My tuner is having problems getting my NW TB dialed in. He has ZERO experience with the Nick Williams throttle body. This is on my modded LS7 powered Z06. The car made great numbers on the dyno but is suffering with drivability problems. The idle is hunting bad and the RPMs hang a bit in all gears, including returning to idle. I talked in depth about this with Jim Hall, who has NW TB tuning experience. He gave me some ideas. I'd really like to get some pointers from the master though...

Any help and a tech assist would be greatly appreciated!!

FYI... I've tried unsuccessfully to get in contact Nick, on several fronts.

Here's the dyno run;

 

A dyno sheet is not going to help much, when correcting idle and decel issues.
Post the tune file and some logs....

 

Big TB's can test your tuner's ability! Which software are you using?

When I purchased my 102 it was very difficult to get a hold of Nick, when I finally did he modified a few tables to get me going. In the end it really didn't help much so I wouldn't worry about any help from him.

 

Thus far, I don't have access to the files. As I recall there was a thread (can't find it now) discussing what specific modifications to certain air flow tables that had to be made up front with the NW TB.

My tuner's using HP Tuners.

He intuitively went more on the idle air. I've now heard he should have went with less and that explains the current hunting idle. There was also some percentage "reduction" of one of the air flow tables.

 

Did you get help?
Want to keep that TB?
Drive to Heintz Racing in NC.
I paid dearly for this wisdom.

 

I got it tuned but still have drivability issues.

Too far to travel to Heintz. There's good tuners closer...

Thanks for the suggestion though!!!

As far as the Nick Williams TB. Their tech service sux. How can a company sell an item like this and provide ZERO support or concern??? You can't even get in touch with them.

 

this is not a Throttle body issue. his throttle bodies are flawless, this is a tuning issue.

This is like asking all TB manufacturers to be able to tune the thing when they simply manufacturer the part. That being said some do know how to also do this.

I remember this post also about scaling the values...I will do some digging to try and find it. I think Phil99vette or JimmyZ posted it if I remember right...maybe 48%.... its an area difference. Will do some digging

 

Thanks for your help ZL1!!

FWIW, I did some research myself and got the scaling values to my tuner. He had no experience with NW TBs. I talked at length with Jim Hall and he too provided some valuable assistance. I've still some drivablity issues that need sorting even after all that.

I understand tht Nick is only the MFR and not the tuner. IMHO, the MFR still needs to provide technical assistance WRT products he sells, especially when he is a "tuner" as well as the manufacturer. I never said his product(s) were inferior. What I resent is making a product and then disappearing into oblivian, leaving the customer high 'n dry. He's provided technical assistance in the past, to people that were able to get hold of him.

I'm a small business owner and I can tell you my company would die a quick death if I provided similar customer service, my "responsibility" or not...

 

There is a air calculation table that has to be changed. That fixes it all.

Don't have my tuning computer here to find exactly what table. sorry.

 

The TB business (and other parts machining) for vehicles is a side part that Nick kept doing as there was a decent demand for it, especially for parts that worked well. the real business is machine work for companies that pay the bills and keep the lights on and food on the table. This side of his business took off and had huge demand, so this is what took priority.

If you find that table, I will ask that it gets copied or made into a sticky in the PCM Diagnostics page.

 

Subscribing...

 

what % is your TPS at in gear while coasting or in P/N ?

 

My tuner sent me the entire HP Tuners file. Is there someone I could mail it to to get their thoughts on it. I can also provide them a list of all the drivability issues that I am having.

I have no problem reimbusing them for their time and effort, FWIW.

Thanks!!!
Dave

 

There is a throttle effective area table that will need increasing for the larger throttle. loads of airflow modelling is based on that.
I dont use HPT so I cant tell you, but its a single value for mm2 throttle area IIRC.

 

i tune a ton of these setups on c6 z06's... send me the file and i will look at it... Ryne-cms@hotmail.com

 

Thanks Ryne, very much appreciated. Email on the way...
Dave

 

Any update on this?

 

I finally found a very competent local tuner. He's a one-stop-shop, cured all my woes.

The first local tuner couldn't get the drivability down pat, stalls and massive surging. The Katech Torquer 110 that I'm running is one of the milder LS7 cams out there too, not really a PITA to tune.

There was also a problem with stretched pins in my ADL connector. It was causing a loss of communications during the tune. The first tuner couldn't get that down pat either... The loss of comms during the tune hosed/locked my ECM too. After a tow, my dealer ended up replacing that after a failed attempt at revival.

There were several of the board's supporting tuners that helped and/or offered help too. My hat's off and many thanks to them for their time, efforts and kindness to a stranger.






The car made 557/540 SAE and has a terrific 110LSA lumpy 850 RPM idle.



BTW, not a peep from NW...