Which turbo upgrade?

[GTR Dreamer]

Hi all,

Looking to upgrade stock turbos on our MY09 R35. We have made a few mods and use a flex fuel system to run E85 at our local drag meets where we are getting consistent 10.61-5 runs.  Stock turbo's are sitting on 18-19 psi at 3500rpm, which is fantastic off the line, but don't have the carry through for the top end.

Any suggestions on upgrades that can hold boost through 7000rpm without giving it up in the mid range so we still have the launch advantage?  Not looking for a record breaker, just want to be closer to the 10.00 mark and have drive-ability - around 700 hp-ish?  Prefer to keep the stock housing and just upgrade the internals.

Any recommendations?

 

Thanks 
Nic 

[BLISTC]

i run the EFR6758R turbos and they are the fastest spooling stock frame turbos you can possibly get at the moment. one guy in the club ran 10.075 @ 140mph and 20" street tyres and another ran 10.026 @ 144mph with drag radials with these turbos on stock motor (but upgraded gearbox)

I ran 9.942 @ 141mph on street tyres and a not so perfect run. With my drag radials and a better launch, and smoother run (not hitting redline when shifting lol - these spool quick!) i hope to get to around the 9.5 1/4 but the main difference is i have a built motor so i can run more boost.

Cheers