because i tried installing a washer on the flapper door on one of my old turbos, after removing it from less than 4 months of service and noticing that more than 50% of the material had been deteriorated i decided not to use that method anymore.

as for my success with it, i really do not believe i have a restriction anywhere in the system. even with my hybrid turbo i have no issues with creep but the porting has to be done correctly and often times the spring tension needs to be raised on the actuator to keep the gate from being forced open and bypassing due to the added flow amounts.


you guys can preach what you want and believe what you want but i myself will just give my views on the subject and anyone is free to do what they want since they are their cars.


for the record my engine was rebuilt when i ported the wastegate, it has a TID mod and full 3" free flowing exhaust with no cat and a large street port with ported primaries so i really don't think flow is hindered any...

 

lol all i can say is use something better than a dremal for porting!! or at least use expensive bits!!!! , it takes FOREVER wich a cheap 20 dollar dremel kit from shucks lol

 

The thing is, plenty of other people have ported their wastegate to the edge of the flap and still experienced boost creep. That means that for whatever reason, those turbos were flowing more exhaust gas than yours and the wastegate couldn't keep up. There must've been some reason why your turbo wasn't flowing enough to cause this, like a restriction somewhere or a worn out turbo. If you don't think you had those two problems then how do you explain it?

I'm not questioning your experience; I'm just saying that the body of evidence proves that your experience isn't what should be expected, so you shouldn't claim that the stock flap is sufficient for anything more than very mild mods.

BTW, exactly how much boost were you running?

A tungsten carbide burr in a 1/4" air-powered die grinder makes it too easy.

 

porting straight in as in cylindrical will net a huge amount of boost creep still, you did notice i said to taper the port larger into the runners, even reTed gives this same advice from what i remember when porting the WG.

atm i am running a stage 2 hybrid with the stock flapper and it consistently holds 6psi and the previous turbos i have ported all ran about the same for customers i have done the mods on their cars.

ask anyone who has ridden with me if they think i am having flow restrictions.

 

I'd sport Karack's setup, but it's too loud His car pulls pretty damn hard and continues to pull past redline...can't seem to find any restrictions there. The stock turbo he had he could limit to 5.5-6psi and it's the same for this new one. I see no difference in boost control between his and my BNR stage 3 which has the washer welded on to allow larger wastegate porting.

 

Yeah I did, and I'm pretty sure that's exactly what most people do.

All those mods and get less than stock boost even with a relatively puny wastegate port? And you think that's right?!

I'm sure your cars goes well at 6psi, but if it were me I'd be wondering what the hell's wrong that's causing such low boost.

 

the "sound" is the turbo spool/tiwn scroll at like 2k rpms...it starts to give off a rowdy spool sound until like 3k then it dies off and the turbo will just boost it up all day long.....but if it doesnt effect tiwn scroll looks like ill add it to my list already!

 

Do you really just run 6psi with that setup? I will admit that I have driven properly running stock cars at 6psi that seemed faster than poorly running cars at 10psi!

 

I have decided to enlarge the wastegate and weld on a washer but only to the edge of the raised section and not cutting into the surrounding wall. If the washer fails over time, no biggy, I just loose a few races from not having boost and take the stupid turbo off again. The pieces should shoot out the exhaust like when my shaft broke. (very dramatic)

 

lol i am stock 88T2 and hit 6lbs without a upgraded turbo?(fuel cuts a bitch) but i mean thats low boost? are u doing it on purpose?

 

If I heard wrong from Karack forgive me, but he is currently running about 6 psi and will turn the boost up once he installs the bigger injectors and his standalone to control them. Better to be safe than sorry. Only an idiot would crank up the boost of an upgraded turbo on the stock fuel system.

 

well it will creep up to 7.5psi if i really push it in 4th but every other gear it stays right around 6 with the exception of 1st, i just can't keep an eye on it while trying to shift that quick.

as nick said i run lowest boost i can with this wastegate for the reason i haven't touched the stock fuel system yet and i don't feel like risking the motor until i can install the standalone and put the wideband on it.

 

im milling my waste gate hole out to 28 mm useing a defferent flap. im milling the back of the turbo and makeing a back plate for a screamer pipe to get sum better flow and that sound! ive been haveing some big problems with boost creap but i hope this solves it.