Nor_Cal_Crawler
Newbie
Have some questions for the tuning wizards out there. I have a fairly worthy monster under the hood. Nothing insane by any means. 383 n.a at 512hp and 500tq being fed by a holley sniper 4150. It seems to run okay, wont idle below 1k without dying once warm. Hard for me to know 100 percent as ive never dealt with a performance motor before. It rips pretty good but im having some problems at WOT. It seems to bog out when i put it to the wood. Also sounds like it chirps a little but not at the tires, from the engine bay, when i mash the throttle as well. Belt slipping under the power? Clutch slipping?
I went through the snipers wizard a second time, updated the ECU firmware to current, and i downloaded the tune that it generates into my computer and grabbed the holley software from the website. I have never done any fuel mapping or engine tuning of any kind before but id like to dive right in. I have been told i should be running 13.5 to 14.5 AFR at idle, around 13 at cruise, and 12 or 12.5 at WOT. So i made those adjustment on the handheld and it didnt make any difference when driving. The changes were also only slightly off the defaults.
Anyhow because i am sure someone is bound to ask for some of my engine specifics heres a list of what im using:
Holley Sniper 4150 w/ 3/8 feed and return line, built in pressure regulator on unit, 10 micron inline filter, holley pump in factory sending unit
MSD Streetfire HEI dist, no timing adjusment at all just set at 16-BTDC
383 w/ 5.7in rod length, 4.03in bore, 3.75in stroke
Liberty Heads - 110cc, 180psi crank compression, 200cc intake, 140cc exhaust
Weiand Intake rated @ 850cfm
Taylor Wires...... i have a set of Accel 9020c ceramic wires incase my taylors melt. They are EXTREMELY close to my shorty headers. I dont know if the Taylors are spiral wound or not, although i dont think that should make much of a difference in my scenario. The Accel wires are, however.
Lunati Cam - INTAKE: Ratio- 1.5:1
Valve Diameter: 2.02 inches
Seat pressure: 125psi
Open pressure: 395psi
Lift: 0.560 inches
Duration: 295 degrees
Exhaust: Ratio- 1.5:1
Valve Diameter: 1.6 inches
Seat Pressure: 125psi
Open Pressure: 395psi
Lift: 0.565 inches
Duration: 303 degrees
So that might all be TOO much information, but better than not enough lol
I dont know where to start making adjustments. Im comfortable poking around in the software with some guidance but the videos I am able to find on youtube are situation specific and nothing that really glosses over the general theory of computer tuning.
Help would be greatly appreciated. I am open to phone calls, discord chat, video calls or whatever as i realize some things might be difficult to explain long hand in a forum, i just want to get this thing running ****.
Thank you
I went through the snipers wizard a second time, updated the ECU firmware to current, and i downloaded the tune that it generates into my computer and grabbed the holley software from the website. I have never done any fuel mapping or engine tuning of any kind before but id like to dive right in. I have been told i should be running 13.5 to 14.5 AFR at idle, around 13 at cruise, and 12 or 12.5 at WOT. So i made those adjustment on the handheld and it didnt make any difference when driving. The changes were also only slightly off the defaults.
Anyhow because i am sure someone is bound to ask for some of my engine specifics heres a list of what im using:
Holley Sniper 4150 w/ 3/8 feed and return line, built in pressure regulator on unit, 10 micron inline filter, holley pump in factory sending unit
MSD Streetfire HEI dist, no timing adjusment at all just set at 16-BTDC
383 w/ 5.7in rod length, 4.03in bore, 3.75in stroke
Liberty Heads - 110cc, 180psi crank compression, 200cc intake, 140cc exhaust
Weiand Intake rated @ 850cfm
Taylor Wires...... i have a set of Accel 9020c ceramic wires incase my taylors melt. They are EXTREMELY close to my shorty headers. I dont know if the Taylors are spiral wound or not, although i dont think that should make much of a difference in my scenario. The Accel wires are, however.
Lunati Cam - INTAKE: Ratio- 1.5:1
Valve Diameter: 2.02 inches
Seat pressure: 125psi
Open pressure: 395psi
Lift: 0.560 inches
Duration: 295 degrees
Exhaust: Ratio- 1.5:1
Valve Diameter: 1.6 inches
Seat Pressure: 125psi
Open Pressure: 395psi
Lift: 0.565 inches
Duration: 303 degrees
So that might all be TOO much information, but better than not enough lol
I dont know where to start making adjustments. Im comfortable poking around in the software with some guidance but the videos I am able to find on youtube are situation specific and nothing that really glosses over the general theory of computer tuning.
Help would be greatly appreciated. I am open to phone calls, discord chat, video calls or whatever as i realize some things might be difficult to explain long hand in a forum, i just want to get this thing running ****.
Thank you