Hey everyone, I'm hoping to get a little advice on a turbo upgrade. Has anyone run the old Greddy TD06-25G kits? Or has anyone upgraded the CHRA to a modern ball bearing set up?

I'm debating getting one of those and dropping in a ball bearing CHRA with a billet compressor wheel. I love the idea of a classic kit with modern technology. But I'm worried it will still be too laggy for my taste. I've heard they spooled pretty quick with the old journal bearing, so it would be nice to get a baseline/worst case scenario. Does anyone have a rough idea of what rpm they start building boost, and when they hit peak boost?

My other option is the stage 1 drop in BNR CHRAs. Anyone run those? I would be curious if 330-350hp is realistic or a little on the optimistic side.

My favorite turbo would be the efr 7670, but I just can't justify the expense haha.
My ideal power goals would be 350-400hp with lots of low end.

 

I'd be checking to see if there have been any meaningful aero design improvements on the turbine. If you are trying to stay original equipment manufacturer on periodish type turbos a tighter budget Borg Warner SX-R or Garrett GTW or GTX will probably have a better performance envelope/compromise for what you are trying to do.

 

Thank you! Yeah I can definitely look into those options!

 

the Greddy TD06's got an upgrade last year sometime https://www.trust-power.com/products...a0-16%e3%8e%a0

 

Is it only the compressor or turbine as well? Turbine efficiency is arguably more important as everyone can slap on a half decent billet compressor on a rebuild now.

 

Thanks for the link! That 20RX looks like a great turbo! Definitely a step up from the old 20g or 25g

 

all i know is what is on the Greddy site, which just shows the compressor.

 

Great article I think is relevant to the topic and I agree it's very cool how these old turbos are being retrofitted. They found a ton of headroom with no loss in response on their test vehicle. In this day and age, I'd be surprised if you couldn't find something out there that would also be a reasonably cost effective equivalent for the FD.

https://dsportmag.com/the-tech/bad-a...-civic-type-r/

 

I prefer the HKS turbo kits for the FD over Greddy kits and HKS has consistently upgraded the components of their kits.

HKS uses Garrett turbos and tweaks them to be a better fit to the individual application.

A couple years ago they upgraded the turbo in their kits to the GTIII spec turbo.

About 10 years ago they redesigned their FD cast manifold for better WG prioritt and published the charts showing the higher rpm emap to boost crossover in their advertising.

They upgraded WG size to 60mm to fight boost creep.

They offer the components individually.
Manifold
set-up kit (manifold, WG, Downpipe)
full turbo kit

RE Amemiya exclusively uses Greddy components (a deal) and many of their builds (such ad their touge mahou) use stock or upgraded stock twins and I speculate its because the Greddy single turbo offerings for FD arent all that great.

Feed uses HKS. You can follow their touge mahou upgrade from the T04Z kit to the nrw GTIII kit.

 

Greddy has done some upgrades as well.

Their crack prone tubular manifold was redisigned with a single WG runner moved up to yhe collector to eliminate some crack prone areas at the slight expense of turbo response.

Again, I prefer cast HKS manifold for a reliable system.