1.8L turbod finally. posting link in dissbeleif

[ginsu417]

As far as making an adapter, it's not as hard as people think. All you need is a mitsu 3-bolt flange, a mitsu 4-bolt flange, and a length of exhaust tubing. Cut the exhaust tubing to about 3", grind the ends off at a 30 degree angle, weld the flanges on and that's it.
_____
_____) <--- manifold
¯\ \ \¯ <---- adapter
/¯¯¯¯/ <--- turbo
( ( X ) )

 

[compression]

that doesnt look very hard at all nice . well my turbo still hasnt come in yet so im still waiting for that to come so i can hook it back up imna go to a few junkyards see if i cant find me a colt .. is the colt turbo better then the 14b? doesnt look like it but you never know

brian

 

[compression]

and how did you make your manifold?

 

[ginsu417]

With a welder.

The G32B colt turbo sucks. Very restrictive and not efficient. Best result come from opening up the hole in the manifold, and using a larger turbo.

 

[compression]

hmm what turbos bolt rite up the the colt manifold jus the colt turbo??

 

[ginsu417]

the 3000GTs use the 3 bolt flange as well. upgraded 3000Gt turbos can usually only be purchased in matched pairs, however.

 

[compression]

well id hafta make the adapter anyways so i could put any flange on it i guess

 

[1.8laser90]

ginsu, how much boost can a 1.8 handle on stock compression? i'm really starting to get into turboing 1.8.... Cory

 

[ginsu417]

I cannot answer that - anyone with a custom turbo setup will know why. What turbo? What engine revision? Who's tuning it? Ambient air temperature? How many miles on the engine? What headgasket? What mods? What intercooler? What's the oil pressure at idle? Which throttle body, Mitsu or Mikuni? Which injectors? What ratio FPR? What size intake piping?

If you're asking how many PSi you can run on a completely stock engine with no fuel mods, the short answer is zero. A stock bottom end with all supporting mods (exhaust, intake, fuel) and proper tuning will take 5-7 reliably. After that the ring lands start to crack. Not trying to be a dick, just that some people think they can just bolt a turbo up to thier stock block and start making double the factory horsepower. Not the case.

 

[ginsu417]

In case anyone's wondering, the stock rods should be good over 400whp. They're not as thick as the 6-bolt 4G63 rods, but far thicker than the 7-bolt 4G63 rods. The pistons, on the other hand, leave something to be desired.

 

[1.8laser90]

is there any place i can get a better headgasket that will with stand boost ? right now my block is stock but my head has bin replaced and new seals and all that but my head is decked and has higher compression... so i prolly wouldn't be able to boost 5-7 safely ?

 

[ginsu417]

Sure you will. Run high octane, use conservative ignition timing, tune the car right with a wideband (or shoot for .92 o2 voltage if you absolutely have to use a stock sensor), and you should be fine.

Cometic will make you a custom headgasket if you want. But it won't be cheap. You won't have to worry about blowing the regular head gaskets if you run a decent composite gasket (had good luck with felpro) and tune the car well.

 

[ginsu417]

These are previously unreleased details, but I've increased the compression on my car above the stock 9:1 (it's somewhere around 9.3:1 right now), and tuned it out to run at 20psi.

What you may have heard about high compression and high boost is not really all people make it out to be. High compression engines with forced induction just require more precise tuning and conservative fuel and timing. There is a guy locally who's running 10.5:1 compression and a huge turbo on his 2G and he's in the 11s.

 

[compression]

the max i pushed was 7 psi with jus 450cc injectors and thats it

 

[speedy13]

I gotta give you guys props man,thats great what you guys are doin' with the 1.8,i always thought the 1.8 had even less hope then us nters...hey how bout some numbers on these puppies?0-60,1/4 mile,hp,tq?keep up the good work

 

[compression]

i have never dynoed it or ran it at the track or anything so i wouldnt know but id love to tell you guys when i do kinda curious myself

brian

 

[1stGenTuner]

one thing i'd like to know is if he can run that turbo on his 1.8 without mod's like he said would it be possible for me to run my friend's stock subaru turbo? it puts out 8lbs. of boost and i have a custom ported intake manifold, i'm getting a new higher flow fuel pump because my factory one went bad, and some other small additions but nothing internal. would i fry my rings? i dont plan on running the full 8lbs. maybe like 5 or 6. this is just temporary until i get enough for my 4g63t

 

[91lizard]

well it seems that all of us 1.8'ers seem to have all the same idea...but, what all has to be done i mean top to bottom i would much rather learn from someone elses mistakes than my own.......
questions like...
does it have to be bored?
do you need premium rings?
i want my motor to be able to handle at least 10 to 15 psi.....

