Big power! Still twin??

[skybusr34]

im now single, but tbh i still prefer the twin set up.  apart from the screamer pipe.

[Rixio]

I\'l get the dyno graph and post it on dyno graphs/fastest stock twins thread.

How about large twins? Everyone goes for singles, what about uprated large twins?

[shaunwil]

I think the twins would still act like a single turbo, same as the non sequential setup. Plus the cost of two smaller turbos, 2 wastegates, more piping and more complexity is the reason why people go for a single.

Just out of interest could you have two different sized turbos to improve the spool time on mega setups

Shaun

[Rixio]

But at least you dont get caught with your pants down, you\'l have at least some punch in the low revs with twins...

[shaunwil]

im not completely sure that you would on non sequential twins, whats the lagg like with them compaired to sequential twins ?

Shaun

[John Yorke]

No real boost till 4+k on non-sequential, seq. you see full boost from 2 -2.5k a big difference, mind when they do come on line it is like a small single :mmmm
Going single is the way forward if you want biggish reliable power.

Shaunwil: I thought yours was ATH?

[gsb876]

No real boost till 4+k on non-sequential, seq. you see full boost from 2 -2.5k a big difference, mind when they do come on line it is like a small single :mmmm
Going single is the way forward if you want biggish reliable power.

Shaunwil: I thought yours was ATH?

Shaun made 321.6 @ Hubs = 376.2 @ Flywheel  :wave

[John Yorke]

Shaun made 321.6 @ Hubs = 376.2 @ Flywheel  :wave

Only noticed the sig. it says atw?

[gsb876]

Only noticed the sig. it says atw?

The figures @ Thor were Hub readings  :Laugh

[shaunwil]

Doh !!!! thought at the hubs and wheels was the same Is there actually a difference ?

I think im going to end up going for a GT35r to get the early spool, but i\'ll probably look for a spare engine to rebuild and streetport.

Shaun

[John Yorke]

As a rule of thumb, -50 fwhp to give hubs, -18% fwhp to give wheels. HTH.
GT35 is a nice quick spooling turbo.......with the right port :cheers

[shaunwil]

The thing is thor had it setup so that it purely measured the hp at the point it was bolted up, there wasn\'t a ratio applied to the result to keep arguements about fwhp down to a minimum so wouldn\'t the result still be the same at the hubs as at the wheels

So how would a GT35r spool on stock ports

Shaun

[John Yorke]

Hubs and wheels are different because atw has the additional loss of grip, you are turning the wheels /tyres thus frictional loss.
When I was on stock twins I did back to back tests on Abbeys Dynopack and CPL\'s Dynodynamics results were : 346.5 ath @ abbeys and 317.8 atw @ cpl both resulted at near as dam 396fwhp. By the way these tests were carried out on the same day.

Gt35 will spool very well on stock ports, but, I am sure Pip will tell you to get the best out of the 35 you need to match the ports and I am assuming you have all the other mods in place.

[shaunwil]

Blimey can they make it all any more complex :Hammer

I think im getting there for it, Powerfc, Greddy profec B, big FMIC, uprated clutch, uprated fueling, racing plugs, diff brace............

Sorry if this thread has gone a bit off topic !

So looking at your results there is a 9% loss between the hubs and the wheels :eek

Shaun

[John Yorke]

Yup :Giggle if you think about it, you have a common transmision loss, say 9% and the frictional loss, sounds like you have all the mods in place, dependant on your fueling, only thing I would add is a spark amplifier and a bigger rad [singles make alot more heat]