Air Filter for Turbo?
Didn't even get to 90% throttle until 2.5 sec into the run (no traction) and then it stayed at 90% the rest of the run 
03-26-2018, 08:20 AM
#142
Depending on th pid you are using for tps it is possible you were wot but it reads duty cycle so it only says 90 percent. Its like that if i pick the wrong pid on my car. Not saying you did that just that i have in the past and it is something to check.
03-26-2018, 09:19 AM
#143
I went out to the car and logged the PID with the car off and the gas pedal pressed....sure enough only 80-90%. Shoved my foot through the floor and saw 100%....looks like I need to adjust the cable/pedal. Kinda sucks cause we were -250ft DA and if I could have gotten out of the hole and had 100% I think it would have went significantly faster.
03-26-2018, 09:29 AM
#144
Gotta slow down the initial power “spike” when boost comes in. Plenty of traction out there if you dial that in. Make a quick pull at WOT logging and note right where the tires spin. Soften the timing map a ton in that region. Boost by speed and ramping in timing from a trans brake release (or foot brake release, whatever) over time work really well too.
03-26-2018, 09:55 AM
#145
Gotta slow down the initial power “spike” when boost comes in. Plenty of traction out there if you dial that in. Make a quick pull at WOT logging and note right where the tires spin. Soften the timing map a ton in that region. Boost by speed and ramping in timing from a trans brake release (or foot brake release, whatever) over time work really well too.
To be fair, I did up the boost ~2 psi, swapped to an LS7 MAF in a 4" tube, changed the fuel pump, and a couple other little things so I was hoping to make more power (and confirmed), but didn't think it would impact the launch. Track temps didn't help the case as it was ~50* air temp on the last pass.
I hear you on softening timing at the hit, need to work on that. Have you seen anyone do timing retard by speed on a stock PCM or thats left to the aftermarket?
On the plus side, looks like ~84% DC on 60# injectors @70psi should mean its making decent power. Go 4L60E!
03-26-2018, 10:20 AM
#146
I’m only familiar with aftermarket methods. But I’d think you could soften the initial onset of boost by dropping timing way down as boost builds up to your set point.
Assuming you build boost really fast and 15lbs was the goal… Try running like 8* of timing from 1lb to 13lbs, then ramp timing back in from 13 to 15lbs… I haven’t tried it before, I’m sure it would need some tweaking. Let us know how it goes.
Assuming you build boost really fast and 15lbs was the goal… Try running like 8* of timing from 1lb to 13lbs, then ramp timing back in from 13 to 15lbs… I haven’t tried it before, I’m sure it would need some tweaking. Let us know how it goes.
03-26-2018, 10:36 AM
#147
I’m only familiar with aftermarket methods. But I’d think you could soften the initial onset of boost by dropping timing way down as boost builds up to your set point.
Assuming you build boost really fast and 15lbs was the goal… Try running like 8* of timing from 1lb to 13lbs, then ramp timing back in from 13 to 15lbs… I haven’t tried it before, I’m sure it would need some tweaking. Let us know how it goes.
Assuming you build boost really fast and 15lbs was the goal… Try running like 8* of timing from 1lb to 13lbs, then ramp timing back in from 13 to 15lbs… I haven’t tried it before, I’m sure it would need some tweaking. Let us know how it goes.
03-26-2018, 02:32 PM
#149
Yes pump gas, stock PCM. I have the MAF scaled to ~60% of the original, so I've got columns to play with on launch, and then once it gets into real boost/rpm then I jump to the final column in the spark table.
Last edited by ddnspider; 03-26-2018 at 06:36 PM.
03-26-2018, 06:35 PM
#151
With a 2 bar OS you could, but yeah otherwise you're strictly looking at the 105kpa vs rpm column of the VE table. While the MAF transfer function can't "see" boost, it can see airflow at a given boost when it's scaled. This keeps you from the dredded PE raping as some people call it.
03-26-2018, 10:39 PM
#157
And exactly what intake path and filter were they using ?
And how does it not compute ?
No filter or anything on the turbo could be quite a turbulent area to draw air from. Running some pipe, or better still pipe to a bellmouth would be a smoother flow path and undoubtedly be better.
If the filter is of adequate size to not restrict...which shouldnt be too difficult then again...there should be no downside, and a filter again can help to smooth airflow.
It would take a pretty nasty filter or massively undersized to pose a big enough restriction to really affect power. And lets face it, many run a crude screen or mesh directly over the turbo, which is probably by far the worst of all options
And how does it not compute ?
No filter or anything on the turbo could be quite a turbulent area to draw air from. Running some pipe, or better still pipe to a bellmouth would be a smoother flow path and undoubtedly be better.
If the filter is of adequate size to not restrict...which shouldnt be too difficult then again...there should be no downside, and a filter again can help to smooth airflow.
It would take a pretty nasty filter or massively undersized to pose a big enough restriction to really affect power. And lets face it, many run a crude screen or mesh directly over the turbo, which is probably by far the worst of all options
I have done this back to back on the dyno.
03-31-2018, 10:37 PM
#159
AIR FILTER FOR TURBO: Im really happy how mine came out, just finally got it made up after almost a year of using an ugly silicone bend. A/F got half a full point leaner. I was worried it wasn't going to fit in there but I guess I underestimated what a plasma cutter can do in 5 seconds for a hot rod.
If you look on right side you can see the tab for the pcv
4" AFE Dry filter, and on the far left side a factory hole (slightly enlarged) the leads to air from under the fender.
for more pics/info PM me as I am keeping it stealth in all aspects
If you look on right side you can see the tab for the pcv
4" AFE Dry filter, and on the far left side a factory hole (slightly enlarged) the leads to air from under the fender.
for more pics/info PM me as I am keeping it stealth in all aspects
