AudiWorld Forums: Same basic programing dude on an A6, but yes I have driven several S4s, not that it is relevant.

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Same basic programing dude on an A6, but yes I have driven several S4s, not that it is relevant.

Posted by: Singletrack on 2003-06-30 03:40:38
Account #: 25380

In Reply to: have you driven an S4 dude? keep your car at 4K rpm and floor it - notice the boost spike? posted by K04madness on 2003-06-29 19:44:35

Spikes happen on shifts, not flooring it from 4000 RPM.

If you are spiking from a 4k floor, then there would be something else to look at.

If you do some logging you will clearly see this, a boost gauge is not conclusive IMO. I'm not saying everyone has spikes (although I a lot of software/downpipe or even software/exhaust combos will cause it) but if you do it happens on shifting.

Example

Floor it to 6000RPM,
shift
back on WOT - spikes to 10PSI, back down to 9PSI
shift
back on WOT - spikes to 10PSI, back down to 9PSI
etc. etc.

-st

2008(9?) S5 - ordered 3/29/08
2004 Subaru Impreza WRX STi
2000 A6 2.7T - Sold

"On the run from Johnny Law; ain't no trip to Cleveland."

Thread:

So how many of you are using a MBC or EBC in your S4? Did you know how well it really works? - Innovator 2003-06-29 17:26:27 (6281 views)

Although on K03s the wastegate is left shut after 5500rpm ;-) - DarinS4Turbo 2003-06-29 19:13:20 (1505 views)

You need to keep it to an amount that the turbos can sustain. - Innovator 2003-06-29 19:17:45 (951 views)

Well, if you set it to < 1 bar to prevent the above scenario, you lose alot of low/end power - DarinS4Turbo 2003-06-29 19:24:40 (810 views)

This is true. A very good point, but 1 bar is plenty for a KO3 IMO. - Innovator 2003-06-29 19:31:40 (953 views)

Yeah, I do like the spool-up quickness and spike prevention of the MBC - DarinS4Turbo 2003-06-29 20:13:12 (689 views)

Geddy Profec B Is The Way 2 Go In EBCs - Y2K_S4_Blown Turbos 2003-06-29 20:10:45 (1148 views)

Is that a dual or single solenoid? - Innovator 2003-06-29 20:12:48 (616 views)

Single solonoid. The Spec II will be available in dual solonoid later this year. - Nogaro Baller 2003-06-29 20:19:58 (631 views)

Or.. HKS EVC 5 ;) - Nogaro Baller 2003-06-29 19:33:23 (910 views)

Any of the ones that will allow the boost to be adjusted in RPM increments and gear load. - Innovator 2003-06-29 19:39:18 (653 views)

Sooo argumentative ;) - Nogaro Baller 2003-06-29 19:41:17 (470 views)

At least i don't dangle shit in front of people like an idiot :-) - Innovator 2003-06-29 19:55:29 (515 views)

What is there to dangle. - Nogaro Baller 2003-06-29 20:02:59 (569 views)

Haha....that is funny. - Singletrack 2003-06-30 03:33:11 (468 views)

His little winky . - Innovator 2003-06-29 20:08:52 (471 views)

lol - Nogaro Baller 2003-06-29 20:12:36 (420 views)

spikes? not all of us have spike issues - K04madness 2003-06-29 18:52:01 (792 views)

All of the software I've seen spikes. So will yours. - Innovator 2003-06-29 18:57:40 (494 views)

rick did you watch my video i posted? - K04madness 2003-06-29 19:02:16 (679 views)

No quicktime. Did you get your car back? - Innovator 2003-06-29 19:06:34 (431 views)

Spikes happen during shifts, not while on throttle. - Singletrack 2003-06-29 19:06:06 (519 views)

have you driven an S4 dude? keep your car at 4K rpm and floor it - notice the boost spike? - K04madness 2003-06-29 19:44:35 (586 views)

Same basic programing dude on an A6, but yes I have driven several S4s, not that it is relevant. - Singletrack 2003-06-30 03:40:38 (750 views)

Hmmm Mine doesnt :-D - Nogaro Baller 2003-06-29 19:53:55 (429 views)

Umm??? LOL - Nogaro Baller 2003-06-29 19:33:55 (491 views)

When you release then depress the throttle when you shift, the boost will spike until it stabilizes. - Innovator 2003-06-29 19:36:40 (490 views)

