Have a 99 Busa with a modified Mr Turbo setup. Bike sat unused for most it's life due to medical problems... has less than 8,000 miles.
Summer 2008... worked on motor... no issues... just to make more durable. All APE products... valve springs & retainers, head studs, main bearing studs, Cometic gaskets (including .030 MLS Head Gasket), high volume oil pump gear, minor clutch mods. Still have original pistons, rings and bearings as less than 500 miles since turbo was installed.
Summer 2009... worked on turbo system... realized what garbage Mr Turbo sold. Made new plenum... installed new Tial wastegate & BOV... and literally replaced every component from his kit with the exception of the header and Rajay turbo which have been fine.
Summer 2010... figured I only needed to setup the map. The bike would start and idle fine... ran good when I open it up... but surged from richness while cruising. Had some issues with BEGI working properly but they have since been resolved and I seemed to be making headway.
This week... latest LM-2 recording while in garage shows air/fuel stays level until about 2,100 rpm at which point it begins to rapidly fluctuate between 10 and 14... causing the bike to surge.
Today... even though I have an Auto Meter Vacuum/Boost Gauge mounted on my dash, I decided to connect a standard automotive vacuum tester to TB#1. The needle was highly erratic during idle... bounced rapidly between 5-21 psi... same result when connected to TB#4. I didn't expect this but the Auto Meter gauge has a built in restrictor which might explain why it doesn't show any erratic readings.
Not sure what this means or where to go from here. Tried searching the internet and one site mentioned my erratic reading was an indication of a blown head gasket... but I don't want to go there unless I'm sure. I'd really appreciate some help. Thanks
Cobra
Summer 2008... worked on motor... no issues... just to make more durable. All APE products... valve springs & retainers, head studs, main bearing studs, Cometic gaskets (including .030 MLS Head Gasket), high volume oil pump gear, minor clutch mods. Still have original pistons, rings and bearings as less than 500 miles since turbo was installed.
Summer 2009... worked on turbo system... realized what garbage Mr Turbo sold. Made new plenum... installed new Tial wastegate & BOV... and literally replaced every component from his kit with the exception of the header and Rajay turbo which have been fine.
Summer 2010... figured I only needed to setup the map. The bike would start and idle fine... ran good when I open it up... but surged from richness while cruising. Had some issues with BEGI working properly but they have since been resolved and I seemed to be making headway.
This week... latest LM-2 recording while in garage shows air/fuel stays level until about 2,100 rpm at which point it begins to rapidly fluctuate between 10 and 14... causing the bike to surge.
Today... even though I have an Auto Meter Vacuum/Boost Gauge mounted on my dash, I decided to connect a standard automotive vacuum tester to TB#1. The needle was highly erratic during idle... bounced rapidly between 5-21 psi... same result when connected to TB#4. I didn't expect this but the Auto Meter gauge has a built in restrictor which might explain why it doesn't show any erratic readings.
Not sure what this means or where to go from here. Tried searching the internet and one site mentioned my erratic reading was an indication of a blown head gasket... but I don't want to go there unless I'm sure. I'd really appreciate some help. Thanks
Cobra