Since my car got tuned it has a lot more power but BUCKS..anyone else?

Hi all,

My car gained 20+rwhp since the last tune but bucks alot more...up to 2krpm ..sometimes a little over of and on. Is this because of the radical timing? Thanks.

cbarr300 said:

welll, I'm gonna jump in this and throw my .02 in. Someone feel free to dispute this.

When your tuner tuned your car....u gained a good bit of hp. Unfortunately....it seems that with our cars (well any car really), a gain in horsepower/torque causes a loss in drivability. Maybe the tuner didn't get a good tune for the bottom part of the maf curve

I know that one thing that can cause this bucking is having too much timing advance when the buck is happening. Another thing could be too much or not enough fuel.


Have you tried cleaning ur maf/iac/changing O2 sensors/etc...the usual suspects? Maybe you could check for codes. That can tell novels as to car problems

Click to expand...

Thanks for the input cbarr300. My car has a tendancy to run rich and he was able to bum the timing higher..it's probably 16* or so. It rockets n all gears now which is great. I doubt he mapped the timing lower in the under 2k rpm like you suggested though. My MAF is a new Lightening 90mm. IAC is new. o2 sensors are a year old. I am going to guess it is the timing but yes a diagnos would help. I have a switch to lower timing for the NO2 so I am going to turn it to the N02 postition and see if that fixes the prob. If so.. I guess I have my answer.

Thanks guys. :SNSign: I switched it over to the lower timing setting and it ran very "mannerly."

Sure Grady. On the tweecer - a resounding NO. I have to admit that I liked playing around with the BASIC settings BUT at the time - if I ran into real trouble, folks with that tweecer didn't want to give out answers readily. I don't know why. It's like they wanted you to suffer. With my job, I didn't have time to play around begging for answers. PLUS the computer chip never got a good seal on my computer even after following the precise instructions. This may depend on the condition of the computer connectoid. I wasn't about to buy another computer just for that.

Then I had that problem after the H/C/I of the car not running and I said %^&* it. No more playing around. It turned out to be a MAF programing issue problem AND a crushed fuel injector..those two problems led me on a freaking wild goose chase that nearly caused me to sell the car for parts.

A few things you folks can take from opinion and learn from my experience:

#1 Don't ever use MD Performance. (Kauffman Motorsports got 20 more rwhp out of my car than they did.) They charged me $1200.00 PLUS to tell me that my MAF sensor, even though it was mapped for 24# injectors had to be manually programmed! Now that I have experience, I now that that is one of the FIRST things they should have checked. In my opinion, the gouged me (for lack of a "better" word).

#2 Don't assume you are ever going to slap on a MAF made for 24# injectors and see you car run.

#3 Don't make too many changes to a car at one time. It makes for tougher diagnosis. I changed out the H/I (cam was already in), MAF, injectors and fuel pump all at once.

If I don't like the setting, I can take it back to kauffman and they will fix it. As it is, I am ok as long as I know nothing is wrong.

A tweecer is a "self tuning" computer chip. It costs around $550 for the version that you need to do it properly plus another $200 I think for the wide band 02 sensors.

I paid $300 for my chip and $200 for my professional DYNO tune and I am done with it. No tinkering toying or anything and I know it is all done right. If I don't like I setting, they fix it for free and I spend my time doing other stuff.

It all comes down to personal preference and how much aggravation you want to put up with.

Ok, I like to make the internet a great place for answers so as usual, follow up and conclusion.

Kauffman Motorsports was great as usual and added some fuel and took out a little timing under 2500 and when not in load. Car runs great - no charge. Thanks again to the guys at Kauffman's.

As for the rest of my day though it sucked. Maybe because it is the day after Thanksgiving and people have hangovers or something?

I personally officially hate Pennsylvania, not the people but the damn laws there. For one thing I hate having to freaking PAY to drive on the dam road. I never carry cash because it weighs me down and money is dirty anyway. So thats me , so anyway I get to the toll booth so I can pay to drive on their freaking road and I couldnt find any change in the car. I had to pull aside, fill out a form and mail the money in.

In the meantime one rude driver decided to take his bad turkey dinner out on me and sit behind me honking and shaking his head for me to get out of the way! He had plenty of room to go around but decided to go cromagna in front of his kid (what a loser, lol).

Then on the interstate, people were doing 90mph today for some reason. Well I got a ticket in PA a month ago and decided to stay in the right lane so what do some of the drivers do? They drive up behind me and have plenty of room to go around but instead they drive right up my a$$ AND THEN QUICK CUT TO THE LEFT LANE AND CUT IN FRONT. OOPS caps..

So I start filming them. It is funny how all the sudden they back waay of and become responsible drivers when you do that.

So on my way back I stop by the comunist..oops I mean toll booth and try to pay and she says "its already in the computer so you'll have to mail in the money." So I get in my car and go to pull out and the roads are so suck that I must have drove over a huge bump with a crack in the pavement that sounded like the bottom of my car ws detaching.

But there's other reasons I hate PA - their BS taxes, the "townships" like to report you to your insurance carrier when you get a ticket, they will pull you over for the most rediculous speeds like 7 mph over, car inspections required EVERY year and if your car has been modified - even just lowered an inch, they have a right to tell you to put it back to stock and YOU pay for it!..in my that state is cose to communisim.. End rant.

Wow! $9. Sheesh.