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Boost Gauge recommendations?

My shop wants me to pop in an external boost gauge to see what is really happening, not sure what is normally used. I think a 20 PSI gauge would be the most accurate in my case (PSI-BAR chart I found below) but alway like to hear opinions on brands and designs. So far I like the Autometer though I would rather not have vacuum (do I need it?) on the gauge..
http://egauges.com/vdo_ind.asp?Type=Turbo_Boost&Series=Ultra_Lite&PN=ATM-4401


1.00 0.07
2.00 0.14
3.00 0.21
4.00 0.28
5.00 0.34
6.00 0.41
7.00 0.48
8.00 0.55
9.00 0.62
10.00 0.69
11.00 0.76
12.00 0.83
13.00 0.90
14.00 0.97
15.00 1.03
16.00 1.10
17.00 1.17
18.00 1.24
19.00 1.31
20.00 1.38
21.00 1.45
22.00 1.52
23.00 1.59
24.00 1.65
25.00 1.72

Thanks!
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Old 05-02-2007, 05:55 AM
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I have a NHS telltale boost gauge, which seems pretty accurate and reads pretty much the same boost that's reported on my Apexi AVC-R EBC.
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Old 05-02-2007, 08:26 AM
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I HAVE THE 935 VACUM AND JUST HOOKED UP THE STOCK ONE IN THE TACH AND THEY READ PRETTY MUCH THE SAME.
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Old 05-02-2007, 10:59 AM
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I ordered a BlownSix design (Blownsixdesign.com) boost gauge a month ago,they were suppose to start shipping May 1st., still haven't seen it yet, I'll post back my expirience with the unit, as soon as I receive it.Candy.
Old 05-04-2007, 08:41 AM
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Hooked mine up (came with right fittings!) and my battery ded... sheesh. Damn duct tape came off bonnet switch.
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Old 05-04-2007, 08:48 AM
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i have that same boost.vac gauge as in the link. Easy install, mechanical, you cant fu-k it up. and cheap. I like the vac because if there was some serious air leak you wouldn't acheive negative. So normal running always shows a good reading on the neg side.
I like it alot. I guess thats my 2 cents
also, I like the fact that i have it plumbed straight to the throttle body. This reading will always be right if the integrity of the tubing remains intact
Old 05-04-2007, 08:52 AM
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I ended up with an AutoPower 0-25 PSI black/red needle 2 5/8 gauge. I wanted as wide a grad as I could get within what my car can put out. Guess i'll know that in another hour or so... It plumbed in in place of the OB switch for testing but i'll replace the OEM boost sender down the road..
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Old 05-04-2007, 09:08 AM
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OK -Installed the PSI boost gauge using the OB switch hole, taped it to my dash and took her for a run. Pulled like a freight train in 2nd right to redline and got to 17+/- PSI (1.17 Bar) and held there. I believe at 3500 I am around 14-15 PSI (around 1 BAR) which is where the OB switch cut it off when it was connected. I felt the Wastegate silencer/pipe and it was fairly hot also so I assume it is opening at around the 1.1 Bar mark. The PSI gauge goes right down to 0 as it should when I get out of it or stop. The dash gauge reads .3 Bar minimum..

Should I worry about getting over 1 Bar and change the Wastegate spring to .8 (or close)?

Thanks
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Old 05-04-2007, 12:59 PM
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Yes, I would lower your boost pressure for lots of safety reasons. I guess it depends if you mind something breaking.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

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Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 05-05-2007, 05:02 AM
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Thanks Nathan, I guess the question is how I should achieve it? I'm thinking a .9 bar (13 PSI) spring will do it, is that a reasonable assumption?

Thanks again for all the input you've given!
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Old 05-05-2007, 05:18 AM
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You say you saw 1.17bar ?
So really you need to lower buy .2bar.
If you do have a 1bar spring installed then it would seem you need a .8bar spring.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 05-05-2007, 05:46 AM
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Quote:
Originally posted by NathanUK
You say you saw 1.17bar ?
So really you need to lower buy .2bar.
If you do have a 1bar spring installed then it would seem you need a .8bar spring.
Yes, the car was accelerating so hard in 2nd I think the (worn out) 295's in the back were breaking loose so it was hard to keep focus on the gauge... It was at least 17 PSI and possibly 18 before the Wastegate opened up. I can only guess at this point what is in there, but it's reasonable to assume it is a 1 Bar spring. I'll look into a .8 bar and also, as the OB switch shouldn't be cutting out at 1 bar from what I have read (1.4 Bar OB cutout is OEM, yes?) a new OB switch may be in order also.
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Old 05-05-2007, 06:19 AM
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I have heard that the overboost cut out switches can vary quite a bit, even when new.

EDIT: I should have stated that you probably don't need a new switch, just alter the boost level with a new spring.
Also, some of the 964t/C2t guys move their switch from before the throttle plate to after it. This helps it getting tripped when you lift off the gas quick. Not really heard anyone say they bothered on a 930 although in theory a 930 with a long neck IC is svery similair.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg

Last edited by NathanUK; 05-05-2007 at 04:24 PM..
Old 05-05-2007, 09:43 AM
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