Rb20 E85 Gt35 0.63. All On By 4500?

[joe blo]

hi guys. thinkn of a rb20 setup on e85. could i get full boost by 4500 of 25-30 psi using the benefits of e85?

[34GeeTeeTee]

Nope, If a 25 only just does it then you probably have no hope with an RB20 Just my opinion haha

[bcozican]

nope dont think so

i ran rb22 on e42 (50/50 mix) with hks cams with gtx3076 with 0.63 and all the bits, nistune ecu

23 psi and 430hp on a hubber and it was 4700 im pretty sure

rb22 full e85 will 0.82 rear and vipec ecu , cams dialled in etc was 23psi at 5000

[Roy]

My turbo is a ways smaller than a GT35 but I can tell you going from 98 to E85 made stuff all difference to response. If anything it is slighlty worse.

What is better is just how much torque the car makes, but the sensation of when it boosts does not change.

I think the GT35 is simply too big a turbo for any 2L unless you are going to have valve springs and oiling, PS and water pump pullys all geared so that you can pull 9,000rpm as the thing is unlikely to start making +250rwkws until after 5,500rpm.

Also, since you are looking at running a gob smack of boost I think you are better of going for a smaller turbine and compressor and driving it harder with a larger A/R turbine housing.Whilst the GT35 has a good sized turbine, pushing that air through a 0.63 housing may result in a peaky powerband that falls over up top. Better to go a smaller turbone and compressor with a larger A/R turbone for a similar power level but generally better torque band and better cylinder filling/exhausting

If you are going to run that big a turbo I also suggest you run a plenum. They seem to genreally further hurt response but they do tend to help the power in the high rpm range over 7,000rpm

[joe blo]

ok thanks guys. might just go with the setup you have roy. just wanna get 400rwhp and full boost around 4500 rpm.

was hoping e85 bring it on sooner and save me from putting a rb25 or 3 litre in. just a fun type thing not a full blown setup

[joe blo]

would i keep making more power on the td06 20g setup with more boost?

[bcozican]

400hp

rb20 + 3071 with .82 rear + e85 + supportings = bloody good fun

I had low mount i/w HKS 2835 with 0.87 rear 405hp on 21psi by 4200 (rb22) so rb20 be all that by 4500

[GTScotT]

Go the 20G like Roy, you will need E85 to reach your target of 300kw but also expect that to be near your upper limit.