My current set up on my 1987 gn is, i have a prescision ptb 6152 turbo, stock heads, stock location stretched intercooler,delphi 50lb injectors,walbro 255 pump, th 3inch down pipe, comp 980 valve springs, stock cam, 200r4 tranny,ptc 10 inch 3200 to 3400 converter, eric marshall turbo tweek chip set up for 110 race gas 26 degrees of timing 25lbs of boost, im using ac delco r42ts plugs, adjustable regulator fuel pressure set at 43psi with the line off and 40 with the line on at idle at wot my fuel pressure gauge reads 80 psi my mv on the scanmaster all the way through the quarter mile is 800 with 0 retard my timeslips of my pass is 12.31 @ 108, 60ft 1.78, 1/8 mile 7.82@ 87.82,what do i have wrong or is this all i can get out of this set up??????
!!!! where is my mph???? im thinking i should be faster than 12.25 et
- Thread starter mysem9
- Start date
big reazon
Member
- Joined
- Nov 12, 2006
Whats your converter slip percent look like. Are you locking the converter of is it a non lock up?
You have something seriously wrong. At 25PSI that turbo should have at least broken the 11's. At least it better have that capability, or my plans are going to be disappointing. I am guessing the fueling has nothing to do with it considering you had 800MVs, no knock at WOT.
I'm gonna agree with Bryan here. There's more to the car that isn't being told. The 60' needs quite a bit of work so my guess is a traction issue along with some other issues. Tire size, pressure, boost on the line before launch?
Something has to be way off in that tune/setup! To be only running low 12's with everything you've indicated. You've got for more turbo than I do, less intercooler, same injectors, but all the other stuff is similar, like fuel, timing, boost, etc. and you're running very rich. But..... you should be in the 11.6's anyway, and 115mph, or 117 if you can lock the TCC at around 80mph.
i would advise getting a wideband on the car,and as asked what fuel is being used.800's wot with say 116 octane is way rich,and will kill the power all the way through the run starting with the 60ft.i have tuned race gas down to 690's-720's back in the day and the car dropped from 12.20's to 11.80's.its so much easier to see the tune in real time with the wideband.
big reazon
Member
- Joined
- Nov 12, 2006
said hes running 110 octane in the first post
Phoneguy
Cometic HG stress tester
- Joined
- Aug 27, 2002
He didnt say what fuel , just that the chip is burned for 110.
big reazon
Member
- Joined
- Nov 12, 2006
yep my bad
I just noticed that your set up is very close to what mine was in 2007. My car ran consistent 12.30's at 108. I ran spprtsman pros, stall wass 3000. The converter sucked, tranny was strong. Looking back i should have focused more on my transbrake and ran a taller tire. I had the power to be in the low 11's or sooner. Driving skill wasnt there.
jasjamz
THS Racer
- Joined
- Sep 30, 2004
X2. If you are seeing 800 on the scanmaster through the traps its even richer in 1st and 2nd gear. Sweet6 touched on all the points I would look into. Do you have a way to see what the RPM was at the finish line?
- Joined
- Aug 1, 2003
"..adjustable regulator fuel pressure set at 43psi with the line off and 40 with the line on at idle at wot my fuel pressure gauge reads 80 psi.."
80 psi fuel pressure at WOT ..
so either you're running 37lbs of boost
or your base fuel pressure base setting is 55psi
or your gauge is fubar
which is it ???
set the base FP to 43psi line off (use a fuel gauge known to be accurate )
it should rise one to one under boost so at 25 psi boost you should see 68psi fuel pressure
80 psi fuel pressure at WOT ..
so either you're running 37lbs of boost
or your base fuel pressure base setting is 55psi
or your gauge is fubar
which is it ???
set the base FP to 43psi line off (use a fuel gauge known to be accurate )
it should rise one to one under boost so at 25 psi boost you should see 68psi fuel pressure