AMS-500 if I don't want data logging?

[Blown347Hatch]

I like to keep things as simple as possible.

All I really want to do is control the boost on the trans brake, and then program it to gradually come on during the run. I don't care to datalog.

Besides data logging, is there something else that I may need that the AMS-500 does not offer?

[conbread]

oneday you may run out of ramp rate and want more, then you will wish you would of got'en the 1000

[Drlee50]

run out of ramp rate? the ams 500is adjustable and has pretty much any rate you would want from instant to like seconds.   ??? what do you mean exactly?  i have mine set to like .5  or .9 seconds currently.

[blown385]

It ramps target pressure per sec. .This target pressure is to the top of the gate , not total boost numbers .

You have to choose from :

0 = Maximum ramp rate.              8 = 8psi per second.
1 = 1psi per second.                   9 = 9psi per second.
2 = 2psi per second.                   A = 15psi per second.
3 = 3psi per second.                   B = 20psi per second.
4 = 4psi per second.                   C = 30psi per second.
5 = 5psi per second.                   D = 40psi per second.
6 = 6psi per second.                   E = 50psi per second.
7 = 7psi per second.                   F = 60psi per second.


So if you need to target 12psi per sec , you cant do it .

It goes from 9psi to 15 .   Then in 5psi increments from there .   I'm in the same dilemma now using CO2 .   If I use the light spring to get the boost down to 6psi on the brake .  I have to run 15 on the AMS500 to make 16psi of boost .  

So there is no way for me to experiment around a target pressure of 15 .  It goes from 9 to 15 to 20



Only thing to do now is go with a heavier spring to get better adjust ability  .   This will give no control on the brake .    

[Geddy2112]

Gee, i am confused.  I didn't have a problem either.  My LMA3 log shows exactly what boost i wanted.  It was dead on with the CO2.

I left with 5psi and ramp the other 5lbs 1 psi per sec using CO2.  When i cross the line, it was at 10lbs total.  I had a 5lb spring in the wastegate.



 

[Blown347Hatch]

I am wondering, for those who need 12 PSI/second in the above example, would this be because 15 PSI/second would blow off the tires? 

Let me know, and keep the responses coming.  I am learning from them, and would think others might too.   

[blown385]

I am wondering, for those who need 12 PSI/second in the above example, would this be because 15 PSI/second would blow off the tires?  

Exactly .  According to data logs on my best pass , mine will handle 14psi per sec .   Any more it will blow the tires off .

This graph shows me leaving at 3500rpm .   Each square is 1 sec .   ( line in the middle is boost )

This was done with no ramp rate and no CO2 , controller set to make 16 psi as fast as it can .  It just so happens to make 14 in the first sec.   If I try to raise it to 18 , it will make 16 in the first sec , and blow the tires off .

Obviously this is why I need the ramp rate .   I will just have to use a heavier spring and control launch boost with the 2-step .

[Blown347Hatch]

Exactly .  According to data logs on my best pass , mine will handle 14psi per sec .   Any more it will blow the tires off .

This graph shows me leaving at 3500rpm .   Each square is 1 sec .   ( line in the middle is boost )

This was done with no ramp rate and no CO2 , controller set to make 16 psi as fast as it can .  It just so happens to make 14 in the first sec.   If I try to raise it to 18 , it will make 16 in the first sec , and blow the tires off .

Obviously this is why I need the ramp rate .   I will just have to use a heavier spring and control launch boost with the 2-step .

Interesting.  You need a laptop for this I presume.  You do trial-and-error to finally establish how much boost/rate your car can hook and datalog along the way to put it in graph form?   

[blown385]

Interesting.  You need a laptop for this I presume.  You do trial-and-error to finally establish how much boost/rate your car can hook and datalog along the way to put it in graph form?   

The graph above was using the Altronics O2 data logger and a lap top .    I just got the CO2 hooked up to the AMS and havent had a chance to use the ramp rate but one time .  It was set on 15per sec . but I had coil problems and the run wasnt great .   

It did hook it set on 15 though , so maybe I will be ok with that ramp rate .    The next one available is 20 and I know it wont be able to hook that .


Graph is of my best run and was done without the ramp rate , lightest WG spring , bottom port of WG to atmosphere , AMS set on 6 , and no CO2 .

Made 16.5psi of boost , 14 in the first sec. of the run .  Leaving on 6psi .

Now with CO2 , I've hooked up the bottom port of the WG to manifold , and it takes 15 target pressure on the AMS to make 16psi of boost .



So basically I'm guessing at the ramp rate .  And it will be trial and error from there .

Or I will go back to max rate and give her hell !   

[Blown347Hatch]

Cool.  Thanks for the information.  Keep us posted on how you hook, how much you can get away with.   

[blown385]

Cool.  Thanks for the information.  Keep us posted on how you hook, how much you can get away with.   

No problem .      I wouldnt think that most set-ups would need 15psi on the gate to make 16psi of boost so most could probably get away with using the ramp rate up to 9 on the AMS .   I guess it all comes down to back pressure .

[Blown347Hatch]

No problem .      I wouldnt think that most set-ups would need 15psi on the gate to make 16psi of boost so most could probably get away with using the ramp rate up to 9 on the AMS .   I guess it all comes down to back pressure .

I think the 500 will probably be enough for my purposes.