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Writer/Teacher
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Inconsistant Boost?
This is more of a feeling I have than a real tangible problem...
My car always pulls nicely when on boost. Sometimes, however, it feels like it's generating a lot more boost than others. For example, yesterday I hit the throttle at 3500 in 3rd gear on the highway, and the car just took off. Nice. When I tried to recreate the feeling a minute later, though - at the same RPM in the same gear - it wasn't as drastic. If this is happening, is there a reason for it?
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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03-14-2007, 06:36 AM
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Join Date: Oct 2006
Location: Laguna Vista
Posts: 2,203
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Seat of the pants feeling are not real reliable. You need to do your test on the same stretch of the road from the same place starting at the same rpm and same speed, same gear etc. etc.. with a stop watch time the boost build up time a few times that may tell you some thing. You could buy one of those 'G' meters, but I don't know how accurate or repeatable they are. (dyno tests will show you whats what but $$$$ )
Sox
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"Little problems always come back and bring bigger friends with them". 1986 951"MADDOG" black Dual port WG, 4 port control valve with EBC |
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03-14-2007, 08:19 AM
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Join Date: Aug 2006
Location: Easley, SC
Posts: 19
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Turbo engines can easily get "heat soak". This will rob the car of some power for a little while until the turbo cools off.
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'86 Garnet Red Metallic 951 '02 Amulet Red A4 1.8t Quattro |
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03-14-2007, 11:44 AM
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Engine swap pro
Join Date: Apr 2006
Location: Greater Seattle area
Posts: 351
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Quote:
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87 951 ---- "R2" - under the knife 87 951 ---- "R1" Parting out - Gave to a good friend 88 951 ---- Black one - recieved as a trade for my 87 - very mint - parting out 06 WRX ---- The "RUE" |
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03-14-2007, 04:48 PM
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Join Date: Jul 2001
Location: Edmonton, Alberta, Canada
Posts: 4,530
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CJ those type of things are hard to diagnose. It could be anything from an exhaust leak to a crappy recirculating valve and another 20 things in between.
OT :The intercooler is truly a piece of crap on these cars. Just swapped mine out. Same setup as I had before. NOW I can jab at the throttle and get 5-7 psi off boost at with no load. WAY too much restriction in that thing.
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Alex - PCA Polar Region - Boxster Muncher 86' 944 Turbo - Megasquirt - 326 rwhp/340lbft @ 18 psi SOLD www.edmontonhomelife.com www.edmontonrealestate.ws |
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03-14-2007, 04:58 PM
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Registered
Join Date: Aug 2006
Location: Easley, SC
Posts: 19
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Quote:
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'86 Garnet Red Metallic 951 '02 Amulet Red A4 1.8t Quattro |
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03-14-2007, 05:11 PM
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Writer/Teacher
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Thanks for the info, guys. I will keep an eye on it, maybe go and tighten everything up for good measure.
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Current Stable: Black 07 Porsche 987 Cayman S: Long-Tube Headers; FabSpeed Exhaust; VividRacing ECU Tune; IPD Plenum; 997GT3 Throttle Body. Blue 1983 Porsche 928S. 1985.5 Porsche 944 Rat Rod. 2011 Acura MDX. 2008 Mazda 3. Gone But Not Forgotten:Garnet Red 86 Porsche 951("The Purple Pig"). Alpine White 83 Porsche 944 ("Alpine Wolf"). Guards Red 84 Porsche 944. |
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03-15-2007, 06:17 AM
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your turbochrger may be overheating. my car had the same sensation (real) until i replaced the turbo water pump, which had seemed to still be working b/c it passed the pressure test. i've been told turbos also overheat b/c the intercooler is coated w/ oil
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Trust no one who does not drive a Porsche daily. just kidding. Sort of |
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03-15-2007, 12:27 PM
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2007 Porsche Cayman S
The Viridian Falcon
SOLD! -- The Purple Pig
SOLD! -- Mighty Mouse
SOLD!! -- Alpine Wolf
