Thread: Damned MBC. Pegged Boost guage 35+ Psi.. Neat Log..

Hehehhe.. Ive been just hand tightening the lock nut on the top of the Slowboy MBC ive been using..

Weeelll I gues that wasnt such a good idea.. Yahhh soo it backed all the way out and fell out.. And Ive now discovered that the slowboy mbc is double-seated.. so without any spring pressure the valve closes and the wastegate gets zero pressure.. Good thing this was only in 3rd gear and only lasted a second before I let off.. Lemme tell yah tho.. It was a scary second.. :)


Thankfully the engine still runs. No damage that i can tell so far..

Note the duty cycle on my 680cc injectors.. It pegged my boost guage to over 35 psi..

Poor car.. I normally hold about 21-22 degrees of timing around 20 PSI on pump gas all the way to redline..

I guess 40 counts of knock will drop you to 5 degrees or so.. haha..


TIMA-TEMP-----O2 Volt----TPS------MAF--------RPM----Knock------Inj PW------Inj DC
28?---206.4?F---0.82V ---7.8%-----239.0Hz---4750---------0---------0.00ms-------0%
29?---206.4?F---0.31V---10.2%----201.3Hz---4719---------0---------2.56ms------12%
41?---206.4?F---0.78V---52.9%----616.4Hz---4719---------0---------6.66ms------33%
28?---206.4?F---0.82V---56.5%----792.5Hz---4844---------0---------8.70ms-----45%
25?---206.4?F---0.84V---100.0%--1107.0Hz---4781--------0--------12.54ms-----64% <--- Boost ~ 18-20 PSI here..
13?---206.4?F---0.80V---100.0%--1723.5Hz---4844-------23--------18.18ms-----94%
11?---206.4?F---0.78V---100.0%--1811.5Hz---4813-------25--------18.94ms-----97%
10?---206.4?F---0.78V---100.0%--1987.6Hz---5063-------36--------19.46ms----105% <--- Over 30 PSI
5?----206.4?F---0.76V----100.0%--2063.1Hz---5031-------41-------19.97ms----107%
5?----206.4?F---0.76V----100.0%--2075.7Hz---5250-------42-------19.71ms----110%
6?----206.4?F---0.76V----100.0%--2075.7Hz---5219-------43-------19.97ms----111%
5?----206.4?F---0.76V----100.0%--2100.9Hz---5438-------42-------19.71ms----114%
5?----206.4?F---0.74V----100.0%--2163.8Hz---5344-------43-------19.71ms----112%
6?----206.4?F---0.76V----100.0%--2201.5Hz---5469-------43-------19.71ms----115%
7?----206.4?F---0.76V----100.0%--2151.2Hz---5500-------42-------19.71ms----115%
7?----206.4?F---0.74V----100.0%--2138.6Hz---5594-------41-------19.71ms----117%
7?----209.8?F---0.74V----100.0%--2188.9Hz---5469-------43-------19.46ms----113%
8?----209.8?F---0.76V----100.0%--2239.2Hz---5688-------43-------19.20ms----116%
8?----209.8?F---0.76V----100.0%--2214.1Hz---5688-------43-------19.20ms----116%
8?----209.8?F---0.76V----100.0%--2314.7Hz---5781-------43-------19.46ms----120%
9?----209.8?F---0.74V----100.0%--2277.0Hz---5813-------42-------19.46ms----120%
9?----209.8?F---0.74V----100.0%--2289.6Hz---5781-------42-------19.20ms----118%
9?----209.8?F---0.74V----100.0%--2327.3Hz---5844-------43-------19.20ms----119% <---- God only knows how many PSI
8?----209.8?F---0.74V----100.0%--2302.1Hz---5906-------43-------18.94ms----119%

weeee!

hopefully everything checks out ok. so what did 35psi+ feel like?

For an instant it felt pretty good.. But im sure once it got over 25 lbs it wasnt making much power..

what are you using to datalog?

just a custom rip of mmcd with another custom deal to convert the logs into excel spreadsheets..

I also use TMO's datalogger when I happen to have a laptop with me..

Originally Posted by BenGSX

just a custom rip of mmcd with another custom deal to convert the logs into excel spreadsheets..

I also use TMO's datalogger when I happen to have a laptop with me..

Ohh, same as me, as far as the mmcd.