is it worthwhile changing my vf 28 to a TD05 18g,am i likely to see any benefits,looking for 350ish bhp but more importantly a low 12 sec quarter mile time,bottom end should have no probs with arrow/omega/acl etc

 

16g will do that

 

1/4mile target anyhow...

or 18g for a bit more power

 

what about the 20g?

 

iv got a sti type r v5 with the vf28 turbo and im running 274 bhp atw,,,

i think thats about 345 atf

so i cant see any reson you need to spend your cash on a td05

you might aswell go fo a turbo that can go to 400+ as you always want more after a month or so

stu

 

i have the same car stu never had it on the rollers but my best time is 12.6 so far New bottom end is going in soon maybe,i dont do trackdays or anythin in it only quarter miles,not chasing numbers on a rr just looking for something that will take low 12/high 11 without going overboard,i know how easy it is to get carried away with cars

 

i think 350 bhp will only see you in the 12.4/12.5 times
if you want 12.1/12.2 and below ,i think your going to have to go down the md/sc/garatt turbo route

stu

ps,,,ill let you know the next time i go to york drag way and let you know my times

im also looking at turbo/injectors/ppg next year ,,then i should be 450 bhp
and in the low 11's (hopefully)

 

While it is very early days with my 20G coming from the factory VF28, I am enjoying it thoroughly. While the boost does seem to be moved up the rev range a bit (VF28 is a far better all round turbo imo, once she is 'in the zone'), the car pulls really hard right up to the redline. I never used to ever hit the rev limiter but I hit it 3 or 4 times at the weekend alone as the car just charges! I have adjusted my driving accordingly as the rev limiter makes me grimace, don't like hitting that at all.

 

bob'5 i remember you having a crazy quick time under 12 secs with around 340 bhp what was the spec of your car then

 

11.7s@119mph 340bhp TD05-16g

 

that is a very fast time for the bhp, how did you manage that? or is it lots of pratice?

 

Just as an alternative... keep the vf28, and the nice, quick spool, and get it mapped for a 10% methanol/ v.power mix.

You've got to get it mapped, whatever you do.

The methanol can be had for 64p/litre...as you are replacing petrol at £1+ litre you're slightly reducing the cost of a fill up.

This should be worth 20-30bhp on a like for like set up and see the little vf pushing 350+ and great response with supporting mods.