E85 petrol

[PRIMRK]

I saw that the petrol station next to Southland (in Vic) is selling E85 now, As im building a 7AGTE i may have a look at using E85 as its track only, think it would eat foam filled fuel cells?

[pornstr20v]

i have a 4age 20v n/a 12.1comp from 90kws pump fuel to e85 im at 140kws now
car runs and feels better

best thing ive done

[MR22ZZ]

got dynos for those with A/F showing, would be interesting to see.

any other mods to get that number?

[trdee]

Your logic is arse about If the situation allows you to increase your CR you would, why on earth wouldn't you (bar having to buy stupidly expensive pistons)? That's all i'm saying

That's where MWP is at. For the power he will make, it makes sense to go for the highest CR he sensibly can (just like the WRC did). A 10:1 4 cyl will make 300rwkw easy peasy, it'll do it at lower boost than a lower CR setup and shit all over it for response.

If you start chasing 400, 500rwkw then sure the boost/CR/Det equation gets trickier and you need to 'compromise' somewhere.

Turbos are no different to n/a, the engine is just a pump, it doesn't know there's a turbo bolted on, just that there's more air getting stuffed in. Know of any n/a cars where they drop CR to make power?

you aren't understanding what im saying. i'll write something more comprehensive later but for now gtg watch f1

[JustenGT8]

It's all good mate, i know exactly what you are saying and if we were talking turbo tech of 20 years ago i'd agree 100%

[trdee]

the technology has improved, but the relationship between static compression/dynamic compression/boost/fuel octane/etc and knock is still the same.

Example *(arbitrary figures)*: You are running 12psi and the highest possible CR you can get is 11:1 and you make 200rwkw

You then increase boost to 20psi. Your highest CR MUST be lower now. Let's assume its 10.5:1, and now you make 240rwkw.

That's all I'm saying. Assuming you are pushing to the same peak cylinder pressures, and all other things are equal, more boost/lower compression will always make you more power than low boost/high compression, the trade off is off boost response and turbo lag. Otherwise why would turbos exist? lol

[JustenGT8]

the technology has improved, but the relationship between static compression/dynamic compression/boost/fuel octane/etc and knock is still the same.

Example *(arbitrary figures)*: You are running 12psi and the highest possible CR you can get is 11:1 and you make 200rwkw

You then increase boost to 20psi. Your highest CR MUST be lower now. Let's assume its 10.5:1, and now you make 240rwkw.

That's all I'm saying. Assuming you are pushing to the same peak cylinder pressures, and all other things are equal, more boost/lower compression will always make you more power than low boost/high compression, the trade off is off boost response and turbo lag. Otherwise why would turbos exist? lol

I totally agree ...but, that has nothing to do with anything i've said Reason being that the situation is far removed from your hypothetical. We are in same boost/higher compression and aiming for the largest area under the hp curve.

Anyways, 9:1 appears to be the easy number for MWP so i'd say go with that above 8.5 for sure.

[trdee]

ya, i was just saying that if he's happy with how it's behaving off boost at the moment then he could just increase the current boost limit and make a bit more power instead of messing with pistons, i may have gone a bit off track

[jono]

i was all set to go 875cc injectors and e85 in the falcodore, but caltex didn't deliver the goods in time and then the price of fuel dropped and my loving handbrake froze all the funds!

[MWP]

Well i got a quote from CP for custom 10:1 pistons.
$712US vs $561US for the 8.5:1.

Also skirt coating are 26.00 more per piston and ceramic coating is 26.00 more per piston.

Hrm. Damn decisions

[The Witzl]

Aussie dorra is super no.1 performance today at around US$0.96.
I'd say it will stay around this figure for a little while, and maybe even jump up a notch or two if the RBA ups interest rates next week.

What im saying is - the dollar is damn strong now, so it might be worth your while looking at the more expensive option, if thats what you really want!

[JustenGT8]

Well i got a quote from CP for custom 10:1 pistons.
$712US vs $561US for the 8.5:1.

Also skirt coating are 26.00 more per piston and ceramic coating is 26.00 more per piston.

Hrm. Damn decisions

$160 difference...what are you waiting for? 10:1 for sure Ceramic coating is a luxury rather than a necessity.

[oldcorollas]

hmm.. 10:1 pistons.... and more fun

or 8.5:1 and 20 big mac meals.......

[MWP]

Hah, yeah, its a no-brainer when you put it that way

[MWP]

Well i got a quote from CP for custom 10:1 pistons.
$712US vs $561US for the 8.5:1.

$633US for the custom 10:1 CP pistons from a different seller.
Ordered!!
Along with Eagle rods and ARP head and main studs.