E85 Vs Water/meth Injection

[ARTZ]

everything runs cooler on e85...everything, I got back form a 20 min drive the other day and could put my hand on the heatshield and hold it there it was barely warm..

If you want a stock motor to last, stick to a safe 260-280rwkw on a sensible 16-18psi.

so 300kw @ 17 psi is not safe??

[AngryRB]

ok well sounds like 300kw on whatever boost with E85 to make it safe as possible and hopefully a fat mid range and ill hang my hat up n call it a day

[scotty nm35]

Exactly, if you can keep the combustion temps down and knocking under control your engine should last for a fair while powered up, as long as you don't track/thrash it.

My stock pistons after 7 years running stock, nearly 3 years of e85 abuse and countless (hundreds) of dyno runs, just a quick wipe down and they look good as new.

[R31Nismoid]

well going off the tuners advice, once again here, i was told its the heat that kills the motor, the 98pump fuel when you get too high in boost you start going backwards, and the exhaust valves start to burn

Not really the valves... The issue is simply detonation/knock (there are many other things, but lets just keep it simple).

You simply reach a limit where boost & PULP (& E85) don't agree. Pushing further will end up in detonation which will eventually see the rings/bearings shit themselves or similar.

Problem is the fuel variance for one, you get a batch of fuel that is *slightly* out, combined with a tune on the edge = you are f**ked. Most tuners a conservative and this will never be a problem and the motor should last for a while... How long is a while? - how long is a piece of string?

So then what it comes down to is motor age, condition, servicing etc. If you haven't owned the car since new, then how do you know how it's been looked after for the 10-15 years prior to you owning it? Fact is, you don't. It as also built on a production line, not two motors are identical as well with clearances, quality of the parts etc. Hence some cars make more power and some make less (in factory form 10yrs down the track).

You need to remember pushing 300rwkw is essentially doubling the factory output. It's just age at the end of the day. A shit tune will obviously hasten the death.

I mean I've seen stock RB26's circuit raced for 2-3 years over 300-340rwkw, eventually they start to breathe as its just a simple case of worn mechanical parts. Or stock RB26's with udner 300rwkw spin bearings driving round on the street... Nothing is indestructable.

The golden rule is this: If you cannot afford the rebuild, then don't chase the power.

It's proven a RB25 will take 200-270rwkw day in, day out for a very long time (look @ PaulR33, making 200-210rwkw for over 100,000kms). Ask more of it, well it's all a gamble really.

[ARTZ]

On that note spinning tyres will result in needing lots of new tyres which is also an expensive habit.

Lets remember also the beauty of the boosted engine is you can turn the boost/power down.

So you run a safe 250 or whatever most of the time and only crank the power right up when you really need to, with setups its as simple as flicking a switch..

[jet_r31]

That sounds like an interesting prospect, anyone know much about that?

Unfortunately not, apart from hearing of some older guys playing around with the idea and testing it on a turbo 180B datsun in adelaide at some point 6-7 yrs ago at a country airstrip down victor harbour way

i never did find out how it went or there findings, would be interesting

cheers

darren

[jet_r31]

E85 vs wi, with most people its a no brainer if you have access to E85, its just simpler to setup once you have

the fuel size sorted and its easier for the end user, especially if they are as not mechanical minded, however if you like working on cars and tinkering a bit , water injection is a lot more fun to play around with.

cheers

darren