Exhaust, gears, Windstar Intake, Tune, and some other crap!.. His 3.8 is now just as "fast" as a Stock GT of the same year, and on a Bad Day!..


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