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Carrera RSR
Joined: 08 Jan 2010
Posts: 2312
Location: Somerset, UK
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 Posted: Sat Jun 19, 2010 6:08 am Post subject: Boost controller overboosting at minimum setting |
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Fitted a Turbosmart Boost Tee into the wastegate control line tonight and a quick drive to see whats happening. I didn't move the control knob from minimum so expected the boost to max out the usual ROW 0.7bar. With surprise and horror its maxing out at 1.0bar!! Came off the gas. Tried this in all gears and speeds, as soon as it hit 1.0bar I backed off. The TIM gauge I am using only goes to 1.0bar. The needle didn't go past the 1.0 on the gauge and not sure it can (i might hook it up to my high pressure track pump and see!). I know a boost controller can cause an initial spike prior to the wastegate opening and stabilising the boost back to 0.7bar but it never dipped below 1.0bar unless I came off full throttle. When driving at any boost under 0.8bar the car did feel better, stronger and lively. Just can't leave it on without any intercooling at this boost level.
Anyone with experience or advice.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat Jun 19, 2010 6:52 am Post subject: |
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Can't you get different springs for that device? Sounds like a softer spring for the MBC is required...
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sat Jun 19, 2010 6:58 am Post subject: |
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As shipped, the diminiutive air passages in the Boost T do not flow enough air to quickly fill up our monster 930 wastegate diaphragms.
One of the two fittings conceals a ball and spring. Remove the ball and spring, and see if your problem improves.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Carrera RSR
Joined: 08 Jan 2010
Posts: 2312
Location: Somerset, UK
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| Posted: Sat Jun 19, 2010 7:01 am Post subject: |
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Removed the spring & ball bearing on the second run out tonight. Just the same in hitting 1.0 bar. However I did drive it further and faster without than on the first run with. Could the bore of the fitting charge tube side be too small and restrict pressure to the wastegate?
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sat Jun 19, 2010 7:08 am Post subject: |
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I run the same unit and it works fine, although it does spike just a bit. How did you splice it into your control line?
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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Carrera RSR
Joined: 08 Jan 2010
Posts: 2312
Location: Somerset, UK
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| Posted: Sat Jun 19, 2010 7:18 am Post subject: |
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The cardinal sin of cutting the rubber hose between the charge tube and control line
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Grenadiers
Joined: 20 Feb 2007
Posts: 3222
Location: Nelson, WI & Prescott, AZ
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| Posted: Sat Jun 19, 2010 7:37 am Post subject: |
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Ooops, you can take n/a fuel line from engine compartment, cut it, put in MBC, and use fuel filter fittings to fit onto the stock line without cutting it. I don't know the details, it was a year ago, but it worked for me. I needed the extra length for the CGT TMIC I put in.
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'83 944 Track car.
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Carrera RSR
Joined: 08 Jan 2010
Posts: 2312
Location: Somerset, UK
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| Posted: Sat Jun 19, 2010 7:43 am Post subject: |
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| Grenadiers wrote: | | Ooops, you can take n/a fuel line from engine compartment, cut it, put in MBC, and use fuel filter fittings to fit onto the stock line without cutting it. I don't know the details, it was a year ago, but it worked for me. I needed the extra length for the CGT TMIC I put in. |
I went to a fuel line specialist who had no fittings that worked with the stock joint. He had everything but what I needed. I debated with myself all day today in whether to cut or not. In the end curiosity got the better of me. Lets hope curiosity doesn't kill the car!!
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sat Jun 19, 2010 7:51 am Post subject: |
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Meh, that's no sin, a hose guy could have the control line as good as new in no time.
How did you adapt the tiny boost tee fittings to the stock line?
FWIW, here's my boost tee plumbing (clicky):
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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morghen
Joined: 21 Jan 2005
Posts: 9102
Location: Romania
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| Posted: Sat Jun 19, 2010 8:19 am Post subject: |
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| Rasta Monsta wrote: | FWIW, here's my boost tee plumbing (clicky):
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how is that a ''tee''?
thats an inline flow restrictor.
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sat Jun 19, 2010 8:34 am Post subject: |
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So they don't have Sesame Street over there?
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- WeiBe (1987 924S 2.5t) - 931 S3
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Carrera RSR
Joined: 08 Jan 2010
Posts: 2312
Location: Somerset, UK
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| Posted: Sat Jun 19, 2010 8:34 am Post subject: |
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| Rasta Monsta wrote: | Meh, that's no sin, a hose guy could have the control line as good as new in no time.
How did you adapt the tiny boost tee fittings to the stock line?
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A little added ptfe tape to the tee fittings and jubilee clips wound down tight.
Tested the Tee on my bike track pump. Found one click back off minimum sealed the venting completely so that all pressure went to the wastegate. If the spring and ball bearing were placed back in the tee, no pressure was getting through up to 8 bar!! Removed the ball bearing!!
Will try again tomorrow. I'll also test the boost gauge to see if its showing what it should.
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Sat Jun 19, 2010 9:24 am Post subject: |
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| morghen wrote: | how is that a ''tee''?
thats an inline flow restrictor. |
Morghen, TurboSmart Boost Tee is the "official" name of the product Rasta has installed in his car. Even though, as you point out, it's not a Tee-style (i.e. three port) controller.
Gotta love product marketing, eh?!
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erstwhile owner of just about every 924 variant ever made |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sat Jun 19, 2010 11:02 am Post subject: |
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Silly question. . .you have the directional arrow pointed toward the WG, right?
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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bnoon
Joined: 12 Oct 2009
Posts: 607
Location: West Des Moines, IA USA
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| Posted: Sat Jun 19, 2010 11:13 am Post subject: |
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If it's installed backwards, at the lowest setting, you're actually at the mercy of the wastegate spring = unlimited boost until exhaust gases overcome spring pressure! Which is exactly what Carrera RSR is seeing. 100%, has to be something leaking all of the boost reference away from the wastegate. Only thing it can be given the parts installed and the changes that he made. Installed backwards, gets my vote.
[I edited my post to remove false information, the above remains true though]
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'80 924 Turbo - SOLD!
1986 Porsche 944 Turbo - SOLD!
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