I know the s256 is capable of supporting more HP, but I dont know if I will ever mod it that far. So, here is my question

ZFR + fully bolted + tuned + drag radials+ drag bags + stage 4 clutch ( stock cams staying under 7000 rpm )
V.S.
S256 + fully bolted + tuned + drag radials + drag bags + stage 4 clutch ( stock cams staying under 7000 rpm )

I dont care about HP. I care about real world results. So, between those choices which turbo would win in each category?
300ft, 1/8, and 1/4

I might one day upgrade to a ported head and cams combo, upgraded trans, built motor, but you never know what life is going to bring. And if its worth it to put that much power down on a FWD car, or for the same price as moding a RWD muscle car?

 

As long as you can launch both decent the 256 will win hands down.

 

Is that because the 256 has more of a top end or what's the reasoning behind that?

 

In drag racing your always on the throttle and over 5000 rpms so the turbos always in the power band after the launch. Therefor the bigger turbo will win because making more power.

 

I understand that the 256 will make more power up top than the zfr. But, will it still make more power in the 4k-7k range than the zfr?

 

You asked about drag racing. I answered the question on drag racing. zfr will prolly make more in the 4-5k range, but your never less than 5k , I launch over 5000 rpms and drop to about 4800 and then am never less than 5500 again.

 

Lol yes you did. thank you.

OK lets take this to the extreme. Why not a s259 or the s262? staying under 7k.

In other words at what point would a big turbo not make as much power under7k?

 

dosnt the 256 come in batmowheel too?? I wonder how that would compare to my 5857

 

I don't think the 256 comes with the crazy wheel, 259 and 262 do. As far as borg warner turbos 259 is where I would stop unless you want a crazy hp build. A 6262 is a better option than the 262 because the inducer is a little bigger and the exducer is smaller by a little helping spool a touch. Also the exhaust wheel is smaller on the 6262. Staying under 7k I would stop at a 256 in all honesty. You can prolly make the same power with a bigger turbo or more power but the curve is going to be worse.

 

my bad its the 252 and 259 that have the option for the batmowheel

 

I didn't know they did for the 252. That's cool

 

ya just checked bullseyes site

 

drag radial wont hold. you need slick to put your power down even a S256 or zfr.

my friend has a zfr and MT slick and something in 3th gear, tire get hard time

he has a HHR ss. 12,8 111.
Vs a mustang Boss:

 

how to BO like it should be
one spin in water box then BO in second gear. drop clucth at 5000 rpm
viva KY stg 3

 

What do you mean by something in third gear, tire get hard time?

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something in third gear, tire are spinning. lower tire pressure can help

 

I never heard the tires spin. Maybe clutch slip

 

not on our video. but better to get tire pressure right, his tire was spinning in third gear. 17spi was to high

dont forget that hhr has a différant weight distribution

 

I agree. Mine every once in a while will slip third. I have a ky stage 3 clutch and doesn't hold the Zfr full potential.

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Only 111 trap speed on a zfr?

 

Its only on 93. I trap 112-113.

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Its a little low compared to by test run on 21psi granny shifting the EFR in my cobalt i trapped 119 and it was just a test run.

 

Ya but you also didn't run for a time then if you granny shifted and it was test run. It's different when you actually run. There was a guy at the track Thursday with a 2014 ford gt twin turbo trapping 134 @ 13-14 seconds. He was babying first and second and hammering 3-4 to see how high he could trap. Hell when I was on stock turbo and just a tune when I **** 60fts I'd trap at 111. Then once I got my technique down my speeds got lower but my times got faster.

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111 mph for a zfr hhr is good

his hhr k04 tuned was trapping 105

hhr has diff gear ratio.

i trap 108 on street tire but againt him it is a other story

 

I was never coming in here to say otherwise. All i said is it was lower than i expected either way