I would call Al directly and obviously would rather he answer this, but I know hes very busy and this is not exactly on the top of his list of important things to answer, so does anyone know, 1) after having a custom tune, if you upgrade your mass air pipe and get a new cleaner filter, will the tune adjust to this or do you need a reflash/new custom tune? Also same question for lower and upper intercooler pipes. Logically I would think that the air fuel ratio would still be forced to about 11.1/1 but obviously stock adding an intake messes things up so if anyone knows for sure or if Al you want to chime in let me know. 2) Also how much do you guys think poor/rainy/****ty weather would affect my dyno results. I was expecting with my mods about 300 hp and 305 torque compared to many others and only showed 280 hp and 285 tq so maybe that was the ****ty weather? Thanks for any help you guys have.
kyle

 

Were you at Pruven on Tuesday? If you were my car was the other red one there, the guy that Al pointlessly attempted to belittle in front of his important customers with fresh cash in hand.

On a more appropriate note, your cars numbers with what you had, includign the stock cat if im not mistaken and a chambered muffler seem pretty good and inline with what to expect.

My car with a highflow cat, straight through exhaust and otherwise similar modifications made 275whp/310wtq if you recall, with a boost leak at hte discharge pipe which I later confirmed and rectified so your numbers seem comparable.

Assuming you add the high flow cat and possibly go with a less restrictive axel back section (if i remember your setup correctly) 300whp or so should be in line without any need for a retune. On the same note my cars hp deficiency supposedly should be rectified in having solved my boost leak issue, without the necessity of a change in the tune, in both cases we shall see.

My advice would be to add the highflow cat first and redyno the car verifying that the fueling is still closely consistent with what Al attempts to maintain, I'll be doing similarly in the next week or so so we'll both have a definitive reference for remedying our slightly underwhelming peak output numbers.

 

1) No, you will need a retune/custom tune if you change the pipe that houses the MAF. Its dangerous to run with a base tune while changing the intake as this could lead to lean conditions as your MAF signals will probably get screwed up.

2)Lower and upper intercooler pipes most probably won't need a reflash and is safe to run but you probably won't get the max out of them unless you retune.

3) Weather and Temperature and greatly affect the results of a dyno run. Cooler temperatures will give you higher dyno #s and hotter temperatures will give you lower dyno #s.

Hope that answers your questions ...

 

I guess I just dont understand what the point of the MAF sensor is then. I thought it tells how much air flow is coming in and tells your car how much fuel to use. I'm still learning but please correct me if I'm wrong. I mean if more air is coming in doesnt your car recognize this with the current tune and adjust to keep the 11.1/1 a/f ratio? I would think that the intercooler piping would screw things up more sending more air directly to the manifold without anything reading or recognizing that more air is about to combust. Anybody who wants to school me in this, it would be greatly appreciated, I'm just here to learn and get the most out of my vehicle. Thanks

kyle