LT1 POWR's turbo build
03-26-2010, 06:28 PM
#1
Registered User
Thread Starter
Join Date: Feb 2002
Location: Bridgewater, MA
Posts: 5,645
LT1 POWR's turbo build **Dyno Numbers Added**
***Update***
Edit... just talk to Travis and he got some preliminary numbers:
A/F right around 12.0
timing only @ 17 degrees (which is low for an LTx. I told him to turn it up to 24-26 degrees, but start @ 21/22 degrees and see how it reacts as he goes up).
91 octane doesn't help...
495hp 491ft/lbs @ 7psi thru an AUTO
I think with more timing he should be right @ 550rwhp @ 7psi.
Updated numbers @ 10psi: 602rwhp/602rwtq
__________________________________________________ __________________________________________________ ________________________
96 Z28 with the following mods:
224/224 .577/.582 114 LSA
This is the MAF I'm using, but mine is all aluminum. It has the IAT sensor built in. This website has tables for tuning,
http://www.powrmax.com/PowrMAF%20100.html
I don't know what boost I'll be at, anywhere from 10-15psi from what I'm told. I'm not looking for a particular hp or ET or boost level, so whatever springs I'm using now will be fine for a while.
I'm using a LT1 style monoblade throttle body with the LT1 style IAC and TPS sensors. I have a 3 bar MAP sensor.
I have an adjustable fuel pressure regulator set to about 42 psi at idle. Twin in-tank walbro 255lph fuel pumps, one set to come on at about 5-6 psi. Fuel injectors are Siemen Deka 80lb high impedance injectors.
Ignition is a LSI PCM with D585 truck coils (lower dwell time) and MSD wires with iridium spark plugs gapped at .031"
Rockers are crower 1.65.
Springs are Comp 26094-16. Seat load: 178lbs @1.900''_Open load: 459lbs @1.275_Rate: 449lbs/in
I'm using LS7 lifter with about .00416" preload.
Fans are Flex Lite 410's.
Tranny is a built 4L60E with a 2800 stall.
Rear end is a 12 bolt with 4.11 gears.
Compression ratio should be around 9.2:1.
General Engine Specs
1997 .030" over 350 LT1 out of a Pontiac Firebird
230cc Brodix LT1 Cylinder Heads w/62cc Chambers
Fully CNC ported intake/exhaust/combustion chambers
Cometic "MLS" Head Gaskets
ARP Undercut Head and Main Studs
CP Pistons & Pins - 24cc Dish (Approx. 9.0:1 comp ratio with 62cc heads and .040 gasket)
Total Seal Piston Rings
Manley 5.700" H-Beam Connecting Rods
Callies Billet Steel Splayed 4 Bolt Main Bearing Caps
Callies "Stealth" 4340 3.75" Stroke Crankshaft - Internally Balanced
Fluidampr 7.5 o.d. internal balance 740101
Cloyes Double Roller Timing Chain
Canton Road Race Oil Pan, Melling High Volume (10%) Pump Mel-10552, and Canton Pickup
Trickflow 7.3" Chromemoly One Piece Pushrods TFS-21407300
__________________________________________________ __________
I am going to post build pics along the way.
Driver's Header tacked
Edit... just talk to Travis and he got some preliminary numbers:
A/F right around 12.0
timing only @ 17 degrees (which is low for an LTx. I told him to turn it up to 24-26 degrees, but start @ 21/22 degrees and see how it reacts as he goes up).
91 octane doesn't help...
495hp 491ft/lbs @ 7psi thru an AUTO
I think with more timing he should be right @ 550rwhp @ 7psi.
Updated numbers @ 10psi: 602rwhp/602rwtq
__________________________________________________ __________________________________________________ ________________________
96 Z28 with the following mods:
224/224 .577/.582 114 LSA
This is the MAF I'm using, but mine is all aluminum. It has the IAT sensor built in. This website has tables for tuning,
http://www.powrmax.com/PowrMAF%20100.html
I don't know what boost I'll be at, anywhere from 10-15psi from what I'm told. I'm not looking for a particular hp or ET or boost level, so whatever springs I'm using now will be fine for a while.
I'm using a LT1 style monoblade throttle body with the LT1 style IAC and TPS sensors. I have a 3 bar MAP sensor.
I have an adjustable fuel pressure regulator set to about 42 psi at idle. Twin in-tank walbro 255lph fuel pumps, one set to come on at about 5-6 psi. Fuel injectors are Siemen Deka 80lb high impedance injectors.
Ignition is a LSI PCM with D585 truck coils (lower dwell time) and MSD wires with iridium spark plugs gapped at .031"
Rockers are crower 1.65.
Springs are Comp 26094-16. Seat load: 178lbs @1.900''_Open load: 459lbs @1.275_Rate: 449lbs/in
I'm using LS7 lifter with about .00416" preload.
Fans are Flex Lite 410's.
Tranny is a built 4L60E with a 2800 stall.
Rear end is a 12 bolt with 4.11 gears.
Compression ratio should be around 9.2:1.
General Engine Specs
1997 .030" over 350 LT1 out of a Pontiac Firebird
230cc Brodix LT1 Cylinder Heads w/62cc Chambers
Fully CNC ported intake/exhaust/combustion chambers
Cometic "MLS" Head Gaskets
ARP Undercut Head and Main Studs
CP Pistons & Pins - 24cc Dish (Approx. 9.0:1 comp ratio with 62cc heads and .040 gasket)
Total Seal Piston Rings
Manley 5.700" H-Beam Connecting Rods
Callies Billet Steel Splayed 4 Bolt Main Bearing Caps
Callies "Stealth" 4340 3.75" Stroke Crankshaft - Internally Balanced
Fluidampr 7.5 o.d. internal balance 740101
Cloyes Double Roller Timing Chain
Canton Road Race Oil Pan, Melling High Volume (10%) Pump Mel-10552, and Canton Pickup
Trickflow 7.3" Chromemoly One Piece Pushrods TFS-21407300
__________________________________________________ __________
I am going to post build pics along the way.
Driver's Header tacked
Last edited by RealQuick; 11-07-2011 at 10:24 AM. Reason: Added dyno numbers
06-02-2010, 07:37 AM
#6
Registered User
Join Date: Sep 2002
Location: Crystal Lake, IL
Posts: 1,286
That head/intake setup has my interest.
Id really like to do away with the stock LT1 Intake and Holly 58mm TB. And do something similar to that
**EDIT**
too bad i cant see pictures at work. damn websense
Id really like to do away with the stock LT1 Intake and Holly 58mm TB. And do something similar to that
**EDIT**
too bad i cant see pictures at work. damn websense
Last edited by 93Z286Speed; 06-02-2010 at 07:39 AM.
06-30-2010, 12:53 AM
#10
Registered User
Join Date: Apr 2005
Location: Colorado Springs, CO
Posts: 1,830
I've got a head/intake setup just like this one for sale. Let me know if your interested. They are SBC Dart heads converted for LTX reverse flow cooling and use a SBC intake manifold, I've got a ported/customized edelbrock EFI single plane.
08-14-2010, 07:28 PM
#11
Registered User
Thread Starter
Join Date: Feb 2002
Location: Bridgewater, MA
Posts: 5,645
Bringing this back up as I started on the project again for the customer. I wasn't happy with the fit of the headers, so i remade them 
I freed up some clearance and made the install much easier.
pass:
driver's:
I freed up some clearance and made the install much easier.pass:
driver's:
