any comments on me attempting this build? no vtech head to deal with straight DOHC and turbos

 

Never seen a twin turbo B20 set-up in person, but I am sure it has been done before. Everything must be custom of course. I do not seen many mass produced dual turbo manifolds made for the B20 motor.

 

Are you just bored? There's really no good reason to go with a twin turbo setup on an engine that small.

Twin turbos setups are designed for engines that have two (or more) separate cylinder banks. That way, you can use smaller turbos which will spool faster. But if you're looking for big power, you develop your own manifolds and go with a big, single turbo (like what the Supra/Skyline/RX7 guys do). I've also read that even the Porsche 959 with it's exotic two-stage turbo setup runs better on a big single.

But if you still want to do it, as cvcrcr said above, everything's going to be custom. Plus, you'll need to use some really small turbos (a T25 would probably still be oversized) to make it worthwhile. Suzuki used to make a turbo motorcycle in the early 1980s that had a tiny turbo on a 1-liter engine. That's probably the size you'd need.

Otherwise, a normal sized turbo (T25 and up) wouldn't build enough pressure running off just two cylinders without a ton of turbo lag. Once they come up to boost, they'd be forcing a ton of pressure into the cylinders, but not until very close to redline. That being the case, you'll also want to build the block with lower compression to make the internals happy under the amount of boost that you're introducing, since you're basically introducing the equivalent of something like a T4 turbo on your engine.

Also keep in mind that your Honda engine makes all its power very high up in the rev band, so if you're looking for better low-end power, your best bet would be a supercharger.

 

i am looking for power and i dont want to deal with turbo lag turbo tunning and all the stuff required with one turbo to make it perfect to get the boost right. Twin turbos are less messy with tunning than a single turbo, this is the reason i want a twin turbo set up. Dislike the hostility ChristianL

 

Relax. He is only pointing out obvious statements. If we see a new user posting about all sorts of random things all at once, it either means they are trying to raise their post count to sell on the site, or they are trying to spam us, or be a troll. Do not take offense to it. We are a small, tight knit group and we do not want to deal with users making junk posts, spamming, or trolling.

Anyways, tuning will most likely take more time with two turbos seeing as there will be more variables to consider and precautions to take. Even if the tuning takes longer with a single turbo, you will still save money in the long run because with the dual set-up you will need custom everything as well as two of most everything, costing a lot more in the long run.

 

not worried about the price i am mostly looking for a build to fit the goal i am attempting to reach. My bad kinda hate disrespect on forums kinda **** me off sometimes but yeah.

 

Well, if you do in fact go for it, make up a project thread and keep us updated!

 

i have pictures of the car and then a photo shopped picture on my profile and most defiantly will make a profile link. How do i do that lol new on this forum?

 

No disrespect or hostility intended. It's just something I see that comes up periodically, and most people who have the idea for it are doing it for bragging rights, and don't really know what they're getting into, or why it won't work well on a small, inline 4. I've been dealing with small inline-4 engines for 15 years (I'm a Miata guy), so I know what you're trying to accomplish.

Since you're planning to do this to a 2-liter motor, I'd take a good look at a Disco Potato turbo (trust me - do a Google search using those terms). They were developed exclusively for 2-liter motors (the first use was on a 2-liter Nissan Sentra), and put out nice power without a lot of turbo lag. It's a "best of both worlds" kinda thing.

But remember that your Honda develops power up high, so a turbo will only add to the lug-lug-lug-WOW power delivery of a Honda.

If you're looking to minimize turbo lag, I wouldn't go with anything larger than a T28, or a T3 with variable vanes. Or check out supercharger options, which will give you power all across the powerband, especially at the bottom and midrange where you need it.

FWIW, our Miata race car is running a DOHC 1.8 engine with a hot side MP62 supercharger. Without doing much more than rudimentary fueling, we'll probably be at 200+hp to the wheels when we dyno and tune it this Spring (fully tuned should be closer to 300). But the Miata engine has decent mid-range torque, and versions I've driven with a big turbo haven't shown much in the way of turbo lag, and are almost as fast as our supercharged one is currently.

Hope that helps.

 

not big fan on the whole supercharger aspect. always like the turbo view on imports vs supercharged domestic motors were the mid-range power complements the power. ive seen major turbo lag on some large turbo's. not big fan of large turbo's on small cars do the lac of ability to run more then 18-24 pounds or boost. just been looking and not to much twin turbo wise for a honda ill have to ask someone who has the engine i have and ask for technician referals