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Hey all, I just bought a 98 ES and am totally new to the LH cars. What mods do you guys recommend doing to it (nothing crazy) this is my driver, and I am just looking for a few tips to make it a little more drivable / fun to drive and possible get a little more mileage out of a tank of fuel.
 

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Try inflating tires to 44psi, if they can take it(check sidewall), and have alignment checked. Tune engine. Take everything out of trunk. Put synthetic (suggest Mobil 1) oil in engine. Get a K & N or Joe KD intake. Will make it sound nice, possibly a few MPG increase . . .1 or 2?
 

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SILVER BULLET said:
Try inflating tires to 44psi, if they can take it(check sidewall), and have alignment checked. Tune engine. Take everything out of trunk. Put synthetic (suggest Mobil 1) oil in engine. Get a K & N or Joe KD intake. Will make it sound nice, possibly a few MPG increase . . .1 or 2?
Good advice....
also if you want a tad bit more sound... get a Flowmaster, or magnaflow muffler installed.
 

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*Mobil 1-- for that extra added protection
*sea faom--see my post here about it.
*proper tire inflation

as far as perpormance goes...not to much more than what has been mentioned. NOTE The "speed chips" from ebay don't work...save your money and questions about them.

Other than that....Welcome.
 

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Hmm, no disrespect ment, but the giant list of SEA FOAM info sound exactly like what Marvel Mystery Oil has been purported to do for decades.

Overinflating the tires ia as bad as underinflating the tires= overinflating will provide less rolling resistance (marginally) but will wer them out faster.

Is 44lbs the ideal or overinflated? (I'm too laxy to place a stip of masking tape on the tire and drive 20 feet)
 

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justme- said:
Hmm, no disrespect ment, but the giant list of SEA FOAM info sound exactly like what Marvel Mystery Oil has been purported to do for decades.
No disrespect taken. We are all entitled to our own opinion. I was skeptical about it until I used it. Works great IMO. My new favorite as far as an upkeep tool.

Have you tried it?
 

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silver&gold said:
No disrespect taken. We are all entitled to our own opinion. I was skeptical about it until I used it. Works great IMO. My new favorite as far as an upkeep tool.

Have you tried it?
No, never heard of it. Been useing Marvel Mystery Oil since I was Knee high to a Grasshopper- as they say. Been working on cars since I was 7, my dad had 3 service stations back in the day (60's/70's)- specialised in imports since not many other places would, but worked on everything- many "treatments" and "Products" have been around a long time, or have been and gone several times. Marvel has been around a looooonnnnggggg time and basically delivers.
Remember those Duralube commercials where they ran the engines, drained the oil and ran the engines again in Arizona? Marvel used to do that, except they didn't cheat like Duralube did. Marvel will protect your engine for a few extra minutes if oil pressure is lost and Marvel is in the oil at the time. (just long enough for you to realize there is a problem and shut it off, as opposed to having damage done before you can shut it down)
I'll have to look into Sea Foam around here, see who knows what.
 

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justme- said:
I'll have to look into Sea Foam around here, see who knows what.
seafoam works. it gets rid of carbon build up pretty good. the prefered method is to run the car on soley seafoam which to my knowledge noone besides me has done here. (sorry if im wrong). but for that you need a fuel injection service kit. works great since the injectors are spraying the seafoam directly inback of the intake valve were alot of carbon and stuff accumulate. alot of dealerships are performing this service more and more but its really expensive to do $100+. I luckily had the equipment and all I had to do was buy the solution.
 

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SILVER BULLET said:
Try inflating tires to 44psi, if they can take it(check sidewall)
Wholly crap!!!!!!!!!!!!!!!!!!!!!!!!

44 PSI ?????
:brutal_29
That's not safe or good for the tire. Besides, tire pressure changes 1 psi for every 10 degrees in ambient temperature. So if there is a +30 degrees change in temperature your tire pressure is now 47 psi!

Follow the vehicle manufacturer's recommendation on tire pressure. Ours is 32 psi checked on a cold tire. The Intrepid already has a pretty firm ride. 44 psi would firm that up even more.

What ever gave you that idea ???
 

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First off - Welcome to DI.Net!!! You'll find a lot of great info and many items of interest and entertainment on here. The Second Gen (1998-2004) How-Tos and FAQs have lots of good info in them. And hypnos has a good sticky in the First Gen forums for mild performance mods, most of which apply to all LH (Intrepid, Concorde, 300M, Eagle) cars.


Let's see (I'm assuming you have a 3.2L) ...
Exhaust - Should be good for a daily driver since it's designed for a 3.5L

Intake - Get a K&N drop-in (~$50) at the very least. You could also help it breathe better by adding another hole to the stock airbox. 1.5-2" should be good for a 3.2L. I put my hole in the lower, front edge and put a SS screen over it to keep the bugs out. You could also go one step farther and add a K&N or JoeKD intake kit (~$225).

Tranny - Make sure you stick with a good maintenance schedule on these and make sure you use ATF+4 fluid - no substitutes or "ATF+4 complaint" labels. They're not the same and have caused problems for several people. IMO - the minimum interval should be 48k miles as called for under schedule "B" in the owner's manual.

Differential - Some people have gotten a little more performance (but less MPG's) by putting the "SE" differential gears in their cars (~$100). These gears are 3.89:1 instead of the standard 3.2/3.5L 3.66:1 gears.

Tires - I'm with 04IntrepidSXT on this one, 32 PSI - or whatever your driver's door recommends.

Since I don't know your mileage I can't say much else. Hope to see you 'round the forums ...!
 

