To Shiv, a question
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Evolving Member
Joined: Mar 2004
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To Shiv, a question
Shiv-
I posted a question in evo general earlier that I think one person may have answered but I'm not sure. I thought I would ask you since you know the Evo ECU pretty good. Here's the thread
https://www.evolutionm.net/forums/sh...00#post1471700
But I'll just copy and paste it for you. Here's what I asked:
Do you know if this is indeed the source of the inconsistent acceleration of late. It indeed just got really cold where I am at, so that's why I thought this would be a poignant response. I really love my Evo and I would be worried if something happened to it (before I can get a stage 1+ 
) because I really do take good care of it
I posted a question in evo general earlier that I think one person may have answered but I'm not sure. I thought I would ask you since you know the Evo ECU pretty good. Here's the thread
https://www.evolutionm.net/forums/sh...00#post1471700
But I'll just copy and paste it for you. Here's what I asked:
Originally Posted by ezhangin
Ok, so I got these other rims on for snow tires, and I would say they weigh a pound or two more than the stock ones. Anyways, to get at what I want to ask, is that my Evo just is not being consistent when it comes to acceleration. Somtimes it will throw me back in my seat and sometimes it feels like something is holding it back. (I am talking about low end acceleration, not when the car begins to run out of steam at like 120 mph)
Would a new set of rims really hold the car back that much? The rims are ASA KA3s and are 17 by 7.5, and the tires are those Michellin Alpinas. I am wondering what could be causing this inconsistency and hesistation. Is it the temperature outside (freezing)? And today when I was making a turn a heard a few weird thump noises coming from near the driver side front wheel, maybe its just the suspension creaking cuz of the cold, I dunno.
I treat my Evo good, so that's why I'm wondering why it's acting up. Any ideas?
Side note - my car is 100% stock, no mods
Would a new set of rims really hold the car back that much? The rims are ASA KA3s and are 17 by 7.5, and the tires are those Michellin Alpinas. I am wondering what could be causing this inconsistency and hesistation. Is it the temperature outside (freezing)? And today when I was making a turn a heard a few weird thump noises coming from near the driver side front wheel, maybe its just the suspension creaking cuz of the cold, I dunno.
I treat my Evo good, so that's why I'm wondering why it's acting up. Any ideas?
Side note - my car is 100% stock, no mods
Originally Posted by sr20det91
Heavier rims could cause a a bit of a accereration decrease, but it would be consistent. Also, if you have a thicker sidewall on you tire it could increase the overall diameter and effectivly give you higher gearing, which would also hurt acceleration, but again it should be consistant.
I would say your problems have more to do with the temperature changing and your ECU compensating for it more than anything else. When it gets cold out turbo cars tend to boost spike more, so you ECU trys to cut boost back to target. Sometimes it pulls back more than needed so your car feels a little sluggish. It should eventually find the sweet spot and you will be good to go.
I would say your problems have more to do with the temperature changing and your ECU compensating for it more than anything else. When it gets cold out turbo cars tend to boost spike more, so you ECU trys to cut boost back to target. Sometimes it pulls back more than needed so your car feels a little sluggish. It should eventually find the sweet spot and you will be good to go.
) because I really do take good care of it
Do you have a boost gauge? I'd check to see what I'm boosting to, since this seems to be an intermittent problem. Have you checked to make sure you still have the little plastic fasteners in the air guide before the intake box? (could be getting sucked to the hood). Check your hose clamps to make sure you don't have a boost leak anywhere. What you describe is inconsistent acceleration, a variable; Tires are fixed. I doubt a moderate increase of a pound or two of unsprung weight would be even noticeable on the street. Either way, your tires don't really change run to run (not counting miniscule wear or minor temp differences), I'd say your problem lies elsewhere.