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4G Eclipse GS/SE Specific 2.4L I4 (4G69) Specific Forum


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Old April 27th, 2020, 10:10 PM   #1 (permalink)
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Hi guys, I'm kind of knew to modding cars as this eclipse is my first car I owned with my own money. Shes a 2007 GS SE. Maintained very well besides some dings in the paint and some missing clear coat. Also I'm not sure if this is stock but it seems like the front exhaust manifold heat shield is missing. There's points to bolt one on so I'm not sure if the previous owner took it off or it didn't come with one. I tried finding an OEM cover but they are discontinued through Mitsubishi. Thank you guys so much for this forum by the way! I didn't my first ever car mod because of you guys (Throttle Body Bypass). Love the humor and support!

Last edited by Walketfretts; April 27th, 2020 at 10:13 PM.
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Old April 27th, 2020, 10:22 PM   #2 (permalink)
140whp+15.72%= 162hp
 
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Welcome! Do you plan to upgrade your exhaust manifold? Usually people tend to remove the heat shields near the cats because over time they tend to break and cause a rather annoying rattle sound. The front shield covering the entire piece makes no sense to remove other than weight reduction. I did find mine a tad annoying when dealing with my O2 sensors. But i never removed mine til i upgraded to RRE Headers.
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Old April 27th, 2020, 10:26 PM   #3 (permalink)
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I do plan on Installing RRE headers when I can afford it haha. Working a partime job doesn't pay for car mods. More than anything I like the look of the shield because it adds a little bit more order to the engine bay. Are there any after market covers? Anywhere to buy OEM ones?
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Old April 27th, 2020, 11:14 PM   #4 (permalink)
140whp+15.72%= 162hp
 
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Got ya. The Market section of the forum might accomodate your header needs. I think i read a guy selling his for way less than 480$ RRE price. As for the shield your best bet will be the junk yard. Also maybe Sabertooth^2 may have one for sale.
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Old April 27th, 2020, 11:26 PM   #5 (permalink)
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In all honesty, I may still have my original one. You know me well. I cut up my stock manifold for some piping when making my turbo manifold, lol


Honestly Walketfretts, from a functional standpoint, its purpose is to stop people burning themselves on the hot exhaust. Looks wise, I feel that if you grind the mounting points off and painted the manifold, you'd have something much nicer.



I'll check none the less though, as everyone is allowed to have their own opinions, and it's most important that your car makes YOU smile, not the world. If I have it, I'll send it out for just shipping cost. That'll be from southern Ontario
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Old April 27th, 2020, 11:39 PM   #6 (permalink)
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Quote:
Originally Posted by Sabertooth^2 View Post
In all honesty, I may still have my original one. You know me well. I cut up my stock manifold for some piping when making my turbo manifold, lol


Honestly Walketfretts, from a functional standpoint, its purpose is to stop people burning themselves on the hot exhaust. Looks wise, I feel that if you grind the mounting points off and painted the manifold, you'd have something much nicer.



I'll check none the less though, as everyone is allowed to have their own opinions, and it's most important that your car makes YOU smile, not the world. If I have it, I'll send it out for just shipping cost. That'll be from southern Ontario
You're the best Sabertooth! Maybe I can i ask you one question though. I was reading on the forum and I heard of a GT throttle body swap with the GS. If I buy the GT throttle body is it as simple as taking the old one out and bolting the new one on? Will it fit properly? Will the GS intake piping even fit?
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Old April 28th, 2020, 09:22 AM   #7 (permalink)
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You'll need a tune for sure to make it run proper at wide open throttle, it's known to tuners that it reduces power otherwise.

As for if it'll give any gains on a GS, the math supports no, and the science suggests that you'd need a ported intake manifold to not lose power from it
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Old April 28th, 2020, 11:16 AM   #8 (permalink)
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Quote:
Originally Posted by Sabertooth^2 View Post
You'll need a tune for sure to make it run proper at wide open throttle, it's known to tuners that it reduces power otherwise.

As for if it'll give any gains on a GS, the math supports no, and the science suggests that you'd need a ported intake manifold to not lose power from it
Yeah im not even going to bother with the swap haha. Might just send it out to get bored out a bit but other than that it's just fine.
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Old April 28th, 2020, 12:23 PM   #9 (permalink)
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Boring out the GS throttle body will have the same affect as using the GT throttle body. Bad.

A throttle body controls airflow into the motor. Air will flow up to the speed of sound. The speed of sound in a fluid is determined by density. If you're running a lot of vacuum, you'll need a big throttle body to keep the air able to flow at a high enough velocity. This will be a very poor performance engine.

If you have low vacuum or boost, you can go with a smaller throttle body, as the speed of sound in that fluid will be higher.


Optimally, you want your throttle body as small as possible without hitting the sound barrier. This will give your air the most inertia, allowing for the highest density air to be taken in, and highest volumetric efficiency.

Changes in throttle body size also require changes in intake manifold design, not just size, as you're adjusting a tuned system. As intake valves close, the inertia of the airmass moving in hits it, and is deflected back, creating a zone of higher pressure. When matched right, you'll then intake that higher pressure air from the runner (it must not enter the plenum) when you're at your desired RPM for peak torque range. When the airmass is no longer able to be deflected back, or is deflected back into the plenum, you're outside of the intake manifold's optimal range for peak torque.

This also needs to be tuned with the exhaust setup, cams, intake valve size, port angling inside the head, compression ratio, stroke, bore, etc. It's a very complex system, as EVERYTHING must work together, and intake problems have a chain reaction down the line to ruining everything.

Nobody has tested and seen a GS make more power on a larger throttle body. No tuner supports it. The math isn't there. The science doesn't support that the single change is good. It's just worth skipping.
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Old April 28th, 2020, 04:42 PM   #10 (permalink)
140whp+15.72%= 162hp
 
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So for information purposes. Upgrading to a GT TB without a tune makes you lose power? But it's ok after it's tuned? Or is it bad period?
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Old April 28th, 2020, 04:56 PM   #11 (permalink)
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Before a tune, bad.

After a tune, may work with proper supporting mods.
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Old April 28th, 2020, 05:41 PM   #12 (permalink)
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pcfreak4 has a spectacular aura about
It’s gonna be pretty bad unless you have major engine work and probably boost too
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Old April 28th, 2020, 07:11 PM   #13 (permalink)
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Scroll up, I explained why with boost you don't need it.
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Old April 28th, 2020, 10:09 PM   #14 (permalink)
140whp+15.72%= 162hp
 
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I still have my GS TB. Should i swap it? Alex already took my ecu reading and is working on my tune with my GT TB.
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Old April 29th, 2020, 08:40 AM   #15 (permalink)
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Which one has the higher average MAF reading over a pull? You'd have to data log, and use spreadsheet functions to see. But that'll tell you which makes your car faster
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Old April 29th, 2020, 10:02 AM   #16 (permalink)
140whp+15.72%= 162hp
 
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Havent explored data logging yet. Dont know how to do it with Fastworks since i just set it up yesterday.
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