You talk about it as though it's a walk in the park; if it was that simple everyone would be getting decent figures and not stuck around 150rwkw and mid 14's (look at the vast majority).

I'm not saying you aren't correct, but that is a ridiculously simplified view of something that is very complex.

its not a walk in the park, but its achievable

when you talk about most people maxing out at 150 rwkw, its because its their weekend hobby, playing with simple bolt on performance, over a period of time. parts from here parts and from there.... air intakes, cams, exhausts, etc. that how i did it, and how most members do their mods, part by part

most people are getting stuck at around 150rwkw, because they are still running std ecu's and std bottom ends. and have more than likely done 200,000km on these motors

the cars running well thought out mods that have been properly setup are hitting 160-170 rwkw without any bottom end or ecu mods

if you have the cash to do both of these things properly, then yes you can get there. the limiting factor here is cash, people are not prepared to spend that much on a car that is worth less than the mods, and then only to have a car that will just get into the 13s...

if you were serious about such figures you would go all out on a custom cam to suit the flow of a heavily modified head, a proper custom tuned aftermarket ecu, not an interceptor or J3 chip... a bored out, balanced, blue printed high comp bottom end that can achieve some more revs, and the list goes on...

would a custom tuned aftermarket ecu with a high comp bored out bottom end get me another 20rwkw? i think it would ... is spending somewhere in the range of 5k on such an exercise worth it, probably not... and probably the reason why not many people have done it...

point noted! 7500 is safe if you do the work on the bottom end, the rod and piston combo that those numbers are made off are heaps lighter and stronger than the stock stuff. All custom forged items. If you were to try and rev stock internals or even mild uppgraded stuff there it will be a dissaster.

To be honest everyone has different things that works and doesnt work .
Ive seen 3 or 4 different combos get up to 175kw .

Ive never seen more than 180kw for a na sohc on a dyno
ive seen a dohc get 196rwkw. That was over in sa at a kpm dyno day

throw a combo at me

i've only seen, with my own eyes, a couple of E-Series pull the 100+mph passes that 170ish+rwkw power should be achieving.
STOKEB was one, on an n/a pass, with slicks and c-series box from memory did 102mph? (this is a long time ago), another one 'RIPUR8' that used to get around that did a high 13 @ 101mph.
Both of those cars have/had JMM parts (expensive and jim is a C***, but hey, they actually work...)

couldnt by any chance throw a link to one of these programs? would be fun to have a go at one.

I reckon a custom set of pistons (with supporting gear) around 98mm (4.5l) would be the go. If you cant send a link to one of these calc's, can you mess around with that number and see how it goes?

still no reply

I've seen 180.4rwkw, with more to come from this particular car, it has a baby cam. A bigger cam and a good tune and it will crack 190rwkw

Goanna be a spoilsport here but we musn't forget that all dyno's are different when going for the glorious 190rwkw.
One may read 190 and another dyno may read 170. The proof is in the timeslip.

Just tossing in a few questions....

Would it be fair to say that a big cam is going to make an NA engine unsuitable for city driving? If the engine develops most of its horsepower in the top end, is it going to be a slug at slow speed and use heaps fuel?

Does the engine start to become more of race engine rather than a street engine?

factor in the rest of it the car can be a 13 sec runner,but try to get it every time,every day

factor in the rest of it the car can be a 13 sec runner,but try to get it every time,every day

i di have a high compression bottom end.. a unichip alos at one stage.. and saw a best of 176rwkw.. and a PB timeslip of 14.1 @97MPH.. 1.97 sixty footer on 15 inch rims.. street tyre's..

thats true. but we saw that when we took off the unichip it made the same power, so i think the tune wasnt all that great. and your bottom end was going though oil like an old holden...

increased bore capacity with high compression and a well tuned quality ecu, can get you there