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Old 01-25-2012, 02:40 PM   #1
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Post 88mm Turbo LQ4 6.0L '87 GN -- BMF Racing build/swap

So I have removed the old 374cu SBC to make room for the turbo LQ4. The vehicle is a '87 GN that is still a stock looking car (full interior and power everything) but is 8.50 cert. I'm guessing the car will be 3800 with driver. I will be reusing the turbo 400 and 9" since they are already built. Going to us HP tuners on factory drive by cable PCM.

Specs on engine:

- Complete drop out -- 2001 LQ4 with 32,xxx miles.
- Long block is completely stock except:
-stock rings regapped to .030"
-80lb Siemens Deka Injectors EV1 (PN: FI114961)
-ARP2000 rod bolts (PN: arp-234-6301)
-ARP Pro head studs (PN: arp-234-4110)
-LS9 head gaskets (PN: 12622033)
-LS9 MAP Sensor (PN: 12592525)
-yellow LS6 valve springs (PN: 12499224)
-Adapter Flexplate - LS to TH350/400 (PN: 12621399)
-Flexplate bolts (PN: 12563533)
-Flexplate Spacer (PN: 12563532)
-Edelbrock fuel rail kit (PN 3638)


Turbo stuff:

-PTE PT4788 T6 0.96ar
-5" Aluminum Downpipe
-Large Water to Air Intercooler (front mount)
-3" coldside pipes
-JGS 60mm WG
-JGS 50mm BOV


Going to try to use factory truck manifolds and do some type of crossover to the Passenger side, kind of like the factory hotside setup would have been in the GN 3.8L engine. Hope to place the turbo in a similar to stock GN arrangement also. We will see how that works out when I get the engine in the car and check for clearances.

The built N/A 374 ran 11.2 @ 122mph. I hope this "stock" LQ4 with 15 or so PSI isn't slower. EDIT: it was faster at only 6psi it ran 11.10.

Guess we will see, many pics to come of the build.
__________________

1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi

Last edited by BMF_Racing; 05-16-2012 at 12:20 PM..
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Old 01-25-2012, 09:59 PM   #2
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Cool

Here's a few pics to start off the build.

the car with the 374 SBC
Click the image to open in full size.


374 out
Click the image to open in full size.


The LQ4 getting ready to go in
Click the image to open in full size.


PT4788 w/5" DP
Click the image to open in full size.
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1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi
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Old 01-26-2012, 02:03 AM   #3
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Good luck I'll stay posted and hopefully this will give me the boost I need to start my 5.3 turbo project. Keep the pics coming, nice GN
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Old 01-26-2012, 05:52 AM   #4
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I miss my GN, great looking car you have there and cant wait to see more.
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Old 01-26-2012, 08:00 AM   #5
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Quote:
Originally Posted by YungSteph View Post
Good luck I'll stay posted and hopefully this will give me the boost I need to start my 5.3 turbo project. Keep the pics coming, nice GN
Let me know if you go with HP Tuners, my buddy has it on his '87 Blazer 2dr 2wd turbo PTE74mm 5.3L. He has 60lb injectors with meth, ran 124mph @14psi with it really falling on its face on top end (ran out of gear & old valve springs). Might be able to save you some time on the setups.

Should have more pics soon of my project, dropping it in today. Its going to be a long weekend.
__________________

1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi
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Old 01-26-2012, 08:05 AM   #6
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love the white
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Old 01-26-2012, 08:28 AM   #7
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Quote:
Originally Posted by BOBS99SS View Post
love the white
Thanks, me too. I've always wanted a GN, but didn't want a black car. When this one came along I had to have it.
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1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi
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Old 01-26-2012, 10:24 AM   #8
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Pls. take some pics when you drop in the engine. I'm doing the same with a GT 4788 T4. with a 6.0 and 4L80E, am using the same headers as Mike Bamford headers .
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Old 01-26-2012, 12:01 PM   #9
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Originally Posted by lamdenali View Post
Pls. take some pics when you drop in the engine. I'm doing the same with a GT 4788 T4. with a 6.0 and 4L80E, am using the same headers as Mike Bamford headers .
Are you looking for mostly exhaust routing or just everything in general? It will be on the lift so it shouldn't be a problem to get whatever.
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1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi

Last edited by BMF_Racing; 01-26-2012 at 09:47 PM..
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Old 01-26-2012, 12:53 PM   #10
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I really want to see if you could fit the truck pan with your set up.
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Old 01-26-2012, 02:25 PM   #11
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That is one clean looking car! Can't wait to see more progress!
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Old 01-31-2012, 05:49 PM   #12
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Cool

Ok, got alot done so here comes the pics of the progress.


