GTB Primary Turbo Mod for full 16psi boost

[98GT-Biarch]

I found this YouTube video that most of you have probably seen also: http://www.youtube.com/watch?v=t10LQvwubDA Which shows how you can block off the number 10 hose to the wastegate solenoid and this runs your primary turbo at max boost, from 11 psi up to 16 psi. I tried it out yesterday and it seems to work well.

As far as I know, this wont hurt the engine or turbos much, I believe the turbos are rated at 18psi anyway so 16 is within limits, but is there anything else which could be negatively affected by this mod? Is it ok to leave it like that for everyday driving?

[mazdahard]

whats vod like after doing this?

[Joker]

with my Apexi AVC-r I can achieve the same readings

I imagine VOD is same BUT to someone who really really really likes his TT I dont care about VOD you learn to live with it to the point of not noticing it

[98GT-Biarch]

Increasing the primary boost doesn't affect VOD, but I totally agree with Joker, I think the 'vod' is a feature not a fault, it allows you to drive normally and efficiently using the smaller primary turbo, and when you want the power you let those revs go nuts and BAM the secondary turbo kicks in once its had a cup of tea and a lie down (vod) Its not a race car but its a fkn fast stationwagon. I love overtaking more expensive powerful cars at full noise and watching their faces as I speed past them.

I'm going to make some cool vidz for YouTube cos there isnt many good ones on there yet, I'll post up once they are done.

[Guest Rugged_RS]

Hay i really like this idea... does anyone know if it will cause any future issues, also can i do it to my 94 RS TT Leggy???

[ebg5 NZ]

hm, i got msg this video is no longer avaliable, permanent or just a bug type thing

[Joker]

nope its still there

user is onegreek and his 1/4 mile drag vids are funny

also has useful "disable annoying door bell ding vid"

[98GT-Biarch]

He grabs a helmet at the 1/4 mile start line, puts it on backwards, then proceeds to drag his GTB wagon down the track. His starts were pretty bad, but his third attempt was successful against his mate in a 2000 WRX.

[ReubenH]

Yeah nah guys. That line goes off to the boost control solenoid in the passenger wheel arch, for the primary turbo... You're un-plugging one of it's vac lines... which means what?

I'm guessing it is allowing the primary to free boost.. which means blown turbo in no time, the primary's are already overworked as is.

Maybe in a BH/BE you're safer, cause i've never heard of them having turbo issues. But for the BG/BE's... i do not recommend you do this mod.

[98GT-Biarch]

I'm loving the extra boost in my GTB with this mod!

It compensates for the 16 kw loss due to the detuned engine for low octane fuel (190kw down from 206kw), and I like to believe the engine and turbo are still happy and not overstressed because they are rated for higher power anyway.

Worst case scenario my primary turbo blows and I replace it with a newer bigger one.

[Guest BLST!C]

actually, worst case scenario is that they detuned the engine by lowering the boost pressure alone. And you just raised it again.

[Guest Rugged_RS]

well i tryed it any way, pulled it out and blocked it up... cant say i've noticed any difference???

[GT_Head]

There is a few ways to get 16psi on primary but unplugging something is free.

 98GT-Biarch said:

Its not a race car but its a fkn fast stationwagon. I love overtaking more expensive powerful cars at full noise and watching their faces as I speed past them.

I don't know... when I change everything over/ take everything else for the track my car definetly more resembles a race car ...... hahaha

[Guest]

 98GT-Biarch said:

I'm loving the extra boost in my GTB with this mod!

It compensates for the 16 kw loss due to the detuned engine for low octane fuel (190kw down from 206kw), and I like to believe the engine and turbo are still happy and not overstressed because they are rated for higher power anyway.

snip

I get this and yes, I've tried it on the BG5B year ago, which blew the second primary turbo, I replaced the primary with a VF26 and did the same mod and it holds okay. VOD is still there, the mod, never changed that.. But I have to say, I brought my partner and v2 impreza single turbo and hitting 15-16psi with this plug up mod for the TT is no where near the same as 16psi in the single turbo. WAY different.

Yep will agree the GTB is a road car not rally car. I like my GTB with all it hassles and limited this and that.. I decide to change it .. personally I think if you want real power, convert it, or buy a controller to deal with it, as stock .. or just bear it., and do the mini mods until you either get sick of it or sell it.

[subieboy]

Hey Oldy but goodie...

Hope you have a good supply of good primary turbo's...

[RAYDEO]

 Rugged_RS said:

Hay i really like this idea... does anyone know if it will cause any future issues, also can i do it to my 94 RS TT Leggy???

as with any car, if you wind up the boost you could have issues...

the manufacturer set the boost for a reason...

although having said that my gtb was boosting 17psi for a quite a while before i knew found out that was a massive amount of boost for a non sti and still drives fine (even with the cel coming on all the time - damn knock sensor)

when i say "still drives fine" i suspect it was pretty shot but has since been sold so i dont care lol

[Guest]

 subieboy said:

Hey Oldy but goodie...

Hope you have a good supply of good primary turbo's...

AH nope I am converting.. replaced the primary twice is enough for me.. singles on.. when I am richer. I have a T04 detained for my GTB

[Guest]

 RAYDEO']

[quote name='Rugged_RS said:

Hay i really like this idea... does anyone know if it will cause any future issues, also can i do it to my 94 RS TT Leggy???

/quote]

as with any car, if you wind up the boost you could have issues...

the manufacturer set the boost for a reason...

although having said that my gtb was boosting 17psi for a quite a while before i knew found out that was a massive amount of boost for a non sti and still drives fine (even with the cel coming on all the time - damn knock sensor)

when i say "still drives fine" i suspect it was pretty shot but has since been sold so i dont care lol

my old gtt run 18 psi for 2 years and i raped it every day still went well when i sold it