Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 240cc.
 

So it runs super super lean on a 450cc map, and even a 390 map, and runs decent (little bit rich) on a 240cc basemap. WTF? The injectors are black tops, and they say "450" on them. Any ideas? :l

Re: Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 240cc.
 

try swapping the black tops with blue top dsm's like i said in the other post. this way i can say i told ya so

Re: Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 24
 

If they say MDL450 on them, they're 450's

Re: Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 24
 

What would cause such low fuel pressure if they really are 450s? Its running very well right now on a 290cc map.

Re: Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 24
 

im sure you used a resistor box or inline resistors if needed right???

Re: Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 240cc.
 

he had a set of bluetops , my old ones, but he wanted to keep the "newer 450s" and now yeah.. yes he has a resistor box, its an obd0 car.

Everywhere ive read it says all dsm injectors are peak and hold. Anyone have evidence to show otherwise?

Re: Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 240cc.
 

all dsm are peak and hold

BLUE TOPS and blacktops TUNE DIFFERNTLY

a 450 blue top on X car is good afr

a 450 black top on Z car is running lean or rich

its becuase of the spray pattern

Re: Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 24
 

bluetops have single spray pattern.
blacktops have duel spray pattern.

Re: Blacktop DSM injectors, car runs like shit on a 450map, runs awesome on a 240cc.
 

for the one millionth time, put on the blue tops and tune the map for 450's. problem solved. why doesn't anyone listen?