Going to a NW 102 soon

[oakley6575]

What kind of problems do you guys have when tuning for a 102 throttle body. I am going from a stock LS3 tb and intake to a FAST 102 and NW tb. Just wondering what I have in store for me.

[5_Liter_Eater]

Is it drive by wire or cable? Either way you are in for a hoot. From what I've seen they are not fun to tune for idle and off idle. Drivability will likely suffer.

[oakley6575]

Sorry I didn't mention but it's a DBW application. Is it worth the problems to upgrade to the 102 from the stock 90mm? I'm putting a fast 102 on for sure, but I'm still up in the air on upgrading throttle bodies. What are the advantages and disadvantages?

[5_Liter_Eater]

Personally I would say no but since you've got a FAST 102 I can see giving it a go. DBW may act better after adjusting the ETC scalar. I've just seen the IAC'ed versions act funny.

[oakley6575]

Oh I see. Anyone else out there who has tuned a DBW 102 tb?

[zippy performance]

What kind of car?

[oakley6575]

2003 RCSB Silverado
408 Iron Block
WCCH Stage II LS3 Heads/FAST 102
231/239 Cam
4L80e w/ Yank SST3200

[LSxpwrdZ]

Go with the 102mm TB. The car's I've noticed them as being a little awnry is usually stock small cube car's like 37x cubes and down. I had a good bit of trouble with a NW102 on my buddy Brian Tooley's 454 in his C5 as well but most of that was due to the slow and ignorant 97 PCM. Once we got him upgraded to a 99-02 PCM it was all good.

You'll have to play with the ETC scaler quite a bit to get the desired idle airflow within spec of the dynamic airflow (you don't have to get them to match but I usually try to so that it's a bit simpler to get the various idle airflow tables to work correctly).

[oakley6575]

Go with the 102mm TB. The car's I've noticed them as being a little awnry is usually stock small cube car's like 37x cubes and down. I had a good bit of trouble with a NW102 on my buddy Brian Tooley's 454 in his C5 as well but most of that was due to the slow and ignorant 97 PCM. Once we got him upgraded to a 99-02 PCM it was all good.

You'll have to play with the ETC scaler quite a bit to get the desired idle airflow within spec of the dynamic airflow (you don't have to get them to match but I usually try to so that it's a bit simpler to get the various idle airflow tables to work correctly).

Do you not use the etc scalar spreadsheet to find the correct number? I'm sure that is a stupid question, but can you explain to me what the correct way to alter the scalar is from there?

[5_Liter_Eater]

... on my buddy Brian Tooley's 454 in his C5

Name dropper. Brian speced out the cam for my soon to be TT 408 build. Great guy.

[LSxpwrdZ]

Yeah I think I heard him say something about that. We talk very regularly and he just lives 35mins from me haha. Very very knowledgeable guy for sure!

Oakley I do use the normal etc scaler that would be calculated but sometimes those numbers have to be fudged up or down to get desired results. Some TB's of the same size might flow different at XX% tps. This is why I try to dial the etc scaler in to make desired idle airflow match dynamic airflow.

Not to get the two confused but the idle desired airflow has nothing to do with airflow calculations for fueling. It is only for idle routines. What I have noticed though is if you get desired idle to match the dynamic airflow then the other idle airflow tables nearly fall in place, meaning if you add 1g/sec of airflow then technically it should also increase the physical airflow by similar amounts adding 1g/sec to the dynamic airflow as well.

[oakley6575]

Thanks for your help James. I will definitely go with the 102 when it comes time

[angrygoat]

This may be a silly question but here goes. It has been said numerous time that the most important setting is the ETC scalar setting for the 102 TB. Why is it labeled ETC and the info at the bottom for that setting in HPT even says only for vehicles fitted with ETC when the cable drive TBs obviously arent ETC?

[oakley6575]

If your running the cable driven 102, the ETC scalar isn't referenced. ETC = Electronic Throttle Control. So if your running a dbw 102, you have to change the scalar.