how to lower boost
 

Hey guys,

killer site.

i looked in FAQ and the very 'how to lower boost' question i had, the link is dead.

so, here is what i got:

a 97 dohc saturn using the mitsu T25. i only want 8psi because i'm not interested in using controllers and whatnot at this time. i'm going to use the BEGI rrfpr with around 300cc/min injectors.

because the stock mitsu's wastegate pays off around 10-12psi, that is obviously much more than i want so what have you guys using the T25 used to control pressure down to around 7-8psi?

what wastegates from other applications have that low of a boost setting that might either swap right in OR be able to be tweaked slightly?

i feel like i came to the right place for answers. thanks!
kurt

Re: how to lower boost
 

extend the arm. that'll be the only way to lower boost. as you cannot lower boost even with a boost controller

Re: how to lower boost
 

are mitsu t25 wastegate arms adjustable?...

Re: how to lower boost
 

not the one I got.

Re: how to lower boost
 

the stock dsm WG is set at ~8psi.

Re: how to lower boost
 

Remeber where you are.....

At HMT everything is adjustable......

Chop the the wastegate arm in half and thread both sides. Use a long nut to lengthen the arm and adjust from there, you shouldnt need too much.

Re: how to lower boost
 

yea or heck even bend the bracket a little. you're trying to open the wastegate flapper a little, or relieve some tension on the actuator arm. this is about all you can do to lower the boost, without switching the wastegate, i believe. i don't know about the saturns in perticular, but if it was me i'd just take the boost source as early as possible (before the intercooler) and leave the wastegate the way it is. you're gonna want that power sooner or later anyways. good luck.

Re: how to lower boost
 

another cheap / unreliable way is to remove the stock wastegate and use a spring say 8 psi and attatch that to the flapper ... its dodgy as hell but its another way around it .. best thing just run external or shorten the actuator with a long bolt and thread

Re: how to lower boost
 

drill a hole in your intake pipe :1 then jb weld it when you want more boost

Re: how to lower boost
 

lol awesome post

Re: how to lower boost
 

ZEXCOOL,

are you sure the stock dsm wastegate is set to ~8psi?

i thought it was at 10-12psi? what year would have the gate at 8psi? I could save myself a lot of trouble and just use the one that came with the turbo if that is the case.

I guess what i'm saying is does it matter from what year a t25 turbo one has as to what psi the wastegate is set at?

Re: how to lower boost
 

I have the 14b and it runs 8 with spikes up to 12psi. just put it on and don’t worry about it. just make sure you have it tuned correctly.

Re: how to lower boost
 

spike to 12psi?
50% spike?
any reason?

Re: how to lower boost
 

don’t really know. only did it once, it read .85 bar. now sometimes it goes up to .76 bar which is ~11psi. I really don’t know, I think its just my boost gauge but im not sure. I have one of those blitz dual turbo timer boost gauge. ill get it retuned sometime this week to see what im really running.

Re: how to lower boost
 

ahh ok. i'm planning on running a t25 on my setup, so i was just wondering if thats just what they do. i'll be using my v-afc as a boost gauge :l

Re: how to lower boost
 

The wastegates are 8.5psi. Stock DSM had an electronic solenoid that when the car was at operating temps they run 10-11psi.

Re: how to lower boost
 

solid info guys! :y