Well things are kinda boring around here so I decided to fire this thread up just cause. I decided to ditch my S252ET in my LSJ-T and pick up an S257FMW from OTTP. I live in Canada and drive down to Merica to fill up drums of E85 so I can run E47. I do shift work so its taken a bit to get things organized and done with this project. In the spring I pulled the trigger on an S257FMW and Walbro 450 fuel pump from OTTP to upgrade my car. I had a problem with major boost drop to redline the last couple years no matter what I did. Turns out my set up was outflowing the S252ET.

With Infraredline as my tuner we started at it yesterday. I installed a mini AFC from ZZP so I can turn the boost up and down on the fly. But the base map he sent was pretty damn good for what we needed. Wastegate pressure makes around 22psi. We decided to turn it up a little to 24psi but quickly noticed this turbo compared to my 252 builds boost all the way to redline. Started at 24 and would end at 26psi by 8000rpm. Going to keep pushing tuning wise and I will be hitting the rollers shortly. Here's what's under the hood for those who don't know. Stay tuned

- Gen 3 Stock Short Block
- ZZP Turbo Kit
- S257FMW Turbo
- 80 lb Injectors
- BRFPS
- Supertech 75lb Valve Springs
- Ported And Polished Head By Lsjion
- ZZP Stage 2 Cams
- ARP Head Studs
- ATI Damper

 

Nice setup, I bet you are making big power. How is traction- what tires/size you are running? Are you confident in the stock lower end? Are you running a 4.05 trans? I bet it hauls ass, nice job.

 

This. Be careful with that ldk!

 

Very nice man! I'm a bit jealous. In for videos when everything is all done.

 

Traction isn't the greatest at the moment lol. But it's not terrible. It works really well on fresh pavement. Just pedal though otherwise. I'm on a set of Yokahama S Drives 225/40-18. Drag radials are in the near future. I'm going to push the bottom end past 500whp. It's seen around 430whp the last 2 years without a hiccup. Yes I'm on a 4.05 trans.

Everyone that I've seen break these motors (rods) have been well under what I'm making for power. I know we had the discussion in another thread about this motor. ZZP made over 500whp with an LDK in an LNF all summer when they first started to sell this motor as a short block. That's why they pushed "makes over 500whp in its stock form" for a couple years. Now they put a disclaimer that they recommend pistons and rods past 400whp to cover their ass.

I'm gonna push this LDK and see what it does. If it snaps a rod, well then I'll deal with it when I get there haha. If it survives, it will get pistons and rods over the winter and I'm going to crank up the boost.

 

Nice man your car is Def one of my all time favorites! In for some vids

 

Nice man can't wait to see this beast hurt some feelings

 

in for some Vids

 

In for results!

 

How's the spool with the s257?

 

According to the OTTP website is spools about 100RPM faster than the S256.

 

On a 2.4 i can easily make wastegate pressure at around 2500 in a high gear.

 

wish you were close, im selling some 245/45 drag radials.

 

We went out cruising the other night and I got to see it do a couple short pulls, nothing crazy but 'eff me! this thing is a beast.

 

We need pics and vids

 

Lol! Thanks Mike. The car is feeling really good. It's on 27psi right now and still may turn it up slightly more for kill on the dyno. I've been stupid busy at work but tuning is coming to a close and it's almost ready for the rollers.

Heres a couple quick car and motor shots. I'll have vids up soon enough haha.

 

Baby injectors man. Step it up some more and add more fuel.

 

Yeah it pulls damn good!

Not as hard of a hit as the 262 down low but It just never stops pulling.

 

Actually the 80's are handling it quite well. I'm only on E47. I don't want to push the stock motor much more than I am.

 

I'll be strapped on to the rollers Monday. I tried this dynojet 2 years ago and they had issues with reading a tach signal. Seems to be a common issue with Cobalts there for whatever reason. But they changed a few things and my buddy with his LSJ-T worked last week so I'll give it another shot. They said if they can't get the tach signal to read after a pull they will just unstrap me free of cost.

 

Nice man good luck

 

zzp's turbo kit looks so mint for these cars

 

Good luck and let us know how it does.

 

Well started my birthday off right this morning getting in the rollers. Was kinda hoping for a little more than I made but was a super humid morning. And really I don't know what to expect with this Gen 3 motor and turbo set up. I've kinda been the Guinea pig for it lol. Those who say LDK rods are weak are wrong though lol.

I was having some sort of issue on top end judging by the graph. Interceptor showed no knock. I forgot my computer, was going to log the runs. But there's still a little head room left if I can flatten the curve out up top.

505whp/368wtq on 30psi

 

500whp happy birthday.