First time at Bandi in 2 years

[DSMtuned]

Whelp I took the 1g to Bandi last night. I'm obviously not going to put this in the "bragging rights" section, but I felt OK about my runs. There were tons of cars at the track and it had to be worked over a few times after cars spewed fluids all over. This is how it went down:

Full street trim, 91 octane, conservative tune, snow tires, Scott D. as my co-pilot: 13.3@103, 1.8 60ft. Not bad I guess. I have some tuning to do and I of course need to put some race gas in there. The Evo3 16g was at 24psi.


Major Mods: Evo3 16g, FMIC, 660s, custom EPROM chip, SAFC, 2g mas, WI running 70% Methanol, Jack build tranny.

[XakEp]

Congrats!

[BlueVelocity]

Nicely done man. Sometimes the ballast of another person helps.

[matthewdesigns]

Nice run! And you cut a 1.8 in a FWD? Sheesh I need some practice lol.

[DSMtuned]

Nice run! And you cut a 1.8 in a FWD? Sheesh I need some practice lol.

Thanks guys! Nah it's an AWD. This was with snow tires at 32psi and in the groove.

The track was super slick. The rear wheel drive guys were taking off sideways much of the time.

[Wazzelby]

Congrats, I'm gonna go up next week for the first time in a couple of years.. Car feels pretty good at 30 PSI. We'll see how she holds up.

[DSMtuned]

Congrats, I'm gonna go up next week for the first time in a couple of years.. Car feels pretty good at 30 PSI. We'll see how she holds up.


Sweet! Well good luck!


So one problem my car has always had (and it did last night) is that it will start to knock in between shifts. I'm not sure if it is "real" knock or "phantom." The problem is that the knocking continues into the next gear and slowly decreases. But the point is, it's stealing valuable timing.

The knock seems to be unrelated to A/F mixture, throttle position, etc. Any ideas? Should I increase or decrease the SAFC low throttle setting for the associated RPM range seen during shifts?

-Craig

[Wazzelby]

Have you checked your knock sensor to make sure it's in good shape and tightened to spec?
Strangely enough I'm having the opposite problem, running E-85 at 30 PSI and getting AFR's in the 14.0 range with absolutely no knock..

[matthewdesigns]

Allen, I have had my car into the 16's:1 on e85 by accident, and no knock. Multiple times, so I know it wasn't a fluke. Don't ask :P

[Wazzelby]

I'd like to get it sorted out to the low 13's before I push it at the track next week. I'm wondering if I'm running out of pump and/or injector.. 1000cc's and a single Walbro 255. Maybe I should throw in another 255 inline..

[matthewdesigns]

Here's a helpful thread (http://www.dsmtuners.com/forums/articles-tuning-ecu/253452-e85-injector-max-lb-min-calculations.html) with e85 injector and pump flow numbers. They are generalized of course, but it might help you know if you are approaching the flow limit for either of them.

[thiazole]

Yeah, back in the day (2006?) when I first converted to E85, I screwed up on my global calculations and was going lean enough to misfire, but never saw any knock.

[TerryLiv]

Sweet! Well good luck!


So one problem my car has always had (and it did last night) is that it will start to knock in between shifts. I'm not sure if it is "real" knock or "phantom." The problem is that the knocking continues into the next gear and slowly decreases. But the point is, it's stealing valuable timing.

The knock seems to be unrelated to A/F mixture, throttle position, etc. Any ideas? Should I increase or decrease the SAFC low throttle setting for the associated RPM range seen during shifts?

-Craig

Craig,

I resolved this problem about 5 years ago when I was running race gas. It was with the help of my friends, and was a code change to pull timing when the clutch was in and using no lift during shift. Erik A. and Carl Morris helped modify my KeyDiver chip. Made a fantastic difference by eliminating knock during stutterbox starts and during shifts.

Keydiver should be able to add this to his chips if he doesn't already have it.

