Smooth Throttle for UpRev

elperuano

Lol I can never get my RPMs under 2k!

Baer383

You must have a very high idle.

__________________
2013 ZL1

754 rwhp 747 rwtq

elperuano

Lol! It's right around 800-900 but a the touch of the gas in 1st gear with boost my rpms shoot up fast. Every shift after its over 2k.
I went with Jon @ Z1 so I'm guessing he smoothed it out.

Baer383

I used the 2300 throttle map and when I tuned my car I saw (while logging in ROM editor) where when you move the gas pedal from let's say decel to on the gas a very bad transition so I saw the 16 cells that were really lean fix that on now you can't tell when I'm on or off the gas.

__________________
2013 ZL1

754 rwhp 747 rwtq

elperuano

That's interesting, so it's like u constantly have accelerator pressed even when ur not pressing down on it? As far as lean spots go do you mean when off the gas coming up at a red light or stop sign?
I don't have any lean spots that I can tell when data logging or checkin my a/f gauge, but sometimes I get a weird reading when in boost from 2nd or 3rd with lots of wheel spin. Was actually wondering if its readin it right or wrong during wheel spin since I'm not actually gripping n maybe it might throw reading off for a second. Highway runs tho my a/f seems spot on around 11.2

Baer383

No I'm talking about as if you are at a stop sign and you take off the moment the gas pedal volts(idle is about .73) move between .73 and about 1.09 if you hold it there and watch the ROM editor I saw it was really lean this all happens quickly but never the less is would cause a abrupt transition from the idle circuit to on the gas causing a hesitation some people refer to this as tip in once I got the correction factors close the transition was very smooth hard to tell when I'm on the gas or not.

__________________
2013 ZL1

754 rwhp 747 rwtq

DIGItonium

For my situation it's not just flooring it, but just normally taking off in 1st the car ramps up slow regardless of throttle position and surges forward after 2k RPM. But yes, I do have to keep the RPMs above 2k to get out of that slump.

__________________

elperuano

I'm running os giken clutch so to take off I needa put a little more throttle to get going but by the time I'm off and running my rpms travel up pretty fast. Mine doesn't seem slow, and I can't give it full throttle cuz boost will already be creeping up and it's buncha wheelspin.

elperuano

Ahhh nice! Thanks for clearin that up. I'll look for that on my next datalogging.

wstar

Yeah the tip-in thing with lean fueling is definitely part of the problem on the stock setup. I somewhat remedied that on my car by going over to the A:F tables and making things a little over-rich in the low RPMs at low throttle. Upside is there's fuel available for that tip-in, downside is I get some occasional backfires when transitioning from engine braking back to neutral throttle at low RPMs and low throttle input (e.g. engine braking gently down to a stoplight and popping into neutral just as it's reaching the point where the engine would naturally start to lug out for being too low. If I don't time it just right, nice little fireball pops down the exhaust).

Are you saying you corrected your lean spots in that same A:F table, or elsewhere?

__________________
7AT Track Car!
Journal thread / Car setup details

Baer383

If you do like I did you won't have to backfire, I just drive and watch the correction factor and during live tuning while holding the pedal there while you feel it sputter add the fuel on the fuel comp table but don't go passed 100% leave it a little and I mean a little on the rich side maybe 95-97% and I don't backfire on decel from 7000k down to 800 idle.

__________________
2013 ZL1

754 rwhp 747 rwtq

juld0zer

Can i trouble you to post up a screenshot of your A:F tables please? (either current or the backfiring one). How bad was the backfire? I dont mind a little crackle and pop

Thankyou for your time and effort in researching and refining something for the community to use. Likewise for Baer.

I've got both maps loaded at the moment and although i tried to tell myself to like Baer's one more because it is an 'upgrade' over wstar's (by no means inferior) and it reduced some of the low rpm lag for him. On tip in it actually felt worse. For example, parking the car using my normal light taps of the gas pedal and feathering the clutch almost resulted in stalling. I am running an underdriven crank pulley so that might be a factor too. During normal driving, Baer's map for me was noticeably more jerky. I thought a map designed for 7AT would feel weird on a 6MT, and a map designed for 6MT would be better for my car.

One thing i would like to note is that SRM for me while using wstar's map works much better than it ever has on my car!! I always thought the SRM feature on my car was a bit off compared to the numerous test drives i had before buying this one. It works so well that i even get a smooth engine braking action when going down gears. With Baer's map, i got a lot of jerky shifts - mainly upshifts though. Downshifting was not much different from stock. I dont think it's a coincidence because when switch between maps on the fly, the effect is instantly noticeable.

Again, i'm not saying either map is superior/inferior. For my driving style and personal preferences, wstar's map is my choice. I didnt have a chance to test out both maps at higher rpm (4000+).

DIGItonium

Hmm that's pretty interesting. Good to know. I definitely need to get out of this canned tune O_o. We shall see if I still have this car within the next year or so.

Unrelated. I notice there are times I have issues starting the car, and it doesn't matter how hot it is outside. When it starts I smell a bit of fuel as if the engine was flooded.

__________________

Baer383

Starting the car to me has been the hardest part(tuning for 516rwhp was easy in comparison)
There really has to be a fine balance between not enough fuel to too much fuel.
Do you have test pipes?

__________________
2013 ZL1

754 rwhp 747 rwtq

DIGItonium

No test pipes. F.I. HFC and 12" TDX exhaust still. I remember reading about startup issues due to leaky injectors. [shrugs] It comes and goes. There were times I had this issue once or twice a day, then it goes away for several weeks.

Wow you're making nice power. I think 500 whp is my target as well with this new setup, but I care more about quicker and smoother response.

Over 23k miles (knock on wood). The car was with Baker Tuning for over 2 months, and I picked it up during Labor Day weekend last year. Sam says he wasn't given the datalogs so he could send the correct tune, so it was still running the canned tune. So I recorded my logs and sent it to him and heard no response from either Sam or Mike. I wonder if it's because of the MBC that they don't want to touch my car. At Baker, they were playing it safe at 6 PSI (no boost controller or wastegate tweaks) and this canned tune not knowing what my driving habits were.

Nearest tuner for me is in KC, which is 3 hours away. I wouldn't mind having Z1 tune it after the new upgrades. [sigh]

__________________