the colder weather is here - question about boost

bobcat · Oct 9th, 2005, 21:48

As im sure you all aware the air temps are getting colder and our cars are able to make more boost.

the below question is more directed at adam than anyone else,

as you know i have an 18t and a 15g map, i run my wgate a bit tighter but not much. recently when going to WOT quickly my boost is rising to 19/20 and then fades slowly.

at 19/20 i get a feeling like when you hit the rpm limiter, it a juddering. is the the ecu boost limit being reached, running lean or a sign of poor stage zero (i have some ht leads ready to fit as mine are original i think).

any ideas.

adieu · Oct 9th, 2005, 22:09

Good question Bob, I know my car feels quicker with the colder weather coming. Can we all expect similair problems? Maybe Don could answer for the MTE/TME owners.

Regards

Iain

Dan F · Oct 9th, 2005, 22:22

Hi.

A properly mapped car should retain the original programs ability to compensate for climate and altitude.

As the density of air entering the engine is increased by the lower ambient temps, intake temps in turn will be a fair bit lower before it even hits the turbo, therefore the ECU should actually reduce boost a little to compensate, as less boost will be required to produce the same results.

Dan.

Oct 9th, 2005, 22:34

Hi Matt,

In fairness I don't know for sure because of the changes you made. Probably the best thing to do would be to drop in at some point so we can check what it is. It may be an overboost, or it may be ignition retard, or indeed something else entirely. If you are concerned, then best to give us a call and bring the car down.

Adam.

Oct 9th, 2005, 21:48	#1
bobcat Premier Member Last Online: Apr 18th, 2024 11:37 Join Date: Dec 2004 Location:	the colder weather is here - question about boost As im sure you all aware the air temps are getting colder and our cars are able to make more boost. the below question is more directed at adam than anyone else, as you know i have an 18t and a 15g map, i run my wgate a bit tighter but not much. recently when going to WOT quickly my boost is rising to 19/20 and then fades slowly. at 19/20 i get a feeling like when you hit the rpm limiter, it a juddering. is the the ecu boost limit being reached, running lean or a sign of poor stage zero (i have some ht leads ready to fit as mine are original i think). any ideas. __________________ Volvo 850R Auto,173K,Bobcat\SW Autos Ecu,18T,Reverse IC,13 Row Engine Oil Cooler,39 Row ATF Cooler,20psi VDO Boost Gauge,6000k HID's (low), Osram 50% Silverstars (High),ITG Filter,OEM Strutbrace,Aerial Down Switch,302mm Front Discs,Ferodo DS2500 Front/Rear,Goodridge SS Hoses,Koni Adjustable Dampers,Eibach Pro Kit, Powerflex Control Arm Bushes, Clear Side Repeaters. http://www.swautos.co.uk SW Auto's Ebay Shop http://www.volvo-tech.co.uk

Oct 9th, 2005, 22:09	#2
adieu Master Member Last Online: Feb 5th, 2021 19:07 Join Date: Dec 2002 Location: swindon	RE: the colder weather is here - question about boost Good question Bob, I know my car feels quicker with the colder weather coming. Can we all expect similair problems? Maybe Don could answer for the MTE/TME owners. Regards Iain __________________ Speed has never killed anyone, suddenly becoming stationary… That’s what gets you. A turbo: Exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster

Oct 9th, 2005, 22:22	#3
Dan F Premier Member Last Online: Apr 7th, 2008 13:05 Join Date: Dec 2001 Location: Worcs	RE: the colder weather is here - question about boost Hi. A properly mapped car should retain the original programs ability to compensate for climate and altitude. As the density of air entering the engine is increased by the lower ambient temps, intake temps in turn will be a fair bit lower before it even hits the turbo, therefore the ECU should actually reduce boost a little to compensate, as less boost will be required to produce the same results. Dan.

Oct 9th, 2005, 22:34	#4
volvotuning Guest Location:	RE: the colder weather is here - question about boost Hi Matt, In fairness I don't know for sure because of the changes you made. Probably the best thing to do would be to drop in at some point so we can check what it is. It may be an overboost, or it may be ignition retard, or indeed something else entirely. If you are concerned, then best to give us a call and bring the car down. Adam.

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