Bc 272

[1gLover]

What hp increase can i see from the bc 272 on a stock head with a big16g ?

 

[1gLover]

Anyone????? 15,20,25 ????

 

[JusMX141]

I wouldn't choose 272's with a 16G.

Cams may or may not produce more power on your application....but it WILL move the powerband to a different RPM range.

 

[1gLover]

So what cams would be a good for a big16g and stock head 264's?

 

[GalantGreg]

I'm adding 272's to my 1g. Can't hurt.

 

[JusMX141]

I'm adding 272's to my 1g. Can't hurt.

Actually, yes it can hurt.

I would say no more than 264's would be good for a 16G. Plenty of guys have made 300+whp on stock cams with a 16G, too....just something to consider.

Everytime you step up in cam size you're pushing your powerband further and further away from the useable range of a 16G. With 272's, the power won't feel so "sudden"....the turbo will become laggier, and you may even need a quick downshift to bring the power on if you're on the street instead of just pushing down on the accelerator like you can with the stock cams.

With 272 cams the car will feel faster near redline, but slower on the street. Unless you're driving around wide open everywhere like a madman, you'd never feel the power they'd give you. Big cams are intended for big turbos and dragstrips.

If your car's an auto, I'd go as far as to say 272's are out of the question unless you have a converter with a higher stall speed.

 

[booostedGSX]

I have BC 272s in my car. I do have an Evo III too. Like Jus said, it does move the powerband up, and it may make the 16G seem laggier. But, it does seem to hit alot harder later in the RPM range. This doesn't bother me too much, but I am going to a larger turbo relatively soon, as well as a speed density setup.

 

[JusMX141]

272's are great for something like a 50-trim Garrett / 20G Mitsu, or bigger. These are turbos that begin to make power at 4k and pull to redline, so you buy your cams to suit.

A 16G can reach full boost as low as 3200rpms on some applications and tend to sign off a little early in comparison to the 50-trim or 20G....so why would you want cams that take away torque to give you revs?


If a lumpy idle is all you're after, get an adjustable cam gear for your exhaust cam and advance it 5-6*.

...but I am going to a larger turbo relatively soon, as well as a speed density setup.

Awesome! How big are you going, or do you want to stay streetable?

 

[1gLover]

What about a 18g will the 272's be good or 264's

 

[booostedGSX]

Jus, I plan on staying streetable for now. I'm between turbo choices. Either a Bullseye V-Trim, PTE 50 Trim or a 20G. It's all about the money for me... plus I gotta spring for the parts to switch over to speed density using DsMAP.

 

[booostedGSX]

Also, to OP, an 18G would work fairly well with 272s. From what I've heard (never experienced) 18Gs spool a good bit later than 16Gs (even Evos). That being said, the later spool of the 18G would be a good compliment to the later powerband of the 272s.

 

[JusMX141]

Jus, I plan on staying streetable for now. I'm between turbo choices. Either a Bullseye V-Trim, PTE 50 Trim or a 20G. It's all about the money for me... plus I gotta spring for the parts to switch over to speed density using DsMAP.

Of the above choices, I'd go for the 20G. They have proven MHI reliability on their side, and have tons of different turbine choices depending on where you want your powerband. My buddy ran a 20G a couple years back with a TD05H turbine on his full-weight 2G TSi. Full spool (20psi) was at 3800rpms, and the car pulled hard to redline with BC0101 (272/272) cams. Trading the TD05H turbine for a TD06/TD06SL2 or TD06H turbine would add some lag but flow much more on top end if you're planning on running lots of boost.

Do some research on the V-Trim before you decide....there are guys that see more airflow with a 16G. Check out these posts:

http://www.dsmtuners.com/forums/turbo-system-tech/312962-to4b-v-trim-users.html#post151653795
http://www.dsmtuners.com/forums/turbo-system-tech/312962-to4b-v-trim-users.html#post151655439

The 50-trim is a good choice as well, but I'm fed up with PTE's reliability lately. There are tons of other 50-trims on the market though!

 

[MY1GDSM]

Actually, yes it can hurt.

I would say no more than 264's would be good for a 16G. Plenty of guys have made 300+whp on stock cams with a 16G, too....just something to consider.

If your car's an auto, I'd go as far as to say 272's are out of the question unless you have a converter with a higher stall speed.

Thats Funny A local tunner here in the NW just ran a 10.8 with a Auto,e316g 272's, and Maf Pro

 

[JusMX141]

Interesting. He must be some type of magician.

 

[MY1GDSM]

Something like that.... O ya that was with no Intercooler too...
Here's a vid of it...

YouTube - Talon AWD TSI 10.8@125 EVOIII 16G Automatic E85

 

[JusMX141]

No need for the vid link; I've been following the thread http://www.dsmtuners.com/forums/dra...o-iii-16g-stock-automatic-no-intercooler.html (still curious why the car has no blow off valve). I'm always excited to see someone reach new heights among the DSM community. I was at the track the night Curt Brown's 1G ran a 10.33 with a good ol' Evo III 16G....that was a great night.

But I am curious.....are you implying that all of us should be running 272's, 16G's, and no intercooler in our street cars? Bear in mind the O.P. of this thread probably isn't planning on running 30+psi which would prompt the use of more aggressive cams with a 16G.

 

[50trimmed1g]

272's will allow you to start making power just about where the 16g is tapering off power. I'd go with 264's or maybe a 264/272 combo. Just my 2 cents.

 

[1gLover]

O ok i am just looking to make so good numbers maybe 3++ or 3 flat. I am on evo 550's walbro 255,big16g and other little stuff . Looking to buy dsmlink this weekend, so 264/272 will be a good combination for a big 16g or just 264/264 maybe in the future i will be upgrading to 18g if i cant make what i am looking for.

 

[FonZ454]

Do you ever plan on putting on a bigger turbo?

I put 272's on my car because I have a bigger turbo waiting to go on, and didn't want to replace the cams again (did a timing belt at the same time, was due).

272s+ big 16g is a decent combo, but not ideal. My car trapped 120mph with them, but I'm sure the stock cams would of been just as close too.

My most recent dyno graphs have power still being produced at at 7000rpm's (shut down rgitht at 7k, looks like peak power too), where as stock cammed, power was going downhill around 6000RPMs. The setup had a few other changes that could cause that, but cams are sure one of the major changes. All on a big16g.

Oh, an they sound cool at idle

 

[jrohner]

Look at my torque on my dynojet dyno chart posted in my profile! Probably 28psi or so psi falling to 22-23psi. I run BC272's with my 16g. I love them and would never think to go smaller, but maybe bigger. I lost no low end, spoolup rpm is identical to stock cams (2700 or so). I actually seemed to gain everywhere. I think I gained around 2.5 lbs/min of airflow at about 1psi LESS boost (19psi vs 20psi when I logged it on the street before and after).

My dyno with stock cams in fwd mode (tranny issue) was 340hp on a dyno dynamics (reads really low) at 24psi; after cams, ported stock exhaust manifold, and intercooler i did 370 in awd mode on the same dyno at 22.5-23psi. Peak torque was at about the same rpm, and peak hp was actually at a slightly LOWER rpm.

 

[dfootedsm]

So my bc272s although are not the DSM'ers choice would be a better than a set of comp 101100's @JusMX141 for my 20g setup?

 

[JusMX141]

Sure- just make sure you degree them if you want to extract the most power; or schedule some dyno time with adjustable cam gears installed.

 

[dfootedsm]

sounds good. the hunt contines any opionions on the adjustable cam gears? are OBX any good? @JusMX141 ?