95mm throttle - impossible to tune on L83

[MoBoost]

2016 L83 5.3 Silverado
Stg2 cam, Whipple, LT4 pump and injectors
95mm Soler throttle body

Is it possible to tune this combo? I am hitting a wall! Can't make it idle how I want it, hangs throttle on decel.

There is no throttle body flow calibration like on Ford or Dodge.

Changing max throttle mm2 does nothing.

Pulling air to close throttle (via maf or VE) - bugs off the torque and fuel calculation.
Fooling torque tables makes AFR and timing go haywire.

Decel is possibly hardcoded to 26% - which makes this combo hang at 6300rpm.

Current tune attached. I have tuned same combo with stock throttle body and was done in 2 hours. I have been fighting with this for 2 days.

Please help.

[Joshinator99]

Ditch the Soler TB and return to a stock LT5 95mm. I know multiple other owners on Camaro6 forum (and myself included) who tried Soler ported TBs and they were a nightmare to tune. On the other hand, I’ve had a stock 95mm, a Katech 103mm, and now a Katech 112mm with no tuning issues at all.

[MoBoost]

Putting OEM LT4 throttle body fixed it.

I mean the 95mm technically worked - is there no way to model it?

[Alvin]

Unless you have a positive displacement blower like a LT4, Magnacharger, LSA etc.. Skip the throttle body. So much tuning headache and money for maybe 1-3 rwhp. I've done radical NA builds that literally pick up negligible power on the dyno.. Like can't tell the difference between two runs.

I think people feel the flow difference at lower throttle settings and think that it made a big difference where at 100% throttle it did nothing.

[Ben Charles]

Unless you have a positive displacement blower like a LT4, Magnacharger, LSA etc.. Skip the throttle body. So much tuning headache and money for maybe 1-3 rwhp. I've done radical NA builds that literally pick up negligible power on the dyno.. Like can't tell the difference between two runs.

I think people feel the flow difference at lower throttle settings and think that it made a big difference where at 100% throttle it did nothing.

Agree 100%

[Joshinator99]

Unless you have a positive displacement blower like a LT4, Magnacharger, LSA etc.. Skip the throttle body. So much tuning headache and money for maybe 1-3 rwhp. I've done radical NA builds that literally pick up negligible power on the dyno.. Like can't tell the difference between two runs.

I think people feel the flow difference at lower throttle settings and think that it made a big difference where at 100% throttle it did nothing.

OP has a Whipple, so well worth the time to do a TB (as you alluded to). Just stay away from the ported ones, the OEM & NW/Katech ones work mint.

[TriPinTaZ]

I agree, some of those ported ones are a real pain to tune. And no two are the same in regards to having to tune for them. I actually cringe when I read the mods list and it includes a ported 95mm TB. They are a crapshoot to tune. I can make most behave, but every so often you get one that is just trash and won't do anything you want it to do.


On the other side, the NW103 or Katech, are usually a cake walk. As long as the air model is close, you don't even need to touch Virtual Torque or Throttle Scaler for those. I prefer the Nick Williams 103 over all of them.

[Alvin]

I agree, some of those ported ones are a real pain to tune. And no two are the same in regards to having to tune for them. I actually cringe when I read the mods list and it includes a ported 95mm TB. They are a crapshoot to tune. I can make most behave, but every so often you get one that is just trash and won't do anything you want it to do.


On the other side, the NW103 or Katech, are usually a cake walk. As long as the air model is close, you don't even need to touch Virtual Torque or Throttle Scaler for those. I prefer the Nick Williams 103 over all of them.

Agreed, Nick is/was a tuner first and his throttle bodies have consistently improved and performed really well. His cable throttle bodies are the best IMHO.

[MoBoost]

So is there a way to model throttle air flow, or you just hope that it follows scaled factory curve?

[Alvin]

So is there a way to model throttle air flow, or you just hope that it follows scaled factory curve?

There is not a way to do that as far as I know.

Nick Williams throttle body has been designed to flow like stock until a certain opening.