dandan Posted October 2, 2003 Share Posted October 2, 2003 My J spec is running seq mode with dsbc installed and running. Few other mods such as exh and lower decat. My question relates to the boost level made under full throttle in seq mode: When i floor the accelerator (or infact increase throttle steady and quick) the boost will rise to 0.5bar, momentarily drop to around zero and then rise fast up to max boost - dependant on setting. Is this correct, should the pressure drop so much during changeover? Quote Link to comment Share on other sites More sharing options...
eyefi Posted October 2, 2003 Share Posted October 2, 2003 Originally posted by dandan Is this correct, should the pressure drop so much during changeover? no, u should only loose a couple of psi Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 2, 2003 Share Posted October 2, 2003 And I'd expect a bit more than 0.5 on the first turbo... Quote Link to comment Share on other sites More sharing options...
dandan Posted October 2, 2003 Author Share Posted October 2, 2003 Thanks guys (Matt- Cheesy pic in Redline TOTBII, well done by the way ) What should i be hitting on no. 1 and what should it drop to in change over? The power drops off a fair bit, short delay and then surge of power as boost builds again. Also either of you have a dsbc and if so do you trust its readings? I ask as I have a difference between that and HKS gauge. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 2, 2003 Share Posted October 2, 2003 Very cheesey grin! Mine usually runs 0.68 on no.1, then drops to about 0.5, then up to 1.2 I'm running the DSBC and HKS gauge, the readings are almost identical... +/-0.1bar either way Quote Link to comment Share on other sites More sharing options...
eyefi Posted October 2, 2003 Share Posted October 2, 2003 Originally posted by dandan (Matt- Cheesy pic in Redline TOTBII, well done by the way ) 13.5 haha! my dsbc and gauge read exactly the same Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 2, 2003 Share Posted October 2, 2003 Least I ran:p Quote Link to comment Share on other sites More sharing options...
eyefi Posted October 2, 2003 Share Posted October 2, 2003 u need to swap out the gauge and bc, see which is wrong. the bc is plumbed correctly? Quote Link to comment Share on other sites More sharing options...
eyefi Posted October 2, 2003 Share Posted October 2, 2003 Originally posted by Matt Harwood Least I ran:p would've probably been quicker :p (to run rather than drive) Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted October 2, 2003 Share Posted October 2, 2003 You bitch! - You're time will come! Quote Link to comment Share on other sites More sharing options...
eyefi Posted October 2, 2003 Share Posted October 2, 2003 laaa laala lala lalaa Quote Link to comment Share on other sites More sharing options...
Scooter Posted October 2, 2003 Share Posted October 2, 2003 Search for 'Dyno result' third thread down. similar dip inbetween turbo's problem, may or may not be relevant (BTW would post the thread link but can't work out how:conf: ) Quote Link to comment Share on other sites More sharing options...
dandan Posted October 2, 2003 Author Share Posted October 2, 2003 Thanks guys, Eyefi..what do you mean by "swap out"? Scooter I found the hread earlier and had a good read. Seems a leaky vac pipe was causing the problem, i will investigate further.. My dsbc and HKS gauge seem to be out by around 0.3bar!!! The dsbc reads higher, so you can imagine I'm a little nervous upping the settings on the dsbc to get the gauge to read 1.0bar or 1.1bar as I may be at 1.3 or 1.4bar! Gonna have to get another gauge temporarily from somewhere to see which is correct. Just been out for a spin...... In 2nd and 3rd at full throttle no.1 won't boost above 0.5-0.55bar. This drops off to about 0.25-0.3bar and then rises to 0.9ish. In 4th from 40mph full throttle, no.1 builds to roughly 0.7bar (0.95 on dsbc) drops to 0.5 then rises again upwards. In 5th from 55/60 the boost rise is almost constant but there is a drop at 0.7 down to 0.5 then quick rise up to full boost. The dip/transition is a whole lot more obvious in 2nd and 3rd, than the higher gears. Just out of interest, what sort of boost do people make in 1st gear (manuals)? Thanks heaps guys, appreciate your input. Quote Link to comment Share on other sites More sharing options...
eyefi Posted October 3, 2003 Share Posted October 3, 2003 Originally posted by dandan Eyefi..what do you mean by "swap out"? find someone who will let u try their equipment in place of yrs. u need to find out what (boost) reading is correct and whether the dsbc is faulty. sounds like u got a leak. Quote Link to comment Share on other sites More sharing options...
THOR Racing Posted October 3, 2003 Share Posted October 3, 2003 Dan, Pop along and put it on my dyno I've done a few tests of mine with simulated failures, like various VSV's stuck open or closed. Just did mine again and got 375RWHP (so getting better) Wish I had more time to spend on my car rather than customers Regards Pete Quote Link to comment Share on other sites More sharing options...
dandan Posted October 3, 2003 Author Share Posted October 3, 2003 Pete, I'm booked in for the 25th anyway, just wanted to get it sorted (or at least know which boost reading is correct) so i can switch from 1.0 to 1.2 bar on the dyno, without any messing around. On the 25th will all cars have fuelling, ignition and boost pressure monitored for the runs? Quote Link to comment Share on other sites More sharing options...
JohnK Posted October 4, 2003 Share Posted October 4, 2003 have a look at this thread boost gauge movie small movie file of my boost gauge when I ran down the strip. Quote Link to comment Share on other sites More sharing options...
THOR Racing Posted October 4, 2003 Share Posted October 4, 2003 On the 25th will all cars have fuelling, ignition and boost pressure monitored for the runs? Fueling, boost, temperature, torque and BHP. Not ignition. regards Pete Quote Link to comment Share on other sites More sharing options...
dandan Posted October 4, 2003 Author Share Posted October 4, 2003 Excellent, Sounds good Pete. Looking forward to it. Quote Link to comment Share on other sites More sharing options...
dandan Posted October 4, 2003 Author Share Posted October 4, 2003 John i dont seem to be able to view it with my current media player and on my crappy dial up that's almost out of the question for now. That's a shame as a comparison would be ideal. Quote Link to comment Share on other sites More sharing options...
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