Drop In Boost on RSX -S with K pro.
05-05-2006, 08:17 PM
#1
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Join Date: Feb 2005
Location: Jacksonville, FL, USA
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Drop In Boost on RSX -S with K pro.
Setup: 2005 RSX -S CN KIT, 750CC Injectors, 3in exhaust, No cat, Motec 3Bar , and K pro turbo T3/T61. (Garret version of SC61) and boost control done by the built in boost control feature in the k pro.
Problem : Trying to maintain boost at 12 PSI.
Car builds 12.5PSI @ 5700RPMS then once I hit 7500RPMS boost starts to drop to 11.2 PSI and by the time I get to 8300RPMS I am at 10.1 PSI. I was suspecting the issue was with the cam angles. So I decided to Lock the cam at 30 degrees at 7500RPMS see if held boost and it did not work, lowered cam angles to 25deg and on to 20 and it didnt seem to have any effect . Here is a datalog of the car . The pull was done in 3rd gear any help or advice on what can be the issue would be appreciated.
Checked and Rechecked intercooler piping, no holes, or leaks. Checked the compressor housing vaccum source. Sealed with honda bond.
Ok, so I had suspected that the issue might have come from the boost controller solenoid. I disconected the boost controller and ran a direct vaccum line from the compressor housing of the turbo to the bottom port of the wastegate. The pressure drop was still present . However since I have the .6 bar = 8.7 psi now the pressure drops to about 6.6 psi. I then went a sep further and thinking maybe the 3 bar map sensor was the issue. I disconnected the 3 bar and since i tapped the wire i still had the old map clip there so I connected it to the stock map sensor. Still 2 psi drop from 7k to 8.6k.
Further Information: I used to have a turbonetics 60-1 with a stage 5 exhaust housing. Then the seals went bad on the turbo and I decided to swap it out for a T3/T61 Which is the garret version of the SC61. With the 60-1 I never experienced this issue. Its only since this happend that this issue has come up. The manifod is the same , intercooler, pipes , wastegate as when I had the 60-1.
Problem : Trying to maintain boost at 12 PSI.
Car builds 12.5PSI @ 5700RPMS then once I hit 7500RPMS boost starts to drop to 11.2 PSI and by the time I get to 8300RPMS I am at 10.1 PSI. I was suspecting the issue was with the cam angles. So I decided to Lock the cam at 30 degrees at 7500RPMS see if held boost and it did not work, lowered cam angles to 25deg and on to 20 and it didnt seem to have any effect . Here is a datalog of the car . The pull was done in 3rd gear any help or advice on what can be the issue would be appreciated.
Checked and Rechecked intercooler piping, no holes, or leaks. Checked the compressor housing vaccum source. Sealed with honda bond.
Ok, so I had suspected that the issue might have come from the boost controller solenoid. I disconected the boost controller and ran a direct vaccum line from the compressor housing of the turbo to the bottom port of the wastegate. The pressure drop was still present . However since I have the .6 bar = 8.7 psi now the pressure drops to about 6.6 psi. I then went a sep further and thinking maybe the 3 bar map sensor was the issue. I disconnected the 3 bar and since i tapped the wire i still had the old map clip there so I connected it to the stock map sensor. Still 2 psi drop from 7k to 8.6k.
Further Information: I used to have a turbonetics 60-1 with a stage 5 exhaust housing. Then the seals went bad on the turbo and I decided to swap it out for a T3/T61 Which is the garret version of the SC61. With the 60-1 I never experienced this issue. Its only since this happend that this issue has come up. The manifod is the same , intercooler, pipes , wastegate as when I had the 60-1.
05-06-2006, 05:43 AM
#2
Honda-Tech Member
Re: Drop In Boost on RSX -S with K pro. (aspec04t)
what size wastegate you running and where is it on the manifold?
it could be to small of a wastegate for the size of the turbo you are running. or a poor positioning of the wastegate on the manifold which will cause boost to spike and/or drop off.
it could be to small of a wastegate for the size of the turbo you are running. or a poor positioning of the wastegate on the manifold which will cause boost to spike and/or drop off.
05-07-2006, 07:19 PM
#4
Re: (aspec04t)
What kind of boost controller are you using? If it is an EBC, it is possible to change the gain so that the wastegate opens at the last minute each time, and can hold boost steady. THat is simply an idea... Otherwise, its rather difficult to determine what's going on.
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