Finally started the twin turbo project!

Reply Subscribe

Thread Tools

Search this Thread

Jul 23, 2010 | 11:50 AM

#241

71 chevy

TECH Fanatic

iTrader: (18)

Joined: May 2008

Posts: 1,608

Likes: 1

From: Dallas, Tejas

hey boosted, do you have data on how much each of those turbos flow?

Jul 23, 2010 | 08:40 PM

#242

Boosted One

Thread Starter

9 Second Club

iTrader: (6)

Joined: Aug 2002

Posts: 886

Likes: 0

From: Cecil County, MD

Sorry, I don't have any numbers for them. I looked for compressor maps also and couldn't find them online. I can tell you they worked well on my 346 and they work even better on the 402!

Jul 23, 2010 | 11:21 PM

#243

71 chevy

TECH Fanatic

iTrader: (18)

Joined: May 2008

Posts: 1,608

Likes: 1

From: Dallas, Tejas

Quote:

Originally Posted by Boosted One

Sorry, I don't have any numbers for them. I looked for compressor maps also and couldn't find them online. I can tell you they worked well on my 346 and they work even better on the 402!

yeah? pretty cool. how many rpms sooner are you seeing boost and max boost with the 402

Jul 23, 2010 | 11:26 PM

#244

Boosted One

Thread Starter

9 Second Club

iTrader: (6)

Joined: Aug 2002

Posts: 886

Likes: 0

From: Cecil County, MD

hmm, it's hard to tell. My converter was on the tight side with the 346 and with the added torque of the 402 it has loosened up some. By the time the converter flashes it's in boost. I'm very pleased with the combo! When my gopro camera comes in I'll post some video of it.

Frank

Jul 24, 2010 | 01:09 AM

#245

Marktainium

11 Second Club

Joined: Mar 2008

Posts: 445

Likes: 1

From: New Westminster, B.C., Canada

Your build has inspired me. Building all forged 402, low compression, Precision hp 6265's w/.82 ar. Using 'vette manifolds. Can you tell me more about clearancing for the 4" stroke.

Jul 31, 2010 | 02:13 PM

#246

Boosted One

Thread Starter

9 Second Club

iTrader: (6)

Joined: Aug 2002

Posts: 886

Likes: 0

From: Cecil County, MD

Great looking build! As far as crank clearance, I had to put space down the windage tray and cut that hole in my F body oil pan then weld a plate on the outside. Other than that you just have to verify your pickup isn't too close to the bottom of the pan after you space it down.

Frank

Jul 31, 2010 | 02:38 PM

#247

Boosted One

Thread Starter

9 Second Club

iTrader: (6)

Joined: Aug 2002

Posts: 886

Likes: 0

From: Cecil County, MD

Got to run the car at the track today and had a fairly good outing. I'm having some major traction issues. My best 60ft was 1.57! I had to pedal it through most of 1st gear and short shift into second to get it to do anything. But it's not all bad, I still ended up with my best time to date. It went 9.32 @ 152mph! Needless to say I'm pretty excited about that. Boost was set at 15psi so once I get some more seat time and get the traction issue straight, I'll start turning it up.

Jul 31, 2010 | 04:17 PM

#248

71 chevy

TECH Fanatic

iTrader: (18)

Joined: May 2008

Posts: 1,608

Likes: 1

From: Dallas, Tejas

Quote:

Originally Posted by Boosted One

good numbers. really good.

is it a manual vb th400? if it is, you could launch in 2nd gear. that would help with the traction

Last edited by 71 chevy; Jul 31, 2010 at 11:40 PM.

LS1 Tech Stories

The Best V8 Stories One Small Block at Time

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Pouria Savadkouei

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Verdad Gallardo

7 Most Reliable High-Performance Engines GM Has Ever Built

Verdad Gallardo

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Jul 31, 2010 | 09:45 PM

#249

Boosted One

Thread Starter

9 Second Club

iTrader: (6)

Joined: Aug 2002

Posts: 886

Likes: 0

From: Cecil County, MD

Quote:

Originally Posted by 71 chevy

good numbers. really good.

is it a manual vb th400? if it is, you could launch in 2nd gear. that would help with the traction

hmm. that's a good idea! I'm going to try that next time.

