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Old 01-27-2008, 10:10 PM   #1
Blu_Scobbie
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Default Tuning a Prodrive BCS

I recently got a Prodrive BCS from a friend of mine. I've been trying unsuccessfully to tuning it to get back to my stage 2 17psi. I've adjusted the wastegate duty cycle up past where my original map was but I'm still only hitting 13.58psi max. I read somewhere about adjusting turbo dynamics but I can't find it and dont know which map to modify. Can someone please help me. Thanks
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Old 01-27-2008, 11:41 PM   #2
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Your WGDC should be a good amount lower, did you remove the restricter pill? How do you have it connected?
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Old 01-28-2008, 09:45 AM   #3
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I removed all the stock hoses so there is no pill. I connected all the hoses according to this http://www.tarmacwolf.org/dokuwiki/d...boost_solenoid
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Old 01-28-2008, 09:56 AM   #4
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I would like to do this as well... more info please
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Old 01-28-2008, 11:45 AM   #5
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I still have a stock downpipe and target 16psi at sea level...but I live at 6000ft, so i really only see about 13-14 psi. I had 85-95 WGDC at 100% throttle with the stock BCS.

With a Prodrive BCS, my base WGDC at 100% throttle is around 55-60...so it's still pretty high. Interestingly enough, when I head back to sea level, I don't hit 16psi...I fall a short by 0.5-1.0 psi. This is with zero atmospheric compensation in the WGDC.

I have no idea if I'm completely unique or if this is consistent across a range of cars...but maybe my anecdotal experience can help.

-Mike

Last edited by Manbike26; 01-28-2008 at 11:53 AM. Reason: Poor Grammar
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Old 01-28-2008, 11:50 AM   #6
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^^^
Stock map or tuned?
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Old 01-28-2008, 12:26 PM   #7
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Quote:
Originally Posted by Manbike26 View Post
I still have a stock downpipe and target 16psi at sea level...but I live at 6000ft, so i really only see about 13-14 psi. I had 85-95 WGDC at 100% throttle with the stock BCS.

With a Prodrive BCS, my base WGDC at 100% throttle is around 55-60...so it's still pretty high. Interestingly enough, when I head back to sea level, I don't hit 16psi...I fall a short by 0.5-1.0 psi. This is with zero atmospheric compensation in the WGDC.

I have no idea if I'm completely unique or if this is consistent across a range of cars...but maybe my anecdotal experience can help.

-Mike
I think this is very normal regardless of the BCS type.

I have noticed that at sealevel we need more WGDC to hit target boost because the target boost is higher.

Here's an example. Let's say we have a 10 psi actuator and the target boost is 13 psi at sealevel and 11 psi at high altitude. The WGDC necessary to hold boost at 14 psi would definitely be higher.

If the target boost is much greater than the actuator spring load then the difference in WGDC between high altitude and sea level appears to be less.

I have noticed this on stage 2 LGTs but unfortunately, some cars are tuned at high altitude and some cars are tuned at sealevel. I don't have logs of the same car at both altitudes. IMHO, the WGDC by atmospheric compensation should be used but I don't adjust it due to the lack of data.
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Old 01-28-2008, 12:37 PM   #8
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Quote:
Originally Posted by Nuke209 View Post
^^^
Stock map or tuned?
I have done some tinkering in Enginuity, so I suppose it would be considered a tuned map. Most of my efforts have been on the boost/wastegate/turbo dynamics maps.
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Old 01-28-2008, 12:52 PM   #9
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Here's you a good starting point for the Prodrive BCS as far as TD goes.

TD Burst:
Code:
[Table2D]
-2.94	-1.70	-0.77	-0.31	0.00	0.31	0.77	1.70	2.94
-1.50	-0.49	-0.38	-0.19	0.00	0.75	1.00	2.00	3.00
TD Continuous:
Code:
[Table2D]
-2.94	-1.70	-0.77	-0.31	0.00	0.31	0.77	1.70	2.94
-3.00	-2.00	-1.09	-0.70	0.00	0.70	1.20	1.95	3.20
As far as WGD% 46.5% = 21.5psi on this particular car.
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Old 01-28-2008, 01:19 PM   #10
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Quote:
Originally Posted by Manbike26 View Post
I still have a stock downpipe and target 16psi at sea level...but I live at 6000ft, so i really only see about 13-14 psi. I had 85-95 WGDC at 100% throttle with the stock BCS.

With a Prodrive BCS, my base WGDC at 100% throttle is around 55-60...so it's still pretty high. Interestingly enough, when I head back to sea level, I don't hit 16psi...I fall a short by 0.5-1.0 psi. This is with zero atmospheric compensation in the WGDC.

I have no idea if I'm completely unique or if this is consistent across a range of cars...but maybe my anecdotal experience can help.

-Mike
There are several issues with tuning at altitude:
1. The standard ECU defs display target boost with the assumption of sea level. however, the ECU only deals in absolute pressures. So, 16 psig as viewed in Enginuity is really 30.7psi absolute (16 psig + 14.7 psi). If your local atmospheric pressure was 12 psi (and assuming no atmopsheric boost comp see #2), then your actual relative boost target would be 18.7 psig (30.7psia - 12 psi).

2. All ROMs progressively reduce target boost as atmospheric pressure drops to keep the turbo in its efficiency range. At my altitude (5000 feet), this is about -12% (I'm around 12 psi AP typically). However, this is applied to absolute pressure, not relative. So, in the same example, 30.7 psia target * .88 = 27.02 psia new target. This would be a target of 15 psig at the given altitude (27.02 psia - 12 psi). Yours might even lower because you are a 1000 feet higher than me.
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Old 01-29-2008, 10:08 AM   #11
Blu_Scobbie
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Quote:
Originally Posted by testes1010 View Post
Here's you a good starting point for the Prodrive BCS as far as TD goes.

TD Burst:
Code:
[Table2D]
-2.94	-1.70	-0.77	-0.31	0.00	0.31	0.77	1.70	2.94
-1.50	-0.49	-0.38	-0.19	0.00	0.75	1.00	2.00	3.00
TD Continuous:
Code:
[Table2D]
-2.94	-1.70	-0.77	-0.31	0.00	0.31	0.77	1.70	2.94
-3.00	-2.00	-1.09	-0.70	0.00	0.70	1.20	1.95	3.20
As far as WGD% 46.5% = 21.5psi on this particular car.
Thanks, I'm going to give this a try and see what happens
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