Cant get 17 psi out of her this year. Never had this happen, I think fuel cut, but no recent mods done. Have had the same simple setup for 2yrs with no issues getting to 17 psi an holding strong. fresh ngk's@.035. 2004 w/52k miles. Mopar wires, 22k on stock coil. stg 1. stg 2 w/g. mopar exhaust. hallman es mbc. tru-flow air filter.
Went to turn it from 15 to 17 this spring and get crazy hesitation and then it sounds like a salute went off under my hood. scared the shit out of me. anything over 14 gets the hesitation and BOOM. but up that it runs great and pulls hard... so I am thinkin clogged injectors or bad boost gauge??? (although boost gauge seems fine)
My setup is totally different from your's . . . 2.6 full race stroker motor, but I get the hesitation right at 120 mph 4th gear in the 4K rpm range. No boom though. I think I'm dealing with spark blow out. Been regapping the plugs and have them down to twenty one thousands from "25" and it pulled hard last night to 140 mph without issue. Made another pass under an uphill load and it happened again at 120 mph. 19 thousands is the last test before I move on to other things.
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2005 Import Wars Slick Class Champ New England Dragway 2006 SRT Nationals Champ Heartland Park Topeka Kansas 2006 Class Winner Englishtown New Jersery 2006 Top Eliminator Englishtown New Jersery
2003 Flame-Red SRT-4 BEST TIME:11.51 Best MPH: 122 Best 60': 1.673 MODS: Darrell Cox Racing Built.
My setup is totally different from your's . . . 2.6 full race stroker motor, but I get the hesitation right at 120 mph 4th gear in the 4K rpm range. No boom though. I think I'm dealing with spark blow out. Been regapping the plugs and have them down to twenty one thousands from "25" and it pulled hard last night to 140 mph without issue. Made another pass under an uphill load and it happened again at 120 mph. 19 thousands is the last test before I move on to other things.
Strange you say this Ed. I'm running stock longblock w/50trim and I get this same issue. I get misses in the 4k rev range , thinking spark blowout, I gapped down to .029 but haven't tried a smaller gap. I figured it shouldn't be spark blowout, since i've had this setup/tune for a bit and no previous issues. Leaning toward tps sensor flaking out on me, if htat doesn't work i'm going to try the coilpack. just clicked 101600 on the odometer, so I expect things to need replacing
so far I've
rewired the tps
rewired the fuel pump (didn't do it the "common" way, never understood why people put a relay at the pump)
new intake manifold gasket
boost leak tested
checked ecu wiring from safc
checked w/i system
Strange you say this Ed. I'm running stock longblock w/50trim and I get this same issue. I get misses in the 4k rev range , thinking spark blowout, I gapped down to .029 but haven't tried a smaller gap. I figured it shouldn't be spark blowout, since i've had this setup/tune for a bit and no previous issues. Leaning toward tps sensor flaking out on me, if htat doesn't work i'm going to try the coilpack. just clicked 101600 on the odometer, so I expect things to need replacing
so far I've
rewired the tps
rewired the fuel pump (didn't do it the "common" way, never understood why people put a relay at the pump)
new intake manifold gasket
boost leak tested
checked ecu wiring from safc
checked w/i system
i'll have to find the culprit eventually
I never had this issue before, but it has got better at twenty one thousands on the plugs. TPS has been in the back of my mind as well as the coil pack. Reading the plugs and they look fine. I did put a new style Hondata intake manifold gasket on and did retorque it after several runs, but I'll revisit that again. Even elimated the w/i system too. I will find it
what does your a/f look like when it starts to spit OP? ed what heat range plug are you running?
With the 2.6 stroker with the full race head I'm running NGK Ridium BKR7EIX which have a short reach of 18mm compared to the NGK Ridium LZTR6AIX Ridium which has a reach of 25mm. Naturally the BKR's have a shorter insulator nose (colder) then the LZT's. The BKR's run really clean, but I should scope them to see detail on the insulator, but with the naked eye they look good. Darrell Cox recommened the BKR's and never had a problem with them running on the AEM EMS. That's another thing on my list to try, swapping the LZT's back in while running on the S3 ECU. Naturally S3 as always is running pig rich under ECU control.
Hum... That gives pause for thought.
