e85 14b

[byebyev8]

I blew the seal on my evo3 so i'm going to be running a 14b until i rebuild it ( few weeks) I want to know if there's anything i should change in my tune because of the 14b blowing so much hot air at high boost. Also should i use the 7cm 34mm ported housing vs the stock 6cm. I'm trying to get it to spike as high as possible.

 

[delta448]

I'd use the larger turbine housing. It might help flow a little more and lessen the exhaust pressure seen at the cylinder. Less charge dilution from exhaust can help fight knock just like "blowing hot air" promotes it.

Was the larger housing ported to relieve creep? That might play against you if you're hoping for a big spike.

The 14b compressor isn't really held back much by the smaller housing, and it spools faster when used in it, but the 7cm housing will take you a small amount further towards peak power with the little 14b compressor. Basically, putting the larger housing on will make your car feel like a 16G car, but without as much power in upper rpms.

 

[byebyev8]

Its THe turbochargers.com evo3 housing. I couldn't get more than 23psi out of the housing with the wastegate shimmed. I know with a stock 6cm housing 25+psi isn't a problem. I have a 3inch o2 housing so that might stop any creep/ spikes. I was just really woundering since the 14b flows max 34lbs and the s16g flows 36lbs max then with the 7cm housing it would almost be equal. Also I've seen people getting 300whp out of 14b's at only 21psi which is about the same as what i see on a 16g.

Since i was only able to get 23psi out of the 16g. If i run the 14b at 26+ it should be about the same performance wise.

 

[brian9397gsx]

ive been reading on here quite a few times that the 14b with the 7cm housing is a very good combination. you sacrifice a few hundred rpm of spool for a little extra on top. plus the extra flow will allow you to max that compressor wheel. actually your 3inch housing will promote creep but at that boost level on a 14b creep will be your friend

 

[byebyev8]

How much boost should i run on a 14b to get the most power out of it? I'm going to be running e85 at the track so i was thinking around 25psi but its a 14b and I've seen max power levels around 22psi.

 

[delta448]

Look for about 32-34 lbs/min of flow, whatever boost level achieves that for your setup. That amount of flow is fairly decent for a 14b, max is usually about 36 lbs/min and at that point the little compressor just makes a lot of heat.

I'm going to use air around 13.2 cubic feet per pound for my example (a little above sea level). So ~480cfm divided by 13.2 is about 36.4 lbs/min max flow. At the same time, I'm going to look at the compressor map and notice that max flow at 65% efficiency is a little less than 450cfm (or about 34lbs/min by my conversion) at a 2.4 PR (about 20psi if atmospheric pressure is 14lbs where I am).

For everyday daily driving with gasoline I would probably aim for a decent 70% efficiency and try to find the boost level around 18-22psi that nets me right around 400cfm (~30lbs/min) of flow.

When you go to the track and use E85, you'll be able to make use of some of that less efficient flow that the little 14b puts out at full tilt. Obviously you'll have to figure out where the limits are, but you can definitely explore the outer points of the compressor map much more easily when efficiency doesn't matter. Max flow on the map is shown at roughly 2.6 PR, or about 22-23psi.

 

[dsm-onster]

Zach, you're always right on with your advice. Only thing is that I think that the 6cm^2 turbine housing really does choke the 14b potential, contrary to what you mentioned in your first post; of which otherwise I completely agree. It's so, so easy to see 34lb/min through the td05h turbine wheel and the 7cm^2 turbine housing. So, like you said, it makes a 14b act like a 16g. All the way to choke, it it flows about the same per psi as a 16g and spools about the same as the 16g. It does fall down up top earler than a 16g. But unless the OP wants more than 34lb/min to work with, it will be exactly liek a 16g. . .

Only thing to add. Heat from compressor inefficiency is so overrated. Any decent intercooler (about 70% efficiency) will negate the effects of a compressor pushed to 65%. The difference between 65% and 75% efficiency with such common intercooler efficiency is about 10*F. Turbo Outlet Temperature Calculator

OP your power output will be the same at the same boost if you use the same turbine housing. You will have the same turbine as the evo3 16g you were running. And As I've already linked, the compressor efficiency has a very minor effect on charge temp. Therefore, being that the charge temp is the same, the boost will be the same and the VE will be the same (same turbine), you're performance will be about the same. . . IF you havn't been pushing the 16g beyond what the 14b compressor can flow (34ish lb/min based on ambient conditions), then it makes you wonder if buying a 16g was really worth it . A 16g can do 23psi just fine. And so can a 14b, especially with a stock long block, that you have.

 

[delta448]

Thanks for the help Matt. I understand what you've said and will concur with you.

I haven't datalogged back to back at the upper right edge of the 14b map with each turbine housing, but the quick spool up of the smaller housing makes the car feel as quick when it actually may not be. Maybe someday I'll turn the wick up a bit and see a bigger difference for myself, 16psi isn't really showing me a huge difference on the old butt dyno.

 

[dsm-onster]

Give that 14b he!! It owes you . . .