BrntWS6

iTrader: (7)

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!

supersick99z

iTrader: (66)

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

kenp

iTrader: (9)

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.

Sprayed1998

iTrader: (10)

Do me a favor guys, next cold start watch your temp guage and see when it starts driving "normal", my money says its exactly at 140

ls1 1990 VN

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.

trans_am7935

iTrader: (15)

my tune from a well known LS tuner is gonna take 3-4 days, cause he does a street tune and a dyno tune. i am getting my tune for driveability and gas mileage, not max power

Sprayed1998

iTrader: (10)

Did you guys test the coolant temp vs driveability yet?

ls1 1990 VN

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.

kenp

iTrader: (9)

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.

Steve01SS

iTrader: (43)

Sounds like it's tune related. It depends on what temp is set in the PCM, but that is probably when the car goes into closed loop. So runs bad in open loop, then when it goes closed loop it runs ok.

BrntWS6

iTrader: (7)

Alright....thanks. It's gotta go in for cold start issues so maybe that will take care of the hesitation. I'm gonna press them on it again when I bring it back next week. For that kind of money it should run a little smoother.

Sprayed1998

iTrader: (10)

Ding ding ding we have a winner....steve01ss

trans_am7935

iTrader: (15)

uh, retard, a dyno tune is made for a full throttle run, and then the street driven tune is done after that to get good driveablility after that. if you only get a dyno tune, you could still have poor driveablility, and awesome acceleration. poor idle qualities yet great full throttle response. you need to to have both done, unless it is just a race car. so get your facts strait before you go and criticize others.

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.

BrntWS6

iTrader: (7)

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.

Canbarelygo

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.

crainholio

iTrader: (2)

You might have looked at where the guy is from before slinging the kindergarten names.

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.

Sprayed1998

iTrader: (10)

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.

eamador11

good move, a full dyno tune should also include driveability adjustments as well. He was supposed to also take it on the street and tune for it especially since you did major work like H/C.

It is not normal to do that on cold starts

BrntWS6

iTrader: (7)

^^ 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.

A.R. Shale Targa

iTrader: (2)

In trying to lighten the mood around here..... can we ALL agree that
eamador11 has one of THEE most awesome pictures of um..err.. a vette !!!