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Discussion Starter #11
Yep I've got the 3.2 its sitting at about 160,000 miles right now. The 44 psi thing is.... not something I am going to try, I'm not that desperate for an extra mpg LOL! I am going to get either a K&N drop in ( would like the FIPK, but will have to wait and see what the bank account says about that one!) I am also totally aware of the ATF 4 thing, As I am a hardcore dodge guy and that is common knowledge around my place! I am guessing that there is no difference in the TB with a 3.2 and a 3.5HO ?

One thing that I would like to do ( shortly) is to put the dual exhaust on the rear off of a newer 300m mainly just for the "cool" factor! Has anyone done this mod?
 

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DodgeNut22 said:
One thing that I would like to do ( shortly) is to put the dual exhaust on the rear off of a newer 300m mainly just for the "cool" factor! Has anyone done this mod?
Many people have dual tips. The 300M Specials have dual tips from the factory but I think the rest are just single - I know my R/T is. Do a search - most of the guys use a FlowMaster 80 series to split the exhaust back there. I stuck with single exhaust but changed over to 3" from front to back. That'd be a little much for the 3.2L, though.

I'm pretty sure the 3.2L & 3.5L are the same - 68mm - but the only parts listing around here is for 2002 and they discontinued the 3.2L that year.

Speaking of parts, this is the 2002 version if you don't already have it and the 2002 FSM ...
 

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I had a 98 ES and put a zillion miles on it, and had 44psi the whole time. Got about 24- 25 mpg overall, and over 50k miles on several sets of goodyear eagle tires. No maint issues what so ever on the car. Put 44 (as recomended on sidewall) in the 02 R/T, got 22.5 mpg, no issues, firm ride, exceptional handling.
 

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SILVER BULLET said:
Put 44 (as recomended on sidewall) in the 02 R/T, got 22.5 mpg, no issues, firm ride, exceptional handling.
I hate to disagree with you but ... I think if you'll look a little closer at that "recommendation" on the sidewall you'll find it says maximum PSI not recommended PSI. Every tire site - Goodyear, Michelin, Dunlop, etc. - tells you to use the manufacturers recommendation for PSI ...
 

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Yes, but it does depend on the tire itself. My Kumho's have a MAX pressure of 51psi. I run then at 38 psi. All the high performance tires I've ever owned were run at 38-42 psi, and wore very evenly, except my first set several years ago... I ran my first set of performance tires at 32 psi, and wore the shoulders off in a heartbeat. Check with the tire manufacturer!!!
 

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D76G12 said:
I hate to disagree with you but ... I think if you'll look a little closer at that "recommendation" on the sidewall you'll find it says maximum PSI not recommended PSI. Every tire site - Goodyear, Michelin, Dunlop, etc. - tells you to use the manufacturers recommendation for PSI ...
I measured the pressure cold, prior to driving more than one mile, keeping the speed under 30 mph. What I meant by recomendation was the max pressure. Of course, many people prefer a cushier ride, and lower pressure. My point is, you actually get good tire life, and very good handling, at 44psi on the Intrepid, at least with performance tires. The fact that I put over 200,000 miles on a couple different Intrepids, with good gas mileage, and practically zero repairs (including suspension, body, drivetrain, tires, brakes, interior etc) simply means there is another way to go. The decreased rolling resistance is also easier on the engine and transmission. The cars drove fairly smoothly, although the ride was firm. No passengers ever thought anything was wrong, nor did the car "crash" into bumps or potholes. This pressure is a real option, just not one that many people use, or even try, as they "know" it will not work.
 

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If I were to run non-recommended pressure in my tires it would only be after doing a surface test with the tires at least warm, not cold. I did something similar to this with my Road Runner tires. Instead of the recommended 26 PSI for the stock G60-15's it came out to 28 PSI for the 255/60R15's that are on there now. 26 PSI was darker on the outside and 30 PSI was darker on the inside. Of course, I run 32 PSI on the street - I'd hate to see the bead pop on a pot-hole. :eek:
In2Deep said:
Yes, but it does depend on the tire itself. My Kumho's have a MAX pressure of 51psi. I run then at 38 psi. All the high performance tires I've ever owned were run at 38-42 psi, and wore very evenly, except my first set several years ago... I ran my first set of performance tires at 32 psi, and wore the shoulders off in a heartbeat. Check with the tire manufacturer!!!
Did you click on any of the links? But maybe Kumho is different? Guess not - though they do point out something I failed to mention in this post. If you are no longer running the stock tire size then the factory recommendation would be off - but only by 2-4 PSI.
SILVER BULLET said:
This pressure is a real option, just not one that many people use, or even try, as they "know" it will not work.
I would NEVER exceed the rated pressure of a tire and - IMO - anybody that does is a menace to the driving public. If you've been running your tires @ MAX pressure (cold) for all these years then it's a good thing the tire manufacturers put in a safety factor or you would have most likely learned the hard way why those rating are there.


But maybe both you guys are right and Goodyear, Michelin, Kumho, et al, just don't know tires ...
 

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...i forgot what i was going to say....
 

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oh yea... The specials have dual exhaust all the way. I believe TFC has done the whole swap. Dual's from engine to x-over to dual all the way back. i believe Blurred10 has too.
 

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Archael said:
oh yea... The specials have dual exhaust all the way. I believe TFC has done the whole swap. Dual's from engine to x-over to dual all the way back. i believe Blurred10 has too.
No they don't. The Specials have a set-up similar to mine - except I stuck with a single outlet.

Starting at the font resonator it has dual 2.25" tubing to just in front of the gas tank, then "Y" into a 3" single, mandrel bent pipe to the muffler behind the tank, then the muffler splits it off into dual 2.5" tail pipes that have resonators on them. Here's the pics TFC posted ...

 
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