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Street Build AYY, GSX!

Mitsubishi Eclipse GSX
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  1. Yokai

    Yokai Probationary Member

    Joined May 9, 2020
    Denver, Colorado
    Wassup DSM fam. Introducing my white '98 GSX

    Ayyo! I have a background in Honda's, I've done a lot of work to my EG hatch but in order to do bigger projects I needed a support vehicle. I thought about getting another Civic but I knew I would just be doing all the same stuff to it, and wanted something with a better reputation.

    Turbo.. AWD.. white.. manual.. mmmmm. Took me a long time to find one.


    It had some issues, previous owner put some work into it but it'd just been sitting. He was considering parting it out, so I'm glad he didn't. It struggled to stay running but it was enough to load it on the trailer. I was happy enough to simply find the features I wanted, so I took the chance on mechanical condition with the intention to rebuild either way.


    DMd7AVN.jpg EANU7vh.jpg

    Now the fun begins. Spark test was good, compression test read low on middle two (110 | 60 | 70 | 130) I also followed with a 'cap of oil' test and leakdown test, and the rings seemed good to me.

    However the wheels had this old dirty plastidip and were bent in multiple spots. One tire was ripped(I think from loading it with a flat). As much as new wheels and tires would be nice I wanted to keep the budget in getting the car running. I still needed something to roll around on and drive the car when it was repaired so I grabbed some used tires.



    I found a pretty cool shop that repaired my wheels pretty cheap. I think it cost me about $120, dude just used a lead hammer and heat and got them really close! The plastidip was a $*#$Q(*!$ to remove, using goo-gone automotive, letting it soak, and then it would basically turn into chewing gum that had to be brushed off..

    I was tempted to leave them silver, but they did have quite a bit of corrosion and weren't in the best shape. I made the decision to paint them black to chase my panda theme. However, now I also needed to use chemical stripper to clean the clear coat off and discovered the silver is actually paint as well..


    I didn't want to spend the money on powdercoat since I wasn't sure if I'd be upgrading to 18's or not, and I went satin black to help the tire blend in to the wheel. (Later on I used Adam's tire cleaner and they blend much better) But you didn't come here to read about stock wheels and used tires..

    A cold winter + unheated garage = building a little lab to do the engine work /w propane heater


    Cozy boi. Time to get to it.




    I had read about porting the oil inlet on the head, this is usually done in case the head is milled too much apparently, but I thought it couldn't hurt while I had it off. This is done under the cylinder head where it meets the oil feed on the bottom-left of the block in the pic above.


    As for the block surface, I've done a lot of research. There's a sh** load of bad advice out there. I think the best method by far without pulling the block to be machined, is using a thick sheet of glass with 400-600-800 sandpaper. I've done this on my Civic with good success. The Eclipse iron block is MUCH harder to cut through. I wasn't concerned at all about taking off too much material. I couldn't even get the old headgasket stains out. It does clean the surface very well and gives the new MLS a good, consistent RA smoothness to seal.

    ay8Mxyc.jpg B3pW5Cn.jpg m3Ckv9G.jpg dJycvYN.jpg zg4cAFV.jpg mbNc9hp.jpg

    Parts! Parts! Parts!


    Cylinder head is back from the shop, the middle exhaust seals were burnt out. I asked if we should replace all of them, and they said they probably burned out from too much boost or fuel issues. I'm guessing it had to do with exhaust holes affecting the downstream o2 sensor and another thing below. PS: I also had the EGR port plugged.


    hCLlbCg.jpg b8GvGJP.jpg

    Previous owners had a FuelLabs fuel pressure regulator, but I was concerned about what pressure it was set at. So I went to my local shop and grabbed a Radium gauge and a fitting. They did already install a braided line from the tank. However these couple pictures don't do the job justice, it was a royal pain in the ass to get fitment around my cam angle sensor, and to top things off, the AN fitting on the braided hose seized!!! so while tightening it, it snapped at the elbow. So I got a vibrant elbow and it worked out luckily


    Because I didn't know what other issues this car might have, I picked up an OBD logger that I could use on my laptop. I am a little disappointed with the lack of data it gives me, but it's better than nothing. At least I can check/clear codes, see the o2 sensor output and a few other things



    Almost nothing was holding the drivers side mount together.. and a broken brake cleaner cap.. the struggle.


    I bought the wrong oil filter for my Civic about 6 months before I got this car, forgot to return it, and it just happened to be the exact size for the Eclipse :D also made a quick gatorade overflow and coolant funnel.


