Roughly how much power will a C6 rob?

I am having a C6 built up which will basically replicate the one of Frank Merkyl's.

Anyone know how much power it will chew?

depends if you're rollerizing it or not.

depends if you're rollerizing it or not.

Yes. Full roller/manual. ( Merkyl TB valve body ).

This is an uneducated answer,but here goes. I would bet that as the HP in the engine goes up, the less HP the C6 will be noticed. My machinist has a 650hp Cleveland in his Mustang. He went to a 2 day event and on a Sat. he broke his C4, went home and got his C6 and Car ran identicle times on Sun. w/same weather conditions. So you tell me:confused:

but why spend $ 4000 on a C-6


I'm not sure who is charging you $4,000 on a C6 but your getting ripped off!

Well mine handles about 800hp in a 3600 lb truck and I have about $2,200-$2,500 in it (including Converter and powder coating the case)

The 4 grand was a quote Frank gave him in another thread.


If your t400 is so great Gerry why inquire about the c6?............other than to stir the pot? And it seems you had it fixed once already or freshened up???????? don't make no sense man.

Ever get them rules sorted out on that class yet?

Your point is to stir the pot............


I bet Frank could break it off in "her" ***...........




and it was 3k, for a "anything I can throw at it"..............

but why spend $ 4000 on a C-6 when you can spend $ under $ 1500 on a TH-400 and you will never break it :) and mine is stock :) with 900 + hp and its perfect working and has never broke

pretty sure the question was about how much hp the C6 robs. not how much it costs vs the POS TH400.

I stir it better than this though lol.

You can buy 3 billet input shafts for a 1000 bucks btw, or at least I can for a c6. They might be more for a turdbo 400.


I wouldn't run a C6 either, and thats my opinion.........

Have you considered an E4OD?

I am having a C6 built up which will basically replicate the one of Frank Merkyl's.

Anyone know how much power it will chew?

~30hp

My Quote was $3000 with the billet forward drum + the billet input shaft ($170) don't know were you got $4000
Frank
Ps Nice thing about a THM 400 is when you neutral it after a run it rolls the intermediate sprag an you have no 2nd on your next pass! keep the trany guy's busy!!

Jerry, I bet you have never owned a C6 in your life have you?............Thats what I thought. I have a Glide in Tweety now BUT,I tell you right now,If I have to rebuild it every year.... it's coming out and a C6 is going in. Because a stock c6 will withstand about as much as any other built tranny. I'm into reliability and not so much about a few HP that I might be losing at our HP levels. And as far as your Turbo 400 goes,I would'nt have it stuck up my *** if I had room for a Boxcar. Thats all I have to say about that.

but why spend $ 4000 on a C-6 when you can spend $ under $ 1500 on a TH-400 and you will never break it :) and mine is stock :) with 900 + hp and its perfect working and has never broke

My reason for persisting with the C6 is simple - I absolutely REFUSE to put anything GM in or on my car. If I had to spend 5 times as much making the C6 work, I would. Fortunately though, that isn't the case.

~30hp

Only 30hp?

the stock planetary's are strong enough , my C6 in my car has lasted 2 seasons without changing a clutch pack in the trans, in a car that weights 2850 lbs and runs 7.60's @ 186 mph with basically all stock internals, enough said in proof is in the results!!
Frank

RICK i hope you dont like anything up your *** :) and as far as keeping it all ford you will change your attitude once you start making big power :)

frank do they make good gear sets for a c-6 ? if you could prove to me a C-6 will not brake at the 1300-1500 hp levels ill buy one - im switching to a turbo soon,so im all for keeping it FORD if you can guarentee me it wont brake or atleast i dont have to service it 2 times a year $ 3170 for a bullet proff C-6 ? ill buy one

oh ya and my car weighs # 3300


Who are you kidding, fool? Your ride never runs long enough to tear anything up, and if it does you simply change your combo for no reason and get back into your Bench Racing Comfort Zone.

Won't take a strong trans to race that bench, so you might as well butt out.

Hey if ya wanna really stir it up Gerry just start talkin' about how crappy that Windy Hollow track is again...................

A midget rapist...................


.................is this a midget that rapes or a person that rapes midgets?

Note to self: "Buy more popcorn."

A midget rapist...................


.................is this a midget that rapes or a person that rapes midgets?

i believe the correct term is "little person" :D

so how much power roughly can a stock c6 handle?

what do you classify as stock ? something out of a 25 year old car with no oil changes ? or a stock rebuild with a pressure increase on the line pressure ,stock 55psi line pressure is enough for 400 ft/lbs torque 180psi -1100ft/lbs torque with all stock internals
Frank

and horsepower loss? I consider through a C6 the Hp loss as" 0 "loss , we have 7 round wins this year alone because the "2speed RACING Transmission" in the other lane failed!!!! But that's racing!!!! and if anybody's interested I know a buddy of mine that has 2 -Rosseler THM 400's for sale -$4500 ea ,they only need to be rebuilt every 2nd pass!!( fresh 32 element sprags with a fresh rebuild)
Frank

I've got two seasons on my truck with 900hp and a C-6, the truck weighs 5100 lbs and is a terror! 39'5 cut boggers in a 200 ft mud pit. The C-6 is the way to go. If you have the funds, I strongly recommend one of Franks' brakes, it's awesome! Power loss, in my opinion, is not even a question.

