Hitting low 12's?!!!!!
Intermediate
Joined: Mar 2003
Posts: 46
Likes: 0
From: PA NJ
#1, ditch the TPI for a miniram or a converted LT1 intake (was also a former third gen'r, I've spent more $$$ trying to get the TPI hopped up than I would have spent on a full Mini Ram setup).
#2 a compcams cc-304 (mild,sleeper) or cc-305 (still idles good, just a slight lump) --> replace the valve springs
#3 comp cams pro magnum roller rockers
#4 chip for ecm - the cc304 will be fine with the stock TPI, but intake change would need a complete re tune
#5 17x11 A-Molds for the rear with 315-35 Nitto drags
Try those first should get you in the high 12's.
THe biggest problem is the TPI with the L98. As far as exhaust, full lengths seem to be the consensus. To me, cat back is not a big power adder for the displacement of the motor and stock heads, just noise; get a factory LT1 cat back from ebay. Stock ignition components are fine. Avoid bolt ons, put that money towards getting your heads ported.
#2 a compcams cc-304 (mild,sleeper) or cc-305 (still idles good, just a slight lump) --> replace the valve springs
#3 comp cams pro magnum roller rockers
#4 chip for ecm - the cc304 will be fine with the stock TPI, but intake change would need a complete re tune
#5 17x11 A-Molds for the rear with 315-35 Nitto drags
Try those first should get you in the high 12's.
THe biggest problem is the TPI with the L98. As far as exhaust, full lengths seem to be the consensus. To me, cat back is not a big power adder for the displacement of the motor and stock heads, just noise; get a factory LT1 cat back from ebay. Stock ignition components are fine. Avoid bolt ons, put that money towards getting your heads ported.
Thread Starter
Racer
Joined: Jan 2009
Posts: 312
Likes: 0
From: Waynesville OH
If i go with a LT1 intake do i have to swap heads? Then also i know on newer cars tuning the computer can do alot how about on our cars?
Also i dont think it has stock exhaust system. I was just wondering if they have any sensors on the cat or cats? I would like to take them off for now and have it sounding alittle better. My 90 camaro didnt but i dont know about theses?
thanks
kevin
Also i dont think it has stock exhaust system. I was just wondering if they have any sensors on the cat or cats? I would like to take them off for now and have it sounding alittle better. My 90 camaro didnt but i dont know about theses?
thanks
kevin
Last edited by 19Beast90; Aug 10, 2009 at 02:49 PM.
Pro
Joined: Jan 2003
Posts: 515
Likes: 3
From: newark DE
Oh boy here comes another " factory freak" story
OP-14s stock, 13s if you do every bolt on/free mod inthe book, thats it. Low 12s you will be spending tons of cash, period. Sell taht cam too, it wont work with what you have
OP-14s stock, 13s if you do every bolt on/free mod inthe book, thats it. Low 12s you will be spending tons of cash, period. Sell taht cam too, it wont work with what you have
throwing parts and $$ at a car and hoping itll go fast wont cut it with TPI. patience, practice, and experience will
What "bolt ons" are going to take a stock 86 into low 13's?
- cut filter lid w K&N
- airfoil
- TB bypass
- ported plenum
- AFPR set at 48psi (vac hose disconnected)
- base timing set at 9* BTDC
- MAD front ypipe
- flowmaster catback
- DRs
the above mods got me 13.2 at 104mph with a 1.87 60ft at Cecil County Dragway back in Oct 02'. a 86 should only be a tenth or two behind that. add headers, a stall, and some gears and 12s should be easy
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
...
- cut filter lid w K&N
- airfoil
- TB bypass
- ported plenum
- AFPR set at 48psi (vac hose disconnected)
- base timing set at 9* BTDC
- MAD front ypipe
- flowmaster catback
- DRs
the above mods got me 13.2 at 104mph with a 1.87 60ft at Cecil County Dragway back in Oct 02'. ...
- cut filter lid w K&N
- airfoil
- TB bypass
- ported plenum
- AFPR set at 48psi (vac hose disconnected)
- base timing set at 9* BTDC
- MAD front ypipe
- flowmaster catback
- DRs
the above mods got me 13.2 at 104mph with a 1.87 60ft at Cecil County Dragway back in Oct 02'. ...
