TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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I ran a 14.87 @ 90.95 mph on my original 305 (peanut cam) with a ported plenum, Hooker 2055 headers, cat-back exhaust, 2200 stall converter, 3.42 gears/posi, and burning my own chip. I didn't have an air pump or cat, but did have the A/C hooked up and running (not at the track of course).
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15.1 @93 mph , with 227'000 km's on a hot day about 1000 ft above sea level. With MAJOR blow by. ( kicked off track for spewing oil out the dipstick) .
Forgot to add it was a 5 speed with 3.08 LSD
__________________ PROJECT UGLY DUCKLING
1989 10:1 353 L98Edlebrock base and runners ( really ported)ZZ4cam ,1 3/4 SLP shorties 083 heads ...cleaned up andstuded w/1.52 rr , LT4 valve springs and retainers and a 3 angle valve job
suspension mods (Hotchkis LCA's PH bar, KYB shocks and struts)
T-5 3.73
T-62 turbo to be installed next ...Exhaust clip ...gota let it load.... http://media.putfile.com/My-exhaust-clip
Last edited by D's89IROCZ; 12-06-2006 at 01:03 PM.
i ran a 13.94 at 98mph in my 89 305 tpi formula i have an slp cold air box mac headers no cat no a.i.r and a descreend maf its a 5spd with 3.45 gears ina 9 bolt
That's pretty fast. No porting, heads, or cam? What were you getting for 60' times? All stock suspension/drag radials? That 5pd and 3.45 gears must make the difference. -Nick.
Andy
Im thinking with headers and a better Y-pipe you could break into the 14's...
Nick
Thanks for the info, debating whether to slap some 3.08's or just rebuild the rear end and put 3.23's.
Hey Lucid. Next year I am likely going to install a Magnaflow cat, new AC Delco CR45TS plugs, learn how to do some tuning, and fix my intake manifold leak. Then I think I should run a 14.8. Once I've done that, I'm probably done modding my 91 GTA.
I bought a 92 GTA 350 TPI from California in September that I am in the process of fixing up and I am going to do a few mods to it too. Right now it is bone stock, it even has a paper air filter.
Andy
That sounds good, get the biggest cat you can fit on there (make sure its a high flow one), i have 3" exhaust starting with/from the Cat going to the big Borla muffler. The 305 engine is also very sensitive to timing. With the timing at around 0 deg base, i was running 16.8 in the quarter, and bumping it up to 10 deg base at the track, i dropped it down to 16.2.
Good luck with the GTA
__________________ ~Lucid is a state of mind~
Boxed Panhard Rod and LCA's
KYB Struts and Shocks
3" Catalytic Convertor/Borla Exhaust
140 Amp CS144 Alternator
Ramchargers Dual Fans 2500CFM http://www.SA3GO.com
my '87 LB9 iroc runs 15.5 @88.2. i have managed a 2.16 '60 foot time, hooks up good but doesnt pull hard. all i have done to it is a TPIS airfoil and a GMS adjustable MAF sensor.
