what boost pressure should i be getting?

[dave_ph]

Hi all

I installed my boost gauge last night, and took the car for a quick spin for 20mins and established the following:

when flooring it, boost builds upto 25psi before it kicks in
when flooring it in 3rd and 4th, boost held at 14psi
when flooring it in 6th (upto the point i had to stop due to speed (on my private road)) it held 20psi?

What figures should I be expecting. I have a stage 1 remap, and its never put decent figures out on the rolling road (last was 230bhp). Are these figures you would expect out of a stage1?

Cheers
Dave

 

[weerobocupra]

i have standard ibiza cupra and my boost holds 0.5 bar when floored in every gear
u might be gettin a small leak

 

[JamJay]

You should be gettin much more than 230bhp from a Stage 1, considering you have 222bhp as standard. Are you able to get it logged at all and see what readings the MAF is giving?

 

[dave_ph]

unfortunatly dont know anyone with vagcom in the area

 

[adam cupra 20vt]

It might be 230bhp at the wheels?

 

[BoomhaueR]

Rob and I have vagcom (freeware anyway) if you want to go for a run sometime?

Mine boosts to 25psi and holds around 20psi, eventually tailing off around 17/18psi I think. Wasn't really looking at the gauge when approaching redline

 

[JamJay]

Dyno's normally give flywheel figures, that's the only thing. EmDee has a similar issue to you and hasn't achieved much more than you but I don't know if he found the problem. Low BHP is consistant with MAF failure which unfortunately is a common fault. I am not saying that this is your cause but it's worth checking out. I for one know that my MAF is playing up and it needs replacing but then again I feel the cambelt and tyres are more urgent. I will replace it along with a better air filter in the New Year.

Do you have a laptop? You could download V-C 409.1 for free and buy a cheap £15 cable from ebay. You won't get all the features of course but it'll allow you to see MAF readings, at least then you can cross that one off.

 

[dave_ph]

unbelievably, both my laptops are shafted lol. ones got a dead graphics card, so i was using my older one and last week the hard disk died on it. more money!!! can use my work laptop.

Whats the best cable to get? I've heard theres different types

 

[JamJay]

You need the KEY interface cable although you can use the HEX/CAN cable also on later MK1 Leons. The HEX cable also works on the MK5/6 platform too.

Something like this should do it: http://cgi.ebay.co.uk/USB-VAG-COM-4...iagnostic_Tools_Equipment?hash=item56378218d7

But Boomhauer has kindly offered to help you out

As far as I understand, you need to take the car out and in 4th preferably go from 20 - 25mph (slow speed but not stalling) all the way up to redline with your foot flat to the floor. Then with the logs taken by V-C, you can see the airflow rate which I believe for a mapped LCR should be around 190 - 200g/s or with a good air filter, up to 210g/s or maybe more.

 

[dave_ph]

But Boomhauer has kindly offered to help you out

Glad you pointed that out, because I missed the reply in my haste!

Rob and I have vagcom (freeware anyway) if you want to go for a run sometime?

Mine boosts to 25psi and holds around 20psi, eventually tailing off around 17/18psi I think. Wasn't really looking at the gauge when approaching redline

If you dont mind mate that would be really helpful. Would be nice to see whats going on (or not as the case might be) with it

 

[JamJay]

Make sure you do it ASAP and update as I am really keen to see what's going on, especially if it's MAF related.

 

[dave_ph]

yea will do. will text ben to see when hes happy to do it

 

[andycupra]

what remap are you running?

many maps run higher levels of boost but which reduce as you get towards the upper end of the rev range.

also once map is known, is it one where you can adjust the settings, it may be on conservative settings boost wise.

 

[dave_ph]

its a 'celtic tuning' map. its not one which you can change the settings of

Cheers andy

 

[dave_ph]

for those interested, logs are up here:
http://www.seatcupra.net/forums/showthread.php?p=2709312&posted=1#post2709312

 

[slim20vt]

vagcom that might help me solve my low power dave? my 225bhp bam came out 218bhp thats with a stage 1 map?? boosting to 20 psi? and i have just changed my maf and n75 valve thanks to (nick) and also changed inter cooler hoses to tfs ones.... hopeing this will help solve the problem?

 

[dave_ph]

i expect the maf could make the biggest difference to yours. might be worth getting some logs similar to mine to see if anything is running out of place.

 

[JamJay]

Maybe we should get a National MAF failure meet going, swap them all around and see what happens then.

 

[dave_ph]

that doesnt sound like a half bad idea lol