Understood, i misunderstood "SingleTrack"s post. - Nogaro Baller 2003-06-29 19:39:27 (486 views)

When you release then depress the throttle when you shift, the boost will spike until it stabilizes. - Innovator 2003-06-29 19:35:38 (431 views)

Yup, and a MBC in line will reduce them to almost nothing. - Innovator 2003-06-29 19:07:42 (636 views)

wouldnt it need to be on a parallel circuit to limit boost? - CharlieGSanD 2003-06-29 23:46:04 (618 views)

No, the MBC would go after the N75 if you kept the N75 in line. - Innovator 2003-06-30 05:39:11 (703 views)

have you done this, or is it just a theory? - CharlieGSanD 2003-06-30 08:41:16 (584 views)

I have done it. It works, no doubt. - Innovator 2003-06-30 18:06:23 (457 views)

hrmmm....... - CharlieGSanD 2003-06-30 18:12:19 (634 views)

I hate this cryptic bullsh!t...if you have good information share it. What do you expect beside - 2k2S4 :: Indukted 2003-06-29 18:17:16 (632 views)

Call me Eric Fletcher,........ LOL. - Innovator 2003-06-29 18:27:52 (594 views)

Here's some info. They work great on X, MTM, and APR. Seem to be a problem on Piggie's - FunkWeasel 2003-06-29 18:23:16 (714 views)

Oh yeah, don't go over 1.5bar! Throttle shuts. - FunkWeasel 2003-06-29 18:30:16 (542 views)

That won't be a problem without those nasty boost spikes. - Innovator 2003-06-29 18:33:48 (516 views)

what does 1.5 convert to in psi anyways? over 22 i am guessing - buffalonogaro 2003-06-30 00:04:30 (626 views)

21.755662 - Innovator 2003-06-30 05:36:54 (484 views)

I know, just making sure people don't go overboard with the control! - FunkWeasel 2003-06-29 19:03:06 (454 views)

I could imagine that invites other problems as well. =) - 2k2S4 :: Indukted 2003-06-29 18:32:33 (482 views)

Funky - get on AIM foo! - Nogaro Baller 2003-06-29 18:25:03 (451 views)

;-) sorry just heading out, I'll look for you when I get back. - FunkWeasel 2003-06-29 18:29:24 (414 views)

Shhhh!!! dont tell people!!! - Nogaro Baller 2003-06-29 18:24:29 (438 views)

hush troll - Nogaro Baller 2003-06-29 18:21:56 (487 views)

Maybe - Nogaro Baller 2003-06-29 18:10:01 (441 views)

So I assume you are running one right now? More.... - Kitch 2003-06-29 17:35:51 (544 views)

Re: So I assume you are running one right now? More.... - Innovator 2003-06-29 18:30:34 (679 views)

Here's a more elegant solution, sans Orchard Supply Hardware. ;) - Jason @ ND 2003-06-30 09:24:40 (816 views)

Looks cool, but does it work better than the Dawes? And how much is it? - Innovator 2003-06-30 18:07:42 (573 views)

But then the "dawesdevice" is a $7 pressure relief valve from McMaster-Carr - FunkWeasel 2003-06-30 18:14:51 (677 views)

Damn your right! It works perfectly though, and I only pay a fraction of the list price. - Innovator 2003-06-30 18:21:25 (471 views)

Already ordered 2 of them before all you guys flood them with orders. ;-) - FunkWeasel 2003-06-30 18:22:20 (462 views)

From Dawes or the other place? - Innovator 2003-06-30 18:25:54 (532 views)

Mcmaster. Dawes wants $40 for it, and I'm cheap. - FunkWeasel 2003-06-30 18:27:25 (441 views)

Does it still allow the ECU to taper boost at high rpm? - Kitch 2003-06-29 20:07:50 (474 views)

No, you would need a EBC for that. Most tuners are wringing them out anyway. Most, not all... - Innovator 2003-06-29 20:10:02 (588 views)

Agree, some people are trying that on K04s ;-) - DarinS4Turbo 2003-06-29 19:16:15 (437 views)

And already have them installed on K03's with various ECU's.. - Milpitas2.7T 2003-06-29 20:23:52 (585 views)

At least on X you can ignore the requested if you like, and it won't set any codes. - FunkWeasel 2003-06-29 19:03:53 (551 views)

Thats teh plan >8-D - Nogaro Baller 2003-06-29 19:19:10 (452 views)

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