Don't want to lead you astray. So keep in mind you know more about what you've done to your car than me. But here goes for what it's worth. And that may not be too much.
First thing I would check is secondary ignition. Sounds like you been there and done that. An Ociloscope is a great tool. Without one it's guess work, and replaceing parts.
Next I would take a good hard look at the coil and what drives it. In simpler days I would have tightened up the point gap and made sure your coil was up to the task. Now with this car you have that waisted spark to contend with. Loose spark on the compression stroke then BOOM one the exhaust stroke.
Really does sound by your description that you are loosing spark.
The Spark-Blow-Out. Im guessing this is in refferance to spark brake down. Coil will do that. Quick thing to check. Tachometer flutter at all? Just a halfass quick check for a CRP sensor.
Short plugs, long plugs, cold plugs, hot plugs. Has the makings of a Dr Suess rhyme. Anyway. We index plugs or get shorter ones in the tall piston engines to keep the piston from mashing them. Thing is it makes a dead zone. (not a quench area) Not much. Still starts the fire, and does keep the electrode from glowing red. Better to just get a colder plug in my opinion. Start the fire in the chamber.
Anyway. No codes, and If I didn't find anything with the ignition system I would plug in the scanner and start taking pictures when the drivability problem occured and see what you might see. I'd be interested in the MAP, RPM, Crank, Cam, O2-1 and TPS
Good luck and please post what you find. This is interesting.
PS Coil and injectors are feed off the same wire from the ASD Relay as is a bunch of other stuff. There is noise surpression on that line. Should be on the rear of the head drivers side. May look like a flat rectange with a wire coming out of it. Had one of these poop out in a sebring. Cause some very strange Upper rpm band problems.
Again
Good Luck
Cant get 17 psi out of her this year. Never had this happen, I think fuel cut, but no recent mods done. Have had the same simple setup for 2yrs with no issues getting to 17 psi an holding strong. fresh ngk's@.035. 2004 w/52k miles. Mopar wires, 22k on stock coil. stg 1. stg 2 w/g. mopar exhaust. hallman es mbc. tru-flow air filter.
Went to turn it from 15 to 17 this spring and get crazy hesitation and then it sounds like a salute went off under my hood. scared the shit out of me. anything over 14 gets the hesitation and BOOM. but up that it runs great and pulls hard... so I am thinkin clogged injectors or bad boost gauge??? (although boost gauge seems fine)
While going through my older plugs last night I did rediscover that I had issues with my NGK LZTR5AIX-13 and LZTR4AII plugs. I had spark blow bye through the white porcelain insulator of the plug. I subsequently went to the NGK LZTR6AIX-13 plugs and it eliminated that issue. You may want to check that area for small black trace marks. Looks like very fine pencil marks. At this time I was running stage 3 on the stock motor.
John, you bring up some other ideas with my issue that I'll check too. Never thought about the secondary ignition circuit. I should really also index my plugs as I checked that last night and they face in every which direction.
With the 2.6 stroker with the full race head I'm running NGK Ridium BKR7EIX which have a short reach of 18mm compared to the NGK Ridium LZTR6AIX Ridium which has a reach of 25mm. Naturally the BKR's have a shorter insulator nose (colder) then the LZT's. The BKR's run really clean, but I should scope them to see detail on the insulator, but with the naked eye they look good. Darrell Cox recommened the BKR's and never had a problem with them running on the AEM EMS. That's another thing on my list to try, swapping the LZT's back in while running on the S3 ECU. Naturally S3 as always is running pig rich under ECU control.
huh??? he asked your a/f... lol noobie nice to finaly see the car comming along ed! they are gona be repaving the burnout pads after your done haha
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* Disclaimer...The above post may or may not have misspelled words ...deal with it...
A/F . . . What's that 116 Octane and what me worry I think I got it all figured out and tonight will be the true test. It ran really great this afternoon without any incidents.
Tomorrow into Miller Racing and have the tie down brackets put in and then I should be all set for the MOPAR Nationals at ETown on the 16th, 17th and 18th.
so ed since i havent seen any pictures of your car or know no more than its a stroker dcr motor with alot of tweeks.. is it still a street car? or strickly a track car?
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15psi-hestitation, then goes BOOM!
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116 Octane and what me worry 
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