1.8 EWG gt2560 - Page 2 - Miata Turbo Forum -Boost cars, acquire cats.

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Old 09-04-2016, 02:51 PM   #21
Join Date: Aug 2016
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You need to set the spring pressure, in the AEM Tru-Boost, lower than wastegate spring pressure. Otherwise the wastegate will be stuck all the way closed until 13PSI(or whatever your wastegate spring is at) creating fastest spool, but will spike at high RPM. You can even start at 3PSI and adjust gain and other functions to gain extra spool without inducing spiking. Adjust the spring pressure up until you start seeing a spike, then reduce.

Here's a link to the manual below.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&u act=8&ved=0ahUKEwiGpLfvrfbOAhWB6iYKHbj8CF4QFghPMAE &url=http%3A%2F%2Faemelectronics.com%2Ffiles%2Fins tructions%2F30-4350%2520Tru-Boost%2520Controller%2520Gauge.pdf&usg=AFQjCNHGQKM t7LUyiEpVz2vboo_F1Bqx_Q&sig2=OSFQfUmZM-8wEIGNZtF3oA

Originally Posted by AEM User Manual View Post
Spring Pressure: (SPr – 2.00)
Enter the waste gate spring pressure(3psi less than your spring). The Tru Boost will keep the boost solenoid open from 1 psi until boost exceeds the selected value. This value can be adjusted to reduce lead in boost spikes or reduce spool up time. If the spring pressure is unknown, a conservative starting value of 5 is suggested..

Originally Posted by LownSlow616 View Post
I have an aem tru boost. I can set at which pressure the solenoid stops sending pressure to the top of the diaphragm(holding it closed)
If i set that number near or above the spring pressure, it will spike when i shift at high rpms
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Old 09-04-2016, 05:16 PM   #22
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I bought the tru boost for this setting alone. But if i set the "SPR" setting anywhere near the actual spring rate, it spikes.

Its not as bad as it seems. I get 9-10 psi around 3000 on the street and full boost around 4000. It still goes pretty good
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Old 09-05-2016, 04:10 AM   #23
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10 psi at 3000 rpm sounds about normal for a 2560.
Your numbers are pretty good for a base timing map and actually seems aligned with the 2560 car Elior is talking about (I know the car as well). I bet that if you play with the timing you can extract a lot more.

Last edited by yossi126; 09-05-2016 at 07:10 AM.
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Old 09-05-2016, 06:20 AM   #24
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I tune them exactly like this on purpose.

Id say add timing and some boost and move it to 280 odd.

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