LCR Requested vs Actual

[Feel]

Found my (2nd?) leak - small pipe off the charge pipe to the bottom of the N75 split wide open. Looking at it I've over tightened the Jubilee which has started a split, which has propagated up the pipe (cheap jubilee as well).

Zee - yours does hold the boost well, I think the best I've seen at 5,500 is 1.22bar then down to 1 bar at the redline... I'll add it to the graph later.

Anyone with Stage 2 and no front mount got any?

 

[Ruddmeister]

Phil

Keep checking those pipes as I said at Awesome mine was the brake servo?, end of the intake manifold next to the top intercooler pipe (and both ends were split)

Good luck tracking them down


Steve

 

[Wilko]

Found my (2nd?) leak - small pipe off the charge pipe to the bottom of the N75 split wide open. Looking at it I've over tightened the Jubilee which has started a split, which has propagated up the pipe (cheap jubilee as well).

Zee - yours does hold the boost well, I think the best I've seen at 5,500 is 1.22bar then down to 1 bar at the redline... I'll add it to the graph later.

Anyone with Stage 2 and no front mount got any?

It sounds like you've found the culprit Phil.
Get a piece of silicon hose to replace it. The heat above the turbo, and high pressures take their toll.

Z's looks good. I'd be interested to see a block 003 Z

 

[ZBOYD]

If i get chance this weekend, i'll see what I can do.

 

[Feel]

It sounds like you've found the culprit Phil.
Get a piece of silicon hose to replace it. The heat above the turbo, and high pressures take their toll.

Z's looks good. I'd be interested to see a block 003 Z

A bit of LPG pipe will have to do for now

Must've been leaking for a while and slowly getting worse.

 

[Feel]

Zed's added to the graph (you might have to refresh the page?)

http://homepage.ntlworld.com/p.revill/ZBoyd.gif

 

[Feel]

Still not sure mine's right.

Anyone with Stage 1 Revo (and no exhaust) got any requested vs actual logs?

(BTW: Thanks JW)

 

[Wilko]

These are from a revod cupra R I logged.
3040 117.3 1820 1420
3320 141.4 2130 1770
3680 178.9 2460 2290
4040 191.7 2470 2540
4440 191.7 2440 2540
4800 191.7 2430 2430
5160 190.2 2380 2300
5240 188.7 2380 2280
5400 184.2 2360 2270
5480 186.5 2350 2220
5560 178.9 2330 2220
5720 175.2 2290 2190
5840 165.4 2260 2210
5960 178.2 2250 2100
6080 170.7 2240 2140
6160 162.4 2240 2160
6280 166.2 2240 2050
6360 162.4 2230 2050
6480 165.4 2230 2050
6560 161.7 2230 2000

And these are from an oetinger chipped one
1960 84.2 2010 1100
1960 98.5 2040 1290
1960 109 2060 1420
1960 114.3 2060 1500
2320 135.3 2150 1670
2720 178.2 2150 2220
3080 177.4 2180 2140
3480 183.5 2270 2230
3840 186.5 2250 2250
4280 184.2 2200 2240
4640 177.4 2120 2150
5000 170.7 2080 2050
5360 169.9 2060 2080
5720 170.7 2050 2050
6080 166.2 2000 2010
6400 157.1 1900 1970

I still think you might have a small leak. Check the pipe from the n75 to the actuator. Mine had a tiny leak, and it was surprising how much difference it made.
Also If you've fitted a TIP, check it hasn't slipped off the turbo inlet slightly. (another problem I've had)

Good luck

 

[Feel]

Thanks mate.

You know - I was thinking earlier that the only thing I've tinkered with and not checked was the turbo inlet end of the TIP...

 

[Simon L]

Not a LCR, but my Ibiza Cupra is not making the boost requested... any ideas...?



http://www.btinternet.com/~leonardbrianj/cupra/115-118-log.xls

Log i carried out tonight. Been remapped @ Star, N75J, Scorpion Cat-back exhaust, if that makes any difference.

 

[GaryM]

Why not ditch the N75J and replace with your stock valve?

 

[Simon L]

I had been running the N75C for a while, but the N75J looks to give more boost (on the gauge anyway).

Will swap them over and log the C tomorrow night.

 

[m0rk]

more boost isn't always ideal though....

plus the ecu isn't mapped to it

 

[Simon L]

Okay swapped over to the N75C and it was holding 0.9 bar at 6k in 4th.

The boost holds much better in 4th compared to 3rd. Any reason why that would be?

 

[Simon L]

As my N75 isn't maxing out, doesnt look like i have a boost leak does it?

What else would cause the actual to deviate from the requested?

 

[cordobabrendy]

leaks are exaggerated at higher revs when boost is on full. i had this on my cupra after revo showed it up bigtime!

 

[Simon L]

And here is the N75C log...

http://www.btinternet.com/~leonardbrianj/cupra/LOG-01-115-118-n75c.xls

This time the N75C is maxing out from 5600rpm onwards, and i hit limp mode just after with the error "Negative boost deviation".

Any ideas?

 

[GaryM]

You have an awful boost curve, your dip early on doesnt look right either.

 

[Feel]

I'm not used to those boost levels, but from what Wilko and Saul told me, your N75 isn't trying - shouldn't it be 95%-100% ?

 

[GaryM]

This is my N75 log, you can see it has the wastegate closed until actual overshoots requested then it controls it until the K03s starts to become inefficient and run out of steam. The N75 see's this and tries its best to bring the actual back to the requested (which is never going to happen).