 

[1.8laser90]

ginsu,
i'm getting all my stuff right now for turbo, i have the colt/mirage turbo manifold... i am also able to get the turbo to go with it but is it worth spending money for it, its in excelent shape and has low miles, will it bolt on with no probs with manifold?? and does that turbo require coolant lines to be ran to it ? if so wheres the best places to tap in at ?.. Cory

 

[ginsu417]

The turbo that came with that car is the textbook definition of crap. Slow spool, high restriction, low horsepower potential, and bad reliability. While it may bolt to the manifold, but it still won't clear the balance shaft housing on the block, so you still need an adapter plate that moves the turbo further away from the block. And if you're going to make an adapter plate, you may as well make one that bolts up to a 4-bolt flange so you can use a larger turbo. Small 16G would be a good size.

Some turbos require cooling lines (Mitsubishi turbos all have them). You can splice the cooling lines for the turbo off your heater hoses, FAIV lines, or you can Tee off one of the senders in the waterneck and weld a bung into the front water pipe like the 4G63 has.

Personally, I prefer removing the coolant lines running to the throttle body or heater and running braided steel line to the turbo from thier taps. Here in Hawaii, the temperatures are high enough year-round where those lines aren't necessary. If you live somewhere cold and can't disconnect the FIAV's cooling lines without having running problems, the next best thing is to just tee into the FIAV lines or heater hoses rather than disconnecting them all together.

 

[1.8laser90]

ya, i think ill prolly end up getting a 14b turbo, that turbo is pretty small and id have to worry about gaskets and stuff for it which i haven't bin able to find... i got a price for some JE pistons to be made they told me $650.00 and they could get them made within 3 weeks, thats with the compression i want and bore and $80.00 for rings.. i am not able to spend the money right now but my question is how long can the stock pistons really hold boost ? running on maybe 6psi, 200 compression across the board, high octane gas, side mount incooler and piping, with stock 2.0T injectors, and a 2.5 in catback for suporting mods ?? my engine has 115k on it and runs really strong considering it has had a top end rebiuld, the block hasn't bin touched yet..

 

[ginsu417]

Everyone always wants to know, "how many PSi the engine will take". I've told people in the past 5-7 psi because it's so little, most people will have a hard time blowing up even a high compression honda engine on such little boost.

The REAL answer to this question is zero. Because if that figure is really going to be the deciding factor on what you set your boost pressure at, you're in for a new motor or two. Efficiency, temperature, engine condition (not milage), and tuning all are key factors is making this "magic number" determination, which isn't really useful to a group of people who are not on standardized parts. 18psi on a 9B is not the same as 18psi on a GT35. And it's not always "the bigger the turbo the less pressure you can run". I've seen cars that can run reliably at 18psi on a 16G but knock like crazy at 18psi on a 14B. So the "how many PSi" question is pretty much asking for a BS answer because the pressure in the intake manifold doesn't really tell you how much airflow the engine is seeing. But ask, and ye shall receive.

Unlike the mysterious and often well overused "PSi", however, horsepower IS in direct correlation with engine stress. So if you're asking how many horsepower the bottom end will handle with no modifications, the answer is - with excellent tuning, somewhere around 160. And that's a cold hard figure that you can actually do something with.

 

[1.8laser90]

i understand... do think thats a good price for the pistons ?

 

[Raph]

The manifold that bolts up to the 4G37 is the turbo colt manifold.

the colt was avaible here as 1,8 gti Turbo(1990 to abgout 1995 )..fast little pocket rockets.. the 2005 colt has a 1,5l 200hp turbo! w00t (the smaller colts from 96 to 2004 had puny slow motors ,at least there bringing it back)

 

[ginsu417]

$650 sounds about right for a custom set of pistons for that motor.