Hi all,
Haven't posted here in quite some time, however I thought I would as this question here in the tuning section, since it seems there are quite a few people around who are familiar with certain aspects of tuning.
My previous combo consisted of: Stock 302 shortblock, GT40X heads, ported cobra intake, E303 cam with 1.72 rockers, full exhaust, D1SC seeing 13psi @6100rpm, ignition, etc. Car made 490rwhp,470ft/lbs on a DynoJet after being tuned at Larocca's many eons ago.
New combo is: Dart 331 with 8.8:1 compression, AFR 185 heads with custom springs to match heads, custom cam ( specs below ), D1SC seeing 12psi @6300rpm, Edebrock RPM II upper/lower, Pro-m protube, 50#injectors, Glenns 1000hp fuel system, 1 3/4 shorty headers with MAC Prochamber and Magnaflow catback 2 1/2".
Cam:
Advertised duration: 274 int 285 exh
Dur @.050: 224 int 232 ext with 114 lobe separation
.574 intake lift, .545 exhaust
Questions:
Car made 511rwhp and 472ft/lbs on a SuperFlow dyno with an 11.1 A/F ratio at peak torque, and climbing to about 11.3 at 6300rpm, with 24 degrees total timing. Apparently the car was picking up 20 hp for every two degrees timing added. ( Although I think this is a bit aggressive for 93 octane )
I would have expected the car to make more power than it did, for what I have put together, especially torque, unless the DynoJet to SuperFlow numbers are that far off? I know that I'm only spinning the blower to 52,000 rpm @ 6300rpm motor, but I would still think it should make quite a bit more? The car feels strong once boost starts to build, and feels stronger than it used to on the previous combo, but the numbers aren't showing.
During the tuning session, the tuner mentioned that my Pro-m 3" protube pegged in voltage at 5V at 5000rpm, yet this meter should not peg at the horsepower I'm making. He mentioned he had to fool the computer into thinking it wasn't pegged.
I called Pro-M, and Chris ( Tech who works there ) that the 50# injectors I have, most likely are the culprit, and the meter is receiving the readings from the injectors being maxed or nearly maxed. Hmm.. Therefore, I'm not certain what to believe?
Finally, the car runs pretty rough when you first start it, then smooths out after about 30 seconds of idling. The check engine light comes out, and I believe it is due to me removing the EGR before I took the car in for a tune. The tuner suggests that they removed the EGR function, however, I'm not so sure this is the case. Would the symptoms of not having an EGR be rough cold start, and a check engine light?
Thanks in advance for your input.
Haven't posted here in quite some time, however I thought I would as this question here in the tuning section, since it seems there are quite a few people around who are familiar with certain aspects of tuning.
My previous combo consisted of: Stock 302 shortblock, GT40X heads, ported cobra intake, E303 cam with 1.72 rockers, full exhaust, D1SC seeing 13psi @6100rpm, ignition, etc. Car made 490rwhp,470ft/lbs on a DynoJet after being tuned at Larocca's many eons ago.
New combo is: Dart 331 with 8.8:1 compression, AFR 185 heads with custom springs to match heads, custom cam ( specs below ), D1SC seeing 12psi @6300rpm, Edebrock RPM II upper/lower, Pro-m protube, 50#injectors, Glenns 1000hp fuel system, 1 3/4 shorty headers with MAC Prochamber and Magnaflow catback 2 1/2".
Cam:
Advertised duration: 274 int 285 exh
Dur @.050: 224 int 232 ext with 114 lobe separation
.574 intake lift, .545 exhaust
Questions:
Car made 511rwhp and 472ft/lbs on a SuperFlow dyno with an 11.1 A/F ratio at peak torque, and climbing to about 11.3 at 6300rpm, with 24 degrees total timing. Apparently the car was picking up 20 hp for every two degrees timing added. ( Although I think this is a bit aggressive for 93 octane )
I would have expected the car to make more power than it did, for what I have put together, especially torque, unless the DynoJet to SuperFlow numbers are that far off? I know that I'm only spinning the blower to 52,000 rpm @ 6300rpm motor, but I would still think it should make quite a bit more? The car feels strong once boost starts to build, and feels stronger than it used to on the previous combo, but the numbers aren't showing.
During the tuning session, the tuner mentioned that my Pro-m 3" protube pegged in voltage at 5V at 5000rpm, yet this meter should not peg at the horsepower I'm making. He mentioned he had to fool the computer into thinking it wasn't pegged.
I called Pro-M, and Chris ( Tech who works there ) that the 50# injectors I have, most likely are the culprit, and the meter is receiving the readings from the injectors being maxed or nearly maxed. Hmm.. Therefore, I'm not certain what to believe?
Finally, the car runs pretty rough when you first start it, then smooths out after about 30 seconds of idling. The check engine light comes out, and I believe it is due to me removing the EGR before I took the car in for a tune. The tuner suggests that they removed the EGR function, however, I'm not so sure this is the case. Would the symptoms of not having an EGR be rough cold start, and a check engine light?
Thanks in advance for your input.
