sxysweed

D16's bend rods in high torque engines.
D16's kill pistons from detonation.

So I've read Vitara's are 'semi-forged' or some shit making them stronger and you use stronger forged rods. But is it the lower compression that you get with Vitara's that makes them so much stronger or are they really a good bit stronger than OEM cast pistons? Would Vitaras/FJ Rods hold up to maybe 220whp/200ft/lbs in a 11:1 motor (on E85)?

Anf for those that will eventually ask why I'm considering running 11:1 in a turbo motor, this dyno just about explains it. The guys newer engine made more power/torque, but it's still exactly what I want out of a motor.

rangcrx

i think they cast them with less silicon then oem..

BlackWind

thatd be a sick single cam...im thinking about going the sohc route. Itd be a tough adjustment after the b18c i have now, lol...

zhillz

It's a known fact that tuner toy rods and vitara is the cheapest build and is good for 400+whp

You need to stop seeing that "some people" can make power on high compression and such and stick to what is proven.

Another thing I have recently herd that you might want to look into is higher PSI vs less retardation. I'm not sure on the specifics but I'm not looking into a turbo atm so thats all the info I have.

88_Hatchy

Vitara pistons won't yield anywhere close to 11:1 compression. The only way to get them close to the deck is to use custom length rods (yes, I know who makes them). Even then, you're looking at 8.5:1. I don't think this guy is even building an engine...

wakeking48

Exactly what i was thinking i had a whole vitara setup planned before i sold my hatch and 8.5:1 is all your going to get out of them

sxysweed

Stock D16 Rod Length: 137.00mm (0.067" bellow deck)
FJ Custom Rod Length: 138.63mm (0.003" bellow deck)

D16Z6 Head Milled ~3mm + FJ-R Rods = ~11:1 Compression....
3mm is a bit extreme. I know close to 2.5mm can be done on the Z6.
Lost the exact #'s to get to the quench pads on the Z6, but I know it's like 2.5mm...

Anyways, back to topic. Do Vitara builds stand up to 400whp+ becuase the low comp (and they make power at high rpms, and at high rpms detonation isn't as likely, something about spinning to fast for detonation to happen, blah blah) or are they strong enough to stand up to some detonation?

Not building a motor yet. Researching different build ideas first.

zhillz

What is your power goal and you wunna go boost right?

stock d16 - 225ish
stock ls - 350ish

Id obviously go ls.


Why are you asking about e85? we don't have that in tampa last I herd and only 1 in orlando.

sxysweed

225whp, max. Massively awesome power curve similar to the dyno I posted at the top.
Staying d-series.

I'm in SoFla. Lots of places with E85 down here.

Edit. I'd have to do a built block to get a similar graph to the one at the top (and have it last).
This is what happened to the guy's stock rods.... His thread said no signs of detonation, bearings looked fine.

oldschool98

I belive one of the things with Vitara is the ring lands were much lower down the piston leaving more "meat" in the hot area.