Heres my dyno !! I need to know wtf is goin asap please!!!

[euroracer325i]

i have a 92 325i rcently had the motor rebuilt meaning the block was bored and honed out so the pistons are a bit bigger by a few mm, i have a intake, bored out throttle body, custom headers, ss racing rasinator=no cats, ss cat back exhuast and a chip from bav auto, i am not boosted but can someone please help and let me know whats goin on with my car?? only in 3rd gear my rpms start acting funny and starts bogging and hesitating at 4500 and then goes to normal, ny car doesnt feel like the way i forst had it when i got it out of the shop, i have replaced my sprark plugs 4 times already in 5 months and everytime i change them i seem to find at least 1 spark plug that has a melted tip on it?? i dont know what to do anymore or know whats goin on with my car so any help would be great.Thank you

[euroracer325i]

i did a total of 3 runs..this is what it came out like

[euroracer325i]

i am still running with stock injectors and fuel pressure regulator..my chip is just a basic chip

[98328I]

melted tip, 1 cylinder bank is running too lean... those are pretty low numbers bro for a 325, i think you have some probs... i would go over that fuel system..

[euroracer325i]

i took out my stock chip and its still running the same way...i know i am runnin a hiugher compression then stock specs due to the fact that when the motor was rebuilt the head was shaven a few mm also..so should i go with some bigger injectors and put my adjustable fuel pressure regulator on?

[themadhatter]

i have a 92 325i rcently had the motor rebuilt meaning the block was bored and honed out so the pistons are a bit bigger by a few mm,

what type of pistons were installed or was it some how resleaved?


i have a intake, bored out throttle body, custom headers, ss racing rasinator=no cats, ss cat back exhuast

this isn't gonna cause your problems so I think we can exclude those from the equation.


and a chip from bav auto

how long have you had the chip for and are these known to go bad?


i am not boosted but can someone please help and let me know whats goin on with my car?? only in 3rd gear my rpms start acting funny and starts bogging and hesitating at 4500 and then goes to normal, ny car doesnt feel like the way i forst had it when i got it out of the shop, i have replaced my sprark plugs 4 times already in 5 months and everytime i change them i seem to find at least 1 spark plug that has a melted tip on it?? i dont know what to do anymore or know whats goin on with my car so any help would be great.Thank you


which piston is melting your plugs or is it random each time? are you using the original cranks sensor on the car? your 3rd gear issue sounds like something I had with my '99 ML430. bad crank sensor made the car bog down when I would floor it or cruise over 100 mph (Africa, no speed limits :D).

as 98328i mentioned, start going over your fuel system. your melted plug issue isn't healthy, you're probably getting too much heat in there from a fuel starvation issue. for giggles, try swapping your plugs around and see if the problem changes to a different cylinder (bad injector). if it was a spark/ignition issue, you'd have a dirty (black) plug or it would actually be wet to the touch from fuel.

-Ron

[vodomagoo]

who built the engine

[themadhatter]

who built the engine
with so many posts by Vodo today, I'm guessing you've either lost your license or rediscovered the PC sitting in your house. ;)

long time no post bud - good to have you around.

[RAiMA]

i have a 92 325i rcently had the motor rebuilt meaning the block was bored and honed out so the pistons are a bit bigger by a few mm

What's the new bore size?

To give you an idea how much of a difference it can make, if the bore and piston was increased by just 2mm, the capacity of the engine would have increased from 2493cc to 2613cc. That's quite a big difference in displacement. The injectors, timing and fuel curves will need to be adjusted.

[tcarswell]

Ahh Enis I was sorry to hear this today on the phone. What I would do is start working with your fuel it looks like its lean. Or some bad fuel starvation. either way let me know you will get it straightened out and start laying down some awesome numbers in no time.

[euroracer325i]

yes they did bore it out alot..as a matter of fact it is atleast 2mm on the pistons, i believe he replaced the crank sensor but im not sure and im not getting and check engine lights coming up, when it was on the dyno i didnt hear any pinging or knocking. Its somewhat random on buring the spark plugs really bad but when i did pull out spark plug #5 it was a bit wet and smelt like fuel most of the spark plugs were burning fine maybe 1 would be melted..well im gonna try m3 injectors, i have an adjustable fuel pressure regulator, and some denso iridium spark plugs but go with a step colder..thanx for all the info around here i just needed some imput on other peoples thoughts, ill porbably contact aa for a custom chip and the chip i had in my car for about 1 year and its from bav auto

[RAiMA]

It's best if you find out the exact bore size, so the engine capacity size can be reset to the correct size in the computer. I wouldn't be suprised if the computer still thinks the engine is a 2493cc inline 6.

Hence with all that extra displacement and compressed air, the engine is running lean if it's running in open loop.

[Gizmo330iT]

Getting a custom chip will sort out the fuelling problems so I don't think you will have to go to bigger M3 injectors. Why did you have the motor rebuilt?

