Scion XB 1NZ-FE Turbo build

[Focus_Sh1ft]

Nice numbers - scary lean AFR though.

Must be the high octane fuel and methanol that's keeping your motor in one piece.

[Blown_xa]

Good numbers man. If you talk to your tuner again soon, ask him what correction he entered. I see it says sae correction method on the sheet. If its the latest method, it accounts for atmospheric conditions and a 15percent mechanical friction loss. Regardless, numbers are far from conservative as sombody say opposite. 300hp plus from a 1.5l is anything but conservative. So cheers to that.

[H3LlIoN]

Sweet numbers. Curious...what are you hoping to run at the track? What were your E.T.'s on the old build?

[scioncrew]

man thats a realy good looking dyno gragh. hopping you will take it to the drag strip. good job on your build

[xnamerxx]

Check your fuel pump/lines/tune your running way way to lean I'm surprised you didn't melt a plug.

[H3LlIoN]

Also, this post got pushed to the side and I was hoping for some speculation from Aras. Thanks

Originally Posted by H3LlIoN

Sweet numbers. Curious...what are you hoping to run at the track? What were your E.T.'s on the old build?

[Yoda]

Waiting for the vid now so i can see it in action.

[xnamerxx]

Your running 15:1 afr at 5700 rpm's what about that screams yeah this motor is getting enough fuel. I have no idea what pump/pressure/fuel lines your running. Being that the afr only looks marginally good at 3-3.5k my guess would be that the fuel pump can't keep up. Just because it didn't blow up on the first run doesn't mean it won't. Id rather not see your motor that costs a pretty penny because your letting it run lean.
Unless your fuel system can handle another 30% increase in flow I wouldn't even have e85 on radar.

[xnamerxx]

Im pretty sure the power is giving up so early because the turbo is to small for the amount of power hes making. You can see it in the torque curve how it starts to die at 5k rpm's. Dont know the specs on his cam or the rpm range of the intake he's running but Id have to hazard a guess and say both are rated for something like 3-7.3k rpms but the turbo doesn't have the cfm to keep up.

If you look at the compressor map for the disco potato it gives up on at about 35 lb per minute with 2.2 bar. Rule of thumb is 10 hp per every lb per minute so easy math says 350 hp give or take 20 hp.

[cali yaris]

^ I think it would be good for the tuning community to know (and I would think you'd be curious too):

1. Why it was so lean.
2. Why the power curve gives up early.

Besides that, the low end power must feel very sweet. I don't have it down there any more.

Looking forward to seeing the video.

[Nexus1155]

Tial / Garrett GTX-2860 RS Turbo w/ SS Housing and Billet Wheel
Walboro 255l , Aeromotive regulator , Perrin fuel rail ,
Aerospace Components custom fuel block for NX kit
680cc Precision injectors

for xnamerxx ^^^

Does your standalone tell you the duty cycle the injectors are running at. Looking at that graph seems like you have something more to work with, like a handful of the people here say.

[xnamerxx]

Its a walboro 255 so it should be good for the power the injectors are 60lb which are again probably good for the power hes making. We don't have the fuel rail pressure nor do we have duty cycle so those are 2 unknowns.

But seeing as the Yaris was never engineered to have 350+ hp id be willing to be the fuel lines from the tank to the engine are to small.
Garm what are you running for fuel lines? 8an?

Im not trying to bash xbgod on his build to each their own poison but running that dangerously lean and nitrous will result in a nitrous backfire which will blow your intake off the car.
If the fuel issues get fixed and you run nitrous please do not go over a 50 shot with this small of a motor or you'l get to meet mr puddles and blow your intake up and probably wreck your turbo. Trust me with this I have nitrous on another car and I've run a 150 shot there is nothing scarier than watching your fuel pressure drop from 39 psi to 24 psi for a microsecond and jump back up.

[Nexus1155]

Hey man, don't worry about the critical posts.

Blown, I know you are knowledgeable, surely you must see the drop off in power and then a sudden lean condition. You see no problem with that?RPM still increased. he didn't let off the gas.

[xnamerxx]

No one here is hating on him they are all pointing out a giant problem with his afr.

Ever wonder why evos, sti, cobras, vettes, vw's, or any other car that has a forced induction engine runs at afrs around 12:1 or less its not because there trying to sap power from the motor its because running any leaner results in detonation/pre-ignition and combustion temperatures that are to high.




Hey what do you know on a STI the afr is less than 15:1 what a shocker and hey its running meth what do you know.

[Parmas]

Originally Posted by xnamerxx

No one here is hating on him they are all pointing out a giant problem with his afr.

Ever wonder why evos, sti, cobras, vettes, vw's, or any other car that has a forced induction engine runs at afrs around 12:1 or less its not because there trying to sap power from the motor its because running any leaner results in detonation/pre-ignition and combustion temperatures that are to high.




Hey what do you know on a STI the afr is less than 15:1 what a shocker and hey its running meth what do you know.

I don't know but that dyno is sweet still on the AFR which btw that is a proper tune for me..... Stoich off boost and low 12 on boost. I am really curious I can be able to make a tune map like this myself!

[cali yaris]

Every forum is full of haters and people who just sound off

^ Are you including me in that? I asked a legitimate tuning question, and congratulated him on his numbers. And the question remains unanswered.

[Blown_xa]

Originally Posted by cali yaris

^ Are you including me in that? I asked a legitimate tuning question, and congratulated him on his numbers. And the question remains unanswered.

Garm, like said already ...you are looking at the torque curve. The power hardly drops off. As far as afr's, im not gonna speculate. We have run 13.0 on our race car for good numbers on the dyno, it liked running lean. But after the insane power pulls were done we immediately corrected the afr's for racing trim. It may very well be the same in his case. Only his tuner can answer that question about the afr's on that particular pull, but what everyone failed to notice, is the pull ended early around 6000rpm . So my guess is the tuner let off knowing. The car may have made the best power on that pull so that is why it was posted. Only other reason for pull showing an end at 6000rpm would be because rpm's were based off roadspeed and the graph got trunkcated do to tire expansion.

[cali yaris]

^ I have a ported head with stock cams, so I don't think that's it.