Vanning.com logo
Boxdin
Site Navigation


Advertisements
Recent Posts
Good day
by lukester - March 28th 2024 12:26 pm
Crazy mods
by MufflerMan Mike - March 28th 2024 9:38 am
Lew Greger
by MufflerMan Mike - March 27th 2024 5:15 pm
1987 G20 Gypsy
by SDMickey - March 25th 2024 9:39 pm
Featured Links


Previous Thread
Next Thread
Print Thread
Rate Thread
Page 7 of 15 1 2 5 6 7 8 9 14 15
Re: 1997 Chevy Express Cobra Conversion
1983 G20 Van #783850 October 18th 2021 1:23 am
Joined: Apr 2007
Posts: 249
Likes: 59
1
G Van Man
OP Offline
G Van Man
1
Joined: Apr 2007
Posts: 249
Likes: 59
Startup of the 383 in the Express with the factory L31 based manifold and ignition, running on a Green/Blue P59 out of a 2004 DBC 6.0L van. So far I have segment swapped the 4L85E, turned the VATS off, set the injector flow rate to match the AUS Injection 48 lb/hr spider and copied the MAF table from a 2002 L31 van into the 2005 Mexican tune. Had to populate the idle tables that were not used with the manual trans. Other than that the mexican cal is relatively stock GM issue. Ran it on the old 0411 the other day.

https://youtu.be/FzEDpuSIwJc


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
AdSense long
Re: 1997 Chevy Express Cobra Conversion
1983 G20 Van #783863 October 18th 2021 6:03 am
Joined: Jul 2019
Posts: 11,241
Likes: 412
S
Post Junkie
Offline
Post Junkie
S
Joined: Jul 2019
Posts: 11,241
Likes: 412
Brother that sounds and looks clean. Thanks for the video. chevy

Re: 1997 Chevy Express Cobra Conversion
1983 G20 Van #783869 October 18th 2021 10:36 am
Joined: Nov 2013
Posts: 3,692
Likes: 32
pooh-bah
Offline
pooh-bah
Joined: Nov 2013
Posts: 3,692
Likes: 32
Nice work!

I've often though that a GM 383 replacement for my L31 would be nice. But the old L31 just keeps running so nice, I don't see it happening until it dies.

Re: 1997 Chevy Express Cobra Conversion
1983 G20 Van #784146 October 23rd 2021 1:42 am
Joined: Apr 2007
Posts: 249
Likes: 59
1
G Van Man
OP Offline
G Van Man
1
Joined: Apr 2007
Posts: 249
Likes: 59
Hooked up the exhaust, topped off the cooling system and let it run long enough to get up to full temp with the closed loop enabled. Pulling about 10-15% on the long terms. Still have the cutouts open and need to hook them up again. Tamed down alot in closed loop.  Also disabled the catalyst warmup spark retard.

https://youtu.be/FPEuk8hibPg


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
1 member likes this: frscke1
Re: 1997 Chevy Express Cobra Conversion
1983 G20 Van #784152 October 23rd 2021 10:02 am
Joined: Feb 2002
Posts: 32,696
Likes: 172
Old Timer
Offline
Old Timer
Joined: Feb 2002
Posts: 32,696
Likes: 172
Great work!


Jim & Lucy Newkirk
1965 Chevy Bad Influence
1981 Chevy-the Love Shack
2012 Chevy Van , 2020 chevy van
2020 Chevy van Sapphire Sweet.
Club Vannerz.
vanninvanner@comcast.net
Re: 1997 Chevy Express Cobra Conversion
1983 G20 Van #784211 October 24th 2021 9:47 pm
Joined: Apr 2007
Posts: 249
Likes: 59
1
G Van Man
OP Offline
G Van Man
1
Joined: Apr 2007
Posts: 249
Likes: 59
Hooked up a water hose to the heater return on the water pump and dumped the waste water out of the shop to really get all the heater core, and lines really flushed out today. Got it dialed in pretty good after adding a 4" MAF into the mixture. Also figured out the bog off-idle when first starting to open the throttle. Transmission abuse mode was kicking in even in Park and cutting the ignition timing to negative 15 or 15 after top dead center. Disabled abuse mode and it rips now. Its taken on some nice exhaust crackle and popping going into decel fuel cut as well. On throttle snap up to fuel kill at 5,200 it leaps up the RPM band. To hit the air/fuel ratio target the MAF is reading 410 gms/sec at 5,200 rpm. Given the formula of 1 gm/sec is 1.2 hp, that means I am feeding it 492 hp worth of fuel. Predicted torque on the torque model is reaching 512 ft/lbs at about 3,700 rpm. The cyl/air reading holds pretty flat at 1.03-1.09 gms/cyl from about 3,000-5,200. It is moving a ton of air through the engine and the exhaust just booms because of it.

https://youtu.be/iEn1Ht6Ta-s

https://youtu.be/1xXFPoS3Y2Y

Last edited by 1983G20Van; October 24th 2021 9:52 pm.

1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: 1997 Chevy Express Cobra Conversion
1983 G20 Van #784216 October 24th 2021 11:14 pm
Joined: Jul 2019
Posts: 11,241
Likes: 412
S
Post Junkie
Offline
Post Junkie
S
Joined: Jul 2019
Posts: 11,241
Likes: 412
So nice.

Re: 1997 Chevy Express Cobra Conversion
SDMickey #785120 November 13th 2021 10:00 pm
Joined: Apr 2007
Posts: 249
Likes: 59
1
G Van Man
OP Offline
G Van Man
1
Joined: Apr 2007
Posts: 249
Likes: 59
Originally Posted by SDMickey
So nice.
Thank You!


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Re: 1997 Chevy Express Cobra Conversion
1983 G20 Van #785121 November 13th 2021 10:00 pm
Joined: Apr 2007
Posts: 249
Likes: 59
1
G Van Man
OP Offline
G Van Man
1
Joined: Apr 2007
Posts: 249
Likes: 59
Been playing around with the tuning and finally decided it was safe to crank up the RPM.  Engine has seen 6,500 rpm with the carb.  Have the fuel kill set at 6,200 now in the tune.  Absolutely rips up the rpm range.

https://youtu.be/J4v4Z9rAKio


1983 G20 Conversion Van, 350 TPI, Reed Hydraulic Roller cam, Ported 906 Vortec, Edelbrock 3817 TPI-Vortec Base, Doug Thorley Tri-Ys, Dual 2 1/2" exhaust, Speed Density 7730 ECM tuned by ME, 700r4 by ME, Stock 1,600 rpm converter, Rebuilt Stock 10 bolt with posi by ME, 3.08 gears, 358 RWHP @ 5,200, 384 RWTQ @ 3,400, 14.66 @ 95.43 w 2.28s 60'
Page 7 of 15 1 2 5 6 7 8 9 14 15

Moderated by  Astro 

Link Copied to Clipboard
Donate


Upcoming Events
discovery
Who's Online Now
0 members (), 21 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Newest Members
TheDrunkenGunsmith, Jac, LOVclassics, ZenMuffin, Milkman530
12724 Registered Users
Top Posters (30 Days)
SDMickey 125
CatFish 25
frscke1 25
Wedgy 21
Forum Statistics
Forums68
Topics35,746
Posts537,916
Members12,725
Most Online177
May 8th, 2013

Powered by UBB.threads™ PHP Forum Software 7.7.4