I just got done installing a SR and #30lb from 24lb inj. I've been using the arap on it with the 24lbers and siam runners and really had it dialed in-good starts idle etc. Now after some tuning I'm still having a hard time with it surging then even stalling at times after start up unless I give it 1/4 to 1/2 throttle. After about 30sec. then it's fine. I've tried IAC park, open loop f/a vs cool, etc. without success-has anyone else had this problem after larger inj. only? Or with a SR? I've already got the blms close to 128, and it does run fine everywhere else. Thanks for any ideas!!!!

 

Old post..but I have the same question.

 

Sounds like it's too lean.
Also might look at the cold engine timing adder.

 

I have the same problem as you...I went from stock TPI to HSR with 24lb injectors...the only thing I changed in the bin was the flow rate to 26...do you have any suggestions what else I should change? my car doesn't idle when it's cold till it warms up for like 2 minutes...then it fluxuates between like 600 and 900 rpm's.

 

Injectors do vary in linearity.
Sounds like you need to add fuel in the MAF 1 Table.