DTC's came back

[Gorman]

Hi A. thanks for that.. using FUTEK Conversion Calculator | Unit Conversion Calculator | Online Conversion Calculator and Stealth 316 - Air/Fuel Flow Calculators from these two calculators it seems your 130g a sec is spot on. (80% duty 17lb ers etc). Just plugged in 19 lb injectors and they need 146. 21's are 158 !! Looks like my airbox is really packing in the air. Good job i left an exit for excess air pressure...could have fried the engine with a very lean mixture !! Anyone care to run an eye over this to see if i have made an obvious mistake..if anyone has numbers for a wheel well CAI for comparison..please post. cheers G.

[cpapashley]

Originally Posted by Gorman

Hi A. thanks for that.. using FUTEK Conversion Calculator | Unit Conversion Calculator | Online Conversion Calculator and Stealth 316 - Air/Fuel Flow Calculators from these two calculators it seems your 130g a sec is spot on. (80% duty 17lb ers etc). Just plugged in 19 lb injectors and they need 146. 21's are 158 !! Looks like my airbox is really packing in the air. Good job i left an exit for excess air pressure...could have fried the engine with a very lean mixture !! Anyone care to run an eye over this to see if i have made an obvious mistake..if anyone has numbers for a wheel well CAI for comparison..please post. cheers G.

My only thought is what is the voltage?? just in case something wrong with the reading. Now I know it is not linear, but should be able to interpolate in some way to get a pretty good indication if something is a little out in the calcs.

So what Maf voltage were you running at?

Maybe a couple of figures would be good to work out if it tracks the same as mine or not.

[cpapashley]

Found a good thread with a couple of rates for various cars.

looks like svt is around the 160 g/sec or 21 lb/hr



flow rates

What is interesting is using that stealth calculation page, means that if my temperature is 9C as opposed to my current 30C I would flow 7% more air....No wonder the car feels so different in those cool spring/autumn evenings.

What amazes me is with a simple change of the SVT intake, the vehicle can flow 20% more air. I know there are lots of figures out there but that is a serious difference with something as simple as an intake. Certainly backs up so much what spook says about velocity/intake configuration.

Would just love to get a custom plenum done, or even better, just take the top of each end of my current 2.5l intake and somehow enlarge it 30% and see what sort of difference it would make to air flow. Wish I new more on this area.

[Gorman]

I haven't logged the MAF voltage yet..do you know what the max air volume for the stock MAF is ? The route i'm exploring is ram air system...volume of plenum is less important 'cos there is plenty of air coming in under slight pressure. I take it you can't see anything wrong with the numbers we figured ?.. You could always take a hacksaw to a spare UIM. Confirmation about the meaning of the long term fuel trims would still be appreciated thanks G.

[cpapashley]

Originally Posted by Gorman

I haven't logged the MAF voltage yet..do you know what the max air volume for the stock MAF is ? The route i'm exploring is ram air system...volume of plenum is less important 'cos there is plenty of air coming in under slight pressure. I take it you can't see anything wrong with the numbers we figured ?.. You could always take a hacksaw to a spare UIM. Confirmation about the meaning of the long term fuel trims would still be appreciated thanks G.

Must have missed your point on the ltft will check that tomorrow.

I will post up a pdf I have logged, seems to show interesting changes especially round the 5800rpm mark, wondering if some sort of reversion is occurring?? or is the cam profile useless??

[Gorman]

.. driving home everything began to make sense. I was reading that a rich mixture is good for torque at WOT. It also said slightly lean is good for power at part throttle. I remember posting after putting on my p+p 'ed 65mm TB that my throttle works well to half way...but going full throttle makes very little difference. 19 lbers are going on....hoping to make enough progress that i need 21's !!.. G.

[cpapashley]

Originally Posted by Gorman

.. driving home everything began to make sense. I was reading that a rich mixture is good for torque at WOT. It also said slightly lean is good for power at part throttle. I remember posting after putting on my p+p 'ed 65mm TB that my throttle works well to half way...but going full throttle makes very little difference. 19 lbers are going on....hoping to make enough progress that i need 21's !!.. G.

Sounds great, are you able to post up a list of mods. I am in the midst of choosing my future plans for the MPV, seeing there is this new product called sniper that may be able to directly tune the factory pcm, without the need for a piggyback. I am especially hopefull, seeing they boast that it will work with all eecv pcm's

Might not have to go greddy at all. It would work out similar cost if I connect up emanage and tune, as opposed to this "sniper option".

I would love to see some datalogs of your engine, and see the airflow vs mine, to see where the change in various mods have made a difference.

You can pm me the data, I am happy to do graphs....

[cpapashley]

Just on that lean code, about halfway down there is a nice little snippet of info on those codes from the mpv manual.

http://forum.mpvclub.com/viewtopic.p...ighlight=p0171

[Gorman]

mods wise; i have SVT lite with mustang TB. A set of headers, optimised y pipe and stock cat, (for quietness) and my airbox behind the fender. I feel it has lots of potential ( some hinted at ). I haven't put the optimised 34/35 LIM on or port matched anything yet. Gonna whip the cam cover off when i do the injectors and new harness, (old one's gonna get spliced for the 21 lb returnless injectors i have) just to check which cams i have....my car revs round to rev limiter far too quickly for me to change up sometimes... hoping someone put SVT cams in ( well you can always wish). If not, it's on the list for next year. Now i've got the data logging going, i can really see what works and what is imagined by my butt dyno. When i get the data logs worked out i'll send you some data...gonna need to work that out for a tune. I've wondered if you can flash with a logging tool...hoping it's the software, since you can cancel DTM's you must be 'talking' to the ecu. I'd love to see a pic of your headers..you must be the only one on NECO that has them !! Hope you had a great christmas and thanks for posting and keeping me company...G.

[cpapashley]

Originally Posted by Gorman

mods wise; i have SVT lite with mustang TB. A set of headers, optimised y pipe and stock cat, (for quietness) and my airbox behind the fender. I feel it has lots of potential ( some hinted at ). I haven't put the optimised 34/35 LIM on or port matched anything yet. Gonna whip the cam cover off when i do the injectors and new harness, (old one's gonna get spliced for the 21 lb returnless injectors i have) just to check which cams i have....my car revs round to rev limiter far too quickly for me to change up sometimes... hoping someone put SVT cams in ( well you can always wish). If not, it's on the list for next year. Now i've got the data logging going, i can really see what works and what is imagined by my butt dyno. When i get the data logs worked out i'll send you some data...gonna need to work that out for a tune. I've wondered if you can flash with a logging tool...hoping it's the software, since you can cancel DTM's you must be 'talking' to the ecu. I'd love to see a pic of your headers..you must be the only one on NECO that has them !! Hope you had a great christmas and thanks for posting and keeping me company...G.

Have you checked out sniper?? I am hoping it will work for me over her in Australia. Now that I have managed to get some datalogging.

Which system were you using for datalogging again??