Hesitates after H/C
#1
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So after my H/C install I have it dyno tuned and everything seems fine. But now I notice when I start the car after the first 30sec or so the car sputters and hesitates like it has no power...almost like a plug wire is bad. Then all is well and the car drives just great. I did put new plugs and wires on it during install.
I called the tuner and asked him and he said that was normal for a H/C car. It may be but I just wanted to get other opinions and check anything if needed. I've driven in other cammed cars and didn't feel this at all.
Thanks!
I called the tuner and asked him and he said that was normal for a H/C car. It may be but I just wanted to get other opinions and check anything if needed. I've driven in other cammed cars and didn't feel this at all.
Thanks!
#2
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Mine does it too when I first crank up and leave in the morning. But after like 1/2 a mile to the stop light it's fine and it's even worse in the winter, but I'd say it's probably normal because I replaced plugs and wires at the time of my H/C install
#3
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It is not normal.
I've said this a number of times but I'm going to repeat myself. A dyno tune isn't about driveability. It's about wide open throttle tuning and it is generally used as a tool to separate customers from large sums of money to provide a simple dyno sheet.
Driveability issues are solved by doing cold starts and setting those parameters and doing stop & go driving and logging the data to make adjustments.
A full proper tune takes time - lots of time.
I've said this a number of times but I'm going to repeat myself. A dyno tune isn't about driveability. It's about wide open throttle tuning and it is generally used as a tool to separate customers from large sums of money to provide a simple dyno sheet.
Driveability issues are solved by doing cold starts and setting those parameters and doing stop & go driving and logging the data to make adjustments.
A full proper tune takes time - lots of time.
#5
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Take your car to someone that 'KNOWS' how to tune properly. It is not normal, nor should or would a decent tuner even consider dribbling out that sort of BS.
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#8
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A dyno is a tuning tool, if someone had a car they raced on race fuel and also used it say as a weekend driver, they may have a twin tune set up in the computer so they could switch to pump fuel.
You don't have a street tune & a dyno tune.
#9
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In most instances the dyno is not used as a tuning tool, it is simply used to show a "before" snapshot and an "after" snapshot to impress the customer. That being said, there are a handful of guys around that will data log on the street under normal starting and driving conditions and make necessary adjustments to spark advance, VE, Maf freq, Throttle cracker/follower, etc., for optimum street driving and also put the car on a dyno to get WOT fueling and spark advance where it needs to be.
One or two WOT pulls are what a whole host of people mistakenly refer to as a dyno tune because it has been marketed as such by a bunch of posers.
One or two WOT pulls are what a whole host of people mistakenly refer to as a dyno tune because it has been marketed as such by a bunch of posers.
#13
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Do you even know what the hell your talking about? I can't even comprehend what on earths going through your mind about tuning a car, i sincerely suggest you do a search on tuning and or speak to others that have some idea.
A dyno is a tuning tool, if someone had a car they raced on race fuel and also used it say as a weekend driver, they may have a twin tune set up in the computer so they could switch to pump fuel.
You don't have a street tune & a dyno tune.
A dyno is a tuning tool, if someone had a car they raced on race fuel and also used it say as a weekend driver, they may have a twin tune set up in the computer so they could switch to pump fuel.
You don't have a street tune & a dyno tune.
btw i know exactly what i was trying to say and couldn't have said it better. a dyno tune is a dyno tune, then you tune it some more (tweak it) so it has good street manors as well, not just all out power tuning.
#14
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Uhhh...I can't imagine how much more they would charge me for a street tune also, $450 is enough. If they can't sort it out after a second trip back I'll start to get loud. I know several people who have had to go back to adjust certain things when it comes to dyno tuning and I have no problem with that. I just don't like the fact the dude said it was "normal".
It's a well known tuner around here who mainly deals in LSX cars, and I think they are a sponsor here.
It's a well known tuner around here who mainly deals in LSX cars, and I think they are a sponsor here.
#15
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well my car was tuned strictly on the dyno and runs 100% perfect cold hot rainy sunny doesnt matter it has perfect street manners and perfect throttle response and WOT response. my tuner is also a badass. the tuner is a huge part of how the car will run and behave that being said i suggest either looking at some of your parameters yourself or get a 2nd opinion from a good tuner or just go ahead and have it tuned somewhere else. i would.
#16
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The same terminology Down Under has very different meaning, eg. "Street Tune". He's referring to the usage context, while you're talking about the methodology.
"Two cultures separated by a common language."
And you might also have looked into part-throttle dyno tuning before you fully exposed your own ignorance. Too late.
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Guys even the best tuner is going to need hours to tune a car properly, from dialing in the ve table, the maf, timing tables, wot fueling/timing, idle fueling/timing, disabling torque managment, air conditioning tuning, anybody can get a car on the dyno and play with the pe table and timing table untill it makes power.
#18
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It is not normal to do that on cold starts
#19
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^^ Yeah...he said the cold start issue (dies on cold startup) he can definitely take care of. He just guessed on that because he was tuning a warm engine. I don't know much about tuning but the more I think about it the cold start issue and hesitation until the car warms up could be related.