Terry

[matthewdesigns]

But, what is the actual cause of the knock? What about a simple shifting of gears creates knock? Is it the brief bounce off the rev limiter using NLTS?

[DSMtuned]

Craig,

I resolved this problem about 5 years ago when I was running race gas. It was with the help of my friends, and was a code change to pull timing when the clutch was in and using no lift during shift. Erik A. and Carl Morris helped modify my KeyDiver chip. Made a fantastic difference by eliminating knock during stutterbox starts and during shifts.

Keydiver should be able to add this to his chips if he doesn't already have it.

Terry

Hey Terry,

Good to hear from ya!

I was using a stutterbox and NLTS (when I remembered). Erik is actually the one burning chips for me, so I would assume that those features have the code that you're talking about. Maybe there is still too much timing during shifts. I'll have to look.

-Craig

[yokotabrat]

Craig,

It's actually separate code from the standard NLTS and stutterbox code so it might not be there. I also did this code change on my car and was able to get rid of knock during shifts.

[DSMtuned]

Craig,

It's actually separate code from the standard NLTS and stutterbox code so it might not be there. I also did this code change on my car and was able to get rid of knock during shifts.

Sweet! Well I'll have to talk to Erik. I have still yet to get an Ostrich for TunerPro, but maybe someday after I stop pouring money into the house...

Thanks,
-Craig

[Kibo]

Ah, now I understand what you were talking about, Craig. Bert is right, Carl's code is not in the chip I burned for you. We can surely modify your chip, though.

[DSMtuned]

Ah, now I understand what you were talking about, Craig. Bert is right, Carl's code is not in the chip I burned for you. We can surely modify your chip, though.

Sweetness! That would mean absolutely no knock on 24psi and pump gas!

-Craig

[Redline89]

nice!

[TerryLiv]

Sweetness! That would mean absolutely no knock on 24psi and pump gas!

-Craig

Craig,

This mod will not keep it from knocking when the clutch pedal is disengaged, (up).

Terry

[DSMtuned]

Craig,

This mod will not keep it from knocking when the clutch pedal is disengaged, (up).

Terry

Yeah I know. I don't actually have any knock at 24psi on 91 octane gas when tuning in a single gear. It is only at the track using NLTS and it originates between gears.

So I'm just saying that this mod should eliminate knock from my current tune.

-Craig

[TerryLiv]

Yeah I know. I don't actually have any knock at 24psi on 91 octane gas when tuning in a single gear. It is only at the track using NLTS and it originates between gears.

So I'm just saying that this mod should eliminate knock from my current tune.

-Craig


On E-85 I have no knock, but when cleaning my injectors (running 91 octane) I get plenty when I am not careful and the boost reaches about 24 psi. And that is with 10 less degrees of timing than when on E-85.

Terry

[DSMtuned]

On E-85 I have no knock, but when cleaning my injectors (running 91 octane) I get plenty when I am not careful and the boost reaches about 24 psi. And that is with 10 less degrees of timing than when on E-85.

Terry

I've never tried E-85, but the water injection does wonders. I usually run a 50/50 mix of methanol and distilled water. I have two staged nozzles that trigger at 12psi and then at around 18psi. IIRC, I am injecting at about 10% of the amount of fuel I'm putting in.

The best mods I've done were the EPROM with the chip running the extended timing and fuel maps and the WI.

I've always been amazed that I have no knock at 24psi on 91 octane, but that's what works with my set-up. My WBO2 is about 11.7:1 at WOT (of course that's slightly off due to the addition of methanol).

-Craig

[JayRolla]

I would look into e85. Its very amazing. I run my 16g at 32psi falling to about 26psi at 6000rpms where I shift. Timing is stock 1g timing advanced down low and I never see any knock. I have ran up too 26* timing advance with no knock but the power gained was minimal. I run 11.5 afr's.

I need to get it to the track. My goal is to break 12.5 how it sits now and I know I can due to some cars I have played with. To be crazy I really want her to break into the 11's but its so hard up here with such a small turbo. My hx40 will change that.