This is concerning my brother's 87 GN. When he shuts off his car the fuel pressure drops to zero and when he cranks to start it, it takes a little longer for it to fire up because the fuel lines are empty. I was wondering if the check valve stays opened on the fuel pump , does this hurt performance? The fuel pressure at idle is 42 (vacuum on) and when the car is floored the fuel pressure goes past 70 psi. His car most of the time always gets KR off take off, something like this ( 38-19-6-0) on the otc 4000e, but after take off it drops back to zero for the rest of h 1/4 of a mile. The same thing happens off a roll on take off, except the car feels worse, as if something is holding back and as soon as it shifts in 3rd it takes off like a bullet.
Any replies will be appreciated, thanks Marco.
My brother’s 87 Grand National t-top (92 000 km)
Stock block with trw pistons and 30 over, stock heads, 210-205 lunati cam, PT61 Turbo, 65 mm kenne bell TB and plenum, 9 inch 3000-3200 stall art carr convertor, 22 ½ boost, 94 octane with 100% methanol with smc alk injection, thdp, hooker 2 ½ exhaust, 42 ½ lbs injectors, Armstrong 100 chip, ESP front mount IC, 26 BY 10 M/T ET STREEET TIRES, 3800 LBS race weight.
BEST ET= 1.60 60FT- 7.47 1/8- 11.80 ET-113 MPH
BEST MPH= 1.72 60FT – 11.87 ET AT 114,74 MPH
My 86 Grand National t-top (59900km)
stock long block,stock suspension, red stripe convertor, te44, smc alk injection, 24lbs boost, 94 octane, hooker cat back with dyno max ultra flow muffers, tomco 30lbs injectors, dynotech stage 4 street chip, thdp, mease 24 row IC, Ron Custom max boost brake module, MT drag radials (275/50/15) 3800lbs race weight with driver.
BEST E/T
60FT=1.52
1/8= 7.38
I/4= 11.74
MPH=113 BEST MPH=114
Any replies will be appreciated, thanks Marco.
My brother’s 87 Grand National t-top (92 000 km)
Stock block with trw pistons and 30 over, stock heads, 210-205 lunati cam, PT61 Turbo, 65 mm kenne bell TB and plenum, 9 inch 3000-3200 stall art carr convertor, 22 ½ boost, 94 octane with 100% methanol with smc alk injection, thdp, hooker 2 ½ exhaust, 42 ½ lbs injectors, Armstrong 100 chip, ESP front mount IC, 26 BY 10 M/T ET STREEET TIRES, 3800 LBS race weight.
BEST ET= 1.60 60FT- 7.47 1/8- 11.80 ET-113 MPH
BEST MPH= 1.72 60FT – 11.87 ET AT 114,74 MPH
My 86 Grand National t-top (59900km)
stock long block,stock suspension, red stripe convertor, te44, smc alk injection, 24lbs boost, 94 octane, hooker cat back with dyno max ultra flow muffers, tomco 30lbs injectors, dynotech stage 4 street chip, thdp, mease 24 row IC, Ron Custom max boost brake module, MT drag radials (275/50/15) 3800lbs race weight with driver.
BEST E/T
60FT=1.52
1/8= 7.38
I/4= 11.74
MPH=113 BEST MPH=114