MY CAR HESITATES????

[bowtietrader]

i put the 1.6 roller rockers on.. thanks
i have 30#ers, a 255 pump, but a stock regulator...speed density also, i also have a stock computer.but a lot of other parts.im at 6 degrees timing and 40psi of fuel pressure... i will be spraying a 150 shot.. so what should i try to put this all at?? or should i not drive it until my reg gets here???.

when i get it on it my car hesitates really bad.. i dont know why, too much fuel?? maybe i need my computer burned for what i have? i have no idea..

any ideas will help
thanks

 

[DMAN302]

injectors and the SD are probably not working well together..the computer is set for the stock fuel system and can create really crappy fuel curves when items are changed, I would convert to mass or go back to 19's and bump fuel pressure to 44-45#

 

[Daggar]

What's the rest of your setup? (h/c/i). How long you has those injectors in? They're awful big for an otherwise stock setup.

 

[5.0Droptop]

you dont need 30# injs just for nitrous.

 

[bowtietrader]

i have gt-40 upper/lower, trick flow aluminum heads, .40 over, bbk long tubes, no cats h-pipe, no a/c, no power steering,
all kinds of mods, im no where near stock... what should i set my timing at?? well should i get my computer burned for 30's??

 

[5.0Droptop]

you may need a chip to make the 30's work. a dyno tune would help.

 

[bowtietrader]

well if i switch to mass air, and tune the mass air for 30's will that work?? also what all do i need to change to mass air?
thanks

 

[5.0Droptop]

youd need a meter calibrated for 30 # injs pro m is the best imho.
youd need a mass air eec a9l or a9p I used the a9p.
you can buy a harness from ebay that works great.

heres some ideas
http://cgi.ebay.com/ebaymotors/ws/e...tem=7921960680&category=33596&sspagename=WDVW

http://cgi.ebay.com/ebaymotors/ws/e...tem=7922783093&category=33553&sspagename=WDVW

 

[bowtietrader]

any harness from any 87-93 mass air mustang will work?? do i have to change the injector harness also?? or just the computer harness???

 

[5.0Droptop]

all you need is a conversion harness. its in the second link i posted. It comes with the instructions on how to convert to maf. its very simple the whole process to me about 1.5 hrs.

 

[Daggar]

Mass air would be your quick fix however (comma) The thirty lb injectors shouldn't be the cause of your problems. The SD computer would just shorten the duty cycle of the injectors to correct the AFR. My concern would be (with the stock SD fuel tables) the whole setup being too lean for nitrous. The stock SD computer will try an maintain a 14.7 (approximately) AFR at idle and richen it up gradually depending on RPM and poewr setting. At an rate, It would be leaner than what is probably safe for your nitrous. I don't think your SD and and 30 lb injector combo alone is causeing your hesitation problem but the stock fule tables are also not ideal for your nitrous either. So yeah... custom chip or MAF for the nitrous but search elsewhere for hesitation. The SD should compensate for your new injectors.

 

[bowtietrader]

my timing is at 6 degrees. do you think that could do it??? or maybe the stck FPR..???

thanks

 

[Daggar]

Defenitely a possibility. Stock timing is 10*. Set it at 14 but be mindful of detonation just in case.

 

[bowtietrader]

ok, now what about when i spray?? whats a good setting for NOS?