Poor Boost figures for a Stage 1 map - Requested Boost way too low - Now with logs

[gex18]

The car is as follows :

2004 Cupra (Petrol)
Revo Stage 1
Forge TIP
Forge 007p (Green spring)
Open filter
Catback exhaust

These are the visual logs I made via the boost gauge tonight (I will get some actual vs requested logs on sunday hopefully)

1.4 bar @ 4k
1.3 bar @ 4.4k
0.9 bar @ 5k
0.8 bar @ 5.5k
0.6 bar @ 6k

These were runs from 4k in 5th gear - Will the standard downpipe be affecting the figures? Or is my car just

 

[Ric 2001]

Those reading seen fine.

Are you worried that its dropping boost further up the rev range you go?

Is it should do that as a K03 runs out of puff around 5k.

I have a full system and the only thing is that it will stay at 1.1 through the rev range and tails off to about 0.8 at 6k.

My map hasn't been tweaked for the downpipe though

 

[Ric 2001]

Also last year I posted that:

P-torque is around

Stage 1 was 1.2bar (17-18psi) and stage 2 is 1.5bar (22-23psi).

So IMHO your near maxing out your turbo so the only things that can change is the timing and other reletive mapping terms.

 

[gex18]

Those reading seen fine.

Are you worried that its dropping boost further up the rev range you go?

Is it should do that as a K03 runs out of puff around 5k.

I have a full system and the only thing is that it will stay at 1.1 through the rev range and tails off to about 0.8 at 6k.

My map hasn't been tweaked for the downpipe though

They do seem a touch low compared to pther peoples MK4 cupras, the guy who dynoed the car a month or so back also said if it only held another few PSI further up the rev range it would have gotten the 207 bhp it should get with its Revo stage 1 map, not the 195 bhp it got

Also last year I posted that:

P-torque is around

Stage 1 was 1.2bar (17-18psi) and stage 2 is 1.5bar (22-23psi).

So IMHO your near maxing out your turbo so the only things that can change is the timing and other reletive mapping terms.

Ah right, I guess its not the peak boost I was concerned with more the way it held boost? It seems to drop boost very quickly. Maybe replace the N75 valve?

 

[gex18]

I fitted a new N75 valve today as the old one was looking very tatty - and it was another potential problem to eliminate, but again no change to the way it holds boost - its still at 0.9 bar at 5k

What else do people suggest I change? Downpipe? Car?

 

[evo2345]

try using the sps switch and increase the boost up and timing slightly, the std setting on revo is boost 5 timing 6 i think? so maybe try knocking the boost up to 6

 

[gex18]

Re: Poor Boost figures for a Stage 1 map?

Well I ordered the Revo SPS and it arrived, and was used yesterday.

We initally acquired the settings off the ECU which were as follows :

Boost - 9
Timing - 5
Fuel - 2

The reccomended default performance map was uploaded, and there again no changes were noticed.

It still is only on 1.0 / 0.9 bar (14 - 13 psi) by 5k, whereas (looking at the VAGCOM logs on the SPS PDF file) it should still be seeing 1.2 bar by 5 - 5.5k

 

[gex18]

Re: Poor Boost figures for a Stage 1 map?

Anyone? Is it more likely to be a software as opposed to a mechanical issue?

 

[ibizacupra]

Re: Poor Boost figures for a Stage 1 map?

post logs of 115, and 002 please

 

[gex18]

I managed to get a log of 115 block off an SCN member this evening and am just awaiting him sending me the logs. It seems that actual never quite meets requested boost, at any rpm range although its not massively far out - any suggestions? Also its decatted but the lamba sensor error has to be cleared every time - will this fault code cause any alteration in A/F ratios?

Also on a sidenote - The turbo is quite noisy, a loud whistle is apparent when spooling up, unsure whether this is important but thought it best to state.

Cheers

Anthony

 

[gex18]

Heres a Requested Vs Actual log done last night (CHeers Bertrum)

There seems to be a lot of disparity between what the ECUs requesting and what the turbos delivering? Any ideas?

