VEMS and a Knock Light
VEMS and a Knock Light
Though not an accurate/perfectly reliable tool for tuning, is it possible to use an output to flash a dashboard light to alert me that there may be knock? This is more to keep me safe as weather/changes in fuel occur. I don't want to be senselessly driving my car in a dangerous state.
Casey O
Current Attire:
- 2007 Audi A3 3.2 quattro
Past Projects:
- 07 Cooper S - 91 200 20vt - 91 90 20v - 85 4000CS - 96 Audi Cabriolet 5 Spd - 02 A4 1.8T - 91 V8 5 Spd - 01 A6 2.7T 6 Spd Sport - 86 5000CS - 91 100
Current Attire:
- 2007 Audi A3 3.2 quattro
Past Projects:
- 07 Cooper S - 91 200 20vt - 91 90 20v - 85 4000CS - 96 Audi Cabriolet 5 Spd - 02 A4 1.8T - 91 V8 5 Spd - 01 A6 2.7T 6 Spd Sport - 86 5000CS - 91 100
Re: VEMS and a Knock Light
It'd prob be easier to set up a SAAB APC like audifreakjim runs/ran. VEMS supports knock control but I've not heard anyone report the correct settings for the 20vt.
Of course, the criticism of the APC setup is that it is not tuned for the 20vt harmonics http://mswanson.com/~jgreen/APC/APC.html
Of course, the criticism of the APC setup is that it is not tuned for the 20vt harmonics http://mswanson.com/~jgreen/APC/APC.html
Re: VEMS and a Knock Light
WOMBAT wrote:Though not an accurate/perfectly reliable tool for tuning, is it possible to use an output to flash a dashboard light to alert me that there may be knock? This is more to keep me safe as weather/changes in fuel occur. I don't want to be senselessly driving my car in a dangerous state.
On my 944t engine, I've got a J&S Safeguard system that has a dual display gauge that shows knock and AFR. The Safeguard was developed from the OEM 944 KLR system so it has all the correct filtering for it. I think they've designed it so it's more generic though and you can set threshold levels. It could be tied into VEMS, pull timing independently, or just be set to display it.
-Alex-
@vexartmedia @odd.cylinders @5cylinder_porsche
Odd Cylinders YouTube Page
1992 Porsche 968 (07K transplant in progress)
1983 Aud UrQ (MC1, GT2871R, IIc)
1985 Audi 4kq
2003 Audi S8 (Avus/Oxblood; DD; 6MT swap)
@vexartmedia @odd.cylinders @5cylinder_porsche
Odd Cylinders YouTube Page
1992 Porsche 968 (07K transplant in progress)
1983 Aud UrQ (MC1, GT2871R, IIc)
1985 Audi 4kq
2003 Audi S8 (Avus/Oxblood; DD; 6MT swap)
Re: VEMS and a Knock Light
VEMS can deal with the input and output a warning light; we just need to figure out the filter values.
Re: VEMS and a Knock Light
It's not a knock light but Nick has a really nifty safety net set up with his VEMS that watches actual vs. target AFR's. It doesn't necessarily protect you from timing/ignition mishaps but *I would think* it would still alert you to anything major enough to do damage...
-Shawn C.
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
2001 S4 6spd Avant blk/blk - stock daily
2002 01E B6 A4 Built FYF, Built 1.8T, HX35 ~330whp
1989 MC-1 200 Avant- MS1 -Gone but will never forget her lessons
1987 5ktq Sedan - Best $500 beater ever
Re: VEMS and a Knock Light
alxdgr8 wrote:WOMBAT wrote: ... The Safeguard was developed from the OEM 944 KLR system so it has all the correct filtering for it. I think they've designed it so it's more generic though and you can set threshold levels. It could be tied into VEMS, pull timing independently, or just be set to display it.
Alex: I read about the 944 Turbo's individual cylinder knock retard in a 1987 Road & Track Magazine. The fact that it could be done is all it took, and I became obsessed with designing my own version.