90' Corvette Modified
Thread Starter
Tech Contributor
Joined: Sep 2009
Posts: 1,285
Likes: 91
From: South Dakota/California
90' Corvette Modified
90’ Corvette (L98) Modifications (285 HorsePower)
New SW Headers
New Magnaflow Exhaust
New TPiS Air pump delete kit
New 180 deg thermostat
New Plug wires
New C4 Beam Plates
New Differential oil drain plug (drilled and tapped)
New Differential oil drain plug
New Billet Aluminum oil cap
Fluids Mobile 1 75W-90 Differential oil (limited slip)
Fluids Mobile 1 5W-30 synthetic Engine oil
Fluids Castrol TWS 10W-60 Transmission oil
Eliminated Air Induction system
Eliminated CATS
Eliminated EGR
Modified Oil Cooler Use NAPA 8020 and 9808 hoses cut to length
Modified Marc Haibeck Chips
....87 octane calibration.
....OE spark timing 23 + 6 = 29 degs. @ 4400 rpm. 24 + 6 = 30degs. @ 5000 rpm.
....Enabled manual transmission.
....Both fans to go on at 195 and both off at 190 degs.
....Added +5% at WOT fuel to support +20 hp.
....Disabled deceleration fuel cut off.
....Disabled EGR.
....Idle speed is OE at 600 rpm.
....91 octane calibration.
....OE spark timing 23 + 6 = 29 degs. @ 4400 rpm. 24 + 6 = 30degs. @ 5000 rpm.
....Enabled manual transmission.
....Both fans to go on at 195 and both off at 190 degs.
....Added +10% at WOT fuel to support +40 hp.
....Disabled deceleration fuel cut off.
....Disabled EGR.
....Idle speed is OE at 600 rpm.
....Knock retard reduced by 50%.
This is a 1990 (L98) with SW Headers, Magnaflow exhaust and ZF S6-40 Transmission. The modifications include eliminated air pump, eliminated EGR, Haibeck Chip and some other stuff (over 100 mph in the quarter). http://vexer.com/automotive-tools/1-...MPH-calculator
Had to modify the oil cooler a bit so it could be rotated. The oil cooler coolant hoses then cleared the SW headers with sufficient air gap.
New SW Headers
New Magnaflow Exhaust
New TPiS Air pump delete kit
New 180 deg thermostat
New Plug wires
New C4 Beam Plates
New Differential oil drain plug (drilled and tapped)
New Differential oil drain plug
New Billet Aluminum oil cap
Fluids Mobile 1 75W-90 Differential oil (limited slip)
Fluids Mobile 1 5W-30 synthetic Engine oil
Fluids Castrol TWS 10W-60 Transmission oil
Eliminated Air Induction system
Eliminated CATS
Eliminated EGR
Modified Oil Cooler Use NAPA 8020 and 9808 hoses cut to length
Modified Marc Haibeck Chips
....87 octane calibration.
....OE spark timing 23 + 6 = 29 degs. @ 4400 rpm. 24 + 6 = 30degs. @ 5000 rpm.
....Enabled manual transmission.
....Both fans to go on at 195 and both off at 190 degs.
....Added +5% at WOT fuel to support +20 hp.
....Disabled deceleration fuel cut off.
....Disabled EGR.
....Idle speed is OE at 600 rpm.
....91 octane calibration.
....OE spark timing 23 + 6 = 29 degs. @ 4400 rpm. 24 + 6 = 30degs. @ 5000 rpm.
....Enabled manual transmission.
....Both fans to go on at 195 and both off at 190 degs.
....Added +10% at WOT fuel to support +40 hp.
....Disabled deceleration fuel cut off.
....Disabled EGR.
....Idle speed is OE at 600 rpm.
....Knock retard reduced by 50%.
1990 Corvette (L98)
This is a 1990 (L98) with SW Headers, Magnaflow exhaust and ZF S6-40 Transmission. The modifications include eliminated air pump, eliminated EGR, Haibeck Chip and some other stuff (over 100 mph in the quarter). http://vexer.com/automotive-tools/1-...MPH-calculator
Had to modify the oil cooler a bit so it could be rotated. The oil cooler coolant hoses then cleared the SW headers with sufficient air gap.
Last edited by Dynomite; Jan 3, 2012 at 12:30 PM.
Thread Starter
Tech Contributor
Joined: Sep 2009
Posts: 1,285
Likes: 91
From: South Dakota/California
Disabling DFCO will help prevent engine stalling on deceleration and maintain the nice rumble like the BIG boys.
On vehicles with standard transmissions (ZF S6 40 for example) with modified engines DFCO can be rather harsh during shifting. In these cases disabling DFCO is Obvious as you suggest.
Last edited by Dynomite; Aug 6, 2012 at 04:36 PM.
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Nice car. Just a suggestion. You seem to be interested in obtaining the best possible performance from your setup. Why not tune for 91 octane, bump up the advance a couple or 3 degrees and gain some free horsepower? Willie
Thread Starter
Tech Contributor
Joined: Sep 2009
Posts: 1,285
Likes: 91
From: South Dakota/California
Last edited by Dynomite; Dec 28, 2011 at 11:48 PM.
Heel & Toe
Joined: Feb 2009
Posts: 18
Likes: 0
From: Albuquerque New Mexico
Is this possible with an 84? If so exactly how is it done?
Thread Starter
Tech Contributor
Joined: Sep 2009
Posts: 1,285
Likes: 91
From: South Dakota/California
91 Octane Chip
Marc Haibeck is doing a 91 Octane chip for me as we speak for my 1990 (L98). I am not sure about an 1984 but Marc would know
http://www.zr1specialist.com/
Just like Willie suggests below. Marc bumps up the timing a few degrees on the chip but you then burn 91 Octane.
http://www.zr1specialist.com/
Just like Willie suggests below. Marc bumps up the timing a few degrees on the chip but you then burn 91 Octane.
Last edited by Dynomite; Jan 3, 2012 at 12:07 PM.
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