Boost/Terminator X
Thread Starter
Joined: Dec 2018
Posts: 446
Likes: 81
From: Midwestern Illinois
Boost/Terminator X Getting the little bugs worked out on my car before I call the tuner. Making a few pulls, my datalog shows fuel pressure climbing by roughly 11psi, AFR learn table shows minimal fuel correction at 12psi, but my MAP sensor is only showing about 4.8 psi. The boost psi gauge on the holley screen has only shown the 4.8psi, KPA shows the same pressure. I verified the map with the barometric channel, key on, engine off, Map is at 98kpa, barometric is at 100.1
I bench tested the map sensor, it will read correctly using regulated shop air.
5.3, small tsp cam. Vortech V1 S trim, LS6 intake, speedmax innovations 3 bar map in stock location.
Boost hits 130kpa at roughly 3,000rpm (don't remember exactly) and just stays there, no sign of belt slip.
Looking for ideas on the boost discrepancy.
I bench tested the map sensor, it will read correctly using regulated shop air.
5.3, small tsp cam. Vortech V1 S trim, LS6 intake, speedmax innovations 3 bar map in stock location.
Boost hits 130kpa at roughly 3,000rpm (don't remember exactly) and just stays there, no sign of belt slip.
Looking for ideas on the boost discrepancy.
Thread Starter
Joined: Dec 2018
Posts: 446
Likes: 81
From: Midwestern Illinois
Yes, and functioning properly. I now believe I have belt slip, but at the crank pulley. Due to the chassis, and placement of some front accessories, good belt wrap on the crank while having clearance of everything else is difficult.
What are you using for fuel regulator? It almost seems to me like your boost reference may be adding more fuel than you need. Which would make sense if you have more fuel PSI, and minimal fuel corrections in low boost.
Making a few pulls, my datalog shows fuel pressure climbing by roughly 11psi, AFR learn table shows minimal fuel correction at 12psi, but my MAP sensor is only showing about 4.8 psi. The boost psi gauge on the holley screen has only shown the 4.8psi, KPA shows the same pressure. I verified the map with the barometric channel, key on, engine off, Map is at 98kpa, barometric is at 100.1
I bench tested the map sensor, it will read correctly using regulated shop air.
5.3, small tsp cam. Vortech V1 S trim, LS6 intake, speedmax innovations 3 bar map in stock location.
Boost hits 130kpa at roughly 3,000rpm (don't remember exactly) and just stays there, no sign of belt slip.
Looking for ideas on the boost discrepancy.
I bench tested the map sensor, it will read correctly using regulated shop air.
5.3, small tsp cam. Vortech V1 S trim, LS6 intake, speedmax innovations 3 bar map in stock location.
Boost hits 130kpa at roughly 3,000rpm (don't remember exactly) and just stays there, no sign of belt slip.
Looking for ideas on the boost discrepancy.
One sensor or the other has to be having an issue with that kind of discrepancy as standard fuel pressure regulators are a 1:1 ratio... unless when you said it climbed by roughly 11psi you were talking about from when you were cruising in vacuum and not at atmospheric zero like 100 kPa/0 psi?
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Another thing to look at is the fuel pressure sensor scale. I am running Low Dollar Motorsports sensors, and I accidently used the 0-75 psi data on my 0-100 psi sensor in Holley. I couldn't figure out why my fuel pressure was lower and after reviewing everything I messed up my scale.
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