leecavturbo

my afr falls from 11.0@4k to 10.3@the top
much gain to be had from leaning up?

recompile

iTrader: (38)

Definitely. Depending on how aggressive your timing map is, you may need to dial back a degree or two when you take out that much fuel, but it will net you gains upwards of 20whp

leecavturbo

ok thx

GST Motorsports

iTrader: (8)

20whp from just changing fueling from 10.5 to 11.5 afr? Is that what you are saying?

nothere

iTrader: (23)

it will save you some gas. and in my experience the car will feel better.

depending on the afr I have seen 5 mpg up to 8 mpg on a race track. the 8 might be responsible for the new motor though.

EVOIXreno

iTrader: (18)

there is actually no definite answer... it's here in Reno I can tune for 11.5 but I don't gain any power going from 11.1 to 11.5.. even with adjusting timing. so you might be able to lean it out some and add 5- 10 whp but 20 is a considerable amount. just my .02

JohnBradley

iTrader: (30)

anything under 11 will lose power unless its spraying methanol at the same time. 11.0-11.5 is about a draw, but a little leaner starts to pick up a little power. I wouldnt quite say 20whp, but 10whp definitely.

TTP Engineering

iTrader: (465)

Leaner is meaner as long as the EGT is under control.

What is the octane?

crewdawg130

iTrader: (16)

Thats old school i like that!

whats next " If you aint knocking you aint rocking"

its the UK so it cant be much oct

TTP Engineering

iTrader: (465)

Typically 98RON is 92.5R+M/2 USA method.

crewdawg130

iTrader: (16)

when i was in germany, might as well put moon shine in my silvia but yes in kindda 93

leecavturbo

uk vpower which is iirc 98ron? uk spec

HermaN

UK Shell V-Power is 99RON according to Shells website.

sponners

yep, vpower is 99ron (sure it says on pump)

we also have tesco99

and bp 102 (but that is way too expensive)