BMF_Racing

iTrader: (6)

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 3950 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.

BMF_Racing

iTrader: (6)

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

the car with the 374 SBC



374 out



The LQ4 getting ready to go in



PT4788 w/5" DP

YungSteph

iTrader: (1)

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

nos487

iTrader: (4)

I miss my GN, great looking car you have there and cant wait to see more.

BMF_Racing

iTrader: (6)

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.

BOBS99SS

iTrader: (2)

love the white

BMF_Racing

iTrader: (6)

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.

lamdenali

iTrader: (5)

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 .

BMF_Racing

iTrader: (6)

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.

lamdenali

iTrader: (5)

I really want to see if you could fit the truck pan with your set up.

Stoney667

iTrader: (3)

That is one clean looking car! Can't wait to see more progress!

BMF_Racing

iTrader: (6)

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


First had to make room for the ultra bell.



Here's the adapter/mounts I used.



Engine finally in.



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.


Trying to figure out where the 88 is going to fit/work



Turbo brace/mount in place

BMF_Racing

iTrader: (6)

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.



Installed and everything clears.



Drivers side crossover 2.5" & vband



Passenger crossover 2.5" and up



To the Passenger side truck manifold flipped upside down and chopped and notched at the end for the merge, 88 in place.



Merge/collector all done.



Pass side all done with 60mm WG flange



all installed and WG on

RacerXLs1

iTrader: (14)

Looks good.. Gotta love them gn's

BMF_Racing

iTrader: (6)

Bottom shot of the turbo mounted.



12AN drian.



Custom front mount Water to Air intercooler done



Cold side pipes done/installed






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.

tt383lt1

iTrader: (3)

nice build. what did you use for all you gaskets on the hotside? is it copper sylincoln

Strokinit383

iTrader: (22)

Cool swap! Car looks clean too.

99VetteFRC

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.

BMF_Racing

iTrader: (6)

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

BMF_Racing

iTrader: (6)

Yeah but not sure how it will work out. Guess I'll find out.