I apologize for my lack of reading.

Went out for some logs and realized that I have had my wideband calibration wrong the whole time I have worked on this project... I reset for the correct AEM cal and did some fueling work, it was actually pretty close before I futzed with it.

I did get one 5th gear pull though. I think the power spike in the previous graph was an artifact from hitting a bump doing a 3rd gear pull. The 5th gear looks a lot more... plausible.

I felt like the car was a little down on power, so I hit the drag strip. Naturally I broke a couple small things, but the engine has been flawless. What think? Down on power for 19 psi on a .86 a/r gt2860?

https://cimg0.ibsrv.net/gimg/www.mia...d9a783dc03.jpg

Power? No you're not down on power. 113 trap for 280 is actually good IMO

You're definitely down on spool and lowend, and 19psi is kinda high boost for only 280, but you already knew that. What's the spark map look like? or post a pic of log showing timing curve. Maybe you're really low on timing

I'll post the log from the last run. I think in 5th it was 12 tapering to 13.6º advance when I let out of it. I added a degree to the top two rows from this map.

https://cimg8.ibsrv.net/gimg/www.mia...2908c36cba.jpg

You've a built engine, unless you're pinging/knocking with more timing, that's way too low and you need to crank that baby up to at least get some of your torque back

I'm gonna do just that, but only when I can get on the dyno. Apparently my dyno guy has a bad graphics card or something on the dyno computer. I'm still considering a different turbo, like a gtx2860. I want my spool back...

I'd just get the most out of this setup as is if I were you. If you're spending 1200+ on a turbo replacement might as well sell this setup and go TSE mani + 6758efr and make like 400 on this same map and boost level

Does getting the most of this include swapping to a .64 housing? It's not really fun on the street, 2nd gear doesn't make real power until 5k

0.64 will be a good difference. Or maybe even go with a s15 spec turbo? Sounds like you're more consumed with low end street torque than top end bits.

And if you want both, EFR is the way to go.

probably the cheapest approach at this point would be to pick up a cheap used 2560 and just run #ALLOFIT

You'd still be able to make 275whp-300whp but have at least 200wtq by 3krpm.

Sounds like the cheapest option that'll be even more fun on the street for your use.

Nice time slip :bigtu:

Not really a viable solution because I want 40-50 more hp of headroom just in case I want to go on kill mode.

Same as above, I want more headroom than having it maxed out at 300 rwhp.

Thanks!!!

It sounds like you want us to tell you to keep polishing this turdy setup and get the .64 housing lol

...so do it :) and crank it up

(but secretly we will all be hoping you'll finally see the light and go EFR :D)

I'd love to, but spending that much isn't sonething I can do right now. Selling this turbo and buying a .64 gtx2860 or so with the current hot side is doable though. I'm just a bit unsure as to why this turbo seems maxed at 300 when it should make way more.

can you please post a current mod/part list? it's impossible to dig it all up in the walls of text

Na8 block and crank, no mbsp
Wiseco​​​​​​ 8.4:1 slugs and eagle rods
Stock vvt head
Square top with stock tb
Fm manifold and cast upper dp with 3" lower and exhaust
Gt2860r (not the potato)
Dw200 pump and gt500 injectors
Precision 350 hp intercooler with fm piping
EBC and 93 pump
​​​​​​rev ms3 basic
EBay aluminum radiator
6 speed / 3.9
Custom valved bilsteins 800/500 and rb/msm sways
Some more unrelated things

this is the turbo, right?
https://www.turbobygarrett.com/turbo...R_707160_5.pdf

looks like a giant turd. you need 3 bar pressures to even go past 300
so yeah I guess a gtx should be a good bump up

No that's the rb specific one. It's this one, dame compressor map though i think: http://www.turbobygarrett.com/turbob...argers/gt2860r