Last night something went terribly wrong, I blew the original motor of my 86 gn. I am not a 100% sure but think that the gen 2 was the cause of it. I went on the highway for a test run to see what my wideband numbers were going to be. I had just hooked up my wideband to my gen 2, and I thought I had set it up safe and rich. To get an idea, this is how I set my gen 2.
SET-UP: wideband # 11.5 at all rpm except 11.2 at 4000 rpm and 11.0 at 5000 rpm.
Gain= 4
+ 5% high load at 4600 rpm
+ 10% high load at 5200 rpm
Lean Lim%: - The maximum % that the system will lean out to
maintain the desired A/F. It is advisable to set this around 5%, so the
AFR will not go incredibly lean if there is a problem with the wideband
unit.
Rich Lim%: - The maximum % that the system will richen up to
maintain the desired A/F. This can be fairly high (25%) to help protect
the engine in case of a fuel system partial failure.
Boost 25 to 26
Timming 23/21
When I floored the car from 60 mph to 110 mph, check this out, the ls1 maf showed a max reading of 130. What readings do you guys see when you floor the car with an LS1 maf? Anyways the car ran extremely lean and
these are some of the numbers. 4300 rpm= a/f= 14.2 5300 rpm= a/f= 13.0, 0kr, o2= .76, EGT= 1768. With the same boost and timming with my turbotweak chip and stock maf these were my readings. 4300 rpm= a/f= 12.2 5300 rpm=a/f= 11.6, 0 kr, o2= .79, EGT= 1748 and my stock maf always read 255 at wide open throttle. Was trying to tune my car richer to bring down my EGT with the gen 2 but my stock motor knocks now.
Need your help and advice on what you guys think went wrong. I don't want to rebuild my motor and for the same thing to happen again.
Thanks alot for any help I can get.
Marco.
T-Top 86 Grand National 62000 km)
stock long block, stock suspension, 12 inch red stripe convertor (2800stall), te44, smc alk injection (95 % etanol), 25.5lbs boost,( boost spike 28 psi in 1st gear), 94 octane, hooker cat back with dyno max ultra flow muffers, 42 ½ lbs 009 injectors, turbotweak alky chip with 23/21 timing, thdp, mease 24 row IC, Ron Custom max boost brake module, MT drag radials (275/50/15) 3720lbs race weight with driver. (Torque convertor locked only after car shifted in third), rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, comp cam 980 valve springs. Weld Drag Lites with skinnies up front, electric exhaust cut-out.
BEST E/T
60FT=1.53
1/8= 7.25
1/4= 11.48
MPH=120.82
BEST 60FT=1.52
SET-UP: wideband # 11.5 at all rpm except 11.2 at 4000 rpm and 11.0 at 5000 rpm.
Gain= 4
+ 5% high load at 4600 rpm
+ 10% high load at 5200 rpm
Lean Lim%: - The maximum % that the system will lean out to
maintain the desired A/F. It is advisable to set this around 5%, so the
AFR will not go incredibly lean if there is a problem with the wideband
unit.
Rich Lim%: - The maximum % that the system will richen up to
maintain the desired A/F. This can be fairly high (25%) to help protect
the engine in case of a fuel system partial failure.
Boost 25 to 26
Timming 23/21
When I floored the car from 60 mph to 110 mph, check this out, the ls1 maf showed a max reading of 130. What readings do you guys see when you floor the car with an LS1 maf? Anyways the car ran extremely lean and
these are some of the numbers. 4300 rpm= a/f= 14.2 5300 rpm= a/f= 13.0, 0kr, o2= .76, EGT= 1768. With the same boost and timming with my turbotweak chip and stock maf these were my readings. 4300 rpm= a/f= 12.2 5300 rpm=a/f= 11.6, 0 kr, o2= .79, EGT= 1748 and my stock maf always read 255 at wide open throttle. Was trying to tune my car richer to bring down my EGT with the gen 2 but my stock motor knocks now.
Need your help and advice on what you guys think went wrong. I don't want to rebuild my motor and for the same thing to happen again.
Thanks alot for any help I can get.
Marco.
T-Top 86 Grand National 62000 km)
stock long block, stock suspension, 12 inch red stripe convertor (2800stall), te44, smc alk injection (95 % etanol), 25.5lbs boost,( boost spike 28 psi in 1st gear), 94 octane, hooker cat back with dyno max ultra flow muffers, 42 ½ lbs 009 injectors, turbotweak alky chip with 23/21 timing, thdp, mease 24 row IC, Ron Custom max boost brake module, MT drag radials (275/50/15) 3720lbs race weight with driver. (Torque convertor locked only after car shifted in third), rjc power plate, rjc boost controller, zeitronix wideband, HR motor mounts, comp cam 980 valve springs. Weld Drag Lites with skinnies up front, electric exhaust cut-out.
BEST E/T
60FT=1.53
1/8= 7.25
1/4= 11.48
MPH=120.82
BEST 60FT=1.52
