SpeedTalk Store - Opinion Columns

Turbo 350

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Turbo 350

Postby hitchcock » Thu Sep 10, 2009 5:28 pm

Anyone out there know about how much power you can out through a th 350 with a T.C.I. performance rebuild kit. It has a jegs converter, manual valve body and about 500 hp.
73 vette 496, tunnel ram pro systems 950's and way too much cam!
hitchcock
Pro
Pro
 
Posts: 385
Joined: Sun May 08, 2005 5:00 pm
Location: Wichita Ks.

Postby bigjoe1 » Thu Sep 10, 2009 6:35 pm

I dont know about YOUR 350 trans, but I used to run turbo 350 !s with up to 750 HP, and they seemed to whold up pretty good, NOT with a trans brake though


JOE SHERMAN RACING
bigjoe1
Show Guest
Show Guest
 
Posts: 5224
Joined: Thu Aug 24, 2006 7:16 pm
Location: santa ana calif-92703

Postby hitchcock » Thu Sep 10, 2009 6:55 pm

So what does one need to live behind 500 hp in a 2900 pound car with no brake?
73 vette 496, tunnel ram pro systems 950's and way too much cam!
hitchcock
Pro
Pro
 
Posts: 385
Joined: Sun May 08, 2005 5:00 pm
Location: Wichita Ks.

Postby automotive breath » Thu Sep 10, 2009 7:11 pm

The weak link on a T350 is the sprag, replacements available from places
like BTE. A good valve body and extra frictions in the clutch packs will
make it live longer.
automotive breath
Guru
Guru
 
Posts: 1608
Joined: Sun Aug 28, 2005 10:54 pm

Postby redsmokin57 » Fri Sep 11, 2009 3:47 am

Was told many years ago to not do burnouts starting in first , with a manual valve body either top gear only, or second to top, helps turbo gearboxes live. And also what Automotive Breath and bigjoe1 said x2
Cheers Steve
Steve Menso
57 chev drag 76 pontiac street 34 chev babbit pounder
User avatar
redsmokin57
Pro
Pro
 
Posts: 290
Joined: Tue Jan 20, 2009 6:29 am
Location: NORTH QUEENSLAND AUSTRALIA

Postby cb1 » Sat Sep 12, 2009 12:41 pm

I am in the same situation. I have a street car, engine is dynoed at 580 but I might tune it down a bit for the street. I am un decided between turbo 350 or 400. I thought I would be stronger with the 400. CB
cb1
Member
Member
 
Posts: 91
Joined: Sat Dec 06, 2008 11:13 pm
Location: Mo.

Postby bigjoe1 » Sat Sep 12, 2009 1:36 pm

From my own experiance, a 350 is at least one full tenth quicker in the quarter mile than a 400. I woul;d pick the 350 everytime over the 400. It just wont last as long


JOE SHERMAN RACING
bigjoe1
Show Guest
Show Guest
 
Posts: 5224
Joined: Thu Aug 24, 2006 7:16 pm
Location: santa ana calif-92703

Postby Jason G » Sat Sep 12, 2009 2:16 pm

I ran a 6 cyl. TH350 (less clutches) with a quality rebuild and TransGo auto/manual shift kit. Put 200+ passes on it behind a 450-480 HP SBC before the 2nd gear sprag let go. 3600 lb car, which makes a difference as well.

Been running a TH350 with extra clutches, manual VB and BTE steel direct drum and 36-element sprag behind a 730 HP SBC. No other changes. Somewhere around 80 passes and a bunch of chassis dyno pulls on that combo.

Shooting for 850+ HP on the next engine and am upgrading to an aluminum fwd drum with 300M input shaft. Next freshen will likely get an aluminum direct drum as well.

There are two ways to go fast. Make more power or use a more efficient drivetrain or both.

My advice would be to use a VB that does not HAMMER the 1-2 shift. Nice and crisp and FAST, but not harsh. Combine that with hardened outer race should work well for a good while with the proper burnout procedure. The 36-element sprag/direct drum will for sure get it done.

Jason G.
Jason G
Pro
Pro
 
Posts: 227
Joined: Mon Feb 21, 2005 8:56 pm
Location: TX

Postby ERV JR » Sat Sep 12, 2009 10:02 pm

There are plenty ofcars inthe low 9's with th350 's @ around 3200lbs.There is another car that hasbeen 8's.
First tip is to do a high gear burn out, if you dont have the power then startin 2nd and click 3rd as soon asyou have wheel speed. he 36 element sprag is a choice you have to make as theyalso break. You can use a HD outter race and a factory type sprag.Leave the accmulator in for the 1-2 shift as this will help the trans out alot.also the wave plate for low gear. Use 5-5-3 clutch packs.
Another thing is a shitty cheap converter will come apart or cause alot of heat eiterof which will hurt the trans
ERV JR
New Member
New Member
 
Posts: 29
Joined: Fri Aug 14, 2009 4:20 pm


Return to Engine Tech

Who is online

Users browsing this forum: amc fan, Bing [Bot], BOOT, Hrdlx62, mike fabish, Mr 408, RCSmith, Top452, X-file, Yahoo [Bot] and 23 guests