21 replies to this topic

[Slater]

I am going to be swapping out my stock 15G soon, but decided to have a little fun first.

I got a good deal on a shiny new 300/70 wastegate actuator (i.e. from a 19T and some 18Ts) and swapped it onto my stock 15G. Let me just say WOW. With the weak stock actuator, boost would fade at WOT and high rpms big time. I have a BSR stage 3 ECU BTW. Anyways, between shifts it would fade from 18psi to 12psi and finally 9psi. With the stronger actuator it holds like a rock at 15psi until redline. It still fades from 18psi, but that is just the 15G running out of breath.

Also, part throttle boost is totally transformed. Boost comes on very smooth and very strong. The car is a complete blast to drive. Best $100 I ever spent.

Edited by Slater, 07 December 2006 - 06:27 PM.

[BlackT5]

Good stuff

[prasamin]

no boost fade on my 19t!

[BlackT5]

no boost fade on my 19t!

There was on mine!

[BtownVolvo]

Hmmm...300/70 on a 13g...


[ponders]

[prasamin]

There was on mine!

well, bent rods usually lead to fading everything.

[EricF]

I had none on my 19T either.. But I don't attribute it to the actuator really.

Though, we did see an improvement (a slight one) on Brendan's wagon after we put a 16T actuator on in place of the stock 15G one.

[larryo108]

Best $100 I ever spent.

Slater. You got a part number and a source you mind sharing. You can PM me. I think my WG is fubared. No better time than now to upgrade.

[prasamin]

Slater. You got a part number and a source you mind sharing. You can PM me. I think my WG is fubared. No better time than now to upgrade.

I believe he bought it from another member here.

[larryo108]

10-4. Thanks Pras. I'll have to look up a part number tonight.

[Slater]

I believe he bought it from another member here.

Correct. Part number according to the "FAQ look here before asking" sticky is:

9471535 - 300/70 wastegate

The nice thing is that the 300/70 acuator is available seperately from Volvo. I am pretty sure that the other ones are not and must be purchased as part of the turbo assembly. I am not 100% sure on that but I know for a fact the 300/70 is available seperately.

I had none on my 19T either.. But I don't attribute it to the actuator really.

Though, we did see an improvement (a slight one) on Brendan's wagon after we put a 16T actuator on in place of the stock 15G one.

Which 16T? Angled or straight? Because the wg on my straight flange 16T was identical to the one on the 15G (wg specs are stamped on the bottom). I wonder if the improvement you saw was just the tired 10 year old 15G actuator being replaced with a new(er) one.

Edited by Slater, 07 December 2006 - 08:12 PM.

[Overboost850]

Glad you are happy with it greg! I still have one on my 16T that has been pulled off for the 19T and I shared the exact same observations you do. AS for part numbers I only have a picture of the back of the wastgate with some random number on it :89-18952 and 8Z1

[Greenchunks]

Maybe its cuz im only running 13 psi, but my car holds perfect boost with no creep to redline, and shows no fade anywhere between shifts or anything. 16T (striaght outlet I think was what the 98's had, right?)

[Overboost850]

Maybe its cuz im only running 13 psi, but my car holds perfect boost with no creep to redline, and shows no fade anywhere between shifts or anything. 16T (striaght outlet I think was what the 98's had, right?)

Correct on both fronts. Lower boost level is easier on the whole system and doesn't create enough stress to realize boost fade(on your particular car on your particular setup, other cars and turbos vary). And yes you have a straight flange 16T.

[Slater]

Maybe its cuz im only running 13 psi, but my car holds perfect boost with no creep to redline, and shows no fade anywhere between shifts or anything. 16T (striaght outlet I think was what the 98's had, right?)

Yeah, if you are just running stock levels (or 13psi in your case) I could see that. It's when you start upping the boost when you start seeing really bad fade (depending on the turbo). Do you have an MBC or EBC?

You mean creep or spikes? These turbos don't really have creep problems, but most spike between shifts at least with ATs.

[Greenchunks]

Yeah, if you are just running stock levels (or 13psi in your case) I could see that. It's when you start upping the boost when you start seeing really bad fade (depending on the turbo). Do you have an MBC or EBC?

You mean creep or spikes? These turbos don't really have creep problems, but most spike between shifts at least with ATs.

I have an MBC. I mean creep. On my 740 sometimes when flooring it, the boost would hit like 14 psi, then it would creep up to like 15.5 or 16 psi before the shift. basically, the MBC wasn't holding the boost contant.
And well then looks like I'll have to hurry up and chip my car, then see how it works out.

[EricF]

Which 16T? Angled or straight? Because the wg on my straight flange 16T was identical to the one on the 15G (wg specs are stamped on the bottom). I wonder if the improvement you saw was just the tired 10 year old 15G actuator being replaced with a new(er) one.

Can't recall the number off the top of my head.. But certainly different than the one on the 15G and the spring pressure by pulling on the actuator rod was noticeably stronger as well.

218/60, is that the 15G? Could only find one actuator in my garage... Been a very long time since I have messed with these silly things. Also been a long time since I could find anything in my garage

Oh well.

[Slater]

Can't recall the number off the top of my head.. But certainly different than the one on the 15G and the spring pressure by pulling on the actuator rod was noticeably stronger as well.

218/60, is that the 15G? Could only find one actuator in my garage... Been a very long time since I have messed with these silly things. Also been a long time since I could find anything in my garage

Oh well.

No, it's lower than that. I want to say 150/something (like 150/40)?

[maiku]

19psi till redline ftw