    Finally a break! :thumb:

    yeah right.
    I started it up a few times, it was still running very rough and smoking a lot.
    I thought maybe it was just startup smoke, and maybe these 2.0's just run rougher than my Honda?!
    Eventually I realized the smoke was only getting worse. So back under the knife it went..


    The culprits? A paper towel drain plug I left in and got sucked down to the oil pan :ohdamn: and a broken injector clip wire that took me 6+ hours to diagnose, I even opened my ECU.. switched injectors twice, thinking I put them in the same order the first time.. busted out the multimeter in the end.


    New turbo drain gasket made, and a fresh metal one on the pan side.


    Also had an injector puking fuel after re-assembly, old o-rings were dry and cracking.
    New seal kit from Injector Clinic!


    you're a real champ if you've made it this far. MVPs



    Gotta keep pushing though. Time to focus a little more on the goodies.

    Attached Files:

    Last edited: Jul 27, 2020

    Street Build 168  1

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
    needsy and Helaman-99 like this.
  2. Yokai

    Yokai Probationary Member

    Joined May 9, 2020
    Denver, Colorado

    First things first, time to take care of my number one peeve. The foggy, faded headlights. DSM headlights are inherently nice looking, the black housing fits perfect into my panda theme. The condition of your headlights shows a lot about you as an owner in my opinion and the lights often draw my attention to a car before paint condition does.


    So what's next?


    How about exhaust?


    Thanks to yerfdog and youtube, I knew the mod I wanted most was the Thermal R&D exhaust.
    This was gonna make or break my build for me. What I didn't expect.. was how hard it would be to find.

    Yerfdog's thread was only a couple years old at this point, so I thought no problem. Pretty legendary
    exhaust for these cars. It was even the Thermal R&D logo for a while I think, at least on the order form.

    ExtremePSI out of stock. STMtuned discontinued. Amazon unavailable. Ebay unavailable.
    Called Redline360, discontinued. Nolimitmotorsport, discontinued. DSMparts, unavailable.

    Thermal R&D not answering calls, twice daily. Facebook says to email them. Email sent.
    Exhausted every google result, every phone number. Then Thermal R&D responded..

    They had a few left!!! Matt W @ Thermal added them to their website and I ordered immediately

    banana for scale.
    I also scooped a free 3" downpipe from a local member. Took some driving to fetch it but it fits great.

    The original Thermal bolts up to the stock 2.5" downpipe, so I had a 3" flange welded on.
    My dude Logan at CarZ performance near Denver did an awesome job, even without having the car.

    Then it turns out the cat converter on the free downpipe was rattling, so I lucked out and found a 3" GESI high flow cat converter for only $100! They're like $450 new, so that was awesome. New flexpipe and flange, also space for v-bands in the future if I want to run a test pipe. This cat converter muffled the sh** out of the exhaust, so don't expect any nasty audio clips, it's fairly tame. but I love it. It's perfect for talking to passengers or listening to music while still being rumbly, and pulls are very aggressive.



    Dat fitment doe!!!! Would ya' just look at it?? WOULD YA JUST LOOK AT IT?!!


    Temp tags, my first drive out. Hit the gas station to fill up on fresh 91, car wash, and a little cruise.


    Next!! When I picked up the midpipe from welding, I also got an Adam's 2-step polish kit..


    First step was to spray Iron Remover to dissolve all the metal fallout in the paint, a heavy amount...

    Next up was claybar, because of the iron remover there weren't that many particles in my clay
    But the soapy water I was using with the clay would turn grey, it was taking a good layer of residue off.
    It also got the mysterious drip stains on my trunk, and the rust stains from the headlights and sideskirts


    and top that all off with a little Adam's UV/sprayable ceramic coating.
    This stuff doesn't last as long as a regular ceramic coating, but it's easier and better than waxing.
    (just don't do a sniff test like I did.. :toobad:)


    at this point, most of my family was unaware of my car. The time had finally come to bring it out,
    and I couldn't be happier with it. putting some respec' on muh name. haha

    Last edited: Jul 15, 2020

    Street Build 168  1

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
    needsy likes this.
  3. Yokai

    Yokai Probationary Member

    Joined May 9, 2020
    Denver, Colorado
    Last edited: Jul 9, 2020

    Street Build 168  1

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
  4. jkuga

    jkuga Proven Member

    Joined Feb 12, 2017
    Silverton, Oregon
    Looks really nice. You cleaned it up real good. I always wanted an eg hatch but can't justify it on top of my GSX and daily. What are your plans performance wise? Keep it stock? Minor mods?