Jul 31, 2010 | 11:42 PM

#250

71 chevy

TECH Fanatic

iTrader: (18)

Joined: May 2008

Posts: 1,608

Likes: 1

From: Dallas, Tejas

Quote:

Originally Posted by Boosted One

hmm. that's a good idea! I'm going to try that next time.

no problem. my th400 has an unfriendly 2.75 1st gear, so I ran the combo thru eta for windows and it actually showed the combo going faster launching from second gear.

Aug 1, 2010 | 07:43 AM

#251

Fireball

TECH Senior Member

iTrader: (21)

Joined: Nov 2001

Posts: 8,484

Likes: 0

From: Cecil County Raceway!!!

should've gotten the glide

Aug 1, 2010 | 07:46 AM

#252

Boosted One

Thread Starter

9 Second Club

iTrader: (6)

Joined: Aug 2002

Posts: 886

Likes: 0

From: Cecil County, MD

Quote:

Originally Posted by Fireball

should've gotten the glide

lol, you told me that when I was building it! I'm a little hard headed huh.

Aug 1, 2010 | 09:35 AM

#253

Fireball

TECH Senior Member

iTrader: (21)

Joined: Nov 2001

Posts: 8,484

Likes: 0

From: Cecil County Raceway!!!

Quote:

Originally Posted by Boosted One

lol, you told me that when I was building it! I'm a little hard headed huh.

turbos and glides go together like peanut butter and jelly

Aug 2, 2010 | 05:59 AM

#254

Fireball

TECH Senior Member

iTrader: (21)

Joined: Nov 2001

Posts: 8,484

Likes: 0

From: Cecil County Raceway!!!

we weighed the "heavy chevy" yesterday

damn frank...you need to put that thing on a diet

Aug 2, 2010 | 06:23 AM

#255

02sleeperz28

9 Second Club

iTrader: (26)

Joined: Aug 2006

Posts: 1,833

Likes: 0

From: homeless

Very nice build.

Aug 2, 2010 | 06:47 AM

#256

Boosted One

Thread Starter

9 Second Club

iTrader: (6)

Joined: Aug 2002

Posts: 886

Likes: 0

From: Cecil County, MD

Car weighed in at 3533lbs. I was expecting 3200#. lol

Here's a vid of the pass.

http://www.youtube.com/watch?v=_7cNy...eature=channel

Aug 2, 2010 | 08:49 AM

#257

TracyRR

TECH Enthusiast

iTrader: (8)

Joined: Sep 2009

Posts: 699

Likes: 3

From: Louisiana

Wow, you made that look easy!!

Aug 2, 2010 | 02:36 PM

#258

Drewhelm

Staging Lane

iTrader: (7)

Joined: Feb 2008

Posts: 67

Likes: 0

From: Katy, Tx

Hory Clap!!! That thing MOVES!!! Can't wait to get mine done....truly inspirational.

Aug 3, 2010 | 07:04 AM

#259

CarsandWomen

TECH Fanatic

iTrader: (19)

Joined: Sep 2007

Posts: 1,497

Likes: 0

From: houston TX

maybe its just me but i think theres an 8 sec pass coming up, 9.32 at 15 psi with traction problems says its coming too.

Aug 3, 2010 | 08:37 AM

#260

Boosted One

Thread Starter

9 Second Club

iTrader: (6)

Joined: Aug 2002

Posts: 886

Likes: 0

From: Cecil County, MD

Quote:

Originally Posted by CarsandWomen

maybe its just me but i think theres an 8 sec pass coming up, 9.32 at 15 psi with traction problems says its coming too.

I would be soooo happy to see an 8 sec pass out of it. Not saying I'm not excited about what it did run. I'm certainly suprised! The best part is I was on the rev limiter at 7200 right around the 1000ft marker. So it looks like a gear change is in my future. They might help with the launch too. I would imagine if I took the full exhaust off and put the side dumps back on it may pick up some too.

Thanks for the kind words everyone!
Frank

Reply Share

First
Prev
13 / 15
Next
Last