Backfire

92 Ty 1173

92 Ty 1173

Active member
Ok, build goes, .30 over, L35's w/ 2.02/1.60 ported and polished, comp 422 cam, 20g turbo, stock injectors, AFPR set at 52psi, Walboro 255 pump and an ultimate for a stock truck. So while I'm driving it sputters every once in awhile but when I throttle it, from a low rpm it backfires and carries on, no matter what timing setting is on the ultimate. At a higher rpm it seems ok, goes like hell, even with little boost. I know the chip is for a stock truck but I was hoping it would run ok till I get it reburned or get my $59 stuff. Any ideas? BTW my boost is turned down to about 5psi cause I'm still breaking it in, got about 300 miles on it. I plan on picking some brains at the NASTE meet but thought I would get a head start, maybe have it running better till then. Thanks
 
MRKING

MRKING

New Parts for Old Trucks
Re: Backfire

Your 422 cam , larger turbo , and modded L35's need a custom tune before driving around honestly . The stock truck ultimate chip with a higher fp setting is giving incorrect parameters for what your combination wants . If you dialed in the fuel pressure to idle well at startup , it will under preform at higher rpms . If you set the fuel pressure to preform better while driving around , your idling and wot will take the hit . With as easy as it it to blow these things , i wouldnt chance it if i were in your shoes . Sounds like your almost there , rushing it now could create undesired setbacks .
 
92 Ty 1173

92 Ty 1173

Active member
Re: Backfire

Yeah, kind what I was afraid of. Sorry, no datamaster, I have no laptop. This sucks, 4 years in the making and now I gotta wait some more, $#&@%##^@&!!!!!! Just checked out the TTS site, can the cable be gotta anywhere else or just them?
 
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