Webby's tune

[webby459]

Attached are my dyno plot (sorry for poor qual), log from MLV, with spark and fuel maps, log data, and my msq. Take it apart.

It was on a dynapac hub dyno, tuner has experience with aem, but navigated around megasquirt well. I asked for a conservative tune, wasn't looking for maximum numbers.

Day was 90 degrees f, 90% r.h., piece of shit day for n.e., 29.86 in merc, which is 100.83 kpa. This pull ended up being 11.74 psi.

I run on 93 octane with 10% ethanol. It's a 1.6, bone stock, 100k miles with fresh bearings on bottom end only. No head work. 2560R, FM intercooler. 450cc injectors from Marrin. The pull was in third gear.

I think this is all you guys need, if need more, let me know. I'm not looking to blow shit up, but I am going to do something this winter, not sure yet whether I will build up my 1.6 with forged junk, or get a 1.8 lb to build up. If I go 1.8, I may do a budget build, with only forged rods and fresh rings, bearings, clean head, small valve job, etc.

[tyson87]

take out a little fuel around 4100?

[webby459]

tyson, I appreciate your reply, but I was hoping this thread would create energetic and entertaining banter. Did I post it in the wrong forum? Should I move it to engine or megasquirt?

[Braineack]

i wouldn't be too disappointed with the numbers.

The only thing you could really improve would be the fueling and boost. the spark map looks familiar . I have a feeling the rich mixture between 3-4K coupled with the slight boost drop is hurting your mid-range torque slightly. If you worked a little to flatten the boost and lean up that area i'm sure you'd see maybe 20ft-lb more torque at 4K and a gradually slope back down and meet back up at the 6k mark or so.

[webby459]

Thanks Brain. I may work at trimming that range out a little. I'm glad my spark map is ok. Two things, am I fat at the big end: mid 10 afr? Am I fucked out of headroom with the injectors: 92% duty at the big end at only 12 lbs?

[Braineack]

at 230rwhp on a dynojet my 460s were maxed, and that was at like 12.0:1 AFR.

[gospeed81]

I am running a nearly identical setup...12psi on stock 1.6L, RX7 460s, 12psi.

It's friggin' fast and fun.

I run just about 12.2:1 at the big end...and never see over 80% duty cycle. I plan to see a little more airflow when I upgrade the exhaust...but should still be fine on injectors. I will add WI when I go to turn up the boost anymore though.

Impressive numbers. Have you thought about a COPS setup?

[webby459]

Originally Posted by gospeed81

Have you thought about a COPS setup?

FUCK YES.

I am suffering listening to a misfire at idle, and an even worse problem when I spend a long time at cruise whereby the AFRs go way fat, and the shit runs like it's loading up or something. I pull over, shut off, restart, and it's fine for a while, rinse, repeat (Bill Gates involved in MS?) I didn't even bring it up because I got no logs, so afaik, it isn't really happening. I don't want to spend my schekel on wires, coil packs, and ignitors only to spend more on COPS.


Let's establish that I am very dumb, even fatter, and extraordinarily lazy. I read the whole COPS thread, and am now having difficulty tying my shoes. I may try to build it myself, but I'd rather wait on a bitch dropping it pnp on my stoop.

[gospeed81]

I'm not sure if you already got a setup from someone...but I did mine Tuesday and it was EASY.

Made a huge difference as well. No more misfires, and smooth as a baby's butt all the way up to 7300rpm (whoops, didn't have resistor for tach yet, but datalog says I got carried away). COPS will make your day when you do it. I would have done it MUCH sooner knowing what I know now. Same can be said for straight-thru exhaust.

I upgraded exhaust on Thursday and now am feeling a LOT faster after what I consider a productive week. I lowered AFRs at the big end down to 12.0, and still am not maxing out the injectors. I just checked my last datalog, and at 6800rpm I'm seeing 67% duty cycle.

I know the 2560 is a bigger turbo...but you are probably still dumping in too much fuel. With your turbo characteristics and that timing map you really have no need to be running that rich. I would have stayed between 12.5 and 12.2 but my tiny turbo induces a little knock around peak torque range at 12psi. Once I add water injection I'll go back to my old VE table (leaner).