    Street Build 496  8

    1999 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Yokai likes this.
  5. JeffwithaG

    JeffwithaG Proven Member

    Joined Nov 30, 2017
    Flemington, New Jersey
    Beautiful car! I wish I had your level of skill and knowledge. I would love to have a fresh engine rebuild for my GSX

    Street Build 477  4

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Yokai likes this.
  6. Fyke

    Fyke Supporting VIP

    Joined Jun 8, 2013
    Englewood, Colorado
    Looking good! Nice to see another DSM around the Denver scene

    210  6

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM

    200  6

    1997 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM

    278  4

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Yokai likes this.
  7. Yokai

    Yokai Probationary Member

    Joined May 9, 2020
    Denver, Colorado
    Thanks man. Not sure which one you're asking but I'd like the EG at 200whp and the Eclipse with a 16g at 300whp. I'm not really a drag racer or anything, just want to bring them up to spec a little bit haha

    Thanks, one mod at a time.. lots of videos and reading. With the age of these cars the time will come. But having a shop do the work is not a bad idea either. Spending all your free time in a cold or hot ass garage like I did isn't always the best feeling haha and if things go wrong it's even worse.

    Appreciate it, yeah we have some good ones around here. Nocrust and Brady were big influences for me. You can probably catch me at cars & coffee or slush if I don't take my Civic.

    Street Build 168  1

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
  8. my98gsx

    my98gsx Supporting VIP

    Joined Aug 14, 2005
    Wappingers, New York
    Love the exhaust! Looking good. Keep the mods tasteful, this car is too nice to ruin! Best of luck

    Street Build 935  11

    1999 Mitsubishi Eclipse GSX
    563 whp · 422 lb/ft · 2G DSM

    952  4

    1999 Mitsubishi Eclipse GSX
    12.091 @ 114.490 · 2G DSM
    Yokai likes this.
  9. spyderdrifter

    spyderdrifter Freelancer

    Joined Jul 11, 2009
    Fountain, Colorado
    Did you at least check the block deck surface for flatness after using all the sandpaper? What did you do to keep all the metal dust out of the water jackets and oil galleries? Only asking since in your pics it only shows the head bolt holes plugged.

    1K  2

    1996 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    2K  3

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    2K  5

    1999 Mitsubishi Eclipse N/T
    automatic · 2G DSM
    Yokai likes this.
  10. Yokai

    Yokai Probationary Member

    Joined May 9, 2020
    Denver, Colorado
    Thanks!! I don't plan to do a whole lot externally. I think the car is pretty close to perfect. I did get a junkyard center panel to paint match, between the tail lights. That way I can keep my original one. Maybe a koni street kit (prokit springs), but the front bumper scrapes easier than I expected, and I like the soft ride so I might even keep the suspension stock.

    There's only 1 wheel that really has my attention but it's a secret for now. Kind of planning to do 18's with meaty tires, I really like the Toretto GSX fitment but I'm not sure what size tires he has..


    Good questions.. I don't have acceptable/good answers. but I'll do some subjective elaboration haha

    It's very difficult to take any amount of material off these iron blocks, comparing to my Civic's aluminum block. All I wanted to do is clean the composite residue and get a smooth surface, not much pressure is needed. The only check for flatness I bothered with was red sharpie and making a pass, like an inferior engineers blue, just to see how consistent it was, and all it did was mimic where the composite was. It was very easy to check for the composite to clear out consistently. Glass sheets are incredibly flat, this method is far better than using rolocs in my opinion.

    I plugged the big drains at the intake side. It's easy with the bigger holes, but I didn't want to risk getting paper towel stuck in the smaller drains on the exhaust side. I swabbed some vaseline in them and would reapply. A couple oil flushes and let the filter do it's job. To be honest I don't care about the water jackets haha, the amount of grit is really minimal, it's not like sanding down bondo or anything. If the three sandpaper sheets didn't rip from the adhesive, they'd still be good to use.
    Last edited: Jul 15, 2020

    Street Build 168  1

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
  11. Yokai

    Yokai Probationary Member

    Joined May 9, 2020
    Denver, Colorado
    Went out with the Evo club yesterday, GSX's sometimes show up and they allow it :dsm: gang. There was a 60k Galant VR4 there as well. really friendly group.


    Got some dope pics. for SEO purposes; 1998 Mitsubishi Eclipse GSX Panda White Black Wheels
    CJVsjId.jpg 79LN4DE.jpg

    Street Build 168  1

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM
    C-note89ky likes this.

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