0Terry@BMS

Hey guys,

In between projects I was able to sneak my personal Z06 on the dyno for a little tuning.

Car was on E30 with the rest 91 octane, using HP Tuners for tuning, and tuned it for both the stock intake and AFE intake. Overall was pretty easy to tune and I made several adjustments to the mapped timing decay (IAT, coolant temp) tables to keep it consistent from run to run. As well as the usual fan changes to hopefully improve actual cooling crawling through the staging lanes.

As expected with E30 it picked up more power with more timing. I settled on 2 degrees more than stock up top. It could probably take another 2 degrees more but since I am going to put a 2.3" upper pulley on it soon I'll just evaluate that more next time.

I wasted a lot of time fighting midrange timing retard that I was not able to solve. I verified its below MBT (torque does drop when lowing timing there) but it pulls 4-6 degrees in the midrange via knock retard for no obvious reason. I ended up leaving that part of the timing table stock for now. I tried various minor changes to the knock tables with minimal impact. Short of getting really aggressive on KR dampening not sure how to tackle that problem.

Best run today vs. best run when the car was stock (on ~93 octane). Stock it would drop 10-15whp run after run from the IAT decay and I'm thrilled that is no longer an issue now.



Best run today vs. best run when the car was running stock tuning with the AFE intake and E20. I spent a lot of time today testing out different air/fuel ratios and advance curves and while it definitely makes more torque up in to the 13s on E85 mixtures timing was a little less stable. So settled on around 12.9:1 in the midrange, 12.5:1 up top.



When I was done tuning I decided to throw the stock intake on and retune the same AFR and timing curve for an apples to apples comparison. I found the AFE intake to be worth around ~15whp over the stock intake/filter when everything is matched up. It lets the supercharger produce maybe 1/2psi more boost at higher RPM. I did a couple runs with a K&N filter in place of the stock and it was basically the same as the stock filter. I'm working on a new style of replacement filter for the hell of it that I'll test next time.







Also for those interested the HP Tuners file. I have a ton of logfiles but didn't really feel like formatting them for the thread. Sorry.

HPT

Great stuff, Terry. Can't wait to see more as you dive deeper into this platform.

Bob U

Great info.

WS6JJP

Terry, what percentage blend of e85 do you think a stock fuel system can safely handle running increased boost (3-4lbs more, let's say) before running lean?

0Terry@BMS

It's not really about running lean -- it's about maintaining high fuel pressure at a safe level for injection. Like, over 1000psi. The actual AFR is just a function of what you ask for in the tuning presuming high fuel pressure is maintained. And that is dependent on the high pressure pump capacity and low pressure being maintained.

I have not seen any high fuel pressure drops at this meager power level on the E30. Gut feeling is 650whp on E50 would be OK. I've noticed a few shops make low pressure upgrades so its possible the low pressure side will become the first limitation. I'll let you know what I find soon as I plan to test higher E85 mixtures when I up the boost.

I'm sure other tuners who have tested straight E85 at 700whp+ already know where the limitations are but I've noticed a general lack of communications on the forums. Even finding HP Tuner files that are unlocked is difficult. I guess it's a competitive market.

C7/Z06 Man

This looks like some "Real Deal" stuff here.

I have the AFE (-1) and my track results as far as actual ET/MPH compared to stock with all things being equal "so to speak" seem to agree with your results of approx. a 15 HP difference.

From your pic it looks like your running the "low flow" gray filter which has worked the best for me so far.

427Z0SX

Awesome! I remember you from the SCFB of the early 90s. Are you doing this for fun, or do you have a tuning business?
Thanks,

jbsblownc5

GREAT stuff Terry!!

I'll have to come out and see you sooner then later...

0Terry@BMS

Haha yes, same Terry Burger. In 2008 I started a company selling BMW tuning systems I designed and I've been doing that ever since. The Z06 is just a personal toy for fun. No plans to get back in to GM tuning other than helping friends, arguing on the forums, etc. I sold my C5s in 2005 when my wife got pregnant and I've been wanting another Vette ever since. The close out deals on 2016s were just too much for me to pass up. Plus, it makes a good race comparison car for all of our BMW tuning marketing.

0Terry@BMS

Come out and race 12/3 at Famoso, should be great weather! I hope to have time to install a 2.3" pulley by then. On your tuning with the Torco I bet we can bump timing up a couple degrees also and pickup 15-20whp. You do a lot of road racing though so may not want to get as aggressive on the IAT and ECT retard values as I've done. They might actually make it less consistent for you if you wind up getting legitimate knock based timing pull.

jbsblownc5

I'll do my best to make it, but I think you and might have to see what she does on your Dyno first...

C7/Z06 Man

Let us know how that new filter works out.

0Terry@BMS

Haha load some credits on your HP Tuners cable and I can help you sort it out.

jbsblownc5

Sounds like a plan Sir!

ajrothm

Thanks Terry for your R&D work and open/honest reporting on this. As you mentioned, everyone is tight lipped with tuning info on this platform so it's nice to see people willing to help the "do it yourselfers"...or at least us "dabblers"...

Kind of surprised the AFE only gained 15hp but, that's as real world tested and verified as you can get. I'd love to see a Haltech tested using your same procedure...it may shock a lot of people.

427Z0SX

That's a beauty!
Is there a website for your Bimmer tuning business?

CFHay

Whaaa.. I thought they were good for 8mph in the 1/8th?

0Terry@BMS

jbsblown has a Haltech on his so we'll do a similar test later when I help him with his tuning. I'm curious also. Based on my initial analysis though the result should be the same. Where the Haltech might shine is with a more stock like MAF scaling since it's more of a round tube/filter. So that would make tuning easier. But we'll see.

0Terry@BMS

We're maybe the 2nd or 3rd most well known BMW tuning company. So its probably not hard to find our website. But forum rules dictate I can't discuss business here.

Speedforhire

This^^^^^...........I won't be though. I'm not convinced in the Stinger hype and I welcome anyone to make a fool of me. I find it odd the manufacture himself doesn't even test their own product.

Thanks TB for your efforts.