new guy needs help

[adbramsay]

hey guys,
i am new here, my name is alex and i am from the bahamas, where i still live. there is a large japanese car culture here, including the most popular evos and skylines. i chose to get a 1993 jdm Galant VR4 (auto unfortunately). it was just so different not an economy car a sedan with good power and great handling. the motor is a 6A12TT, however i took off the twin td025 turbos (the smallest that i have ever seen, smallet than the gt12 i saw on a motorcycle) and replaced them with a single t28bb turbo. i routed the rear exhaust gasses over where the rear intercooler plumbing used to be. i also replaced the stock intercooler with an intercooler off of an evo III. i was wondering if the engine was good for 15psi of boost? and if so how much hp would it give me? it comes stock with 175whp rating. the whp rating i gave you on 10 psi is a pure estimate on other ppls experience, any help or info would be great

[Donovan]

Hey , I surely dont know the answer but to get it answered , I replied so it can be seen

[4-G-rim]

Not too many members here have alot of exposure to 6A12TT here in the states since it was never equipped in the E5 chassis (7g) Galants. Those motors should be able to handle 15psi of boost all day long...they are probably good for up to 20-25psi in the stock internals. The stock front mount on the EVO's are way better than the side mounts equipped on all other turbo'ed Mitsu's. The EVO front mounts are known for having really good flow for stock intercoolers...so you should gain a good amount of power for switching to a FMIC. Not sure what your power gains should be...but I am assuming by what you did already, its better than stock. Those 6A12TT came stock with only 175 bhp's?....that is weak considering its a V6 and turbo...I always thought those motors came stock with well over 250 hp's?

[adbramsay]

thanx for the responses, 20-25PSI all of that, that is more than i thought, i thought that the max would be 17-19PSI. and the whp is the measurement at the wheels, remember the 4wd and the unfortunate auto tranny really sap hp, it is rated at 240 at the crank, and judging by the wrx which makes 170 at the wheels i figure mine isnt that far off. any other performance mods can you think of?

[4-G-rim]

Well you started off pretty well with a single large turbo and a FMIC and hard piping. Of course I would run a 3" diameter exhaust to aid in more power. I would consider maybe larger injectors...and if so, I would invest in a Air/Fuel controller like a Apexi SAFC or a Blitz A/F controller..but the Blitz ones are pretty $$$$. I would also probably look into maybe reflashing the factory ECU....it should be easy since most mid to late 90's Mitsus have EPROM ecu's.

[adbramsay]

sorry i forgot to mention that i have a custom 3 inch exhaust pipe, de-cat as we have no regs concerning pollution control here. i had a apexi super afc II, however that had an adverse effect as it promoted det. maybe i had it too lean high up in the rev band, but from what i can see the stock ecu does a pretty good job of keeping things in line and on the safe side of things. in nassau, the bahamas capital city, we dont have any proper equipment to test tuning results so i rely mostly on ppls advice. what do you suggest, try the safc II again or try a stand alone unit? i will be eagerly wainting your info

[ako]

What, if any, upgrades have you done to your fuelling? Stock injectors are well and truly maxed out at 18psi on the stock turbos, on something bigger I'd say you're at your limit already. Try asking on www.nzmmc.org.nz, or www.msport.co.nz, we've got heaps of these cars, and some of us have done single turbo conversions... Stock turbo setup is still proving quickest on a stock ecu https://www.thegalantcenter.org/style_emoticons/default/laugh.gif

[adbramsay]

the reason why changed the twin setup is because one of my turbos disintergrated. you cant find a replacement turbo here, parts are really limited. the td025 if i understand correstly is a ceramic turbo. all my experience with ceramics has been bad, a friend of mine has a skyline gts-25t type m coupe with a t28 ceramic turbo, and his blade unbalanced like mine. maybe it is the climate and humidity living on a really small island. alot of salt gets into everything here. what are the stock injector sizes? are they low or high impeadence? what should i replace them with? any more info, and what about the fuel pump? does that need replacing too? sorry for so many questions, i just really need help!

[know_fun]

my guess with 15psi you'd b pushing about 250horsies and your torque would be around 220. if i remember correctly the td28 gives you like 50% gain or something. again this is a guess.