I read a really good write up on all this not to long ago. The guy tested many different transmissions including sticks. He claimed for a trans. it was a factor of x amount of horsepower + a percentage. Not that hp overcomes the mass of the trans.

Something like the trans would require 15hp +14%, rather than say 24% like everybody calculates. Now I pulled those numbers out of nowhere, but I think that his theory was sound. Seems like he tested the th400 and maybe the C6, you might want to search on google.

My reason for persisting with the C6 is simple - I absolutely REFUSE to put anything GM in or on my car. If I had to spend 5 times as much making the C6 work, I would. Fortunately though, that isn't the case.

Thats why you put a jw or ried in it, then u can say its a two speed racing trans.No more gm than a eliminator block is ford.

Thats why you put a jw or ried in it, then u can say its a two speed racing trans.No more gm than a eliminator block is ford.

I'm using an A460 :D

As well as that, my car is a street car and will weigh in around 3800lb minus driver. Would prefer 3 speeds, and I'm confident that replicating Frank's build will work well for me.

KY krew built a 940 hp BBF for a friend of mine's pulling truck, and his C6 is on 3rd season.

maybe i missed something.....but, what was the original question here ???

what do you classify as stock ? something out of a 25 year old car with no oil changes ? or a stock rebuild with a pressure increase on the line pressure ,stock 55psi line pressure is enough for 400 ft/lbs torque 180psi -1100ft/lbs torque with all stock internals
Frank

My C6 is stock and I apparently get 420 lb ft out of my stock 429. I'm not trying to be a smarty pants, obviously im missing something. This thread is relevant to me as well since I have no idea how much power my c6 will take or what I need to do to make sure it will take the power I want to put through it (which isnt all that much compared to some of the setups ive seen on here lol).

25% is the one ive heard a lot of too.

25% is for total drivetrane loss... from flywheel to rear wheel... even the best designed drivetrane will lose 15-18% and thats with a stick. 4wd mud trucks with big tires can be up in the 40%+ range... as far as the trans itself goes id say probably around 7%... the difference between a stick (negligable loss) and an automatic... in the case of a 1000 hp engine you might lose 70 hp... but even a powerglide will probably lose 50 hp at that level and have to be freshened up every third trip to the track

There must be a formula to calculate horse power loss to your trans.Other wise if we said 20% then why would you loose 150 hp from a 600 hp. 460 and only loose 55 hp with stock 220 hp. 1976 460 with the same trans?

Came across this on another site:

Power loss for various auto transmissions:
Please remember these are approximate values, and were provided by Car Craft Magazine.
Powerglide_____18 hp
TH-350________36 hp
TH-400________44 hp
Ford_C-6______55-60 hp
Ford_C-4______28 hp
Ford_FMX______25 hp
Chrysler_A904__25 hp
Chrysler_727___45 hp

how i look at is; accel of mass , yes the c6 high/rev. drum is heavy, forward is also . you only have to aceel the stopped mass once, then accel. that mass 1K rpm on gear changes. not that much difference on GM400/TF727/C6, 904 & C4 very light on mass weight. screw 2 speeds

I'll keep my 2 speed, the performance numbers don't lie, that and those winner checks I cashed since its install don't either.............:)

the stock planetary's are strong enough , my C6 in my car has lasted 2 seasons without changing a clutch pack in the trans, in a car that weights 2850 lbs and runs 7.60's @ 186 mph with basically all stock internals, enough said in proof is in the results!!
Frank

Frank definetly has the ultimate test bed for the C-6. 186 MPH @ 2850 pounds is around 1430 HP by my calculator. All I can Say is WOW!!!!!!!!! You cant win if you break

I'll keep my 2 speed, the performance numbers don't lie, that and those winner checks I cashed since its install don't either.............:)

OK if your a class racer, bracket -- ET dail in on the window don't care what trans or engine , goes for brand also , same for index racing.

OK if your a class racer, bracket -- ET dail in on the window don't care what trans or engine , goes for brand also , same for index racing.

From what I've seen, switching from a good setup with a 3-speed to a good setup with a 'glide (that means correct gearing, launch technique, etc.) will gain you about a tenth....and will be more consistant. And I don't care WHAT class you might be racing, "consistant" is a plus. It also appears to me that the lighter the car, the greater the gains.

Frank definetly has the ultimate test bed for the C-6. 186 MPH @ 2850 pounds is around 1430 HP by my calculator. All I can Say is WOW!!!!!!!!! You cant win if you break

Could'nt have said it better:)

As already stated, i would guess close to 30HP difference depending on application. C-6 will use up about 20 HP over a C-4.
C-6 is a great tranny but not real efficient and not the fastest Trans brake release for drag racing. If i understand right, the T-400 is a less HP robbing unit and doesnt have to stop the intermediate drum before shifting ,where as a turbo simply applies the next clutch pack to shift.
I have ran C-6s well in to the 8 sec range at 155mph and never hurt one but if i was real serious about winning id have to give it some serious thought and we havent even got into transmission gear ratios yet, which can mean everything. In the world of high HP, light ,Pro-tree cars an aftermarket chev based design trans might be worth looking at.
But for everyday street /strip applications the c-6 will stand up with the best of them.............................................S tan
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