Uran

I am about to make the conversion to single turbo but I not really sure which turbo to get. Ive narrowed it down to either the 35/40 or the 40R. THe guy at A-spec where ill get my kit from says the 40R is like a T78 BB is terms of spool and due to more efficent wheels capable of more power. I havent seen a dyno graph of the GT40R tho so i dont know just how quick it spools.
The GT35/40 however spools very quick but lacks in top end power.

Anyone know what sort of quater you would be doing with a 35/40 @ 415rwhp and a 40R @ 450-470rwhp.

Cheers

allrotor93

iTrader: (126)

mid 11s with the 40r and low 12s with the 35/40. just a guess. depends on the driver.

dancincake

Low 12's with the 35/40? low 12's are relatively easy with the stock snails.

Brad

hahahahah, right buddy. 'Relatively easy' is relative to how fat your wallet is.

Fat wallet = relatively easy
Skinny wallet != relatively easy

It ain't cheap to go fast...

Uran

I though 470rwhp would be more like low 11, maybe high 10 on slicks???

allrotor93

iTrader: (126)

he said with 420whp so i said low 12s maybe high 11s. the twins spool faster and will get you a lower et with the same power.

rallimike

iTrader: (1)

If you care about driving the car on the street, the GT 35/40 is great. I have the smaller version (.82) a/r, and a slight push on the accelerator gets me 10-12 psi. The car drives like a powerful V8. Say, a 1/3 down throttle can break the rear loose in 2nd. Full throttle and the rear gets squirrley in 3rd. So, are you driving it or racing it?

sst760

400hp on a fd is easy 11s. 470 will get you in the 10s. i ran 11.7 with t04e and only making 385hp. you will have no problem running 11s with 400, i don't care what kind of driver!

Broken09

iTrader: (1)

Uran,
It all really depends on what you will use the car for most. I mean will it be street driven? Are you wanting to drag race it? Auto-X it? Road Race? What are your hp goals? If you can provide us with this information we can in turn provide you with more/better help.
-Nic

Uran

Ok the car wil be used mostly for street racing. This said i dont not often do any standing starts but rather rolling starts from 1st or 2nd gear.
Also i will do some highway racing to abot 120 MPH.

Cheers!!

AJatx

iTrader: (1)

Highway racing? GT40R should have more top end than the GT35/40.

Why not just use the T51R or T78 for highway race?
It's not like you'll need the fast spool if you're on the roll.

J

Uran

I can get the GT40R kit for the same price as the T78. Apparently the spool on the GT40R is in between the 35/40 and the T78....thats y im leaning towards it.

Uran

NOTE: I will be doing 60% racing from rolling start 1st or 2nd gear and 40% highway racing ie. rolling from 50mph.

Broken09

iTrader: (1)

well it also depends on your other mods you plan to do and such. Personally I realize that my GT35/40 doesn't have the best top end but I have full boost by 3400-3500 rpm and it just stays on. If it were between the T78 and the 40r I'd get the 40r. I'm sure the top end power is near the same but with the BB on the 40 it'll spool up faster.
Ideally what hp are you shooting for?
-Nic

rceron

For my edification when you guys say "it lacks top end" does that mean that 415 rwhp or so isn't quite good enough?

Just curious... as a road racer (using the term loosely) that benchmark is more than sufficient.

R

Uran

Apparently the Gt40R makes more power tha the T78 due to the fact that it is the same size turbo and has a more efficent fin design.
I am aiming for mid 10sec passes, so around 500rwhp @19-20psi.
This said I am also looking for a turbo that will hit 20psi by low 4K rpms. I know the 35/40 hits it by 3.5K so im guessing that the 40R will hit similar boost by low 4K.
I think that 35/40 is a great turbo but not really sure if it has the power potential that im after.
All in all i think ill try out that 40R, if im not happy with it then go 35/40.

The following mods will also be done.
Street Port
3mm Apex seals
GReddy 3 row FMIC
comp fuel pump
850pri- 1600sec (are these ok sizes??)
3" exhaust
Power Fc commander + datalogit
3 bar map sensor
50mm wastegate.
Race gas (BP 100) - running on this full time

Boosted!

GT40R sounds like a good turbo.

Anyone know how it is compared to the GT42

Mean Machine

Talk to the guys at Magnus Motor Sports they make the kit and have tons of info on it. there is also a good thread around here. and there is a member on here who has it i forget his name at the moment... its all on that thread.
basically it spools fairly fast for its huge size and provides insane amounts of power through the whole upper power range.

rx7tt95

As good as it is, it's also around $6K USD which is just insane. Then again, it comes with TWO wastegates, 4" DP, etc...

caseypayne69

I got a buddy in NY that has a single turbo kit waiting on me for 3,000 even whole sale price. i thinks its a T40r something. Well its the one that go's on the WRX only bigger.

fastrx7man

iTrader: (63)

I ran 11.7 and have trapped 119.94 MPH and I only am making 335rwhp. (I love the stock pea shooters )

I think 415 rwhp should get you into high 10's.

But like many have said...a lot depends on the driver

Conv.WS6

Without a doubt 11's, 10's would take alittle more effort and practice. 12's on a single would be kind of funny actually. See the guy spin all the way up the track.

bradrx7

So nice to see "Church"'s build go into the danger zone. These days, we have SO many great new tools to build track cars. The wiring options alone are great. The harness I built for my Bonneville-raced 750 Honda far outshone what was in my old CYM track car.

Carlos Iglesias

iTrader: (6)

What? WHAT?!?! Does the Ghost of <Track> Days Past summon me from a more innocent time?!? Indeed all to my delight! Now I just need to take a road trip south to check out your marvelous 2-wheels toy

bradrx7

LOL, the bike is gone, hermano. I was mid-build on a new, better unit when my Bonneville racing friend, Jeff, passed away (lung cancer.... don't smoke cigarettes, kids) which took the proverbial wind out of the projects' sails. These days I spend my time around cars that are outside our art gallery.