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View Full Version : Boosting 20psi on APR 93???



SirDaft1
04-12-2007, 02:55 PM
Check my sig for the mods, but engine wise all I have is the APR 93 Chip and it is boosting at 20psi at 3500rpms on my stock K03 (sometimes spikes at 21-22 for a millasecond).
I know this isn't good... why the crap would it do this?

This might be related... when I swapped out my stock exhaust for the Borla, on the install i may have pinched a wire going to the MAF because it threw a CEL telling me LOW INPUT SIGNAL TO MAF and RUNNING RICH ON BANK 1. The guys at Renn-Art can't even figure out what it is. Would running some logs on a Vag-com help diagnose this?

I'm not wanting to purchase a new engine if this one blows.

AudiRacerS4
04-12-2007, 03:00 PM
thats perfectly fine to spike at 21psi. Shit I run my K04 at 28psi....

maxspeed
04-12-2007, 03:10 PM
dont worry about it, i run my k03 at 23 psi daily

Alan
04-12-2007, 03:11 PM
My K04 spikes 23 and holds 17.

AudiRacerS4
04-12-2007, 03:12 PM
spkiking to 21 is fine now if you were holding 21psi, well then I'd be worried

SirDaft1
04-12-2007, 03:29 PM
so spiking at 22psi and holding at 17 is ok for a stock K03?

1 ate T
04-12-2007, 03:36 PM
so spiking at 22psi and holding at 17 is ok for a stock K03?

Yes. Mine does that even with the fmic.

AudiRacerS4
04-12-2007, 03:43 PM
so spiking at 22psi and holding at 17 is ok for a stock K03?

yeah thats normal

mike-2ptzero
04-12-2007, 04:07 PM
so spiking at 22psi and holding at 17 is ok for a stock K03?

Yes it is ok. But you will see a big drop off of power right after the spike. My old K03 setup ran 24 and held that till the mid rpms.

1 ate T
04-12-2007, 04:08 PM
Yes it is ok. But you will see a big drop off of power right after the spike. My old K03 setup ran 24 and held that till the mid rpms.

[eek] that would be sick lol

maxspeed
04-12-2007, 04:18 PM
i can only hold 19 till 5000, than it drops RAPIDLY :(

mike-2ptzero
04-12-2007, 04:44 PM
i can only hold 19 till 5000, than it drops RAPIDLY :(

Yeah, the more boost you run the worse it gets since it makes it reach its max spin sooner. The K03 can only hold 15psi all the way to redline.

maxspeed
04-12-2007, 04:49 PM
i have like 13 psi at redline :(

Ewok_Fetus
04-12-2007, 05:01 PM
I have 9 at redline with GIAC X and no boost leaks!

maxspeed
04-12-2007, 05:32 PM
what DV?

Ewok_Fetus
04-12-2007, 05:58 PM
It was a 710N but now I went to an HKS SSQV and it holds the boost SO MUCH better but still drops to about 9 at redline... Actually it will drop to about 12 or so at 5k... My curve looks about like this...

2500-4500 is 20 psi
4500-4750 is 15 psi
4750-5000 is 12
5000+ 9-10

It drops very rapidly within about 1000 rpms... I have noticed that I have the infamous rattle upon WOT and decel which COULD be a bad wastegate but I am not about to throw parts at it just yet for that. All the other stuff that makes noise like that is out of the question. i.e. no exhaust leaks, cam chain tensioner, new injectors, oil changes on time... The noise is pretty much boost related.

UCFQuattroguy
04-12-2007, 06:53 PM
spikes aren't always a good thing. I only had a spike to 19psi and was causing HUGE timing pull because the N75 couldn't react quick enough to make a smooth boost curve until it started to taper. CAPS time dropped at least 3/10ths when I fixed the "overboost" problem

maxspeed
04-12-2007, 08:04 PM
n75's are for suckers [:p]

Tiluleshpingen
04-12-2007, 08:17 PM
My K04 spikes 23 and holds 17.

ok your having problems with your K04 u should hold more

Tiluleshpingen
04-12-2007, 08:21 PM
i can only hold 19 till 5000, than it drops RAPIDLY :(

i can only hold 8 at redline [mad]

Oricle
04-12-2007, 08:53 PM
You guys are boosting higher than my BT. I'm boosting to 20 and holding right at 20.

SirDaft1
04-12-2007, 09:43 PM
Yes it is ok. But you will see a big drop off of power right after the spike. My old K03 setup ran 24 and held that till the mid rpms.

you're exactly right. I'll spike at 21-22psi for a second and then it will taper to 17-18psi and it feels almost like the engine cuts fuel for a second cause its like oh sh** we are boosting too high

mike-2ptzero
04-13-2007, 07:35 AM
You guys are boosting higher than my BT. I'm boosting to 20 and holding right at 20.

But you are moving much more air at a lower boost level.