I have a new BR 2.3L stroker with 10:1 compression that I am currently tuning on E85. I am still on the stock turbo and MAF for now. I have S2 cams, 3.8" intercooler, etc. see my sig. for the rest.

I was comfortable tuning the stock block on 91 oct plus meth, but this is a new animal for me. I don't have much experience with strokers, higher compression, or E85. E85 scares me a little, I don't want to go past MBT.

I want to run 30 psi boost... that's no problem for 10:1 on E85 is it?

I am thinking I should be able to run about 0-2* at peak boost then ramp up to 14-16* by 8000 rpm. Does that sound right???

Here is my current ignition map. I tried to make it conservative for a starting point. I did my best to trace how I run through it currently. Does it look safe and far enough from MBT to be a good starting point at 30psi?



EDIT: more pics added



Thanks!

 

No pic!

 

Sorry, pic fixed... and i added 2 more.

 

What kind of turbo do you have? 400 peak load as the graph goes, sounds higher than 30psi!

 

Ya, it does seem high from what i've seen from others... I am on stock IX turbo

 

Load factor ?

 

My 2 byte to 1 byte load factor = 1.7

1.7 * 255 = 433

 

Why not the normal 1.2? Which would produce a more realistic load figure.

 

If your load factor is set below the amount of load that your ECU is seeing, then your load values will get clipped at a certain level in your logs. With a factor of 1.2, the max load you can log is 306. If your load is higher than 306 you won't be able to see it in your logs. The load factor doesn't change the amount of load you have. Load is based on each setup and things like engine displacement and boost. Intake pipes and air filters affect the MAF sensor reading and influence load values. Also, boost leaks will make your load values higher than they should be too.
Speaking of which, I want to do another boost leak test again this weekend.

 

Needs more timing and more fuel out the top end, midrange needs more fuel too

 

Thanks. I am just starting so it needs work, but could you be a little more specific please?

I was thinking to run 12.5-12.8 on spoolup, then 12.0, and 11.8 at the top?

So you think my spoolup and peak boost timing looks about right? I know I need more up top but not sure how much? Does 14-16* sound about right?
I've heard that strokers take less timing and higher compression takes less timing too. I know if I was on the stock block I would be somewhere around 17-19* out top, but not sure for this setup?

seems kinda hard to find MBT on the street with virtual dyno with confidence...

 

Sure, I know that, but my point is that your load figure should be around 300 @30psi/stock turbo, a much higher figure would indicate to a boost leak as you mentioned. I never had to change load factor on a stock turbo. I once hand to increase it to 1.3 on a 20g sized turbo.

 

Stroker blows that load factor out of the park though.

Aim for 1* at peak boost, 10* at 5000 and steadily ramp that up to ~18* by 7k.
By then you'll be only running 22-23psi max anyhow.

 

I forgot that he mentioned the 2.3L you're absolutely right.

 

Thanks Benja. wow, 10* at 5000 rpm, that sounds like a lot! I'll try to get there, one degree at a time. I think I'm at like 3* at 5k right now. I'm only able to hold 20-21psi at redline....i need a bigger turbo! I'm accepting donations