Team Chevelle banner
  • Hey everyone! Enter your ride HERE to be a part JUNE's Ride of the Month Challenge!

1 - 20 of 196 Posts

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #1 ·
So I thought I’d start a thread on my winter build. Every year I do something to upgrade the car.

Little history, the car is a 1968 Beaumont Custom, I have owned this car since 2002. It laid rest in a field for 4 years when someone completed a semi restoration on it. The winters we’re pretty harsh in the area so now it definitely has some patina. This car to date has been threw 4 motors 5 transmission and 2 differentials. It started out as a Smokey 350 motor with a 700r4 and Corp 10 belt setup. Now it is a 502, T56 Mag, s60 combo. There is also an array of suspension and chassis upgrades to get it where is is today. Overall the interior and exterior remain stock.

So this leads up to this winters upgrades!

After completing Drag Week 2018 I have realized that if a guy wants more power you don’t necessarily need a larger motor, just cheat with some boost. Originally when I got the 502 I was gonna boost it but held back as my power goals were low for boost. For the builds end outcome I am looking to achieve a dyno proven 800-850 crank horsepower/torque between 5-5500rpm. I am not sure if this is realistic but we will find out. I am limiting myself to this number as the bottom end will not support anymore than this.

The combo will be a single (twin scroll) Garrett turbo
Single wastegate
5” down pipe with a single 3.50” exhaust and boost activated cutout
Water to air intercooler
GM 502 short block
AFR305 heads
Straub hydro cam
Victor intake
Holley super sniper
New LSA twin disk clutch

All said and done hopefully I can complete this before Rocky Mountain Race Week
 

Attachments

·
Premium Member
Joined
·
7,142 Posts
How big is the turbo?

Either way, love the car. Being from Ohio, we had a few Beaumonts running around. I have seen exactly one in my 34 years in Flariduh!

Sorry bud, I see way more that 850ish horse in that combo if the tune is right. I would have to feed it corn fluid and shoot for 25 pounds of boost.
 

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #4 ·
How big is the turbo?

Either way, love the car. Being from Ohio, we had a few Beaumonts running around. I have seen exactly one in my 34 years in Flariduh!

Sorry bud, I see way more that 850ish horse in that combo if the tune is right. I would have to feed it corn fluid and shoot for 25 pounds of boost.


Turbo is a Garret GT4202,75mm, which is a fairly decently sized turbo but for this build it is consider small by most. I will most likely be out of the efficiency zone but should provide very quick response for a 90% stick shift street car. Like any upgrade the initial cost is a killer and I got this thing less than you would buy a *********** turbo at, plus side is that it is brand new never used, ready for abuse. So the plan is to build things keeping in mind it will be upgraded in the future.
 

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #6 ·
That car is badASS, Chris! <img src="http://www.chevelles.com/forums/images/smilies/thumbsup.gif" border="0" alt="" title="Thumbsup" class="inlineimg" />

Are those wheels the Nascar/racing slotted steel wheels? I like those.
Yes Bassett wheels, one of the few non-dot approved parts.
 

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #7 ·
Well I got the passenger side manifold/header completed. Just have to finish weld it out. To my surprise this manifold actually creates a scavenging effect, well at least with compressed air running down it. If pushing on tube 7 it will draw on 3&5. And conversely for the other. Tube 1 is solo and creates very little scavenging nor does it see much at all. Spark plug/boot clearance is 10-fold over the headman headers! As well the steering shaft. I see it does come close to the rag joint, might have to opt for a universal there instead.

Material I choose was steel, flanges are 3/8” thick with 16gauge tubing. Hopefully it will last.

Now to figure out how to weld this without warping everything.
 

Attachments

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #8 ·
Been a little slow on this build but here is a picture of the 2.5” exhaust crossover from driver side to passenger side. Utilized a 4” long expansion joint, these allow for approx 5/8” deflection. Cross over sits approx 1-1.5” below the oil pan but just slight above the crossmember.
 

Attachments

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #9 ·
Turbo mount built! Just need to finish up welder big and clean it up. Will have to redo the oil cooler lines on the rad. Clearance is about 1.5” from hood to compressor housing, hopefully that’s enough not to melt anything. Should be able to do a full 5” downpipe. Fender well clearance is a nice size if I decide to go to a bigger A/R housbig or bigger turbo in the future. As well I am thinking the alternator will fit back where I had it mounted before.