[ako]

The stock fuel pump is just out of the mitsi parts bin, looks like an evo 1 number - flows about 150l/h max, in other words - not enough https://www.thegalantcenter.org/style_emoticons/default/tongue.gif Try and hunt down a supra TT fuel pump, or just go aftermarket.

Stock injectors are 275cc, and in theory max out at around 320 odd hp. HOWEVER, mitsi do run their cars stupidly rich from factory, so if your a mechanical sadist like myself, you can crank a bit more out of them without leaning out. Failing that, you can use almost any injectors from any other turbo mitsi - my first option would be the 390cc ones from either a lancer GSR or a GTO / 3000GT, they fit straight in. You will need to play with your fuelling a bt though, itll be running hell rich with them in.

You're the first I've heard of the turbos being ceramic wheeled, you're wrong on that part. The rear one is very prone to overheating though - as you found out :? . Even though they are REALLY tiny, they are still capable of around 350hp worth of airflow - or in other words, low 12s AND full boost by 2800 rpm :twisted:

Be careful on these engines - they are quite strong, but the rods on them aren't. They are just plain tiny https://www.thegalantcenter.org/style_emoticons/default/laugh.gif So play it safe when tuning and you'll be fine.

My advise with the tuning - yes, the safc-II can do the job just fine, but with the stock injectors you should be going richer, not leaner! Also youll be changing your ignition timing without meaning to using this, it can get you into a world of trouble if you don't know whats going on. The Greddy e-manage is a good, cheap bit of kit and should be sufficient for what you're doing, if thats the road you want to head down.

You going to keep the auto box in it?

[ako]

<div class='quotetop'>QUOTE(know_fun)</div><div class='quotemain'>my guess with 15psi you'd b pushing about 250horsies and your torque would be around 220. if i remember correctly the td28 gives you like 50% gain or something. again this is a guess.</div>

Where did you pull those figures from? A stock 6A12TT runs 240hp, auto is detuned to 200. 15 psi on a decent turbo and I'd say more around the 300hp region is a bit more realistic. 15psi on the stockers equates to very low 13's in a 1450kg car, its a bit more than 300!

[adbramsay]

275cc, wow that is small, not what i expected at all. well i guess i should look elsewhere for new injectors.

ignition timing you say, well then it is running fine now, i have always found you should never mess with timing unless you are going from n/a to turbo/supercharging.

are you sure they aint ceramic, take another look i bet you will find that they are. and there is no way that it was pushing 350hp, i was maxing out at 14psi with no spike using a good boost controller like my profec b.

about the auto box, its all i got no options here to change it, plus it is just an interim thing so i can get a new car, more than likely an evo or an 8g vr4(skylines are just plain common down here, like 9 gtr's and 30 gts 25t, also the sti are prone to det)

[ako]

No, you misunderstood me. What I said was that the turbos were capable of 350hp worth of flow - (If not, explain how I managed those trap speeds on a full weight car), not that yours was putting that much out. Also the auto models turbos are different to the manuals, that could explain the differences.

If you've got questions about this engine, try asking on a site that actualy has them - like www.nzmmc.org or www.msport.co.nz. This site specialises in either 4G64s or the larger V6's, the 6A1X engines are not common in the states AT ALL. Failing that, learn japanese https://www.thegalantcenter.org/style_emoticons/default/laugh.gif

Timing adjustments can net you HUGE gains in power (I.E 20-30hp for $0), if you do things properly and keep an eye out for detonation.

My advice - check those sites out, they are full of the info you're after. We've been playing with these cars for years and theyre as common as as civics. Mod wise, get a datalogger (one suited for a 3000GT / GTO works) and THEN see whats holding the car back. It'll tell you if you're getting knock, how hard your injectors are working, hell, everything the car knows, you'll know. Once you've got that, THEN start to play :twisted:

[adbramsay]

i would like to do alot of the things that you keep telling me, but the biggest problem that we have here is the fact that we dont have any real testing equipment here. can you recomend a datalogger for me to try to pick up. also do you know some safe timing advances i could do that would give me some hp increases. oh one other thing, our fuel here is pretty bad it is about 88-90 octane, that could make a big difference.

[SamirDarji]

The datalogger would be great when coupled with a Gtech Pro. www.gtechpro.com. I use it for all of my tuning.