I was thinking, What do you think the hp differences between two turbos running around 6-8 psi each vs. 1 turbo running around 11psi be? Think I should try it? haha there is a fuckload of room in the 1.8 engine bay due to the small **** engine haha.

It would be a huge waste of time and money. It's a 4 cylinder, there's not enough room in the combustion chamber for all that air. The idea behind a twin turbo is to have one small turbo and one big turbo so you don't get as much lag. Twin turbos are mainly for v6's and up. You'd end up with more power with a single turbo and you'd spend a whole lot less.

That's what I figured but I was just curious. lol I am almost done with the single turbo build but I was thinking hey why not just throw anotehr on there haha. but that answers my question. thanks :D

What you're talking about is sequential turbo. You have a small turbo, quick spool, feed into a larger turbo, thus reducing some lag.

I have seen some people do a custom twin t25 set up, but in the long run would have achieved more hp, more tq and more appeal with a larger single turbo

your turboing a 1.8? You will achive as much HP as im putting down in my 92 4g63NA stock. goodl uck with the project.

how would adding a turbo to his motor give him the same amount of hp that you have in your N/T?

actually a properly tuned 1.8T can get as much as 230hp. and thats with everything else factory ;)

I smell hate.

Hahaha oh the testiness...


Anyhow i think the 1.8t is an interesting project and... its obviously gonna produce better numbers than the 4t63 nt. If some loosers out there will turbo the 1.6, i think thats where the ridiculousness comes in.

oh theres no hate in here. I just didnt understand the facts of the SOHC producing 230 hp with a turbo on it and actually running reliable. I dont hate on any tuner, weather be a ricer or sleeper build. I say go for it and keep us updated as you go along.

That's what he's doing, and i for one support him. It's a good learning experience.

yea, i am actually interested in how this project turns out. the 1.8 is a good little engine that doesnt get much respect. turboing that little thing will certainly be new and different, and i have never held it against anyone for doing something out of the ordinary.

anyways, im not too familiar with turboing a n/t engine, but as far as i know, the smaller the engine, the more revs you can get. revs are fun! i say turbo that thing, then tune it so you can rev the hell out of that engine. THAT would be a fun car.

It's still gonna be slow :P

Seriously thought going with the twins on this would not be bennifical .

How would you be able to get twins on a single mani? I maybe a newb to the site and dsms, but I have never heard of this before. They say anything is possible bro and Im not 100% doubting you, just asking questions. Please dont look at me like Im being an ****, just the new guy on the block hehe.

also this is why alot of the supra guys go from twin to single, for better performance. At least thats what I think

Supra guys go single because theres more potential in one large single turbo.

The problem is that it takes forever for them to spool up. SO in reality all its good for is dyno pulls. While a twin turbo set up will be able to reach similar power levels and will be in power (boost) sooner it will also lose power or drop off sooner because the housing is maxed out. IE the turbo is to small to move any more air.

The manifold would have to be custom made and it would essentially be two manifolds, each turbo getting two cylinders.

that would never equalize. it's better to run a pipe directly from the turbine outlet on the first turbo to the turbine inlet on the next turbo, then from that outlet to exhaust.

kinda like he did it:
http://www.mitsubishi-forums.com/1994-Mits...item-cid624.htm

OK, but if he does that, it's not considered a "twin-turbo" setup.

Twin turbo consists of two turbos, each being fed by half the cylinders on an engine. OR if there is a Y pipe and the exhaust spilts before the turbos (kinda like the remote mount STS turbos for the corvette's and stuff. Each turbo does half the work, and because of the smaller turbos, they spool faster and you can get the same performance out of it as one larger turbo.

One turbo "feeding" another turbo is a "compound" turbo setup and is primarily used on diesel trucks, like the tractor pull guys. It builds HUGE amounts of boost rapidly and reliably. I am talking like upwards of 50 or 60 psi. Basically, all it does is the first turbo accelerates the exhaust gases to a higher level than what is coming out of the engine, which makes the secondary turbo spool faster. Since, the secondary turbo is getting more pressure than if it was on a single-turbo setup, it produces more boost. Obviously not the best choice for a gas engine because there are very few upgrades (if any) to rods and cranks that could support that much boost without shattering.

all very good points.