i want to run a T25 from a dsm on my d series. since it has the internal waste gate set so high how do i change that. I'm only going to be runnung it at 5-8lbs for now

 

It's based upon a rod actuator, you can only adjust the length of the rod. That's it.

 

how do i know how far to extend it and should i extend it so the boost is at 5 psi and then use a boost controller to turn it up to 8 psi when i want? thanks

 

will a dsm 14b actuator get the boost down to around 5 psi?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94ta_lt1 &raquo;</TD></TR><TR><TD CLASS="quote">will a dsm 14b actuator get the boost down to around 5 psi?</TD></TR></TABLE>

NOOOOO

my 14B stock wastegate gives me 9 psi all day long
u cant lower it

 

is there no way to lower the boost?

 

you should be able to attach a boost controller to it.

 

You can buy an adjustable wastegate actuator. I actually got mine from Stone Racing (You know, the guys that make turbos that fail 75% of the time)

 

i don't think i can attach a boost controller b/c that only raises the pressure and does not lower it right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94ta_lt1 &raquo;</TD></TR><TR><TD CLASS="quote">i don't think i can attach a boost controller b/c that only raises the pressure and does not lower it right?</TD></TR></TABLE>

Right. Not to be a jerk but search around its been covered alot. You can lengthen/shorten the rod (thread it, instructions are online) and that will allow you to lower the boost. You know how much boost youre running with your boost gauge then you figure out how much to adjust the rod...

Hell... I'm in a good mood today cause of a promotion at work so I've decided to include the instructions. Here ya go.

 

first off... some advice... trade someone that t25 for a 14b or a t3, because it sucks... 8lbs on a t25 feels like 5lbs on a 14b.... ok... next, you cannot switch the wastegate between a 14b and a t25... also, a stock 14b wastegate is 8lbs, so USDM, your boostgauge sucks... and finally, to answer the question, if you want to lower your boost, take your wastegate off and go get a carb spring... let me see if i can find a pic

 

Go down to any auto/hardware store and get a carb spring. Bolt one end to the block and the other end to the wastegate flapper arm on the turbo... The tighter you pull the spring when you bolt it to the block, the more boost you get, the less tighter, the less boost... what makes this good is you can adjust from 0psi to 30psi probably... the only bad thing is that you have to play with it till you get it right, but that's with any boost control device so....

 

thanks everyone...i really appreciate your time and help

 

a stock 14b wastegate is 8lbs, so USDM, your boostgauge sucks... and finally, to answer the question, if you want to lower your boost, take your wastegate off and go get a carb spring... let me see if i can find a pic


ACTUALLY mine is exactly at 9 lbs to with a 16g with a 14b wastegate. The wastegates varry 1-2 PSI. So out boost gauges don't suck that is just what happens. Its the same for the 16g wastegate, it is an 11-12 lb wastegate. Just though I would say that.

 

thanks a lot 93turbo16


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dohcnotec &raquo;</TD></TR><TR><TD CLASS="quote">so USDM, your boostgauge sucks... </TD></TR></TABLE>

if u dont know what u saying, STFU


i got a 14B rebuilded, and i get consistant 9 psi....... wanna be exact??? its .65 on my VAFC, wich is 9.245, depending on temperature, i get only 8.5 when really hot , or 10 psi when nice day

theres MANY DSM people around me with this turbos, and all the 14B's are not the same, for example.. my buddy mike gets 11 psi all day long on a stock dsm
my other friend chris gets 9.5 psi, we can basically say a 14B can be between 8-11 psi

i have had a manual boost gauge on my manifold, my boost gauge, and VAFC reading all telling me the same readings... i know is not a bad guage issue

 

i have one more quick question. do i need a boost controller if i just shorten the rod and run the internal wastegate?

 

The boost controller will not drop the boost pressure, if you want to run right off the wastegate and no more with a shortened arm, then you don't need one. Don't see why you would shorten it, then want to turn it up.

 

i want to run low boost for now untill i get my valves and all redone then i want to turn it up some

 

honda tunning magazine bent their aculator arm and made it shorter to run less boost on their T25, its on their boosted CRX, i believe if u just bend the aculator so its shorter it shoudl run less boost.

 

if you want to be really cool, you can make the actuator adjustable.

and to solve the increased lag, you do this:

go to mcmaster-carr and order a 25 lb/inch spring

once it arrives, cut the actuator can in half, radially around the crimp. be careful not to cut too much of the rubber diaphram.

take the spring out.

put some rtv around the top sealing surface of the diaphram, and put that back into the top half of the actuator can. put the other half over that, and put the whole thing in a vise until the rtv has set.

now make sure that the diaphram is sealed.

with that done, put the whole thing back together using the softer spring you ordered. you're going to have to make some kind of clamp to keep the two halfs of the can together, as you ruined the crimp when you cut it apart.

now put the whole damn thing back on the turbo, and adjust to whatever boost level you want.

the reasoning behind this is that with the stock actuator spring, the only way to get the boost down to 8psi is to have the wastegate be leaking. this kills the spool, which is the main reason to run a t25. with the softer spring inside the actuator, you can get the wastegate back to where it is shut. viola, you now have a fast spooling t25 that makes 7-8psi of boost.

 

Yeah that sounds like the best idea to me...could i even get a diff. spring to run 6 or so psi?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by USDM 4G VTEC &raquo;</TD></TR><TR><TD CLASS="quote">thanks a lot 93turbo16


if u dont know what u saying, STFU


i got a 14B rebuilded, and i get consistant 9 psi....... wanna be exact??? its .65 on my VAFC, wich is 9.245, depending on temperature, i get only 8.5 when really hot , or 10 psi when nice day

theres MANY DSM people around me with this turbos, and all the 14B's are not the same, for example.. my buddy mike gets 11 psi all day long on a stock dsm
my other friend chris gets 9.5 psi, we can basically say a 14B can be between 8-11 psi

i have had a manual boost gauge on my manifold, my boost gauge, and VAFC reading all telling me the same readings... i know is not a bad guage issue

</TD></TR></TABLE>

sorry ladies... didn't mean to step on any toes... anyway, 7 homemade turbos (most 14b/t25 and 1 16g) the 16g was 10-12 psi, and the 14b's were always 8psi... I guess you guys got the good ones just kidding for people who get butt-hurt so easily...

 

on second thought, altitude does change absolute pressure readings, maybe that has something to with differences in wastegate openings... anyways, back to the topic at hand, you have a lot of options for limiting boost... good luck

 

yeah i think i am going to go with changing the spring

 

Is there suppose to be a clip on there(the green circle), my DSM t25 didnt have one. I can just pull it off. Does it need the cir/c clip thing?