The Central Hub for DSM Community and Information

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. This is where the DSM platform history is documented and archived. Log in to help us in our mission, and to remove most ads from the browsing experience.

Post a Question

Max boost on a 18g

Please Support Rix Racing

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

dsmdeliveryboy

dsmdeliveryboy

15+ Year Contributor
2,051
5
Aug 14, 2007
Medford, Oregon
Ok so I'm picking up a 2G GSX with a 18g, Evo 560's, Walbro 255, and a SAFC and I was wondering how much boost I'm looking to be able to run with that. The car is currently untuned, I will be fixing the little details and then get the car ready to be thrown on a dyno.
 
Depends on the rest of your setup, how strong your actuator is, etc.

Generally speaking, if you're working toward the max boost on any compressor you'll crank up the boost a little at a time until you see airflow level off. That's the max boost level you'll want to run before it starts pumping nothing but hot air.
 
The rest of the setup is a Greddy 24V fmic, HKS 272's, FPR, FP 4" intake, Mishimoto radiator, HKS turboback, and a ACT2600 and the fuel mods listed above. The turbo is a FP18 with the 34mm flapper and it has all been ported and it has the 14psi actuator. The manifold and o2 housing were ported as well.
 
I heard that an 18g isn't in its power range until your at atleast 22psi+, I'm afraid with the Evo injectors I'll only be able to obtain like 17psi of boost and I won't be able to upgrade to link and 1000cc injectors for awhile..
 
I guess the car has been up to 18psi without knock untuned, but that just scares me a little for some reason. I don't know what the IDC was or anything.. I would be able to use Evoscan with the car to datalog wouldn't I? I also have a WBo2 I'll be throwing in.
 
^^^^ I dont know about that, but when i had my RC 550's i was at 103% IDC at 18 psi and that was with the fpr set at 40psi. I got rid of the injectors and i am now running 1050s and e85. Its night and day difference so i would suggest getting bigger injectors and link for best results.
 
I said 19-21 since my crappy internal gate wont let me have stable boost. I run another log tomorrow after I install my external and see what it says.
 
Boost pressure really is application specific when referencing air flow. Every car is setup, or rather optimized differently. Some much better than others. So 19psi on one guys car even with the same turbo may have less actual air flow than some one at say 16psi. This would obviously effect the demand for fuel from the same injectors as well.
 
With my setup it was spiking 27psi tapering to 19 by redline. Couldn't tell you an IDC, but I have 850cc and a 255 so it wasn't high at all...
 
dsmdeliveryboy said:
Why were you spiking so bad? From it being internally gated?
Click to expand...

The internal WG needs to have a strong spring to hold the pressure. There are other threads about this topic and works well if you dont go too high but external is the best way to go. My 18g would spike the same to 27 or so and settle at 18-19psi.
 
jusmx141 said:
We could; although if you have a junk 14B/16G actuator that I can rob the base bracket from it would save you some money...otherwise I'd have to destroy a good working actuator.
Click to expand...

I have 1, but the hole on the end of the arm is drilled out to fit a ebay 7cm housing and I don't know if that matters.. If not, I can find another one easy.

Got a few pics of the car yesterday, they're kinda crappy because they were taken from a cell.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

You must be logged in to view this image or video.


And a built SR20 powered Nissan 510 :D
You must be logged in to view this image or video.
 

Attachments

You must be registered for see attachments list
I need to use the end of the actuator arm that fits the turbo as well, so it would be best to have a junk MHI actuator....although I could fab something if necessary if you just want to send the knockoff actuator.
 
This is what I have, the part circled in red is what I had to drill out to make bigger so it would fit.

You must be logged in to view this image or video.
 

Attachments

You must be registered for see attachments list
Add Value - Be Respectful - No Trolling - No Misinformation - Participate Often!

Similar threads

EagleTalon1991
Boost Max On A 14b
2
Replies
29
Views
5K
bartels903
TalonSpeed
E16G Max Boost on 2.3
Replies
14
Views
3K
TalonSpeed
TalonSpeed
yepes281
Max boost on TD06h 20g
2 3
Replies
69
Views
31K
burkgonzo
burkgonzo
14b on 2g max boost?
Replies
13
Views
2K
BGRIPTP
BGRIPTP
v8s_are_slow
Buschur 20g. Max boost?
Replies
5
Views
4K
v8s_are_slow
v8s_are_slow
Boosted Fabrication
ECM Tuning
ExtremePSI
FIBA Motorsport
Fuel Injector Clinic
Innovation Products
Jacks Transmissions
JNZ Tuning
Kiggly Racing
Morrison Fabrications
Rix Racing
RockAuto
STM Tuned
Support Vendors who Support the DSM Community

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top