Vitesse Stage 5 Spool Up
08-03-2008, 01:30 PM
#16
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Bypass valve is new and have tried different spring combos to no avail. Intake system is all good, vaccum readings are good. I do not have the maf etc as I am on Motec. A/F is good but I dont have the benefit of John tuning my car remotely, however a couple different people have had a go at the mapping and the spoolup has not improved. I would not expect such a difference just from playing with the map, fine tuning to get 2-300 rpm but I am a long way off. Could exhaust leaks pre turbo make this much difference? I have no problem making 18psi up top just not getting the spoolup....
Having started with a 968 and doing most of the work myself it has taken a while to get to this stage. Only now do I have my intake temps under control which means attention is turning to the spoolup which is the last link in getting the performance where I want it. If it does turn out to be the turbo (I hope its not) then I will go for a slightly faster spooling turbo with the added benefit being able to change to a BB core while I am in there. However I want to make sure the fundamentals are right first as no point in fixing what isnt broken!
Having started with a 968 and doing most of the work myself it has taken a while to get to this stage. Only now do I have my intake temps under control which means attention is turning to the spoolup which is the last link in getting the performance where I want it. If it does turn out to be the turbo (I hope its not) then I will go for a slightly faster spooling turbo with the added benefit being able to change to a BB core while I am in there. However I want to make sure the fundamentals are right first as no point in fixing what isnt broken!
08-03-2008, 01:34 PM
#17
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Nick, you have a early Stage 5, built prior to the turbos line upgrade that took place a couple of years ago. With the early turbo, you should be seeing 1 bar boost by 3300-3600RPM. Tom has a more recent turbo (different that the turbo you have). The new version of the Stage 5 should make 1bar boost 3000-3300rpm.
08-03-2008, 02:28 PM
#18
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08-03-2008, 02:38 PM
#19
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The signal goes from the MAF to the SMT6, then gets adjusted inside the SMT6, and then goes to Pin 7 of the DME as adjusted. My user input is on Pin 7 of the DME (after adjustments by the SMT6). The SMT6 itself logs the raw signal from the MAF, so the two logs together show the voltage difference from the SMT6 itslef, if that makes any sense...
08-03-2008, 03:05 PM
#22
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I couldn't think of anything more useful on the zeit log... it helps troubleshooting to have the wideband and pin 7 in same file. And, before you say it, I've also piped the wideband into the SMT6 now... 
Edit: Oops, re-reading my post, I see it suggests the SMT6 logs "only" the MAF -- which is clearly not the case
Edit: Oops, re-reading my post, I see it suggests the SMT6 logs "only" the MAF -- which is clearly not the case
08-03-2008, 03:36 PM
#23
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08-03-2008, 03:59 PM
#24
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Tom, If your EGT kit generates a 0-5Vdc signal, you can log it in the PiggyBack and if the EGTs get over a certain value, you can trigger EGT overboost with the V-FLEX software. Actually, in addition to boost, you can log one more 0-5Vdc signal (Intake Temps, Oil Temps, Water Temps or EGT), and trigger over-limit protection based on a preset value. So you will have Rev-Limit, Overboost and over-whatever you want as a third parameter.
08-03-2008, 07:13 PM
#25
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The signal goes from the MAF to the SMT6, then gets adjusted inside the SMT6, and then goes to Pin 7 of the DME as adjusted. My user input is on Pin 7 of the DME (after adjustments by the SMT6). The SMT6 itself logs the raw signal from the MAF, so the two logs together show the voltage difference from the SMT6 itslef, if that makes any sense...
08-03-2008, 07:13 PM
#26
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Tom, If your EGT kit generates a 0-5Vdc signal, you can log it in the PiggyBack and if the EGTs get over a certain value, you can trigger EGT overboost with the V-FLEX software. Actually, in addition to boost, you can log one more 0-5Vdc signal (Intake Temps, Oil Temps, Water Temps or EGT), and trigger over-limit protection based on a preset value. So you will have Rev-Limit, Overboost and over-whatever you want as a third parameter.
08-03-2008, 07:28 PM
#28
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Tom, If your EGT kit generates a 0-5Vdc signal, you can log it in the PiggyBack and if the EGTs get over a certain value, you can trigger EGT overboost with the V-FLEX software. Actually, in addition to boost, you can log one more 0-5Vdc signal (Intake Temps, Oil Temps, Water Temps or EGT), and trigger over-limit protection based on a preset value. So you will have Rev-Limit, Overboost and over-whatever you want as a third parameter.
08-03-2008, 07:34 PM
#29
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Tom, the V-FLEX is the foundation for many mor ethings to come . Yes, if you have the Zeitronix configurable based on multiple variables (AND / OR), if the Zeitronix has a output based on the alarm, you can use it. It must go to ground!
Keep in mind, the V-FLEX will not trigger below 2800rpm and it needs a slight load. This is by design, if external triggering systems go bad, we want you to be able to drive the car in detuned mode till you fix the problem.
. Yes, if you have the Zeitronix configurable based on multiple variables (AND / OR), if the Zeitronix has a output based on the alarm, you can use it. It must go to ground! Keep in mind, the V-FLEX will not trigger below 2800rpm and it needs a slight load. This is by design, if external triggering systems go bad, we want you to be able to drive the car in detuned mode till you fix the problem.
08-03-2008, 11:03 PM
#30
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I can also attest to the Stg 5 turbo spooling up just fine. We don't have data logs, but I'd feel confidant enough to put it on a 2.5L car....which might just happen.