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T-5R boost gauge

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Old May 17th, 2019, 22:47   #1
GMC
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Default T-5R boost gauge

Where does your boost gauge needle go to on your T-5R?
Mine goes off the scale....way off, about 5mm beyond the end of the scale! I'll try to get a picture when I'm out on Sunday.

When on full boost it pulls like a train, but when on full boost for a few seconds, always in 4th or 5th gear, it'll suddenly cut the boost which makes me thinking its over-boosting because maybe the boost sensor (TCV) is faulty?

It never happens in 1st, 2nd or 3rd gear as I need to move up a gear before it occurs.

I'm thinking about temporarily fitting a scaled boost gauge to see how much boost its actually generating!

Any thoughts would be appreciated
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1995 855 T-5R Manual - Gull Yellow
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2000 Honda Accord Type R - Red
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Old May 22nd, 2019, 17:56   #2
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Originally Posted by GMC View Post
Where does your boost gauge needle go to on your T-5R?
Mine goes off the scale....way off, about 5mm beyond the end of the scale! I'll try to get a picture when I'm out on Sunday.

When on full boost it pulls like a train, but when on full boost for a few seconds, always in 4th or 5th gear, it'll suddenly cut the boost which makes me thinking its over-boosting because maybe the boost sensor (TCV) is faulty?

It never happens in 1st, 2nd or 3rd gear as I need to move up a gear before it occurs.

I'm thinking about temporarily fitting a scaled boost gauge to see how much boost its actually generating!

Any thoughts would be appreciated

Id check the waste gate actuator pipes and connections onto the TCV. They are know to rot and will give you the issue you are having.

Uncontrolled boost with the possibility of a bent rod at low RPM
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Old Jun 23rd, 2019, 21:41   #3
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Thanks again Winsox. Sorry for the delay responding, I've be so busy with work I've just made it back into the garage today! You were spot-on, both pipes running to the actuator & turbo had seen better days. Replaced both and things are back to normal!
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1995 855 T-5R Manual - Gull Yellow
1998 V70R AWD Auto - Saffron

2000 Honda Accord Type R - Red
2008 V50 D5 SE Lux - Blue(Daily Driver)
2015 Audi A3 184 TDi Quattro - Grey (The Wife's!)

Last edited by GMC; Jun 23rd, 2019 at 21:47.
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Old Jun 23rd, 2019, 21:43   #4
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Thanks again Winston. Sorry for the delay responding, I've be so busy with work I've just made it back into the garage today! You were spot-on, both pipes running to the actuator & turbo had seen better days. Replaced both and things are back to normal!
Glad u got it fixed !
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