Cam phase timing question

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
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Varks
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Cam phase timing question

Post by Varks » Wed Nov 06, 2024 8:45 am

Hi all, I will get some figures uploaded as soon as i can but checking the cam phase timing on the RS with VCDS gave me -11 deg on banks 1 & 2 on measuring block 093 with engine up to normal operating temp,
I know this is well out of normal spec but the engine starts on the button, idles fine and there are no rattles or strange noises coming from the engine at all, I believe it is due a cam belt anyway but i am just wondering if this value would be closer to 0 deg once the belt is changed and cam sprockets reset, i was also wondering if this could anyway effect boost? as i don't have any at all lol, would the fact that the timing is that retarded mean that the ecu can't utilise the VVT causing the car to be in "Limp mode" and restricting the performance,
I have no ecu fault codes at all at the moment and the car doesn't feel too sluggish, just feels like a normally aspirated V8,
I will look at all the parts required for changing the belt and see what the figures are like after its all replaced, I know these figures are usually signs that the chains or tensioners require replacing but as there are no rattles and the chains and tensioners look to be in good condition i just wondered if the belt could be the culprit. Just wanted some advice from people in the know, :bash:
Renault 4 GT Turbo, Series 2 RS Turbo, 90 sport 2.3 20v 5 pot, Subaru Legacy GTB, several A4 S-Line 170's 3.0 tdi Le Mans, 2 x B5 S4, 2003 C5 RS6 in Daytona- 8 pots, 4 Rings!!! :blackrs4:

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Shoppinit
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Re: Cam phase timing question

Post by Shoppinit » Wed Nov 06, 2024 8:56 am

Have a look to see if your ECU has already been flashed. There’s a counter that you can consult with the Vagcom to see the number of obd flashes. If it’s not zero, I would put the standard map on. Who knows what’s been done to the map otherwise?

I don’t think the timing being out would cause your zero boost. Obviously it needs to be fixed. Sounds like you’ve already got a handle on what needs to be done.

Did you measure all EGT sensors?

What boost is the ECU requesting?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Varks
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Re: Cam phase timing question

Post by Varks » Wed Nov 06, 2024 9:43 am

Shoppinit, I measured the EGT values as i have a spare set and thought "easy win" but they were both within 5 deg of eachother, 255 deg just after startup and increased with eachother as the revs increased, so sadly i think they are ok, the MAF's did read slightly different figures, i think bank 2 was nearly 2 x what bank 1 was but i have no codes, i may replace them anyway,
I've not managed to do any log runs to find out what the requested boost is vs actual yet as i am still waiting on the V5 so i can tax it, into the 12th week now! knowing my luck i'd get caught on an ANPR camera,
The car has been mapped, previous owner is on here, stated figures of 550 bhp and 800nm, not sure whats been done tbh,I may look at trying to get hold of a spare ecu and see if that makes any difference, failing that i will have to get the OEM map flashed on, i will do some log runs before that happens though,
Renault 4 GT Turbo, Series 2 RS Turbo, 90 sport 2.3 20v 5 pot, Subaru Legacy GTB, several A4 S-Line 170's 3.0 tdi Le Mans, 2 x B5 S4, 2003 C5 RS6 in Daytona- 8 pots, 4 Rings!!! :blackrs4:

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Shoppinit
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Re: Cam phase timing question

Post by Shoppinit » Wed Nov 06, 2024 10:18 am

How come the V5 is taking so long? Maybe it got lost?

Hard to go much further with diagnostics without knowing whether the car is actually asking for boost or not.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Varks
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Re: Cam phase timing question

Post by Varks » Wed Nov 06, 2024 11:26 am

Long story,
Previous owner sent the old V5 off when he took the private plate off the car ready for the sale, didn't realise it was still listed at his old address, think he had moved house whilst the car was off the road, so the new V5 went to the old address and was then returned to the DVLA, i got the previous V5 with the car so couldn't tax it etc, sent a V62 along with a supporting letter and the £25 postal order to the DVLA on the 16th August, contacted them 4 weeks later and they said that the case had only been opened the day before, then at the 9 week point i contacted them again and they said that the checks were still ongoing, not sure what checks as the previous owner hadn't been contacted, then last week i contacted them again and they said should get the new V5 within 3-5 working days, that's tomorrow, so i wont hold my breath, will be 12 weeks on Friday,
Luckily it's not my only car or i would be screwed, not sure why in this situation you can't be issued with a temp document number to tax it, then once the real V5 is sorted it gets swapped over, can't be that hard to do, could use a similar system for swapping private/original plates over before and after sale, would save a fortune in printing and postage,
Renault 4 GT Turbo, Series 2 RS Turbo, 90 sport 2.3 20v 5 pot, Subaru Legacy GTB, several A4 S-Line 170's 3.0 tdi Le Mans, 2 x B5 S4, 2003 C5 RS6 in Daytona- 8 pots, 4 Rings!!! :blackrs4:

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Shoppinit
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Re: Cam phase timing question

Post by Shoppinit » Wed Nov 06, 2024 1:39 pm

What a shitshow. It's always such a nightmare dealing with the DVLA.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Gregstv
3rd Gear
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Re: Cam phase timing question

Post by Gregstv » Thu Nov 07, 2024 8:23 am

They make adjustable cam cogs for the RS4. Has anyone tried these? They would make fine tuning much easier. Or as usual am I talking out my but?

Varks
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Re: Cam phase timing question

Post by Varks » Mon Dec 02, 2024 4:25 pm

I have my V5C and the car is now legal, so i will get out and do some log runs, i will see what i get and hopefully get to the bottom of it, :thumbs:
Renault 4 GT Turbo, Series 2 RS Turbo, 90 sport 2.3 20v 5 pot, Subaru Legacy GTB, several A4 S-Line 170's 3.0 tdi Le Mans, 2 x B5 S4, 2003 C5 RS6 in Daytona- 8 pots, 4 Rings!!! :blackrs4:

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