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Discussion Starter · #1 ·
I have tried to no avail to figure this one out and i know that there are quite a few smarter folks out there than me. Question to all those with tuned ECUs. I have the Evolve/Powerchip and while i feel a real nice boost down low and surprisingl(compared to some of the others) good boost between 4k-5k. However, Frequently i get a lag between 3.5-3.7k. It feels like the car is pausing to take a breath before the sprint to redline. Any suggestions? Any pointers on were to get my dealer to start? They are supportive of my need for speed.
 

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Discussion Starter · #3 ·
it was flashed from the dealer in late feb. I have contacted Evolve. waiting on their best guess and looking to see if some of the smart guys here have any solution or if any similiar issue exists.
 

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Re: ECU chipped, power weak at ~3600rpm (PornSStar)

is your car a manual or auto?<p>if its auto, i know with mine sometimes in 3rd gear when you WOT, the RPMs will rise then drop a little as the box locks up then it gets going properly.<p>
 

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Discussion Starter · #6 ·
Well I may get fragged for "bumping", but i know due to all the smart talk about the turbo designs and the individuals who have gotten custon ECU work done that someone must have a good answer. I think that i am having issues with the MAF or F:A at certain RPM. I am wondering what there is i can due to diagnose and how to fix it (cheaply). <p>Thanks and sorry for the bump
 

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If you want to check A/F ratio get a wideband or put the car on the dyno. Get the sniffer as close as possible to avoid inaccurate readings.
 

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Re: (PornSStar)

as someone said, get a dyno done and plot against your AFRs. <p>if your MAF is spoilt, then that can just be checked by your dealer or any workshop. are you using any oil based panel filters?
 

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Is it possible you have a bad tank of gas? If you haven't tried it, an easy experiment would be to get a tankful of 93 from a different station.
 

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Re: ECU chipped, power weak at ~3600rpm (PornSStar)

Is it possible that this could be related to the VVT? <br>I had a v6 Contour and at about that point I'd feel the car start to pull harder. The Contour had two different length intake runners. It would switch from the low rpm runner to the hi rpm runner at 3500 rpm. I have no idea how Volvo's VVT works but if it's using two different cam profiles and it switches from one to the other at around 3500 rpm it would be something to consider. Just a thought.
 

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Discussion Starter · #11 ·
Thanks guys, now i feel like i am getting somewhere.<p>quick- nearest dyno is 4 hours away....soo what is the wideband? Talking about a plug n play similiar to the belltronics on IPD? Any suggestions on model?<p>Mistral if I am having a MAF problem would i feel the anti surge? Would it be centered around a specific RPM?<p>Crashy- I use a few different stations always use 93. Should i try 94 or octane boost? Could be pulling timing for that brief instant?<p>Black- I think i know where you are coming from, but i am getting an anti-surge. it would seem that I would get a boost or pull not a slow or drag.
 

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Check into an FJO or Techedge wideband -- then you can measure the A/F ratio on the street and determine if you're correct.
 

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Re: (PornSStar)

When accelerating slowly, I actually feel it dip around 3K. But when accelerating it aggressively, I don't get it. This is with a stock ECU program on a manual T5. I haven't flashed it, yet.
 

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Re: ECU chipped, power weak at ~3600rpm (v50t5black)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>v50t5black</b> »</i></TD></TR><TR><TD CLASS="quote">I have no idea how Volvo's VVT works but if it's using two different cam profiles and it switches from one to the other at around 3500 rpm it would be something to consider.</TD></TR></TABLE><p>VVT = Variable Valve Timing, it can change profiles and/or timing on some cars. Volvo's is called CVVT in fact (C for Continously) which doesn't change profile (just timing) and does not have a kick-in point - in other words, it's... continuous. The T5 engine has CVVT on both intake and exhaust cams, the 2.4i has it only on the intake.<p>CVVT is an important part of the low-end torque characteristics, while enabling wide-range performance. However, ignition timing and (on the T5) boost are important too. The air/fuel mixture is really not an issue at 3500rpm, or it shouldn't be. The ECU will attempt to keep the optimal and pollution-compliant setting until it is forced to alter it due to engine knock, etc. This generally happens only at higher rpms (4000-5000 and up).<p>Some real-time a/f data would be interesting of course, but really, what would one do with the data? The ratio isn't adjustable - if you try, the ECU will spank you and pull back to its designed levels. Yes, it's that smart. Really, the best thing you can do is alter the software - i.e. tune it.<p>As for dips in the powerband (3000 stock, 3600 Evolve, etc), these are typical and under light load, really don't indicate a problem. Unless they're really noticable, in which case they may indicate a glitch in the maps.<p>If they do it under heavy loads however, they're more indicative of (usually) overaggressive map engineering. For example, if the map calls for maximum boost at all times, this can lead to early knocking. At that point, the knock suppression part of the ECU is fighting the boost application, and guess what happens.<p>The best ECU tuning is achieved when all conditions are taken into account over a wide range. This is, understandably, a difficult proposition. Which is why you want the best engineering going in on the front. I'm not saying one or another tuner's program is defective, just that there are different aproaches and you can't tell by looking at the box.<p>That said, if you have an issue with a "hole" in the power curve, or a drivability issue etc, you need a tuner who can work with you after the sale. I'll be very interested in how this is resolved by the vendor...<p>Tom.
 

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Re: ECU chipped, power weak at ~3600rpm (PornSStar)

something else i just recalled. if im not mistaken, 3500 rpm or thereabouts is when the ECU goes from closed loop to open loop...<p>as for the MAF, ive never had a MAF problem before, but it shouldnt be a problem to get it checked out by your dealer. but if you are running stock filter, it shouldnt be any issue.
 

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Re: ECU chipped, power weak at ~3600rpm (tmtalpey)

We used to have that with the R's.<br>We thought of everything, the CVVT, VVT, etc.<br>it was the FACTORY ECU map that was faulty and Volvo came up with the new flash about Jan 04 and solved all the hesitation and surging problems <br>The ipd ECU just exasserbated the problem
 

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Re: ECU chipped, power weak at ~3600rpm (JRL)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Mistral</b> »</i></TD></TR><TR><TD CLASS="quote">3500 rpm or thereabouts is when the ECU goes from closed loop to open loop...</TD></TR></TABLE><br>That'd be an interesting reference, if you can find it again. It doesn't sound quite right to me that the car would be completely open-loop for anything above 3500. That's an awfully wide band.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>JRL</b> »</i></TD></TR><TR><TD CLASS="quote">with the R's...it was the FACTORY ECU map that was faulty and Volvo came up with the new flash</TD></TR></TABLE><br>So I agree that the map is quite likely the issue, but a) I'm sure Volvo learned from its mistake b) I don't feel any deep holes like the OP describes and c) the tuners all override those maps, so if there is an issue it belongs to the last company to touch the map, no?<p>Tom.
 

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Re: ECU chipped, power weak at ~3600rpm (tmtalpey)

The R problem was a lean condition.
 

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Discussion Starter · #19 ·
Welll guys thats why i brought the problem here. Some really good insight. I am runnning a K&N drop in so that is why i thought I might be having MAF problems. It will be interesting to see what Evolve and/or Powerchip can come up with. I pretty optimistic about the thread just posted about pulling the AWD fuse( there is no AWD dyno for 250 miles) I will start there and see what i working with. On a side note i am experiencing the hole under load. i will start poking into this shortly. Please keep the suggestions coming.
 
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