Tial 46mm wastegate
04-13-2006, 12:34 AM
#16
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Ok so it seems that the Tial spring rate is engineered to overcome a certain amount of exhaust pressure which is obviously not present or not as high of a pressure on a 930 with a short header and free flow exhaust setup. It looks like the spring rates shown on the site that sells the springs is right in line with what everyone is saying here, so the next question is should I order the big .9bar spring or the combo little and big that adds up to .9...?
04-13-2006, 12:09 PM
#17
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There was thread some time ago that Kevin of Alamo chimed in and mentioned the systems with GHL headers were over boosting. Nothing to do with the Tial's, but more to do with the exhaust be restricted from the turbo flange to the wastegate. These systems were overshooting by as much as .2 bar under full load. So if you have a GHL system adjust your wastegate accordingly. The B&B systems do not exhibit this problem. I have a B&B with a Tial 46mm, no interference problems and no overboosting issues.
04-13-2006, 07:32 PM
#18
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I thought that was in reference to the higher flowing turbos. With the K27 HF or S, the wastegate pipe was too small to handle the pressure. It would cause overboosting. The Tial can handle it, but you do need to make sure you have the larger wastegate pipe (for the GHL and maybe the B&B?) for the faster turbos.
Originally Posted by WERK-I
There was thread some time ago that Kevin of Alamo chimed in and mentioned the systems with GHL headers were over boosting. Nothing to do with the Tial's, but more to do with the exhaust be restricted from the turbo flange to the wastegate. These systems were overshooting by as much as .2 bar under full load. So if you have a GHL system adjust your wastegate accordingly. The B&B systems do not exhibit this problem. I have a B&B with a Tial 46mm, no interference problems and no overboosting issues.
04-13-2006, 07:38 PM
#19
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Good point. I believe PorschePhD and/or Kevin mentioned they were not experiencing the issue on the B&B's, since the pipe is slightly larger than GHL's.
Ideally, since the Tials are more compact, the mounting location could be closer to the turbo flange port.
Ideally, since the Tials are more compact, the mounting location could be closer to the turbo flange port.
04-13-2006, 09:37 PM
#20
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That's why I decided to buy the Tial, it's so much more compact that I plan on substantially shortening the pipe it is mounted on. I'm going to stick with Tial's chart and order the .8 and .2 bar spring combo...
Last edited by E-man930; 04-14-2006 at 02:49 AM.
04-17-2006, 07:38 PM
#21
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Thread Starter
Well I got my slightly used Tial in today...
It looks so minature compared to the factory gate.
I should be able to substantially shorten the wastegate pipe on my B&B headers...
I'll post pics of it tonight, I'm giving it a qucik repolish by hand and relapping the two sealing surfaces...
E-man
It looks so minature compared to the factory gate.
I should be able to substantially shorten the wastegate pipe on my B&B headers...
I'll post pics of it tonight, I'm giving it a qucik repolish by hand and relapping the two sealing surfaces...
E-man
04-19-2006, 05:00 PM
#22
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Thread Starter
Ok,
I decided to ditch the tial provided banjo bolts and air fittings.
I broke one of the nipples off with my thumb so they seem too weak to me.
Plus the ID is too small compared to the stailess wastegate line on my car.
I ran by autozone and picked up 2 brass 3/8" .25" ID brass barbs to replace the .175" ID aluminum ones...
I recut the threads using a M10 x 1.0 die and replaced the aluminium crush washers with thicker copper ones. I also ditched the cheesy hardware that screws into the wastegate and replaced with 10.9 1.5" long studs to prevent any future problems that could result in damage to the threads on the body.
On a side note, my wastegate is missing the square valve seat on the bottom so one is on order along with an exit flange.
My question now is how does the tial seal against the valve seat flange?
My guess is the chamfer machined on the valve matches up with the same on the seat. But what is used to seal the seat to the wastegate body? I don't see a gasket mentioned anywhere...
Here are some pics.
E-man
I decided to ditch the tial provided banjo bolts and air fittings.
I broke one of the nipples off with my thumb so they seem too weak to me.
Plus the ID is too small compared to the stailess wastegate line on my car.
I ran by autozone and picked up 2 brass 3/8" .25" ID brass barbs to replace the .175" ID aluminum ones...
I recut the threads using a M10 x 1.0 die and replaced the aluminium crush washers with thicker copper ones. I also ditched the cheesy hardware that screws into the wastegate and replaced with 10.9 1.5" long studs to prevent any future problems that could result in damage to the threads on the body.
On a side note, my wastegate is missing the square valve seat on the bottom so one is on order along with an exit flange.
My question now is how does the tial seal against the valve seat flange?
My guess is the chamfer machined on the valve matches up with the same on the seat. But what is used to seal the seat to the wastegate body? I don't see a gasket mentioned anywhere...
Here are some pics.
E-man
04-19-2006, 06:01 PM
#24
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Thread Starter
Stainless studs are alot softer than grade 10.9 stuff.
I was afraid I would snap them.
These are black epoxy-paint coated so they should hold up well.
E-man
I was afraid I would snap them.
These are black epoxy-paint coated so they should hold up well.
E-man
04-20-2006, 01:32 PM
#27
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Originally Posted by E-man930
Stainless studs are alot softer than grade 10.9 stuff.
I was afraid I would snap them.
These are black epoxy-paint coated so they should hold up well.
E-man
I was afraid I would snap them.
These are black epoxy-paint coated so they should hold up well.
E-man
04-26-2006, 11:56 AM
#30
Drifting
I just got my Tial today...what a gorgeous piece! Mine came with a separate square flange. One side is flate, the other side has a small extension around the circular center. How does this flange fit?