First had to make room for the ultra bell.
Click the image to open in full size.


Here's the adapter/mounts I used.
Click the image to open in full size.


Engine finally in.
Click the image to open in full size.


Shot of the oil pan. I can be pretty sure when I say the stock truck pan will not fit the factory g-body cross over. You can see in the second pic in this thread what my crossmember looks like now.
Click the image to open in full size.

Trying to figure out where the 88 is going to fit/work
Click the image to open in full size.


Turbo brace/mount in place
Click the image to open in full size.
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1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi
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Old 01-31-2012, 06:16 PM   #13
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The idea of trying to replicate the hotside pipes from a factory GN 3.8L turbo setup kinda worked out. I was able to use the factory truck drivers side manifold in the stock direction. Chopped the end off and welded on a slight bent to a v-band. The factory manifold welded very nice, much easier than normal cast iron.
Click the image to open in full size.


Installed and everything clears.
Click the image to open in full size.


Drivers side crossover 2.5" & vband
Click the image to open in full size.


Passenger crossover 2.5" and up
Click the image to open in full size.


To the Passenger side truck manifold flipped upside down and chopped and notched at the end for the merge, 88 in place.
Click the image to open in full size.


Merge/collector all done.
Click the image to open in full size.


Pass side all done with 60mm WG flange
Click the image to open in full size.


all installed and WG on
Click the image to open in full size.
__________________

1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi

Last edited by BMF_Racing; 01-31-2012 at 07:00 PM..
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Old 01-31-2012, 06:26 PM   #14
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Looks good.. Gotta love them gn's
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Old 01-31-2012, 06:59 PM   #15
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Click the image to open in full size.


Bottom shot of the turbo mounted.
Click the image to open in full size.


12AN drian.
Click the image to open in full size.


Custom front mount Water to Air intercooler done
Click the image to open in full size.


Cold side pipes done/installed
Click the image to open in full size.


Click the image to open in full size.


We did all the HP Tuners stuff loaded & get it fired up and idling very well. Surprising the 5" dump to the ground it not as loud as you'd think. I'm happy with everything we got done in the Friday night to Sunday work time. Just need to clean everything up now its a mess from trouble shooting a small issue.
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1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi
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Old 01-31-2012, 07:04 PM   #16
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nice build. what did you use for all you gaskets on the hotside? is it copper sylincoln
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Old 01-31-2012, 07:13 PM   #17
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Cool swap! Car looks clean too.
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Old 01-31-2012, 08:31 PM   #18
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Very nice.... I was imagining a turbo setup similar since everyone on the site seems to think I should use only 1 turbo instead of the 2 I bought.
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Old 01-31-2012, 09:21 PM   #19
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Quote:
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Very nice.... I was imagining a turbo setup similar since everyone on the site seems to think I should use only 1 turbo instead of the 2 I bought.
Yeah, figured the 1400hp that turbo is rated at is good enough & will far exceed any set up I have in the few years. Twins are cool, just no need for them for my setup. All about the go, not the show. Lol
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1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi
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Old 01-31-2012, 09:22 PM   #20
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Quote:
Originally Posted by tt383lt1 View Post
nice build. what did you use for all you gaskets on the hotside? is it copper sylincoln
Yeah but not sure how it will work out. Guess I'll find out.
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1987 BUICK GN - Methanol 403 LsX pt98/101mm Holley Dominator EFI 2013 Build
-Stock Long Block 6.0 lived to 740whp bent 3 rods2012 Build

Project BMF-mobile - '91 F150 forged 6.0L - S475
DD - 2002 Pontiac Trans Am WS6 - M6
RIP 82 OLDS CUTTY11.02 @ 129.17 - 200 shot
Sold - 1987 BUICK Turbo T W02 - 93 w/alky 421whp/494wtq 11.61 @ 116.81 67mm@19psi
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Old 01-31-2012, 09:22 PM
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60, 60l, 88mm, build, complete, engine, factory, longblock, lq4, lsx, manifolds, pt4788, stock, turbo, welding


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