Not a factory freak, just a lot of trial and error in perfecting the combination that i had at the time.
Pro
Joined: Jan 2003
Posts: 515
Likes: 3
From: newark DE
That is almost the exact recipe used on my '85 bolt on Vette to get very low 13s. Except I had underdrive pulleys, offroad pipe, and 1.6 roller rockers, and my track is basically at sea level.
Not a factory freak, just a lot of trial and error in perfecting the combination that i had at the time.
Not a factory freak, just a lot of trial and error in perfecting the combination that i had at the time.
my car had an offroad ypipe as well. the MAD front ypipe i mentioned in my list was a 2.5" replacement for 86 - 91 corvettes that deleted the precats
Thread Starter
Racer
Joined: Jan 2009
Posts: 312
Likes: 0
From: Waynesville OH
sorry to ask but i have a few questions about some of the stuff. I dont know what you are talking about when you say airfoil and DRs? Then i know what the tb is but what bypass? Then last you said "AFPR set at 48psi (vac hose disconnected)" what dose that help and why?
thanks alot
kevin
thanks alot
kevin
Pro
Joined: Jan 2003
Posts: 515
Likes: 3
From: newark DE
an airfoil is a small part that goes between the throttle bores to smooth out airflow on the stock throttle body. power gain is debateable, but ive always had one on my Vettes. figure it cant hurt
http://www.summitracing.com/parts/SLE-22100/
DRs = Drag Radials. youre gonna need some sticky tire to get good E/T. I personally favor Mickey Thompson ET Street drag radials. for stick cars tho, slicks would be better
AFPR set at 48psi with vac hose disconnected = Adjustable Fuel Pressure Regulator. its a part found under the TPI plenum that controls fuel pressure. stock ones are not adjustable. aftermarket parts allow you to control the fuel pressure. disconnecting the vacuum hose at idle simulates WOT fuel pressures. this is the setting you make adjustments at
TB bypass = GM piped coolant into the throttle body to prevent icing on the throttle plates in cold climates. bypassing the TB coolant prevents hot antifreeze from heating up your intake manifold a bit when driving. thought to produce a bit of extra power, or at least more consistancy between runs. theres a hose on each side of the TB... to do the bypass, you disconnect the hoses from the TB and connect them with a tube
if you have any other questions, feel free to ask
http://www.summitracing.com/parts/SLE-22100/
DRs = Drag Radials. youre gonna need some sticky tire to get good E/T. I personally favor Mickey Thompson ET Street drag radials. for stick cars tho, slicks would be better
AFPR set at 48psi with vac hose disconnected = Adjustable Fuel Pressure Regulator. its a part found under the TPI plenum that controls fuel pressure. stock ones are not adjustable. aftermarket parts allow you to control the fuel pressure. disconnecting the vacuum hose at idle simulates WOT fuel pressures. this is the setting you make adjustments at
TB bypass = GM piped coolant into the throttle body to prevent icing on the throttle plates in cold climates. bypassing the TB coolant prevents hot antifreeze from heating up your intake manifold a bit when driving. thought to produce a bit of extra power, or at least more consistancy between runs. theres a hose on each side of the TB... to do the bypass, you disconnect the hoses from the TB and connect them with a tube
if you have any other questions, feel free to ask
Last edited by tpivette; Aug 11, 2009 at 01:29 PM.
Thread Starter
Racer
Joined: Jan 2009
Posts: 312
Likes: 0
From: Waynesville OH
Ok well thanks for all of your guys help. I was thinking about going with some new rims but i dont know if i would like 17's or 18's? Then what a good tire for the best money? Also would rim size mess with any of the Z51 parts?
thanks
kevin
thanks
kevin
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Thread Starter
Racer
Joined: Jan 2009
Posts: 312
Likes: 0
From: Waynesville OH
Well today i got it and drove it around alot! deffently awsome! I never knew having a manual with 70 more hp and like 70 more pounds a torque would do so much! I shifted into 2nd easy and was going about 20-25 and hit it and it started burning out so i let off real quick lol. I dont think i need any more hp for a while. Atleast in 1st and 2nd, 3rd and 4th i would like to have more though.
kevin
kevin