RPM Req Actual

2120 2110.0 1500.0
2200 2130.0 1570.0
2240 2150.0 1640.0
2320 2180.0 1710.0
2360 2220.0 1760.0
2440 2240.0 1820.0
2520 2270.0 1880.0
2600 2250.0 1940.0
2680 2270.0 1990.0
2760 2270.0 2040.0
2840 2270.0 2120.0
2920 2260.0 2170.0
3000 2250.0 2230.0
3080 2230.0 2260.0
3200 2200.0 2330.0
3280 2200.0 2290.0
3360 2200.0 2220.0
3440 2180.0 2160.0
3560 2180.0 2130.0
3640 2180.0 2140.0
3720 2170.0 2140.0
3800 2180.0 2110.0
3880 2150.0 2110.0
3960 2170.0 2100.0
4040 2160.0 2130.0
4120 2140.0 2100.0
4200 2120.0 2050.0
4320 2110.0 2070.0
4360 2090.0 2070.0
4440 2080.0 2010.0
4520 2070.0 2020.0
4600 2060.0 2010.0
4680 2030.0 1950.0
4760, 2010.0 1960.0
4800 1980.0 1920.0
4880 1960.0 1900.0
4920, 1930.0 1900.0
5000, 1910.0 1860.0
5080 1900.0 1850.0
5120 1900.0 1840.0
5160 1890.0 1800.0
5240 1880.0 1810.0
5280 1870.0 1800.0
5360 1860.0 1750.0
5400 1850.0 1770.0
5440 1840.0 1750.0
5520 1830.0 1710.0
5560 1830.0 1750.0
5600 1820.0 1730.0
5640 1820.0 1720.0
5680 1810.0 1700.0
5720 1810.0 1670.0
5760 1810.0 1670.0
5800 1800.0 1650.0
5840 1800.0 1690.0
5880 1800.0 1650.0
5920 1800.0 1670.0
5960 1790.0 1640.0
6000 1790.0 1650.0
6040 1780.0 1670.0
6080 1770.0 1670.0
6080 1770.0 1640.0
6120 1760.0 1630.0
6160 1760.0 1590.0
6200 1760.0 1610.0
6200 1760.0 1610.0
6240 1750.0 1600.0
6280 1750.0 1620.0
6280 1750.0 1620.0
6320 1750.0 1610.0
6320 1740.0 1610.0
6360 1740.0 1610.0
6400 1740.0 1620.0
6400 1740.0 1600.0
6440 1730.0 1570.0
6440 1730.0 1600.0
6480 1720.0 1580.0
6520 1720.0 1600.0
6520 1720.0 1610.0
6560 1720.0 1620.0
6560 1720.0 1610.0
6600 1710.0 1580.0
6600 1710.0 1570.0

 

[ibizacupra]

why is it requesting 0nly 0.7/0.8bar up top?

I did ask for 002 and 115 (meaning aty the same time...

if logging again, 002,115,118 @ same time

 

[gex18]

I'm unsure why its only requesting that - we did however back off top end due to traffic etc, so that maybe the cause of the disparity?

What are blocks 002 / 118 measuring out of interest? I'll try and get them logged asap.

Cheers

Anthony

 

[gex18]

Just to bump this up, looking at the boost requested by the ECU at 5k it works out to roughly 0.89 bar - which is about spot on what the boost gauge reads.

So if the ECU isn't requesting what it should, what could potentially be the problem?

Heres a graph of the above req vs actual log :

http://i303.photobucket.com/albums/nn133/dannyc87/actualvsrequestedscn.jpg

 

[gex18]

I will not be able to get fresh VAGcom logs for blocks 020, 115 and 118 until next week at the earliest now - in the meantime any ideas as to why the ECU is requesting low boost @ 5k and over? What would cause it to be pulled back? Timing? Heat? Faulty Components - if so any ideas which?


Many thanks

Anthony

 

[gex18]

Also as my car has had the N249 bypass done, if this was done incorrectly could it be holding it back? Here is a photo of the engine bay (not that it helps) :

 

[R1ch85]

It looks to me like you have removed the secondary air injection, but not blanked off the hole left. This may be causing an issue, although I don't know if it relates to what your problem is. Forge do a SAI blank plate which goes on the side of the engine block, or you can make your own.

 

[Ferryman]

Have you removed N249?
Also breather hose is not connected to the valve?

 

[gex18]

It looks to me like you have removed the secondary air injection, but not blanked off the hole left. This may be causing an issue, although I don't know if it relates to what your problem is. Forge do a SAI blank plate which goes on the side of the engine block, or you can make your own.

Can't you run is as is seen in the photo then? I have the blanking plate, thinking it just replaced the 'top' section, but it doesn't as you say, it attaches to the side of the block which is a big job!

Have you removed N249?
Also breather hose is not connected to the valve?

Which breather hose? Yeah a friend removed the N249 and I can trust he does a good job

 

[R1ch85]

Can't you run is as is seen in the photo then? I have the blanking plate, thinking it just replaced the 'top' section, but it doesn't as you say, it attaches to the side of the block which is a big job!

Its hardly a big job lol. There's 3 bolts that hold the bit to the engine block, and the blank plate is 2 bolts in its place. You'll have to remove the filter for easier access, but thats not exactly tricky The only issue is that one of the bolts is hard to remove as the more it unscrews, the tighter it presses against another coolant pipe (i think), but persevere and you'll get there, I did

I wouldn't have thought it does your car any good running like that to be honest. If it did, then Forge wouldn't sell blank plates for it