rolly1818

thanks again. i am not discrediting you guys in anyway. some ppl are weird with their stuff, hope u understand!

i am on sumitomo HTR tires 245/45/17 - 12psi?? seems really low!

i will try the 2 step @ 6500 seems real high though, hope my t-case holds

i am on the stock clutch

Indy Evo

iTrader: (41)

I checked an old log where I ran a 12.50. It built 14 psi on the two step, but that was with the BFG DR's. The 60' was 1.71 while still on the stock clutch. 6500 on the two step seems a bit high for those tires, but thats where conditions and variables come in to play.

rolly1818

14 psi? wow. i am building 10. what were your timing values and AFRs at that point?

9sec9

iTrader: (2)

Stock turbo see's a slight benefit at 10 degrees of timing in the 140-160 loadcells. As boost goes higher, you begin to 'chase' the loadcells. Also, remember as the 2 step changes, changes need to be made to the timing tables as well. At 9 degrees, two step picks up quicker boost. At 8 degrees, on Jim's car, be ready to launch quick. We've seen up to 23-25 psi on launch, in less than 2 seconds. I've had to vary Indy's timing, based on the type of track event. If it's being tested at the local bracket races, I set it at 8 or 9. If it's true TnT, usually 9. BE VERY CAREFUL if you change your timing maps. BOOOM could be you're response if you're not paying attention or if you don't know what you're doing. I add a few clicks of fuel at the same load/rpm cells and if I'm running 8 degrees, I try to do 'lower number/blending in adjacent cells. Monitor the top of each gear load cells from 6500 up vs the launch load cells as they can get very close to each other at the very top of the gears if you're a 'stocker'. 220'ish at 7200-7500.

rolly1818

ur timing is 9? dont u mean negative 9???

and what are ur AFRs?

9sec9

iTrader: (2)

No, 9. As in positive. I use this part of the tune as an aid to the launch, not antilag. I'll look for some logs of the 'high' boost situation and maybe our 'normal' boost for comparisons. As for the AFR's, I add .2 to the 'rich' side in the 2step loadcells. Between the shifts, I'll use AFR's in the high 10's.

Looking at the timing tables, if you were to look at most timing maps, you'll find anywhere from 14-20 degrees in the 140-160 loads. Every tuner could be different. In our load cells, the 8-10 degrees is all it takes to change boost quickly. I'll try to find the logs and post them.

rolly1818

will be looking forward to it, i will post up one of my maps to show the areas i am speaking about and what seems to work for me.

Domolution

iTrader: (74)

Good job!

9sec9

iTrader: (2)

Not that this is not an exact science, but identifying trends is important, at least it has been for me and my learning curve of tuning the Evo. The following pics are representative of what I've found to be true in GENERAL. The timing I've used on the 2 step has been varied, based on immediate results at the track. These examples represent a GENERIC standard style timing map, a 14 degree 2 step timing, 12 degree 2step and finally, a 10 degree map. These are by no means the results anyone else may see. Mivec, fuel, wastegate setting, mbc, and on and on..... will change the results. This is what we see, based on our other settings. It DOES however show in a general way of how simple timing changes can and probably will affect your launch boost. Of critical importance is noticing the "LOG TIMES" for elapsed time from off throttle to 100% and the noted boost level. Generally we've seen .5 seconds quicker boost to same level when timing is lowered by 2 degrees. At 10 degrees, this example occurs in only .8 seconds to 16 psi!! On one occassion, we logged 26 lbs of boost in 1.2 seconds!! The first shows how "LAZY" the boost is using street type timing of 12-18 degrees. RPM level, blending of timing numbers, how many cells are used all
will have an affect on boost and time required to reach that boost.
First, the General street type map.


Now, the 14 degree setting:


12 Degrees:



And finally, 10 degrees. You can easily see the affect that 8 or 9 degrees could have! LESS than 1 second (.8) and 16 psi.


All of these examples are 0 speed (launch) and taking into account the lag of vehicle speed sensor being read and logged. Therefore, I used only absolute 0 vehicle speed by checking the RPM and loads as a guide.

The above results are actual results and logs, so the results are the results. How and why they got there is the only thing that would be up for arguement.

rolly1818

interesting stuff, from what i read its negative timing (-10) and rich AFRs (9-10 AFR) from 100 to 160 load around the respective rpm.

i will test on thursday when i have access to my car.

just realised my WGA is on 10 psi! no wonder i could not get more

9sec9

iTrader: (2)

Sounds like you're after anti-lag. For us, .8 seconds to 16 psi is enough for 2 step and the lowered timing on shifts 'keeps the loads up' on average. Good luck and let us know your results.

rolly1818

i am JDM yo, i got OEM anti-lag

currently i hit 160 load on 2 step, map looks funny with a sea of -10s though! that together with reduced timing to eliminate shift knock my map looks all chopped up

i will need to change my boost controller settings for more than 10 psi and i will see what i build @ 5500rpm.

rolly1818

i am JDM yo, i got OEM anti-lag

currently i hit 160 load on 2 step, map looks funny with a sea of -10s though! that together with reduced timing to eliminate shift knock my map looks all chopped up

i will need to change my boost controller settings for more than 10 psi and i will see what i build @ 5500rpm.

9sec9

iTrader: (2)

The above pics show the 2byte loads easily hitting 200+ at positive 12 degrees, and 180-199 with positive 14. Is this on a stock turbo? I've seen the T67 take the lowered timing with less boost produced, but the stocker seems to respond quicker and be less tolerant of less than 8. As a matter of fact, 8 is my limit on the stock turbo. In bracket racing, the quick boost enables you to nearly instantly go 100% tps, make boost and release clutch at nearly the same time. The boost will still be in the 'teens. If you're on it for more than a second, the boost will hit mid 20's and will continue up immediately! Got any logs of your 2 step?

rolly1818

no car right now, i will do some testing @ different timing values and post on a different thread on Friday.

BTW what are your AFRs during 2 step?