SciVision MAF kit for 951 - last few days at $849.95
03-14-2006 | 10:10 PM
#16
Legend Killer
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From: Nor-Cal
Originally Posted by marcoturbo
Transaxle chips use a specific banjo bolt (between IC pipe and CV) to increase boost pressure instead of a MBC.
03-15-2006 | 04:34 AM
#17
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From: France
I think the banjo bolt will only come with the chips. There's no reason to provide a banjo bolt with the MAF kit.
We'd better wait for Tom-Transaxle but I think you can't adjust boost mechanical with banjo bolt.
We'd better wait for Tom-Transaxle but I think you can't adjust boost mechanical with banjo bolt.
03-15-2006 | 03:04 PM
#18
Instructor
Joined: Feb 2002
Posts: 201
Likes: 0
From: Germany
For the MAF kit:
It is a HFM5 MAF based AFM with the same characteristic as the stock AFM. No special chips are required. In a KLR/CV controlled system, the boost will increase faster and follow the KLR boost curve also in the higher rpm range while the resistance of the stock AFM leads to falling boost at the end. In a MBC controlled system you will notice increased boost with the MAF kit and you may have to adjust the MBC.
For the chips:
In a KLR/CV controlled system it is very important that DME and KLR mapping respond to each other. The DME is programmed for a WOT boost curve up to 1.1 bar in the mid range and 1 bar to the end. The KLR is programmed to keep the CV closed until ~1 bar is reached and than to hold the 1 Bar. A jetted Banjo Bolt may be used to get the 1.1 bar overboost in the mid range. This is due to the 1 bar limitation of the sensor in the KLR and was used in the same way by Porsche in the 968 turbo. It does not increase the boost at the higher end nor the maximum power. It may help also in systems with weak CV since it reduces the volume stream. This will be obsolete with the 1.5 bar KLR update.
For the wastegates:
Shimming is a repair procedure to refresh a weak wastegate spring. It should be used if the system could not hold the target boost. In a KLR/CV controlled system it does not increase the target boost. A new wastegate should open by 1.2-1.3 bar exhaust pressure. A weak WG may open below 1.0 bar. But that could also be caused by a closed catalytic converter. In a MBC system, shimming could be used to lift the boost limit of the stock WG beyond 1.2 bar.
It is a HFM5 MAF based AFM with the same characteristic as the stock AFM. No special chips are required. In a KLR/CV controlled system, the boost will increase faster and follow the KLR boost curve also in the higher rpm range while the resistance of the stock AFM leads to falling boost at the end. In a MBC controlled system you will notice increased boost with the MAF kit and you may have to adjust the MBC.
For the chips:
In a KLR/CV controlled system it is very important that DME and KLR mapping respond to each other. The DME is programmed for a WOT boost curve up to 1.1 bar in the mid range and 1 bar to the end. The KLR is programmed to keep the CV closed until ~1 bar is reached and than to hold the 1 Bar. A jetted Banjo Bolt may be used to get the 1.1 bar overboost in the mid range. This is due to the 1 bar limitation of the sensor in the KLR and was used in the same way by Porsche in the 968 turbo. It does not increase the boost at the higher end nor the maximum power. It may help also in systems with weak CV since it reduces the volume stream. This will be obsolete with the 1.5 bar KLR update.
For the wastegates:
Shimming is a repair procedure to refresh a weak wastegate spring. It should be used if the system could not hold the target boost. In a KLR/CV controlled system it does not increase the target boost. A new wastegate should open by 1.2-1.3 bar exhaust pressure. A weak WG may open below 1.0 bar. But that could also be caused by a closed catalytic converter. In a MBC system, shimming could be used to lift the boost limit of the stock WG beyond 1.2 bar.
03-15-2006 | 03:06 PM
#19
Thread Starter
Racer
Joined: Sep 2005
Posts: 254
Likes: 0
From: Milton Keynes, UK
Hi All,
You can use a banjo bolt, but we supply wastegate shims to pre-load the wastegate. The KLR is used to regulate boost, using the cycling valve (as Porsche intended). However, unless the wastegate is really weak, it's probably not necessary to use the shims. Boost can be regulated easilly to 1.0 bar as the air signal is switched quickly by the KLR.
