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SVT Shelby GT500
Engine locked up...
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<blockquote data-quote="SCGallo2" data-source="post: 16432865" data-attributes="member: 160791"><p>Pleasure doing business with you Sir. Just a little clarification... I have never had any issues with the blower. My early driveability issues were self-inflicted by asking Lund to tune my combination with the Ford Racing/PHP fuel pump assembly with Walbro GSS342 pumps (not recommended in a returnless system) and ID1000s. He said we could try and fueling appeared good on the datalogs so we went with it. My main issue was cold start fueling in open loop operation, my car stumbled during pedal transitions; once at full operating temp and in closed loop fueling the car drove great under normal conditions and ran strong. Lund didn't see this as a big issue and wasn't interested in trying to resolve it. A second issue was transitions from 1st gear on boost to off boost and then back on the gas, my car would stumble when fuel pressure fluctuated, again which I can relate to the fuel pumps not liking to be switched on and off. I never brought this issue to Lund's attention because it happened so infrequently, but it bothered me.</p><p></p><p style="text-align: left"><span style="font-size: 15px"><span style="color: rgb(204, 204, 204)">When I decided to switch Tuners, I contacted JDM and we discussed my setup and driveability issues. They wanted me to return the fuel pump assembly back to stock before they tuned it, which I did. I planned on taking the car to them for a dyno and drive tune. In the meantime, they sent me a basic startup and drive tune so I could drive the car and it ran pretty good. I still had a little cold start open loop fueling stumble during pedal transitions, but it was better. When I dropped the car off with them, I asked them to work on cold start fueling and they did to the point where I am content. Now I have great performance and great driveability which is important to me.</span></span></p> <p style="text-align: left"><span style="font-size: 15px"><span style="color: rgb(204, 204, 204)"></span></span></p> <p style="text-align: left"><span style="font-size: 15px"><span style="color: rgb(204, 204, 204)">The disadvantage that earlier cars have is that we don't have widebands working with the PCM to constantly regulate air/fuel ratio under all conditions, and the data they provide in a datalog. I have heard VMP say that they won't "remote tune" a car without wideband data, and I believe that Lund Racing requires the same, hence the ZT-2 datalogging package that works with NGauge.</span></span></p> <p style="text-align: left"><span style="font-size: 15px"><span style="color: rgb(204, 204, 204)"></span></span></p> <p style="text-align: left"><span style="font-size: 15px"><span style="color: rgb(204, 204, 204)">I recommend installing a wideband sensor and gauge so that you can monitor A/F ratio, and I recommend a dyno tune with a reputable GT500 Tuner to get the best results with driveability and power.</span></span></p></blockquote><p></p>
[QUOTE="SCGallo2, post: 16432865, member: 160791"] Pleasure doing business with you Sir. Just a little clarification... I have never had any issues with the blower. My early driveability issues were self-inflicted by asking Lund to tune my combination with the Ford Racing/PHP fuel pump assembly with Walbro GSS342 pumps (not recommended in a returnless system) and ID1000s. He said we could try and fueling appeared good on the datalogs so we went with it. My main issue was cold start fueling in open loop operation, my car stumbled during pedal transitions; once at full operating temp and in closed loop fueling the car drove great under normal conditions and ran strong. Lund didn't see this as a big issue and wasn't interested in trying to resolve it. A second issue was transitions from 1st gear on boost to off boost and then back on the gas, my car would stumble when fuel pressure fluctuated, again which I can relate to the fuel pumps not liking to be switched on and off. I never brought this issue to Lund's attention because it happened so infrequently, but it bothered me. [left][size=4][color=rgb(204, 204, 204)]When I decided to switch Tuners, I contacted JDM and we discussed my setup and driveability issues. They wanted me to return the fuel pump assembly back to stock before they tuned it, which I did. I planned on taking the car to them for a dyno and drive tune. In the meantime, they sent me a basic startup and drive tune so I could drive the car and it ran pretty good. I still had a little cold start open loop fueling stumble during pedal transitions, but it was better. When I dropped the car off with them, I asked them to work on cold start fueling and they did to the point where I am content. Now I have great performance and great driveability which is important to me. The disadvantage that earlier cars have is that we don't have widebands working with the PCM to constantly regulate air/fuel ratio under all conditions, and the data they provide in a datalog. I have heard VMP say that they won't "remote tune" a car without wideband data, and I believe that Lund Racing requires the same, hence the ZT-2 datalogging package that works with NGauge. I recommend installing a wideband sensor and gauge so that you can monitor A/F ratio, and I recommend a dyno tune with a reputable GT500 Tuner to get the best results with driveability and power.[/color][/size][/left] [/QUOTE]
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