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49erGizmo

5+ Year Contributor
86
12
Nov 3, 2017
Cedar Park, Texas
DSMer, I need help understanding a car I might buy. This Car is a 4G63T GSX and is having problems. The whole car has aftermarket parts so no OEM and has been modified by different owners..

Question: The problem is that the car won’t go over 4,500 .

A shop said it might be because it needs a new aftermarket Cam Sensor. What do you guys think?
 
I recant my recent statement in regards to it being worth 3k. Defiantly more. I'd ask specifically which turbo as 57 trim isn't very specific and it could be a cheapo cho cho. I dont know much about AEM but it could very easily be a tuning issue of some sort. Also, auto or manual?
 
That's about a 4k car; maybe less depending on how nice the body is and what wheels.
I'm gonna say the same for an incomplete improperly running car. You can't prove anything is good unless it can stand on its own consistently. Even if it was great 15k still sounds high unless this were a super nice properly sorted car. No rust. Clean paint etc.
What are your plans anyway? That's the most important question. What is your skill level when working on cars?
 
I recant my recent statement in regards to it being worth 3k. Defiantly more. I'd ask specifically which turbo as 57 trim isn't very specific and it could be a cheapo cho cho. I dont know much about AEM but it could very easily be a tuning issue of some sort. Also, auto or manual?
Standard

I'm gonna say the same for an incomplete improperly running car. You can't prove anything is good unless it can stand on its own consistently. Even if it was great 15k still sounds high unless this were a super nice properly sorted car. No rust. Clean paint etc.
What are your plans anyway? That's the most important question. What is your skill level when working on cars?



My skill level is the basic bolt on and off, I have no experience in tuning or any other electrical circuitry experience just mechanical...

What I am looking for is a Clean powerful daily GSX 95-99 2Gen Eclipse. That is my dream car. I have had my share of DSMs 1-RS-420A N/A 2-GS-420A-T 1-GST-convertiable-4G63T and 1-GST hard top 4G63T

My Goal is to Own a Bad Ass Clean-2gen-GSX-Eclipse and keep this DSM till I die..

That's my Goal...
 
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What I am looking for is a Clean powerful daily GSX 95-99 2Gen Eclipse. That is my dream car. I have had my share of DSMs 1-RS-420A N/A 2-GS-420A-T 1-GST-convertiable-4G63T and 1-GST hard top 4G63T

My Goal is to Own a Bad Ass Clean-2gen-GSX-Eclipse and keep this DSM till I die..

That's my Goal...
This is my advice.
Find a clean car. Do not buy one that heavily modded. If you intend to build, modify etc and make this a hobby then you have to learn to walk first. I say this after doing this for nearly 30 years. Jump in feet first and you will be constantly frustrated and broke.
 
Honestly, not to be rude, just being real... If you aren't pretty well acquainted with cars/diagnostic work, thats probably not the DSM for you. If your pockets are deep enough, paying people to fix your car is always an option, but that takes some deeeeeeep pockets. @pauleyman is giving very solid advice

I wont go as far as saying that collection of parts is only worth 4K, because it seems like a lot of good stuff if its all in good shape. That said, sorting it all out when something is modified (and you didn't do the modifications yourself) will take a great deal of skill, knowledge, and time. Time is the expensive part if you aren't skilled or knowledgeable. My time billed at $95/hr when I quit wrenching...

Ask yourself why they would sell it before getting it running properly..? To me it means they 1) are hiding something 2) dont know what they are doing - suggesting there may be more hidden issues 3) are giving up because they gave it all they could, and still couldn't figure it out.

Now, people on this forum can be amazingly helpful and just awesome, BUT, nobody here can fix the car for you. Some may help you step-by-step in trying to diagnose issues, but please be aware: you need to do your homework up-front. If you come in asking about things you should have researched on your own, you may get a less-than-stellar response on this forum.

I have to agree with Pauley, a less heavily modified DSM may be a safer starting point for you and has a much higher probability of success.
 
The Question I sent to the owner / Shop

Is it maybe hitting a set rev limiter? Does the car have ECMLink for tuning?

Sounds like a massive boost leak. If the car is on the stock MAF and there is unmetered air coming in somewhere it could do what you’re describing

If it's exactly 4500rpm, and won't rev over that in neutral, then it's probably a rev limit. Maybe the clutch switch is stuck and its trying to use launch control?
 
Time to familiarize yourself with what all of that actually means if you want to continue with the idea of buying this thing!

For starters, the mod list you provided says it uses AEM engine management system, so it does NOT have ECMLink for tuning. Its scary for some of us that you think you should buy a car that has a standalone engine management system before you know what a standalone engine management system is.

That said, the 4500 rpm limit does sound like a launch limit, and the vehicle speed sensor should be verified as working to confirm this is not the issue. I dont know if AEM would control launch RPM by VSS like ECMlink, but it probably does...? Hint, if your VSS isnt reading, the ECU never sees over 5mph and never lets the engine rev over the set launch limit.

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I have to reaffirm my position that this is not the car for you! It honestly sounds like you are years away from being able to handle it without paying people to work on it constantly. I guess you could buy it if you hate money and driving your cars around.
 
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I hate to discourage you from DSM's! They will provide you an opportunity to learn and develop your skills. We all just want to see you be successful, and we know that a simpler car is better suited for novices (again no offense intended, we are all still learning). Just the AEM engine management system alone is a very heavy topic*....

If you start with something mild, it will still be a very fun car, and has the potential to become whatever you desire as you learn. In the end you might spend a little bit more building it yourself over time, but the knowledge and skills you acquire will pay dividends on other projects, car related or not! And the absolute best part of DIY'ing the whole thing... you will be an absolute expert on your own car! You will never have to rely on expensive mechanics to fix your issues, and the personal satisfaction of fixing things is, for me personally, off the charts!

Good Luck in whatever you decide!
 
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