Regards.
Andrew
www.promaxmotorsport.com
You can use a banjo bolt, but we supply wastegate shims to pre-load the wastegate. The KLR is used to regulate boost, using the cycling valve (as Porsche intended). However, unless the wastegate is really weak, it's probably not necessary to use the shims. Boost can be regulated easilly to 1.0 bar as the air signal is switched quickly by the KLR.
Regards.
Andrew
www.promaxmotorsport.com
03-15-2006 | 03:15 PM
#20
Legend Killer
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From: Nor-Cal
Originally Posted by Transaxle
For the MAF kit:
It is a HFM5 MAF based AFM with the same characteristic as the stock AFM. No special chips are required. In a KLR/CV controlled system, the boost will increase faster and follow the KLR boost curve also in the higher rpm range while the resistance of the stock AFM leads to falling boost at the end. In a MBC controlled system you will notice increased boost with the MAF kit and you may have to adjust the MBC.
For the chips:
In a KLR/CV controlled system it is very important that DME and KLR mapping respond to each other. The DME is programmed for a WOT boost curve up to 1.1 bar in the mid range and 1 bar to the end. The KLR is programmed to keep the CV closed until ~1 bar is reached and than to hold the 1 Bar. A jetted Banjo Bolt may be used to get the 1.1 bar overboost in the mid range. This is due to the 1 bar limitation of the sensor in the KLR and was used in the same way by Porsche in the 968 turbo. It does not increase the boost at the higher end nor the maximum power. It may help also in systems with weak CV since it reduces the volume stream. This will be obsolete with the 1.5 bar KLR update.
For the wastegates:
Shimming is a repair procedure to refresh a weak wastegate spring. It should be used if the system could not hold the target boost. In a KLR/CV controlled system it does not increase the target boost. A new wastegate should open by 1.2-1.3 bar exhaust pressure. A weak WG may open below 1.0 bar. But that could also be caused by a closed catalytic converter. In a MBC system, shimming could be used to lift the boost limit of the stock WG beyond 1.2 bar.
It is a HFM5 MAF based AFM with the same characteristic as the stock AFM. No special chips are required. In a KLR/CV controlled system, the boost will increase faster and follow the KLR boost curve also in the higher rpm range while the resistance of the stock AFM leads to falling boost at the end. In a MBC controlled system you will notice increased boost with the MAF kit and you may have to adjust the MBC.
For the chips:
In a KLR/CV controlled system it is very important that DME and KLR mapping respond to each other. The DME is programmed for a WOT boost curve up to 1.1 bar in the mid range and 1 bar to the end. The KLR is programmed to keep the CV closed until ~1 bar is reached and than to hold the 1 Bar. A jetted Banjo Bolt may be used to get the 1.1 bar overboost in the mid range. This is due to the 1 bar limitation of the sensor in the KLR and was used in the same way by Porsche in the 968 turbo. It does not increase the boost at the higher end nor the maximum power. It may help also in systems with weak CV since it reduces the volume stream. This will be obsolete with the 1.5 bar KLR update.
For the wastegates:
Shimming is a repair procedure to refresh a weak wastegate spring. It should be used if the system could not hold the target boost. In a KLR/CV controlled system it does not increase the target boost. A new wastegate should open by 1.2-1.3 bar exhaust pressure. A weak WG may open below 1.0 bar. But that could also be caused by a closed catalytic converter. In a MBC system, shimming could be used to lift the boost limit of the stock WG beyond 1.2 bar.
03-15-2006 | 08:01 PM
#21
Thread Starter
Racer
Joined: Sep 2005
Posts: 254
Likes: 0
From: Milton Keynes, UK
Hi All,
Just a few hours left! Well, it's 18:00 here in sunny Florida and still only 15:00 on the west coast :-)
Any of you reading this, if you've placed an order and I haven't got back to you personally today - I will do before the day is out.
Have a great day.
Regards,
Andrew
Just a few hours left! Well, it's 18:00 here in sunny Florida and still only 15:00 on the west coast :-)
Any of you reading this, if you've placed an order and I haven't got back to you personally today - I will do before the day is out.
Have a great day.
Regards,
Andrew
