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Surging/surges/bucks ..
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<blockquote data-quote="SNK-BIT" data-source="post: 3889107" data-attributes="member: 32409"><p>First question..any one else having problems as of late connecting to this site? When I do connect no ones avatar is showing up. Second question..what is proper in bringing an old thread back up or keeping it alive? I ask as I have a few old ones that were not closed but I feel could be in the near future. I don't want to add to it to get it back to the top but just want to close it properly. Thanks.</p><p></p><p> Now to the subject of bucking/surge/surging/hitches/etc..Is anyone/everyone running a cooler (180) thermostat. And is anyone running a stock (maybe with K&N) airbox setup?</p><p></p><p> bat-stang..when you had your tune did you ask for power and/or fix surging? On your first post you stated that your tuner said this was notorious for the cam and heads on your car. I think my cam has larger #'s than an e-cam but your bucking is @1700 and mine is 1300-1500 and bad93svt (largest cam of the 3) is @ 2300rpm. I would think you and I would be switched in the rpm (bucking) department according to cam size if the cams are indeed (or at least part of) the culprit. It TOTALLY goes away with the slightest application of throttle. Does yours? By the way, which heads are you using? Please let us know if you have this dyno tuned and how it turns out. I will do the same when I'm satisfied I can do no more. Could you find out if you really do have an A9L? Do you have access to a scan tool and if so can you get DCL data from it? As a side note by doing the proper IAC reset (it's also a new IAC) with no KOEO or KOER codes I can get my present configuration down to a solid 750-800 rpm. No problem there.</p><p></p><p> SVT Lurch..do you remember cam size? Does your name have anything to do with the cars you've rode in? A tune fixed those cars you rode in?</p><p></p><p> bad93svt..which throttle body? .. I was thinking of getting a 70mm BBK..comes with TPS. Your tuner says that for 1K they can make it drive like "factory". I hope this is not the norm for a dynotune! Can you read the DCL data from the A9L you have now?</p><p> </p><p> LEE93COBRA..Advice taken..so it looks like your the first in this thread to have a hotter cam, bigger MAF, bigger injectors, better heads and had no bucking. What size was the MAF with 42lbs and then with 60lbs Injectors?</p><p></p><p> General observations..I have cold and hot checked resistance values on every sensor and they all checked good. I started replacing them anyway. 2 new Bosch o2 sensors, smoother..still surges. IAT sensor..still surges. ECT sensor..still surges. MAP sensor..still surges. TPS sensor .set @.96v..still surges. Vacuum @ idle 16inhg. Tried raising fuel rail pressure and bucking seems to lessen when doing this. Have gone as far as 50psi. What is the computer looking at between closed throttle at 1500rpm and "slightly" open throttle @ 1500rpm? Some where in there is the answer. Have new MAF coming tomorrow..will see..might even try the stock airbox myself..I'll be back.</p><p>Thanks again to everyone.</p></blockquote><p></p>
[QUOTE="SNK-BIT, post: 3889107, member: 32409"] First question..any one else having problems as of late connecting to this site? When I do connect no ones avatar is showing up. Second question..what is proper in bringing an old thread back up or keeping it alive? I ask as I have a few old ones that were not closed but I feel could be in the near future. I don't want to add to it to get it back to the top but just want to close it properly. Thanks. Now to the subject of bucking/surge/surging/hitches/etc..Is anyone/everyone running a cooler (180) thermostat. And is anyone running a stock (maybe with K&N) airbox setup? bat-stang..when you had your tune did you ask for power and/or fix surging? On your first post you stated that your tuner said this was notorious for the cam and heads on your car. I think my cam has larger #'s than an e-cam but your bucking is @1700 and mine is 1300-1500 and bad93svt (largest cam of the 3) is @ 2300rpm. I would think you and I would be switched in the rpm (bucking) department according to cam size if the cams are indeed (or at least part of) the culprit. It TOTALLY goes away with the slightest application of throttle. Does yours? By the way, which heads are you using? Please let us know if you have this dyno tuned and how it turns out. I will do the same when I'm satisfied I can do no more. Could you find out if you really do have an A9L? Do you have access to a scan tool and if so can you get DCL data from it? As a side note by doing the proper IAC reset (it's also a new IAC) with no KOEO or KOER codes I can get my present configuration down to a solid 750-800 rpm. No problem there. SVT Lurch..do you remember cam size? Does your name have anything to do with the cars you've rode in? A tune fixed those cars you rode in? bad93svt..which throttle body? .. I was thinking of getting a 70mm BBK..comes with TPS. Your tuner says that for 1K they can make it drive like "factory". I hope this is not the norm for a dynotune! Can you read the DCL data from the A9L you have now? LEE93COBRA..Advice taken..so it looks like your the first in this thread to have a hotter cam, bigger MAF, bigger injectors, better heads and had no bucking. What size was the MAF with 42lbs and then with 60lbs Injectors? General observations..I have cold and hot checked resistance values on every sensor and they all checked good. I started replacing them anyway. 2 new Bosch o2 sensors, smoother..still surges. IAT sensor..still surges. ECT sensor..still surges. MAP sensor..still surges. TPS sensor .set @.96v..still surges. Vacuum @ idle 16inhg. Tried raising fuel rail pressure and bucking seems to lessen when doing this. Have gone as far as 50psi. What is the computer looking at between closed throttle at 1500rpm and "slightly" open throttle @ 1500rpm? Some where in there is the answer. Have new MAF coming tomorrow..will see..might even try the stock airbox myself..I'll be back. Thanks again to everyone. [/QUOTE]
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