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Did it ever do that on the dyno or any other time? If you accelerate without launching does it still happen? If the computer losses communication or has an unclear reading it will go into that mode. Pain in the @ss I know. I was having issues where car would randomly act up at cruise and go into reduced engine power. I changed throttle position sensor and that fixed it but it doesn't sound like your issue.
No issues on the dyno. It spiked to 24 psi on the last dyno pulls and no problem. Those pulls were from 2500 to 6500 with full boost before 4000 rpm. Right now it only happens on a hard launch at the track with throttle applied very quickly and maximum traction. I think I've had it happen once on the street a few months ago. I was in 2nd or 3rd with lots of tire spin and had to get on and off the throttle repeatedly. This caused it to go into REP.
Good info. I think the tables are basically the same whether using efi live or hptuners. It sure would be nice to know which ones were changed and where the values are set.
Did he mention why it is still going to do it above 21 psi?
I was always told the efi had more detail tables in it for better like tuning. But HP tuners had same tables but the hp tables stuff was easy to work in & faster to do. But I couldn't tune a fart on one are the other. But was told by 3 diff tuners that was the reason they went to HP tuners.. Robert
I had a similar problem with my car. It ended being the throttle body electrical connector would get slightly loose. I basically unplugged it and plugged it back in and the problem went away.
It was a simple problem but did'nt figure it out untill after I bought a new ls2 throttle body and the problem happened again.
I had this problem and went through every table for throttle and map,Its been along time since i had any trouble but you can check these tables,This is from EFILive though, Table C3004 predicted map min.table,C3003 predicted MAP max I have maxed out,# C3906 TPS vs RPM Test upper,C3907 TPS vs RPM test Lower,
An example of that can be seen in the screen shot below. Just compare Throttle Position (SAE) and ETC position in that particular moment...
The screen shot is a good capture. I log tps now and will add etc for the next track visit. Unfortunately the track rained out Sat, Sun, and Tuesday. I'm in Utah skiing till next week so I'll have to wait until the weekend of the 18th to test.
What is going on with the car that you posted? Have you figured out what is causing the discrepancy and a remedy?
Last edited by Turbo-Geist; 03-11-2017 at 12:20 AM.
What is going on with the car that you posted? Have you figured out what is causing the discrepancy and a remedy?
A weak TB motor. It's been well-known with NW102 for years for high hp builds.
I don't know the current situation, as there may have been some improvements with the design.
Since your issue is with stock (GM ETC) TB, you might not be able to fix your problem with tuning. A cable TB, pedal, cable itself and IAC motor + some wiring and tune changes would be needed.
However, please VERIFY first what's going on by logging with HP Tuners.
So with this thought of the TB motor being the issue I assume it is being forced into a position due to boost pressure that the PCM request signal doesn't jive with? One would guess that the bigger the TB the worse the problem also.
So with this thought of the TB motor being the issue I assume it is being forced into a position due to boost pressure that the PCM request signal doesn't jive with? One would guess that the bigger the TB the worse the problem also.
I have a NW 102mm TB,No problems,But I'm only at 10 lbs of boost.I did have problems at first awhile back,The blade at WOT wanted to go past the horizontal/WOT position so I drilled a hole and tapped for a bolt/set screw to stop the blade from trying to flip past the WOT point and it must flip out the TPS sensor lol,Never had a problem after that.If your looking at the throttle opening,Its about at the 4o'clock position.
03-08-2017, 05:42 PM