Now I can finish up the cross over, build passenger side manifold/header, and then the 60mm wastegate.
 

Attachments

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #10 ·
Well got a solid 2 days in on more fabrication work. Built the passenger side header/manifold. Turned out well. Spark plug clearance again way better than long tube headers.

Completed the exhaust cross over and tied everything into the turbo mount/flange. Turbo mount is strong enough to support the turbo without the help of the exhaust, so hopefully this will minimize and cracking that could occur.

So far it is looking like a 5” downpipe is completely possible.

Up next will be the wastegate piping and plumbing. I will be doing a 2 into 1 wastegate setup.
 

Attachments

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #11 ·
Quick shot of the wastegate merge pipes. This is a 2 into 1 adaptor. I am going to run a single 60mm wastegate. Reading a little it should be easier to work with as I don’t have to worry as much for syncing 2 gates or non-equal pressure in the banks, and less pipe work to get it back into the downpipe.

The waste gate of choice is a Turbosmart Gen V 60mm watercooled wastegate.

Each pipe is 1.75” diameter merging into a single 2.50” pipe to the gate.

Hopefully this does not effect spool times as the turbo is a twin scroll, my initial thoughts are ‘no’.

With a wastegate this size I should be able to dial boost down as low as 3-5lbs and as high as I want to take it. The turbo matchbot calculator says I would need approx. 50-55mm.
 

Attachments

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #12 ·
Well I got a 5” downpipe/exhaust fabricated, not sure how well it will work. It is pretty close to the valve cover, about 1/4” away. I don’t know if it will bake the oil on the inside or not, but will give it a try unless someone says something concerning.

I am thinking the valve cover will need to be ceramic coated with all the exhaust. Mayby wrap it as well.

Could always throw in some dents and give it clearance 🙂
 

Attachments

·
Premium Member
Joined
·
17,087 Posts
WOW Chris, just WOW! I missed a chance to buy a 68 from a fella with teh handle "snake" here back in maybe 2004-05 for 6K ( US and CDN were near par) .

Boy, if it turned out half as nice as yours..... one of my few regrets.....68 Beaumont, and a Russian-speaking redhead in the Army.....! :) Woulda , coulda, shoulda, ....

YOU DOING IT!
 

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #15 ·
Well looks like I got a deadline now. Registered for Rocky Mountain Raceweek! I will be racing in stick shift class.

Once all done I will be driving the Beaumont to the event and back, no trailer either. Should be around 4-4500miles in total.
 

Attachments

·
Registered
Joined
·
2,441 Posts
I like it :)

This will be a fun Chevelle.
When you have the time post more pics of the car....the patina and the interior.

Dan
 

·
Super Moderator
Joined
·
9,588 Posts
Good choice of beer's.
 
  • Like
Reactions: Chris27

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #18 ·
Well finished up the hot side of the wastegate. A 60mm wastegate is massive, but it fits. Hopefully I can get the vacuum pump beside the wastegate and water pump.

As well on the crossover I changed the expansion join from a 4” to a 6”. I was always told run the biggest one year u can fit and since I have the room. I will run the smaller 4” expansion joint for the wastegate to downpipe cold side.

Little slow on progress with all the welding required but it’s coming together.

Going to move on the check valve spring pressures, oil pan modifications, and manifold change.
 

Attachments

·
Registered
Joined
·
1,234 Posts
Looking good. You should bring that beast to Mission for some sea level drag action. The "Old Time Drags" is always a good time. Everything is 1972 and older. And as others have mentioned, excellent choice in beers. Still one of my favorites. :beers:
 

·
Registered
Joined
·
1,194 Posts
Discussion Starter · #20 ·
Well a Drag Week friend and local-ish guy in the area helped me out huge today with my clutch. Mayby some seen a post of a Mcleod street extreme that got hurt last year, as a result I was in need of a upgrade. So in some quick talks I got a used Mcleod twin disk RXT 1200. I will get further into details about flywheel weights and what not a little later as well what I have learned. Pretty stoked about it, I was original going to use a LSA/LT1 dual disk I have kicking around but this route will save a ton of time. I may still go that route down the road but let’s see how this works first.
 

Attachments

1 - 20 of 196 Posts
Top