Avert Thine Eyes (OR: Andyman S/C Build Thread) ***FINISHED!!!***

[AndyMan]

potential NA problems... Not sure exactly where to start.

Here is a pic of the exhaust ports from the engine itself... Dan noticed this...



If one side of the engine is clean and the other is dirty ( like is suppose to be ) wouldn't this mean that the fuel isn't being used properly and causing one bank to use more fuel as compared too the other side that isn't using as much causing the lean issue.
.. i don't know maybe i have a bad fuel rail
I'll check again this weekend hopefully.


EDIT: actually now that i recall, if i am getting fine fuel pressure going into the engine, then it can't be fuel usage cause otherwise the fuel pressure would notice a change or spike even...

[brapple]

Originally Posted by AndyMan

potential NA problems... Not sure exactly where to start.

Here is a pic of the exhaust ports from the engine itself... Dan noticed this...



If one side of the engine is clean and the other is dirty ( like is suppose to be ) wouldn't this mean that the fuel isn't being used properly and causing one bank to use more fuel as compared too the other side that isn't using as much causing the lean issue.
.. i don't know maybe i have a bad fuel rail
I'll check again this weekend hopefully.

except both exhaust posts come from one cylinder ...


funny I have the same condition. one bank is running richer then the other ....

[BurritaSVT]

If this is the only cylinder doing this I am suspecting you have a leaky valve stem seal and you are burning some oil in that port. The burn can be hotter on one side but I highly doubt one port will get that much hotter than the other so I am suspecting the seals are leaky or you have a oil passing the rings on that side that would be far fetched to thiink it would not affect the other port too. Now you say the tune you recieved from the tuner there filed out your plugs in one week so maybe you flooded the cylinders so bad you washed the rings and maybe the misfire caused the one bank to run leaner meaning if you had one file plug and it did not burn the fuel at all the bank would read lean whenever raw fuel is not ignited it monitored as a lean situation instead of rich. In order to get rich you must have a burn or weak ignition not leacing alot of carbon and fuel deposit left-over . Now is there one cylinder port or spark plug you have that is different from the others? I thought this tuner tuned the car did he not check the A/F or short term fuel trims especially since you left with the car being done?

Brapple until he can get his car tuned I doubt he can go by the fuel triims yet since he is having MAF spiking issues and the pulsewidth on his injectors look like a heartbeat monitor......... when it is idling.

Snap some pics of your spark p-lugs with the spark plugs identified in the pic we can all look at them but realize this is a whole different problem we are facing here you need to get the engine checked out do the preliminary checks then just take the darn stock maf or 90mm maf and just add a filter to it and let the SC just spin for now till you get the new problem resolved and did Dan open the BOV to make it recirculate at idle or is it open at idle? Just pull the BOV off the car and run it and check to see if the MAF is still spiking or jumping. JOey

[gamiller]

Joey, it's the same for each cylinder along one bank of the engine. The right-hand port is dirtier than the left-hand port. This was discovered when Dan removed the headers, which was before another tuner was involved, before the supercharger was installed, before the 38# injectors were installed, and before the 90mm MAF was installed. In other words, the picture shows how things were running for the last year.

[BurritaSVT]

Originally Posted by gamiller

Joey, it's the same for each cylinder along one bank of the engine. The right-hand port is dirtier than the left-hand port. This was discovered when Dan removed the headers, which was before another tuner was involved, before the supercharger was installed, before the 38# injectors were installed, and before the 90mm MAF was installed. In other words, the picture shows how things were running for the last year.

Then more than likely if one side is this way then more than likely the other side may be too the burn must start to the right and travel to the left because the flame travels across the piston. Joey

[gamiller]

Originally Posted by BurritaSVT

Then more than likely if one side is this way then more than likely the other side may be too the burn must start to the right and travel to the left because the flame travels across the piston. Joey

it's just the one bank. the other bank has both ports looking the same (i.e. clean). strange, huh?

[Badazzcougar]

Originally Posted by Blackcoog

I just want to make sure we are chasing the correct problem. I didn't see much feedback in the forum after we suggested swapping MAF's or running NA to work out the issues. I still haven't heard if he tried running it NA successfully. Last I heard he was having issues NA so that would lead me to believe MAF placement isn't an issue. Badazzcougar is seeing the same issue and he has his MAF before the supercharger. I'd rather not see Andy spend money on a blow through MAF and end up with the same result. Chris

I actually just fixed my issue yesterday, I stuck screens before and after the lightning Maf and my idle is perfect. I just have to go get it retuned again for the 3rd time with the screens in place. The lightning Maf is super sensitive compared to our stock mafs with turbulence issues. I think with the tight bend I have right after the maf and the bypass valve constantly dumping it was pissing the maf off,I never had any problems with the stock maf,so I didn't think anything of it.

[brapple]

Originally Posted by Badazzcougar

I actually just fixed my issue yesterday, I stuck screens before and after the lightning Maf and my idle is perfect. I just have to go get it retuned again for the 3rd time with the screens in place. The lightning Maf is super sensitive compared to our stock mafs with turbulence issues. I think with the tight bend I have right after the maf and the bypass valve constantly dumping it was pissing the maf off,I never had any problems with the stock maf,so I didn't think anything of it.

what did you use for a screen? sounds like a good idea even if there aren't any issues since the SVT came with a maf screen.

[DanG]

The car's back at Excessive for another go-'round... The PCV system did have a vacuum leak, but it wasn't nearly bad enough (IMO) to cause the ridiculous bouncing idle. It fouled a set of plugs and used a quarter tank of gas getting from the tuner to my place and back. <Sigh>

Work in progress... I see Joey's point about the non-laminar airflow past the MAF, but there is a metal screen there, no BOV bung, or any other disturbances. The guy says he can do it- All I know is that he's running out of excuses...

[AndyMan]

i am trying to wonder at this point...
If the SC belt was disconnected and we put a short ram intake infront of the 90mm MAF/ or the stock MAF back on... and changed the injectors back to 19lbs... Then it should be in its orginal 3L form. For the last 3 month or so, the 3L wasn't at its potential due to the exhaust leak from the headers which are now fixed.
If we have to fix this car again, ( which sould not be happening at this point ) i guess to good tests to perform like most of you guys said to do already is to see if the car can run NA...

First test stock MAF/ 19lbs injectors...NA
then run svt90 MAF/ 38lbs injectors... NA

see what then happens