is it tru that a turbo 400 takes power from motor??? - Team Camaro Tech
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post #1 of 19 (permalink) Old Nov 15th, 00, 10:28 AM Thread Starter
 
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well was wondering if it takes more power to run a turbo 400 instead of a turbo 350 , cause we are puttin this turbo 400 in my car with 3000 stall before i had a stock turbo 350 with no stall , and some guy told me that by using a turbo 400 it would take like 25 HORSE POWER is this true cause if it is do u think it will improve my time any by going with this tranny right now it runs a 14.49 at 96.43 mph. thanks for the help guys later
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post #2 of 19 (permalink) Old Nov 15th, 00, 12:01 PM
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Yes, the Turbo 400 takes more power to turn. It is also heavier. Stay with the 350 for your car.
Stephen

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post #3 of 19 (permalink) Old Nov 15th, 00, 01:10 PM
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Put the new converter in the 350. The 350 has less rotating mass and will allow the car to accelerate quicker. This is assuming that the 350 is able to handle the power you are producing. You didn't say anything about your engine.

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post #4 of 19 (permalink) Old Nov 15th, 00, 02:00 PM Thread Starter
 
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my engine is a 400 small block with 490 lift cam and headers and high flow stock head also gots an eldelbrock rpm performer intake and a 750 cfm holley o yeh and bored over 30
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post #5 of 19 (permalink) Old Nov 15th, 00, 02:05 PM
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Cool

I may be in the minority here but I prefer the Turbo 400 for the torquier (word?) engines like yours and for big blocks. Stick it in and forget about it. My 2 cents.

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post #6 of 19 (permalink) Old Nov 15th, 00, 02:20 PM Thread Starter
 
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how much horse power am i going to lose 25 or what
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post #7 of 19 (permalink) Old Nov 15th, 00, 03:00 PM
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If I read your first post correctly you are going from a Turbo 350 to a Turbo 400?
The trans mount is in a different place, you will need a new drive shaft because the yoke is a different size. All of this to LOSE horsepower?
I ran a Turbo 350 behind a nitrous small block 383 running 10.20 at 135 mph and never hurt the trans. I know of many other people run Turbo 350s behind big blocks without problems.
IMO keep the 350.
Stephen

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post #8 of 19 (permalink) Old Nov 15th, 00, 04:27 PM
 
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Somewhere on the web there is a sight that lists the loss's due to the different auto trannies.

Seems like it was the powerglide the least, all the way up to the TH400 as the most with the big Ford C-6 right behind it.

If you got BRUTE power a Stock TH400 will out perform a TH350 up to the point of having sooo much power that a built unit is needed then money is the game because almost all of them can hold 800+hp if built right.

I looked into an Art Carr 200-4R for my big engine because it bolts in almost like a TH350.
I know I'm probably going to need something if I get carried away so thats why I'm doing my homework first, just so's I don't have DOLLAR shock when the time comes. pdq67



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post #9 of 19 (permalink) Old Nov 15th, 00, 06:59 PM
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No Camaro79,

The HP loss compared to a TURBO 350 should be an ABSOLUTE max of 2%. So on a 300 GROSS horsepower engine, the loss would be more like 6HP. Based on your quarter mile times, you are somewhere in this horsepower range.

[This message has been edited by sr71bb (edited 11-15-2000).]
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post #10 of 19 (permalink) Old Nov 15th, 00, 07:09 PM
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I suppose you could take into consideration that the TH350 has a slightly taller 1st gear (2.52 versus 2.48) - the advantages or disadvantages associated with that depend upon your overall setup, of course. I think the TH400 robs about 5-10 HP more that the TH350. Powerglides steal much less. Why do you think so many drag cars use the PGs? I know a guy that is in the 9's with a PG (not a Camaro by the way). I'd stick with the 350.

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post #11 of 19 (permalink) Old Nov 15th, 00, 07:19 PM Thread Starter
 
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alright thanks guys glad it isnt 25 horse power had me scared lol but ill try this tranny, do u think the turbo 400 will give me a better top end .
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post #12 of 19 (permalink) Old Nov 16th, 00, 01:58 PM
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No.
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post #13 of 19 (permalink) Old Nov 16th, 00, 04:54 PM
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Double no. All trannys that don't have overdrive run direct (1:1) in top gear. Like I said earlier, the 350 is actually geared slightly lower, but very little - you probably won't notice the difference. The TH400 was built to be stronger than the TH350; I can't think of any reason that it would make you go faster.

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post #14 of 19 (permalink) Old Nov 16th, 00, 06:25 PM
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I can think of two reasons that switching to a 400 with a 3000 stall would make you quickor.If it is fresh,it would provide less slipage, and that 3000 stall will let you launch closer to peak torque.

If you were to take and put that 3000 stall in a TH-350 of equal quality and build state,the TH-350 would make your car faster than the same 3000 stall in the 400.

Three reasons to run a TH-350 over a TH-400,less weight,it takes less power to drive it,better first gear ratio.


[This message has been edited by mutant 68 (edited 11-16-2000).]
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post #15 of 19 (permalink) Old Nov 17th, 00, 04:17 AM
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There's absolutely nothing to gain in your case by switching to a TH400. You'll not only gain 60-70lbs, but lose @10 horses as well. You'll also need the driveshaft shortened and the proper yoke/u-joint changed. The TH350 is stouter than it get's credit for sometimes. Mine has withstood hundreds of passes in the 11's and a few dozen in the 10's(NOS). Not to count thousands of miles on the street. Rebuild your TH350 with a shiftkit and your 3000 stall convertor. That's your best bet.

[This message has been edited by Hals73RS (edited 11-17-2000).]
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