Can anybody inform me what bhp the bottom end will go up to before changing pistons. How much for forged engine bits and head?

why would is doing it the first way so bad?? (again, just out of curiosity, i#m not planning on modding mine) that sounds like just basic bolt on mods, other than the raised boost. surely if you kept the boost down it'd be ok?? oh, and got better smic's?

Because there is a small margin or error with the basic kit as there isnt a stronger platform to take the hit if anything should go wrong.

 

What Leo is trying to say is, the better parts you put on your engine can take the larger power figures, and wont be putting your engine under unnecessary strain. With the basic kit, that unnecessary strain has a much higher chance of coming to bite you in the ass, hence is being expensive in the long run anyway as you'll be fixing it when it goes pop.

 

To get the higher figures you would usually require a boost controller, to raise the boost as its the biggest form of basic power increase. Better Smic's is good way to go as it allows better cooling of the intake air.

cool, so say (sorry if i'm getting on anyones nerves :( ) you had air filter, exhaust, decats (or divorced downpipes) bigger intercooler and chipped ECU, what would be the problem with raising the boost slightly???

Nothing essentially. 9psi is stock boost or 0.6 bar. From what i know 14psi (slightly under 1 bar) is around the max you want to go on these mods before you require better injectors. but there wouldnt be any problem at all, but as im sure you know all engines are prone to failure when asking more from it, its just when you provide more supporting mods, its less likely to happen. Taking care of it is a main factor, oil change, plug change etc. Take care of the Zed, and it takes care of you!

cool, cheers man :)

how does 400bhp compare to a standard car?? is it that much of a difference??

how does 400bhp compare to a standard car?? is it that much of a difference??

 

yes, a very noticable improvement in performance. Really brings the car alive.

 

As an example, here is a comparison test I did some years ago for my old TT Manual on stock boost and the on 1 bar boost.

 

2+2 TT Manual

Induction kit

Downpipes, decat and Catback exhaust

JD ECU

265/35/17 Falken-452 tyres

 

Several runs with each setup, best times recorded :

 

On stock boost it recorded a 5.5 secs 0-60 and 14.1 secs 0-100.

On 14psi boost with the same mods it did a 4.7 secs 0-60 and 11.9 secs 0-100.

 

Recorded using Nissan Datascan Diagnostics.

Never had that particular car dynoed but I would expect it to be around 360-370, so 400 would be an even greater difference.

Edited July 31, 201114 yr by Yowser

that's pretty impressive!!!!! 4.7 0-60 is hugely quick for such a heavy car!!!

that's pretty impressive!!!!! 4.7 0-60 is hugely quick for such a heavy car!!!

 

Its a decent time, and fairly typical for Most z's with the usual mods.

 

I wouldnt consider the Z to be that heavy though. Sure its no mx5, but its similar weight to most high performance cars - Skyline, Supra, M3, Porsche 911 and a lot lighter than many others.

 

I look forward to doing some timed measurements with my lightweight Slicktop though.

 

Its true though that the Z's real strength is in mid-range and top speed runs, rather than acceration from standstill.

Edited July 31, 201114 yr by Yowser

Its a decent time, and fairly typical for Most z's with the usual mods.

 

I wouldnt consider the Z to be that heavy though. Sure its no mx5, but its similar weight to most high performance cars - Skyline, Supra, M3, Porsche 911 and a lot lighter than many others.

 

I look forward to doing some timed measurements with my lightweight Slicktop though.

 

Its true though that the Z's real strength is in mid-range and top speed runs, rather than acceration from standstill.

 

 

still!! 4.7 is quick!!!!

i have a new engine. but i didnt put forget pistons in. (regret it now). i will be soon though;). i did however use acl raceline bearings, cometic gaskets, arp heat studs. the pistons where new though as was everything else on my engine. i believe with what i currently have i can get a good 400+bhp and my engine will be ok. but i am now wanting more so i have to get the pistons put in so i can get to 500 bhp:) as i just wouldent trust even my new pistons with more than 450bhp max

 

Why not wait til you melt a piston? You never know, they could be fine. Seems like a lot of effort required to change the pistons now, when they are in optimum condition, in an engine you know is A1 health wise.

 

Get your mapping done slightly conservatively or with a reasonable safety margin and my guess is, you'd be fine for few years? I'm no expert in these things, make no mistake, but still sounds like a lot of effort, when there doesn't seem to be a lot else you need to upgrade at the same time..

still!! 4.7 is quick!!!!

 

had pretty much identical results as Yowser with my car - checked with a G Tech pro meter.

 

stock time was closer to 6 seconds with mine from memory. 4.7 after mods was the best time I have ever seen.

 

not tried it for a while & have some new bits - may have to try again one day LOL :devil2:

yeah thinking bout doing some of these mods now, i really didn't think 400 would feel that much different, would the autobox be fine with these mods?? (intake,exhaust, decats, intercoolers...possible raised the boost to around 14psi)

The autobox will be fine with 400 BHP, IF it is in good nick, they seem to be dropping like flies lately, as they don't get looked after properly, and over 20 years, that neglect takes it's toll...

yeah, i'm wanting to do a manual conversion at some point, hopefully it lasts until then, i can't understand why people neglect things like that :(