[CRISTIAN]

Increasing the compression rate will also rise the burn efficiency... so LEAN FOR SURE... Another think... no cats go also to LEAN afr.
How much CR do you have? Do you know exactly the mm they shaved from the head so we can make the calculations ? After 1:11 CR you will need a different timing map... a normal chip is not good. What pistons did you use? Maybe are concave and you don't have higher CR... :confused:

Why don't you install an afr wideband sensor and gauge... it's so simple... and you will know for sure if you need more fuel or not.

You see... are so much X and Y here... that we can help without exact numbers.

[stimpee]

You, and everyone else, are just guessing based on your comments and dyno sheet. What you NEED to do is get some AFR readings with a wideband pre-cat and actually SEE what your AFR is, not guess. Otherwise, how will you evaluate the changes you plan to make? You could really mess things up just going around and "willy nilly" changing injectors, fuel pressure, etc without a plan and some basic (and now, cheap) instrumentation...

Also, I would check your coils. If you have an early engine with early coils, and you are seeing a wet plug sometimes, probably indicative of a misfire, you could have one or more of the commonly FUBAR bad ignition coils.

[euroracer325i]

well when i went to dyno the company has a new programm for A/F ratio being setup so i couldnt get any numbers, but im probably gonna head to Turbotrix and have them do it for me, well i dont know exact specs but i know my compression is bumped up due to the fact that the head was shaved dowb a bit so im def not running a 10.5 but hopefylly this weekend i can get my A/F numbers and then work from there, but i know im def starving on fuel tho , the lines on my dyno are not steady at all and they are dipping up and down

[vodomagoo]

with so many posts by Vodo today, I'm guessing you've either lost your license or rediscovered the PC sitting in your house. ;)

long time no post bud - good to have you around.


heh ive been hiding in the track forum and over on some jeep boards trying to build up my new toy my car is gonna change entirely within the next few weeks too.
Again did you have a bmw engine builder build it or some random shop? if it was a known builder then contact them they will have a fix for it. it def does sound lean but cant say that since theres no data

[tcarswell]

heh ive been hiding in the track forum and over on some jeep boards trying to build up my new toy my car is gonna change entirely within the next few weeks too.
Again did you have a bmw engine builder build it or some random shop? if it was a known builder then contact them they will have a fix for it. it def does sound lean but cant say that since theres no data

The shop he had it done at went out of business and shut down :(

[vodomagoo]

that doesnt make me confident, mabey try the a/f graph and if that doesnt show anything wrong call fields or another good builder up and have them take a look at the build. mabey something is wrong from the inside

[blueboost]

dude thats sweet, you went to mothers in Lodi, Jersey....very surpricing that your car got bad numbers there, my buddys dyno'd his car there and his numbers was always questione'd.....

[euroracer325i]

lol yeah theyre pretty cool people over there..85 bucks for 1 hour and you can do as manyt pulls as you want, but there A/F programm isnt setup yet since they got a new programm now, but yeah i have low numbers cuzz my damn car is running like shit, its not puttin the power out like it should be, becuase i remember when i first got on it from 1st-3rd gear i felt the tires wanting to break loose literally, i mean it felt like i had a turbo in the car but now its nowhere near that same power and by the way i have automatic

[blueboost]

Increasing the compression rate will also rise the burn efficiency... so LEAN FOR SURE... Another think... no cats go also to LEAN afr.
How much CR do you have? Do you know exactly the mm they shaved from the head so we can make the calculations ? After 1:11 CR you will need a different timing map... a normal chip is not good. What pistons did you use? Maybe are concave and you don't have higher CR... :confused:

Why don't you install an afr wideband sensor and gauge... it's so simple... and you will know for sure if you need more fuel or not.

You see... are so much X and Y here... that we can help without exact numbers.
Cristian how you doing buddy :) , always giving good advice,
how did your SC S52usb32 turn out with the 10.5lb of boost.
maybe you need turbo my good friend.....=)
EDIT:
p.s. i just read your sig and saw 11psi :stickoutt thats crazy.
congrats.....

[blueboost]

lol yeah theyre pretty cool people over there..85 bucks for 1 hour and you can do as manyt pulls as you want, but there A/F programm isnt setup yet since they got a new programm now, but yeah i have low numbers cuzz my damn car is running like shit, its not puttin the power out like it should be, becuase i remember when i first got on it from 1st-3rd gear i felt the tires wanting to break loose literally, i mean it felt like i had a turbo in the car but now its nowhere near that same power and by the way i have automatic
i remember when i used to be there everyday when FELIX used to tune/work there......let me dig a video for you....i love the dyno at mothers, FELIX always had everything working, they mad lazy and shit =\
550+rwhp TwinTurbo S52 M3 @ Mothers (http://www.bigblueboost.com/Day2%20551rwhpLS.mpg)

[themadhatter]

I haven't heard good things about the skills for the people running the dyno at Mothers...am I to believe this is true now?

a twin turbo M3? :eek:

[euroracer325i]

well if you want to test and tune your bmw i would suggest bringing it to turbotrix since theyre evo just made it big in the magazines and runs 9's all day!! www.turbotrix.com , but mothers is cool place to get dyno at