Big twins on a stock auto?

Has this ever been done before on a autobox (stock or built??) just been trying to look for info ect but not much luck, anyone know info or know how it might perform?

Have not bothered looking on the supraforums yet and i have not searched youtube but thought i would ask here first

They'll come on line just like your single will, but just harder. A built autobox is a must for these. Johnny made 670hp at just 1.25 bar so your box will explode instantly.

They'll come on line just like your single will, but just harder. A built autobox is a must for these. Johnny made 670hp at just 1.25 bar so your box will explode instantly.

I would have thought a built box would be first requirement, just wondered if it has been done so i can see results ect.

Not in this country to my knowledge. It's a trip to Supraforums unfortunately.

Okey dokey! cheers John, ill have a browse tonight and see what i can find.

it has been done. i know 2 guys who have done it. on standard boxes as well! one of them was for sale on ebay a few mths ago in stoke white one....he has been asking for a 6 speed box for a while though! just not had any in...

My concern would be the sledgehammer of torque that big twins give. This could be dialled down in the setup and mapping, but then whats the point? A mid size dbb/billet single is a much better bet for the gearbox IMO.

The Twins don't come in as hard as a single, it's a lot more progressive.

The Twins don't come in as hard as a single, it's a lot more progressive.

Yup, thats spot on and the good thing about that is they are very good for traction, you dont get that huge hit like you do on a big single.

The Twins don't come in as hard as a single, it's a lot more progressive.

As you've obviously recently had a big twin car, your opinion is more factual than mine, but I seem to remember the torque curve on big twin cars having a far steeper curve earlier in the rev range, which is what kills gearboxes, not the power delivery.

As you've obviously recently had a big twin car, your opinion is more factual than mine, but I seem to remember the torque curve on big twin cars having a far steeper curve earlier in the rev range, which is what kills gearboxes, not the power delivery.

Depends on the size of the turbos and the cams/tune they run with - I'm only speaking from what I've seen on mine - and from speaking to Lee too.

And there laggy as hell, not a very nice road setup at all Rob. They look good though!

I'd have to disagree with you there Paul. Mine was great.

I'd have to disagree with you there Paul. Mine was great.

Your turbos were rather more special than most though

I'd have to disagree with you there Paul. Mine was great.

I'm talking about the HKS twins, never been a fan of them personally, we've fitted and mapped loads of them over the years, unless your running 800bhp through them they are a bit pointless. Depends on what you want from your car I guess.

You will need a built auto box and high stall to make the most of them or go manual.

[ATTACH=CONFIG]158607[/ATTACH] i have been running big twins since 2009 pushing 690bhp on a stock auto box, i am now on box number five so the auto box will put up with big twins but not for long it seem to be down to luck! because one only lasted 700 miles and another has lasted over 4000 miles of hard driving and track time!

Hey mate cheers for the reply, last time i saw you the box had blown up lol... very nice figures too and you drive it hard which is something i dont do regulary.

Thnks to the others input too.

I'd deffinately like to go for a built autobox at some point. Looks like SRD are doing a few boxes but maybe cheaper to go six speed. I like the idea of the Titan autoboxes but would be worried about the shipping costs and how much tax and everything else you would get reamed for importing one. I seem to remember Paul had a Titan box in at some point but may have sold it by now.

600bhp/500flb torque is roughly the stock boxes limit..even then its just a case of when.. A built box and uprated torque convertor wont just ensure reliablity but will also make the most of turbos...as built transmissions tend to be more responsive and shift quicker..hence why all the US TWINS and Big twins making fast times etc are more often than none on built and uprated auto boxes...2-3 coolers are a must for these those.

I'd deffinately like to go for a built autobox at some point. Looks like SRD are doing a few boxes but maybe cheaper to go six speed. I like the idea of the Titan autoboxes but would be worried about the shipping costs and how much tax and everything else you would get reamed for importing one. I seem to remember Paul had a Titan box in at some point but may have sold it by now.

yeah he sold it ages ago i think. Im interested in a SRD one now! would be very lairy and prob insane to drive, i just love the word 'reliable' and as we all know it comes at a price... i wont go for more power unless i have a box sorted as i dont see the point blowing my stock box up every 5 mins! even if they are a couple hundred each time

Rob once you drive a hi-stall big ingle you will wonder how the hell you managed to drive without a hi-stall - totally different experience. Just check what hi-stall you go for as some are obviously meant for drag racing and feel like your revving the arse off a slipping clutch all day!!!

The car will need to rev over 7k for them to run well. U will need a big lower end so its not doable on a stock engine. I looked into this and went single in the end .

Depends on the size of the Twins. Mine had a 7300rpm rev limit. Made good power from 3800rpm.

The car will need to rev over 7k for them to run well. U will need a big lower end so its not doable on a stock engine. I looked into this and went single in the end .

i dont have a stock engine!