syclone#2659
Donating Member
i just purchased the 20 lb spring for the ATR external wg, she said that they come with 18 lb springs already.....now will the 20 lb spring hold my boost steady, because i was getting boost creep with the 18
ATR 20lb spring for wg
- Thread starter syclone#2659
- Start date
Hmm, having kind of the same problem on my friend's truck. We took the wastegate off and pressurized it with an air compressor. It did open right around 18psi. However the base boost we're getting is 10psi!! What base psi are you getting with the 18psi spring?
Also I've read that it's tricky to get that wastegate back together, are you going to do it yourself? I'd like to know what results you get with the 20 spring.
Also I've read that it's tricky to get that wastegate back together, are you going to do it yourself? I'd like to know what results you get with the 20 spring.
myclone
Donating Member
Wes said:
FWIW.. Ive learned from ppl on here and my own experience tinkering with my ext WG that the spring rating isnt gonna always give you the same base boost. As in a 18lb spring might give you 10 psi on one build up vs getting 15+ on another.
Seems that exh back pressure has a lot to do with it if I understand it right. The more back pressure you have (say stock manifolds/xover vs headers/dump) the more force thre is trying to push the WG open along with the psi from the intake that is pushing against the diaphram inside the WG actuator.
On my external it came with a 9lb spring. I could get 9psi base boost but could only make a max of 20psi due to the back pressure in the exhaust blowing the WG open according to the ppl I talked to. I switched to a 14lb (might be 15. Id hafta check) spring but only got 13psi base boost. This was due to the back pressure in the manifolds/exh housing/etc getting too high at the upper RPM range and forcing the WG open a couple of psi early. Least thats the way it was splained to me or at least the way I understood it.
IMO if you only get say 14psi on a 18psi spring (base boost) then you may actually have to run a even heavier spring to achieve that 18psi with a particular combos exh restriction.
Reduce or take the exhaust restriction(s) out with that same "higher" spring and sweeeet daddy mommy britches!!! Look the hell out cause you'll end up with more boost than you know what to do with.
Correct me if Im wrong but thats the way I hear'ed it. :wink:
syclone#2659
Donating Member
id ditch it if somone gave me one for free...but i dont see that hapening 
, but for the ajustments i am using the atr boost controller(the knob) in the engine compartment. some times my boost will hold at 16 where i set it. and then sometimes it creeps up. so i figured if the 18 lb will hold it where i want it most of the time, it should hold it alot better with the 20?
, but for the ajustments i am using the atr boost controller(the knob) in the engine compartment. some times my boost will hold at 16 where i set it. and then sometimes it creeps up. so i figured if the 18 lb will hold it where i want it most of the time, it should hold it alot better with the 20?have you ported the wg hole coming out of the turbo ? I had boost creep until I did that now I have rock solid boost with the atr wg on a te44 The base boost is going to be about 2 psi below spring rate with the atr gate you have to dick with it alot to get it right.. nothing a little beer... well alot of beer won't fix :drinking:
id ditch it if somone gave me one for free...but i dont see that hapening
Money's worth it to save a motor IMO.
but for the ajustments i am using the atr boost controller(the knob) in the engine compartment. some times my boost will hold at 16 where i set it. and then sometimes it creeps up. so i figured if the 18 lb will hold it where i want it most of the time, it should hold it alot better with the 20?
A spring isn't going to help a POS gate that isn't working correctly.
If everything is working correctly other than the wastegate, you need to do one of these:
1- replace the ATR gate with a real one
2- have it fixed up by Limit Engineering
Money's worth it to save a motor IMO.
but for the ajustments i am using the atr boost controller(the knob) in the engine compartment. some times my boost will hold at 16 where i set it. and then sometimes it creeps up. so i figured if the 18 lb will hold it where i want it most of the time, it should hold it alot better with the 20?
A spring isn't going to help a POS gate that isn't working correctly.
If everything is working correctly other than the wastegate, you need to do one of these:
1- replace the ATR gate with a real one
2- have it fixed up by Limit Engineering
syclone#2659
Donating Member
i know i should get a better one. but im broker than broke, im basically screwed. truck sucked me dry with the first rebuild, it needed a rebuild because the two inner main berring were spun. i hear ya on getting a new one , if i did put a crowbar in my wallet, what kind should i get that would work with the pte 54 and atr headers?. but first how do i port the wastegate like you said to get more solid base boost
use a diegrinder on the wastegate outlet of the turbo you can inlarge it to about 1 1/4" to 1 1/2" that alows the wastegate to vent more exaust and you souldnt get boost creep as bad. the one on my turbo was only 3/4" and I was getting creep real bad now it is solid. also going up on spring psi will not make boost solid only make base boost higher to start with with an 18# spring you should be able to get about 15 to 16 psi base and be able to adjust it to about 21 to 22 with the bleeder valve