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Old 05-11-2011, 09:34 PM   #1
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1998 Mustang GT

I just got my 98 Mustang GT on a dyno today. The only things done are a BBK CAI and Flowmasters. I only put down 170 HP and 230 TQ. What could I do to improve this?
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Old 05-11-2011, 09:46 PM   #2
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Re: 1998 Mustang GT

um sue the guy bc somethings terribly wrong with your car... how are you not in the low to mid 200s?
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Old 05-11-2011, 09:49 PM   #3
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Well it's mostly stock lol I got the car for free. I'm looking to do a pi swap and getting it tuned
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Old 05-11-2011, 11:36 PM   #4
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Re: 1998 Mustang GT

pi swap is a solid choice, but a power added like a s/c is alot more fun
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Old 05-11-2011, 11:37 PM   #5
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Haha well yeah but I'm limited fund wise
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Old 05-12-2011, 01:34 AM   #6
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Re: 1998 Mustang GT

All of the power in an engine comes from the cam shaft(s). If you want more power you need to open the valves more in order to allow more fuel and air to enter the combustion chamber allowing for a bigger explosion giving you more power. You achieve this with a larger cam shaft. Putting on a new exhaust system, "cold air" intake, etc. without a larger camshaft will not help because you are not putting more air/fuel into the combustion chamber simply because the valves are not opening any farther then before (you may gain a few horsepower put it won't be a noticeable difference). A cheap way to imitate having more power is to purchase lower rear end gears (I've seen the best reviews from 3.73s). Having lower gears in the rear end enables you to catch more torque in lower rpms. The only problem with this is that you will still have the same horsepower at high end. But at least it will feel good at take off.

If you have limited funds, this site has camshafts for a good price, but you still have to pay for installation and such.

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Old 05-12-2011, 01:36 AM   #7
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I totally agree with you and I'm always looking on American muscle actually. I have a shop that with parts and labor it would be 550. Is that a good deal and I was also told 3.73 gears would be good with a supercharger?
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Old 05-12-2011, 01:37 AM   #8
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Re: 1998 Mustang GT

On a secondary note:
A 1998 GT comes stock with 225hp and 290ft-lbs so either you have a **** ton of miles on it or there's something wrong with it.
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Old 05-12-2011, 01:39 AM   #9
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I have about 90000 miles and they said to do a tune up on it with some Ngk spark plugs and msd wires. Idk what could be wrong.
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Old 05-12-2011, 03:22 AM   #10
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Re: 1998 Mustang GT

True, a tuneup could help but you don't want to spend an unnecessary amount of money on spark plugs. No matter what plugs you use, they're going to create a spark that will ignite the air/fuel. The only way to completely gain back all of your power is to rebuild the engine because what causes such a loss of power is wear on the parts and seals. As far as that price, what parts are you talking about? Cams and the rear gears or just the rear gears?

As far as the supercharger goes, I'm personally not big on forced induction nor do I know a whole lot about it. What I can tell you is that forced induction increases your hp. The thing to know is that torque is the only actual measurable force in an engine. Torque is present in low to mid rpms and then goes away in high rpms. Horsepower then takes over for the torque in high rpms. Horsepower is really just the absence of torque in high rpms. There is a calculation used to figure hp since it is not measurable. I can't remember the calculation off the top of my head right now though. So how 3.73s would work with a supercharger IDK but I would think that it would be more about durability the rear gears given the power increase that the supercharger would give you. I'm sure some of these other guys would be able to answer that question better than me.
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Old 05-12-2011, 03:24 AM   #11
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Re: 1998 Mustang GT

I wouldnt be able to afford a supercharger for a long time anyway lol. Im gonna give it a good tune up most likely unless I get a good deal on a PI swap
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Old 05-12-2011, 07:29 AM   #12
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Re: 1998 Mustang GT

Honestly those numbers sound right. I doubt there is anything wrong with your car. Dynos dont give you the exact correct info and every dyno is different. If you want to get a good bump in power without spending to much money try doing a PI intake manifold swap you can buy everything for it for around $350 or less and it seems pretty straigt forward to swap. Then get a tuner or a tune from the dyno shop. With the intake,exhaust, and PI manifold swap with the tune you should see a considerable increase in your horsepower. I would say about 30+ to the rear wheels. That seems to be the average gain from those 4 mods combined. I've been looking into these things for my 96 gt vert. Just do your research, there is lots of info out there.
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Old 05-12-2011, 08:29 AM   #13
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Re: 1998 Mustang GT

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Originally Posted by 98RedGT View Post
I just got my 98 Mustang GT on a dyno today. The only things done are a BBK CAI and Flowmasters. I only put down 170 HP and 230 TQ. What could I do to improve this?
those year GT's are just bad in the performance department, a set of PI heads/intakes will bump the flywheel hp from 215 to 285~ other than that you could look at a 4v motor to start off with 300hp~
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Old 05-12-2011, 08:49 AM   #14
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Re: 1998 Mustang GT

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those year GT's are just bad in the performance department, a set of PI heads/intakes will bump the flywheel hp from 215 to 285~ other than that you could look at a 4v motor to start off with 300hp~
I agree, my 98 GT was slow stock compared to my 03 Roush. In 98 they were rated at 225hp.
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Old 05-12-2011, 10:06 AM   #15
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I'll stick with the pi swap in that case and go on from there
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Old 05-12-2011, 11:07 AM   #16
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Re: 1998 Mustang GT

There is smething wrong somewhere maybe that is why you got it for free it should have 225hp thats stock.
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Old 05-12-2011, 11:16 AM   #17
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Yeah but take 24 percent off if that and it's about right.
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Old 05-12-2011, 11:17 AM   #18
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Re: 1998 Mustang GT

cleaning out the fluids and doing some upkeep like seafoaming to remove carbon buildup etc might restore some lost ponies.
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Old 05-12-2011, 11:23 AM   #19
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Re: 1998 Mustang GT

Yah apply your typical 15-20% parasitic loss and that's about right for that year 4.6L. As said the PI swap is a good thing to do...bring you up to 99-04 specs.
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Old 05-12-2011, 06:33 PM   #20
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Seafoamed and cleaned the filter and tubing on my CAI today added more oil.
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