trevsjwood

iTrader: (2)

I'm running a VF34 AT 350BHP/333LBS/ft and considering an upgrade to one of Harveys 20gram or ST380.
I want a good road car with around 380bhp.
Has anyone made a similar upgrade and what effect transfered to the road.
I can understand the car being more top-end but did it lose something along the way?
Was it much different between 4-6000rpm or did all the benifits come higher up the rev range
Appreciate any views
Thanks
Trevor

GazTheHat

With the 18g, I'd say i lost only a few 100 RPM of spool over the VF35. I didn't go with the 20g due to the comments of tuners/mappers and owners. The difference is only right at the top between the two and the earlier spool of the 18g makes it a quicker road car.

The car is quite brutal now.

Mother Theresa

I did a similar step up with vf35 to a 18g. The latter is a much more tractable turbo. In my car I think the spool was a tiny bit later with the 18g but it more than made up for it once spinning.

trevsjwood

iTrader: (2)

thanks for that Gaz, yes my advice was the 18 over the 20.
Cheers
Trevor

Butty

iTrader: (2)

I remember following you around the Prodrive circuit. You may have had a slower spool rate but you had noticeably more torque than my VF35 out of corners.

Trevor - if you were running the VF34 without methanol then I'd also say the 18g, but the gap isn't going to be so clear cut if you also abandon using the funny fuel.

Is there such a thing as a TD06/18g?

Nick

trevsjwood

iTrader: (2)

Thanks Nick, yes I'll be sticking with the meth, it's not an everyday driver so I'm happy to attend to the detail.
Trevor

Butty

iTrader: (2)

Seeing that the ST380 is some sort of 18g hybrid, perhaps that's what may be the TD06/18g I'm thinking would work?

trevsjwood

iTrader: (2)

Harvey would probably be able to shed some light upon that