aLmk's 400whp budget build

[aLmk]

Yeah I'm pretty excited to see the results. Vit is confident we can get up to 440-450whp which is like a 80whp gain with just fuel! That's nuts!

[Si Speed 317]

Yeah I'm pretty excited to see the results. Vit is confident we can get up to 440-450whp which is like a 80whp gain with just fuel! That's nuts!

Thats awesome, shows how important tuning is!

[aLmk]

Yeah and nearly all, if not all the gains, will come from ignition only, as my boost control solenoid is already at 69% duty cycle.

[Spaz]

^that is great

[aLmk]

So went for my first real pull with the race gas and a tune for it this morning and I think I hit boost cut for the first time, but just for a split second. When it was happening I thought I was misfiring or something and let off, but after looking at the log there is not one knock in the whole thing and at the point where I felt the hesitation my injector duty cycle had gone to 0 and then instantly back up to where it was and the pull continued. It was not nearly the violent experience of boost cut that I had read about, but perhaps that's just because I 'barely' hit my max boost of 17.5 psi.

[aLmk]

What do you guys think about this? I originally thought it was me hitting boost cut, but I took a closer look and my tplate never goes down, however my injector duty cycle flat lines to 0 and my afr spiked really high because of it. Yet, my AEM wideband never read about 13.5, the stock wideband read ~25 for a very short time, then my injector duty cycle came back and everything was fine. Also boost cut is set to 17.5 psi, however a little before this, during the pull, my map sees 17.7 psi and nothing happened. Thoughts? Apparently I cannot attach the datalog...

[Si Speed 317]

Weird... Let me ask Steve

[aLmk]

Just went out for a spin with boost cut set to 18 rather than 17.5 psi and all is well! Didn't hit boost cut and everything looks good.

[Si Speed 317]

Awesome, how did you figure that out?

[aLmk]

Well I set my boost cut to 8 psi and went out for a little drive to see what boost cut was like, because I had yet to hit it. I dataloged me hitting boost cut and took a look at it when I was done, and the car did the same thing as what it did yesterday during my third gear pull. Only difference being with the 8 psi boost cut as soon as it cut it would continuously cut over and over because I kept hitting 8 psi, whereas during the third gear pull it cut for just a moment because I barely hit peak boost and then after it was done cutting it continued to pull higher because boost started to drop. So when I went on my ride today with boost cut set to 18 psi I did a third gear pull and I did not hit boost cut and the car pulled just as it normal would, just slightly faster I looked at the datalog when I was done, and it appears I hit a max boost of around 17.5 psi, and afrs were on point the entire time. So, I'll be going to the track tonight with the race gas in the tank, unfortunately the tune is not complete, so I am not getting everything out of it that I can, at least I'll know it will be perfectly safe and I am making a little more power than the last time. Hopefully I can improve my times!