flyingscot

iTrader: (2)

hey peeps,maybe someone can shed some light on this problem,my car is a dedicated race vehicle that is never used on the street,when i was at the track last time my car would idle fine and run nicely at the beginning of a given session but toward the middle and end it would start stuttering and bucking under partial throttle,good when wot and ok when all the way off it but horrible at partial when trying to balance the car under throttle,my car is obviously modified and ran on e85 for the first time out last event,brief list of mods are .....1200cc rc inj,ams750r,full blown double pump with hobbs switch,ams fuel rail,stock maf config,synapse bov,ets 3.5 i/c and short route piping,hallman mbc,ive tried to list the pertinent mods only,i should note that the car used to have a fp red and ms 101 before and no other fuel upgrades and it ran great before it blew up and caught fire!what you guys think?

flyingscot

iTrader: (2)

and just so some people that know me are aware,i do have a tuner who takes care of the car and i would trust him with my dog,this thread is just for me to understand what may be happening

gsrboi80

iTrader: (38)

Any CELs??

Could be an ignition or a fueling issue.

Is you double pumper set up so only 1 pump is on during those part throttle situations or are both pumps run constantly.

Could explain why WOT is ok and part throttle is breaking up

flyingscot

iTrader: (2)

the second pump comes on at 8psi i think i was told,they dont run constantly,i was thinking ignition too,im trying to avoid buying a super duper ignition system if i dont have to lol,we are currently putting the fuel system back to stock plus the single walbro to get a base where we can test,thanks for the input,any other thought anyone?

haseeb

iTrader: (2)

i wana know this also ...
any 1 ?