14b installed, but doest feel that strong.

I just got done with the 14b install, but I was not impressed (some thing must be wrong). The whole project went very smoothly took about 5 hours or so. After it was all done and took it out for a test drive, the car didnt seem to pull that hard. It takes so long for my boost to increase and slowly gets to the boost that it is set at. The boost does not shoot up to the boost I want like the T25 us to. Im really disapointed, but I think I know what the problem is. I think it could be the waste gate not being closed all the way. Does anyone have any suggestions why it take so long.

I took it out for a good put tonight and found out that I hardly get any boost in 1st and 2nd gear. But in 3rd it pulls really hard. Does anyone have any suggestions?

Boost leak test? How much boost are you running?

Its quite common on old 14Bs for the flapper arm to fall down from heat and gravity, causing the flapper to not cover the WG hole all the way. Its also possible that the preload on the WG is not set properly.

I'm going to describe the preload thing for what is probably the first time on this site, someone might as well add it to the faq.

The internal WG flapper should have some preload on it to hold it shut. This decreases lag and boost threshold. Not enough preload, more lag. Too much preload, more boost creep. Even new turbos right out of the box commonly have an improper preload setting, so it pays to double check. You can check and adjust with the turbo on or off the car.

When preload is set properly, you have to pull the actuator rod a bit to get it over the pin on the flapper arm. For a new turbo, remove the actuator rod to test it. If it slides on easily, its too loose. If you really have to pull like hell, probably too tight. MY preference is to pull slightly on the rod and look through the hole. I like the pin to be to the right by about 1/4 of the width of the hole. Maybe half if I plan to run high boost. That gives you an idea of how much you want to be stretching it over. Again, its just to ensure that there is always some of that spring pressure holding it tightly closed.

To adjust the preload you have several options. The most common are bending the bracket, or adding washers between the actuator and comp housing. I like to just bend the braket, its faster and more precise. Use a large pair of channel locks, they work best. But a BFH used strategically can get the job done as well. Move the actuator away from the turbine housing to increase preload, or towards it for less preload.



Back to the flapper not covering the hole problem... You really should remove the turbine housing to check this (can be done without removing the rest of the turbo ;) ). If the flapper is not aligned with the hole, odds are it has slipped in the direction of the flapper arm (towards the front of the car, gravity pulls it that way). Bust out the BFH again and beat it back into place carefully. I can usually tell if its bad just by looking at how far the flapper arm is from the turbine housing, but its hard to convey that over the internet, so I recomend pulling the housing to check.

Also, massive cracks where once side is higher or lower than the other can prevent the WG flapper from sealing. There are 3-4 "normal" cracks that all small mitsu turbos develop that wont have a significant impact on spool, so dont panic just because there are cracks. Just be wary of the ones that have really shifted the seat around preventing the flapper from closing. ;)

Thanks for all your help. And yes I did check of boost leaks today. Fund two leaks that were very miner, so I fixed the leaks. I'll look at the actuator and preload stuff now. Thanks Kevin for the good write up on preload and stuff.

How much boost will the turbo hold in 1st and 2nd? Where does it max out at in third? Unfourtunatly, your turbo will never shoot up as well as the t-25, you are flowing about 100cfm's more air (I think the t-25 did either 290 or 320...something around there) so boost will take longer to come on. Only things I miss from my t-25 was the low end torque and how damn fast that thing spooled.

In 1st and 2nd it will hold around 5 psi or so. But twards the end of 2nd the boost will start to kick in really good. And in 3rd... Thats a different story its like a monster, I have trouble keeping my car in my own lane (exagreating a little). I have the boost set at 14-15. So I guess everything is fine then. I though it would spool pritty fast like the T25 but I guess it doesnt.

14b should hit 25 psi by 3000 rpm in any gear. MAybe 3500 at worst in first gear. Its a very small turbo.

Kevin YOU ARE THE BEST!!! You were right it was the preload on the actuator. Now my car feels so much stronger and it spools really fast! I cant belive the difference, I'm just so overwhelmed and happy at the same time. If I'm this happy with a 14b I wonder what a bigger turbo feels like? LOL

I'm sold... I'm turboing my RS. lol

So ragin you wanna race me now ;), when you wanna meet up? Im about to graduate and gonna have a lot of time to do whatever when im not working.

I'll race your ass any day, I just have to shoot your tires out before we race. lol

But about meeting up, I'm just hella busy right now with school (getting ready to graduate) and some girl problems (thats why I love my eclipse). I will let you know when I'm free. But we should meet half way if were going to do it.

I'm a fuckin hero.

:icon16:

so if your using a big pair of pliers in the previous sentence...then does BFH mean Big Fucking Hammer by any chance or am i just retarded? ;)

so if your using a big pair of pliers in the previous sentence...then does BFH mean Big Fucking Hammer by any chance or am i just retarded? ;)

LOL,

The first time I saw BFH I was like "what the F***?:sly:" Then I thought about it and figured it out, it means Big Fucking Hammer.

how is the spool up compaired to a t25? once you got it set right does it lag noticablely more than the t25? how would a 16g compair?

I have an old school all metal BFH affectionately named "The Punisher." It's older than me, but it never fails to get the job done. :)

how is the spool up compaired to a t25? once you got it set right does it lag noticablely more than the t25? how would a 16g compair?


With the 14b, you can hardly tell the difference in spool time between the T25 but it does spool maby a tad bit slower. I dont know about the 16g, but if its ported and stuff I dont think it would be that different.

I have an old school all metal BFH affectionately named "The Punisher." It's older than me, but it never fails to get the job done. :)

I like that "The Punisher":lol:

I have a 93 turbo talon automatic that I just converted to a 14b and I have the same problem. I espected some lag with the bigger turbo but it is ridiculous. Im definately going to check it out.

Try the washer thing between the actuator and turbin housing to see if its preload. I had to put 3 washers there.

I put three washers like you all said and it worked. The thing pulls like crazy now. I really appreciate the tip I thought my car was going to stay slow and sluggish but now it has some get up. Thanks

The number 3 was an estimate. Its possible to over shim the actuator too, increasing the risk of boost creep. My point is that you should use the method I outlined above to set it to the optimum preload.