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Discussion Starter · #1 ·
anyone know of any upgrades for the 1.5 example >cam header intake timing gear injectors chip or computer? anything would be helpful<img src=/images/forums/snitz/approve.gif width=15 height=15 border=0>


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What up jerzyman,
Our options are somewhat limited, but none the less, there are options. First of all would be a DIY CAI since no one makes one for us. All the better, because it can be done rather inexpensively with a K&N replacement filter and a decent cutting tool. Check this out:

www.vfaq.com/mods/filter-print.html

Once you do this you can run a piece of flexible hose from somewhere on the front bumper to just below the open cone filter that will deliver a nice steady supply of fresh air. I had a link that showed some good photos of this, but I can't seem to find it - I'll post it as soon as I locate it.

RPW out of Australia makes a header for our 4G15...

http://apparts.netfirms.com/pictures/RPW/4G15-header.jpg

I haven't seen any cams or pulleys yet...
I think Venom may make some upgraded injectors & a fuel pump for us...
Not sure on a chip or ECU...

Be sure to search for stuff on early non-turbo Mitsu Mirage & Dodge Colt since they have the same drivetrain.

In less than a month, I will be in Jersey tearing into the 91 Excel that is there waiting for me, and I'd be more than happy to collaborate our efforts...

Jersey Pride!!!
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Discussion Starter · #4 ·
thanks pucci<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>youve been a great help.and sure i wouldnt mind lettin ya know anything i find out and what kinda of progress i make with any upgrades. im gonna try my best to get this engine in the 13 second range even if i have to build another 1.5 from the base up. first i figured some more compression would help an porting of the intake and head etc...thanks again bro<img src=/images/forums/snitz/finger.gif width=33 height=15 border=0>


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Yeah the excel isn't the greatest for tuning. But you can make it stand out. As far as turbo is, you would need to get the engine machined for another valve. I looked into it a little bit with RPW. That would make it 12 valve. I believe they say its for the intake but I don't know for sure. Try talking to a RPW rep. they'll give all the insite on the expensive upgrade. I'm going to be doing the DIY CAI in a couple weeks after it stops raining, I'm going to run down to the junk yard and pick up at Airbox off of an excel there and I'll keep you all posted on how well it works.


<hr width=60% noshade size=1 align=left>Timothy Zacher
1991 Excel Evo II Rally Project
#346 N
Des Moines, WA
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I have done it on my previous Scoupe last summer i did find a diff in the power bit the dann car fall apart before i coult really test it <img src=/images/forums/snitz/disapprove.gif width=15 height=15 border=0> anyway it had a big fackin induction noise ... almost like the AEM setup on my friend civic

also try retard the spark shoule give u more RPM i now shift at 6750 instead of 5500-6000 dont realy recall

Btw is it possible to fit a cold air from a eagle talon or something like that since it have too a maf ( i think )

<hr width=60% noshade size=1 align=left>Next Time I'll remove the E-Brake :)

Edited by - phrenetik on 02/03/2002 6:55:21 PM
 

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here's a handy hint: If you want someone to answer your questions please dont use 'moon talk' & broken sentences. Impress us with your writing style, but make it legible.

The quality of what you put in will be reflected by what you get back.

There is absolutely nothing wrong with the 8v head on the G4DJ (X2) motors. Now the G4AJ (X1) head is a POS because of its tiny inlet ports. The 12v heads only advantage is that it gets slightly better top-end breathing a the sacrifice of low-end torque.

My X2 is only slightly modified internally. The head has been ported enough to clean up irregularites and I have removed the jet-valve casting burrs from the combustion chamber. I did all this when I blew the head-gasket and had the head shaved 15 thou.

I advance the ignition timing 3' & always use Premium unleaded.

The Mirage over here has a 12v head on the 4G15 bottom end and they are absolute slugs so I cant see why Dave reckons their so good.

I just wish I never traded my old 4G15 that I had in the X1. That had ~$1000 worth of head work and lived for 6000+ rpm.

FYI - X1 flat top pistons used in an X2 engine (dished pistons from standard) gives a sizable increase in compression without pinging. IMHO this mod by itself will give you the most bang-for-buck possible. Raises compression to ~10.2:1. That mod by itself was probably the reason why I broke the transmission so often. Lots of torque, the motor could have done with a cam to wake up the top end and produce a little more HP.

BTW - with the small amount of mods on my X2 it is still alot quicker than a stock 12v or 16v Excel/Accent. Especially in top end.

I will have to take the X2 down the drags when I finally get the X1 down there and roll off a few times so you guys can see where Im at with it.


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BTW - there are many Mitsubishi/Hyundai cars that have much larger TBs than the X2 but still have to same bolt pattern and general mounting.

By boring out the manifold to match the larger TB (this can be done with a half-round bastard file), this is a cheap simple upgrade.

Dont go too large though. There is a limit to how far you can make the hole bigger in the plenum.


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xlr8 you are my savior man. i want to know will the rpw extractors will fit the first gen scoupe or not and when i get my engine will need rebiult(maybe a while) i will use the flatops. and do the head work. can you give any other mods i can do. this spring will be the bolt on mods as well as porting the intake manifold and bore out the throttle body. so thanks giving us this info.<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


<hr width=60% noshade size=1 align=left>i give the honest performance facts and if i i don't know it i will tell you because i am not some riceboy*****
 

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Yes the RPW extractors will fit. The Scoupe and Excel X2 share the same floorpan & chassis - ie they are the same car with different body panels. I have driven both and they drive exactly the same its uncanny.

Those RPW extractors do look nice. hmm, too bad Im broke from spending on the X1. I'd recommmend having them ceramic coated to make em last longer & stay looking good. Hooked up to a 2.25" glass-packed exhaust would be ideal.

With X1 pistons, cam, porting/matching, oversize TB, exhaust & Unichip your in Beta swap territory. <img src=/images/forums/snitz/smile.gif width=15 height=15 border=0>


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xlr8,
thanks for the info and one more thing. which version of the 4g family is in your x1. i am considering on a 4g swap a little later but i might be getting this 1st gen mitsubishi eclipse and fixing it. i will get it for cheap from my mechanic. the timing belt snapped and dropped the valves but the bootom end is very solid and not a scratch. it is non turbo and i will make it turbo with pistons for one thing and the other necessary hardware for the conversion. i just wanted some info on the little 1.5 so i can open up the restrictions. so keep on tuning


<hr width=60% noshade size=1 align=left>i give the honest performance facts and if i i don't know it i will tell you because i am not some riceboy*****
 
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