Joined
·
362 Posts
Went to the Dynojet today but was unable to boost higher than 1.3 bar reliably. I use a Blitz SBC-iD boost controller and have the SP57 with a PHR Stage 1 fuel kit (720cc, dual Walbro pumps).
When the SBC is completely disconnected the boost flies up to over 2 bar so I don't think something is wrong with the wastegate.
When the SBC is connected and you set boost high (like 1.5 bar or higher) it starts to regulate the boost very up/down when boost is over 1.3 bar. It is like a zig zag, goes from 1.5 to 1.2 nad then up to 1.5 but not very fast. It makes no difference whether I use manual or automatic mode on the Blitz, it is unable to keep the boost up.
We think it might have to do with the amount of T's we have used. The vacuum line that goes to the power steering is T'd twice to connect to the boost controller hose that goes to the boost controller display and also to connect to the vacuum hose for the APEX'i electronic boost gauge.
The stock BOV nipple is T'd triple. Once for the pressure sensor for the water injection kit. After that it is T'd for the BOV and after that for the input of the Blitz boost controller solenoid box and the HKS wastegate. The output of the solenoid box is connected to the wastegate as well.
Another possible culprit could be the Hose Techniques hoses I use for all of these vacuum lines. It is very flexible. Is it really suitable for these high boost lines?
Could the amount of T's be the problem? If so can someone explain why?
I know most single turbo installations use a HKS EVC boost controller but the Blizt is rated for 2.5bar so should be suitable for my installation.
We also checked the BOV but it does not leak when the fluttering happens, it is clearly the wategaste that opens and shuts.
Any suggestions would be greatly appreciated.
Flavio
P.S. Best dyno result was 460rwhp at 1.23bar (17.8psi). This was with a nice curve so no zig zag at higher rpm's.
When the SBC is completely disconnected the boost flies up to over 2 bar so I don't think something is wrong with the wastegate.
When the SBC is connected and you set boost high (like 1.5 bar or higher) it starts to regulate the boost very up/down when boost is over 1.3 bar. It is like a zig zag, goes from 1.5 to 1.2 nad then up to 1.5 but not very fast. It makes no difference whether I use manual or automatic mode on the Blitz, it is unable to keep the boost up.
We think it might have to do with the amount of T's we have used. The vacuum line that goes to the power steering is T'd twice to connect to the boost controller hose that goes to the boost controller display and also to connect to the vacuum hose for the APEX'i electronic boost gauge.
The stock BOV nipple is T'd triple. Once for the pressure sensor for the water injection kit. After that it is T'd for the BOV and after that for the input of the Blitz boost controller solenoid box and the HKS wastegate. The output of the solenoid box is connected to the wastegate as well.
Another possible culprit could be the Hose Techniques hoses I use for all of these vacuum lines. It is very flexible. Is it really suitable for these high boost lines?
Could the amount of T's be the problem? If so can someone explain why?
I know most single turbo installations use a HKS EVC boost controller but the Blizt is rated for 2.5bar so should be suitable for my installation.
We also checked the BOV but it does not leak when the fluttering happens, it is clearly the wategaste that opens and shuts.
Any suggestions would be greatly appreciated.
Flavio
P.S. Best dyno result was 460rwhp at 1.23bar (17.8psi). This was with a nice curve so no zig zag at higher rpm's.