evil_elmo

hey dudes

i'm wanting to turbo my B18c and i want to do a custom job, now my question is what is a good size turbo?? do i want a small or big??

i'm scared that if i get a small turbo that it will boosts to early and i won't get any traction when a bigger turbo it will take longer to boost and maybe better for traction

also is the boost the same if i run 6psi on a small turbo than if i run 6psi on a big turbo?

please help me guys

Thanks

DigitalFusion

if u want responses for a post like this u should post what your goals are. Are u goign for full race, just playin around on the streets, whats your budget, etc

evil_elmo

its just for street play and i'm thinking to get a turbo from a junk yard, where i live is all JDM cars, so there is turbos from WRX, EVO, SKYLINES,GTX.............i'm just not sure what one to get

chirish

It all depends on your goals first of all, thats how you'll determine what size turbo to go with.

As far as running 6psi on a small turbo vs. running 6psi on a larger turbo...

Pressure and flow are directly related, so you can't flow more air at the same pressure. However, this is where the efficiency of a turbo comes into play; a small turbo is going to have to spin faster than a larger turbo to produce 6psi, thus causing more friction and producing a hotter charge. On a large turbo, it won't take as much spinning to produce 6psi since its compressor wheel and turbo housing are so large, therefore making the charge cooler and everyone knows cooler air is more dense (packs more air molecules per punch) than hot air...the only downside is it'll take longer for the larger turbo to produce that 6psi.

Take for instance my stock turbo, its a CT26 turbo which isn't very large. It starts to become inefficient at 15psi+...It just starts to flow hot air after that which is not beneficial at all. Yeah you can say you run 17psi on my stock turbo, but it won't net you any power gains vs. 15psi. Then say for instance you slap on the GReddy TD06-20G turbo (most popular kit for the Mr2) and you run 17psi...The turbo is more efficient and will produce a colder charge than my stock turbo, even though its at the same psi.

Ask some more questions and I'll shed some more light, I don't really have anything else to talk about


[Modified by PssshhhMr2, 2:32 PM 6/13/2002]

evil_elmo

thanks PsshhhMr2, my goal is probably a 13sec or lower 1/4mile what do i need to do get there??? at the moment i've done a B18c swap into my EK civic but i want more power, i thought of N/A but its to hard to get the hp and turbo seems easyer, also i love the BOV sound :D

so what is a common turbo to be used on a B serie honda?

CovertFI

pretty much everyone here has a t3/t4 including my self

evil_elmo

is there a car that standard comes with a T3 or T4?

chirish

Would you like to be smog legal? If smog is a concern, the GReddy turbo kit for the B18C is a decent kit that will get you 13 second timeslips.

I don't think any car comes standard with a T3/T4 cause that turbo is a hybrid turbo, it has a T3 exhaust side and a T4 compressor side.

evil_elmo

don't worry about any smog or emission stuff, i'm in a country that we don't need cats :D and every car is straight from Japan

so what car can i find a T3 in? T4 bigger?

CovertFI

that is ******* sweet

evil_elmo

hehehehe New Zealand is a great place to do cars, jap imports are cheap and we don't need to worry about any emission laws cause there is none

CovertFI

i forgot! t4 in big truck or tractor. t3 in a saab

evil_elmo

what year and type or saab? also T3 has external wastegate?

chirish

I don't believe any factory cars besides a Porsche (don't remember exact model) come with ext. WG...I may be wrong, but from what I remember, none do. That certain Porsche has the WG vented into the atomsphere too as I recall Thats dope.

evil_elmo

thanks for your help guys, as you can see i'm a newbie at this stuff

so if i get a T3, what is a recommended wastegate? and whats the price of one?

chirish

A Tial 35mm WG should be sufficient...Depends on how much boost you plan to run. Ext. WG tend to run ~$250 U.S. for a decent one.

CovertFI

if it is a stardard t3 you can just take off the internal wg. i would also recomend the tial. i have a turbonetics and it is ugly and some times spikes. tials are so pretty

chirish

You can't really "take off" the internal WG, but you can weld the flap door shut and then weld an ext. WG flange onto a manifold.

CovertFI

well your exhaust flange will cover the hole up. and just buy a nice exhaust mani with an external wg flange



as you can see the internal wg hole is covered

chirish

Hmm can't really tell what is going on in that picture, but I do believe you...Not many internal WG of turbo's can be blocked off though, at least from what I've seen.

KTeller8

Ben at importparts can get you a Tial for 225

I'd go that route if i was you...

evil_elmo

so what type and year saab i get this turbo from??

do you think if i get a T3 i can just run the internal wastegate?

is there a page that tells me the size of a turbo and what car it comes from??

DigitalFusion

working on that! for now there is a list of cars with facory turbos, but what they come with is another story.. if u want my advice, go with a T3 from a 83-86 (dont get anything older than 83) from a Ford Mustang/Ford TBird/Merkur.

They have nice 60 trim compressors, a .63 A/R comp housing, and a smaller 48 A/R turbine housing. These are the best junkyard turbos I have found to this date, and its the one I am personally going to go with in my setup.

The reason you dont want one from a 79-86 ford/merkur is that the exhaust on them ius all goofy, and will not fit on a standard T3 or T3/T4 manifold.