Larger throttle body and injectors in my 94 SL? Help me learn please :)

[opy01]

Thanks Adam, that's what I was thinking but with others saying there is no point to upgrading the injectors I was just considering replacing with stock. I was going to email you but I figure I'd bothered you enough for now and would post here to see if it was even worth it plus get some other info as well. The problem with stock is I'd have no reference for the latency table for the ECU. I know it is supposed to have the stock values in the ECU already but the file you uploaded had 227 for injector size and these are supposed to be 210. I'm not sure if the latency on these will make any difference at all or +/- 2% or larger or if I'd even notice but I'd rather be able to put documented values in there for the best tune possible.

I'm still waiting on the order from 3SX and now I'm wondering if there were other parts they had to get in first besides the ECU. Maybe they'll be shipped this week (fingers crossed).

[Jesters Deadd]

I would get at least vr4 inj. Easy upgrade. Those numbers in the file are straight from Mitsubishi. So you have the stock settings for stock inj. What is wrong with your inj? Why not just clean em?

[opy01]

I've been searching and the best info I've gotten is send them off to get them cleaned by a pro. It's a DD so I cannot send them in and have nothing, that's why I was just going to order some and have these cleaned. I didn't want to tune my car with clogged up or dirty injectors then eventually get them cleaned or replaced and have to retune it with proper running injectors. They have been sitting for 2 years not running so I know they have to be a bit gummed up. Also the filter has not been changed much, maybe one or two times. In fact, I'll be scrubbing my plenum and TB clean as well. As far as cleaning them myself, I've only seen a couple of things talking about injector cleaning kits that you attach to the fuel rail and unplug the fuel pump fuse then run your engine on that stuff. I've read that using some of that stuff can break crap loose and cause the injector to stick open some. Back in the day I used to use that on other peoples cars but when the boss says to use it you really don't worry about what it could do, you just get paid for doing it lol. Then again I'd put O'reilly oil in cars for oil changes and wouldn't get that stuff near my car. I did however put an O'reilly clutch in my car. Biggest mistake of my life... except that one girl... but I digress. Now that it's my car I get paranoid about using those harsh chemicals in the fuel system. Without pulling the injectors out to clean, is there anything you personally recommend that does a good job? I do put Sea Foam in the tank periodically as well as in the oil (factory lifters still sound great most of the time when using that stuff).

Also, those numbers straight from the factory don't match what I read everywhere lol. I'm not trying to say anyone is wrong but the factory numbers in the ECU say 227cc and the injectors say 210cc. Odd.

[vr4tune]

Turbo intake manifold helps too I heard! I'm not a NA guy but have read that many times.

[opy01]

Interesting. I've read the same about the aftermarket plenums. I wonder if it's how the air flows through them. It's hard to wrap my head around the concept that a TB will not help but the parts between the TB and block will lol. I wonder if you would need larger valves or bigger bore for either of those to even matter.

The NA upgrade bible is nice but doesn't give much details of why/how it works, like the plenum.
Stealth316 has tons of good info but is kind of hard to navigate. Good thing there is a search feature that's better than forum searches lol.

Thanks for all the posts guys, I'm soaking all this in and doing lots more research!


Adam, just to go back to what I said earlier about numbers not matching, I saw someone referenced 220cc stock injectors. Now I've seen 3 different sizes referenced lol. I'm just going to try to get some cheap TT injectors and have them cleaned by a pro and call it a win

[stealthee]

Stock NA are 210. I have seen people misstate 220 many times.

[stealthee]

Stock NA are 210. I have seen people misstate 220 many times.

[TUFFTR]

First of all decide if you want to keep the 3L
Best bang for buck by far is the 3.5L replacement.

Intake manifold I would use the Mitsubishi 9th gen Galant manifold, with the rear half flipped and welded back on.
Myself, I am also running an RPW 70mm bored TB, DR 272 cams, Extractors, 3" catback, Chromed ECU, AEM MAF style Meth Injection, with the lower/upper mani ported out, and the stock 240cc (remember, 3.5L) injectors re-co'd.
TT mani is good, this manifold has a proven 10HP on the dyno.


i.e. $500 on extractors for the 3L? or $600+ for custom extractors for a 3.5L?
$1500 will get you a 3.5L and you will LOVE the torque increase.

[opy01]

I'm planning on rebuilding in the future so the 3.5 is definitely on the table.

That is a nice setup you have. I do miss my '01 Galant, although my wife never did like that car since we got screwed on the financing. We were a lot stupider back then and in desperate need for a car.

This is what I had, color and all. It was a fun car but I needed something larger at the time as I was starting a business and it would have been destroyed. So I bought a Montero Sport in '03 (loved the 3.5L) and actually just sold it with 214K miles on it and it was still kicking strong. We used that money to go back into0 the 3S

[Ange]

why sugarcoat it. if you want more performance buy a vr4...

no point in wasting money for performance on a n/a to gain what 20-30 hp?

benefit of the n/a is as a daily driver with automatic and better fueleconomy.