ford mustang s/na question

[rick978]

are you allowed to run the moates setup in this class . rule book does not seem to be clear on it from what i can determine .
we are running a 1989 computer/306 venom 19lb inj scorpion rockers 1.6 allowable cam c4 auto 4.56 gears (soon to be 4.88)with a 30 inch tall tire .our best time is a 12.9 but most of the time it runs 13.1.what suggestions does anyone have that i can run legal nhra stock elim n/a for upgrades ?injectors/maf 5.13s/computer work if allowed .thanks and i know some people do not like to give up there secrets and i understand that and respect it but i would not mind being pointed in the right direction
also should i be running the o/2 sensors /spout/egr etc all new to me
thanks again rick r and neal l

[fordteacherguy]

Rick,

You have a PM

[FireSale]

Listen to ^^^^ He knows his Ford Stuff. He's been of great help to me.

Dale

[rick978]

thanks guys will do going to track tonight going to try 28 tall tires . what is the advantage i see some guys run without the spout conn in place ?

[fordteacherguy]

Rick,

Pulling the "spout" (spark output) plug takes the computer out of the loop for adjusting timing and locks the base timing at whatever the distributor is set at. You can try either way either way of running fixed timing (spout out) or computed timing (spout in) but either way you will have to readjust timing to get close to what you want for your max advance. A good starting point with running the spout plug out is 32-34 degrees total at 3K rpm .Some run better with more total... some like less.

The disadvantage of running fixed timing is...we'll just that, there is no timing "curve" to meet the varying engine needs and you are starting out with a LOT of initial advance that can give a pretty rough idle and hard starting. On a drag car with narrow RPM requirements...big cams..low cyl pressure...not usually a problem if it starts and idles ok. Lots of guys run theirs that way. I typically use the spout and computed timing on vehicles with factory computers, set timing around 14 for starters w/spout out, plug the spout back in...snap throttle and see where total ends up. I run my SSer Stocker like that last 3 years works fine and consistent. My stocker has a programmable computer and I just set the curve how I want with that. My stocker cams like 18-22 initial timing and total varies with weather conditions but 34 is not a bad base.

Good Luck!

[rick978]

thanks again for the info
you did mention getting rid of the stock maf
we are currently ruuning the venom 19lb inj with a cold air kit
if we were to upgrade maf with the 19 s whats a good starting point seeing since they are a bit pricey to keep swapping out
seeing since the egr is deleted i did notice you are running a programmable computer any brand prefferance moates tweecer ?sorry for all the questions but i am still an old carb guy on a big learning curve as to what can be run and what cant and how they all work together

[fordteacherguy]

The factory MAF is a 55MM housing, smaller and more restrictive than the 60MM throttle body housing. There is probably some performance increase there using a MAF w/ larger diameter. Not familiar with the Venom system. It looks like a MAF signal modifier that is useful for tailoring MAF transfer rates and fuel curve and probably would still work with whatever size larger MAF you go with. I run a 73MM C&L with the cal tubes to adjust for injector size. It get's the curve in the ballpark and I adjust my A/F curve with my programmer from there.

[Marty Buth]

After market EFI controllers are allowed, if they are on the NHRA approved list. If your controller isn't on the list, send the information via e-mail to NHRA tech and you will probably be able to get it approved.

[rick978]

where would i get this list of approved efi controllers nhra web site ?
ran last night cooler temps 12.9 then 13.0then 13.4 tire slippage on line on the last one

[Marty Buth]

Go Here:

http://www.nhra.com/userfiles/file/N...edProducts.pdf


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