racecar

My LS6 motor seems to be lacking below 4000 rpm, not just from the cam, but it just does not respond. If it had a carb I would say it needs a new accelerator pump. No throttle response. Is there any table in HPTuners that
coorelates fuel with TPS? When I stomp the gas, it just seems flat like it wants more fuel. Feels like a huge vacuum leak. Is there a way to give it more fuel relative to TPS.
Once it gets to 4000 at WOT it runs good.

RedHardSupra

iTrader: (1)

try enabling PE earlier (there's a PE triggers writup on my site called 'boost perspective'). if you have a <4000rpm hesitation tho, it's probably a combo of wrong fueling (VE) and spark. get these done first or the rest is going to be moot.

racecar

The PE enables at 100%. I may set that down to 80-90 and try it. The main issue that I have is just no throttle response at cruising speed. I have to push too far on the gas to get the car to make a noticable move, it's just sluggish. If I push the clutch in and rev it, there is a lag, like a turbo. I was hoping to find a way to increase the fuel in relation to TPS, so when I rev, it will respond. This will make it easier to heel and toe downshift also.

SSpdDmon

iTrader: (10)

Wow, is that normal? My PE kicks in as low as 25% in the upper RPM's, but no higher than 55% IIRC in the lower RPM's. I made it slightly more aggressive than stock by reducing the entire table by 10%. Any chance you can post your timing table as well (in Excel if possible)? I'd be curious to see where your timing is at...but, I don't have HPT.

RedHardSupra

iTrader: (1)

yea, if you have a big cam that should have a lot of tq anywhere (comparing to stock), then enable it at like 25% everywhere. if your VE is right, it should get better (or at least safer!)

foff667

iTrader: (2)

I remember him doing it that way previously to try and win a gas mileage race or something.

brad8266

iTrader: (23)

I thought that was rather peculiar

SSpdDmon

iTrader: (10)

FYI...My PE enable is as follows:
400~3200RPMs: 55%
3600RPMs: 50%
4000RPMs: 45%
4400RPMs~7200RPMs: 25%

racecar

OK, I see that PE vs RPM chart, and mine is set to 19 above 3200, and 23 from 1600 to 2400. That's the kind of thing that I am looking for, I will try to lower that and see if it helps. I will try to attach the spark table. It's flat 25 after mid rpm because this motor knocks (11.5:1) on the race track with anything over 25, so why use more anywhere? That PE change may help me out when I rev to downshift. Right now I have to come down two gears and try to synchronize because I can't get it to rev fast enough.
The other problem is when I am cruising at approx 15% throttle and I give it another 5%, it hardly changes. I'm thinking this motor should let you know it's got something at any throttle increase, but it's sleeping.
Thanks for the help Gas mileage race, never heard of it

racecar

Oh, It looks like my PE is allready down there. Must have allready tried that.
This car comes alive at 4000, and that is where the Dynamic Airflow High RPM disable is set to. It appears to run better on the MAF, and not good below 4000 on the VE. Maybe I should work on the VE again. When I am cruising the wideband is good at 13.9, it's not that far off, throttle just does not have any punch.