GT350 Throttle body

[K4fxd]

On a GT350 IM is a must IMO. I've been running a 350 IM with an adapter to fit a 80mm TB. Today I rigged up a cai and installed said 87mm TB. What a world of midrange difference. I have a fairly solid tune except for a slight skip off idle. I may need some professional tuning help for this. I am going to try a few things first. I should get some full throttle hits tonight to see if it is flowing more top end air.

So far I'm happy.

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[K4fxd]

This explains the seat of pants midrange boost. It's actually pressurizing the IM, if I can believe the log. I have a mechanical gauge I'll use to verify.

101Kpa

 

[Grimreaper]

I didn't see a change in MAP using an external sensor with a gt350 tb on 2018 mani.

Back to back logs, within the hour to try and keep any weather/baro consistent.

Curious if the gt350 mani will.

 

[K4fxd]

I now know why the tuners took so long to figure this TB out. I have it about 90% but that last 10 is kicking my ass.

I'm not seeing any increase in airflow but my 60 to 120 avg dropped by just over 1 second.

 

[GT 550]

Hey Dan thought you were running the F150 manifold?

Cheers

 

[K4fxd]

I switch depending on if I'm tracking or not.

Not having much joy with this TB. I hit a wall with my tuning knowlage. Back to school for me.

 

[GregO]

Not having much joy with this TB. I hit a wall with my tuning knowlage.

Just out of curiosity, are you using the GT350 throttle table ?

 

[K4fxd]

Just out of curiosity, are you using the GT350 throttle table ?

Yea, I've used files from a 17 GT350, also the 17 FRPP3 power pack. Both work sort of.

I have a slight dead spot in the throttle off idle, it takes off normal then jumps like I floor it, then settles down back to normal. I also have some surging at low RPM high load areas. Like going up a slight hill in 5th or 6th gear under 2000 RPM

It was a used TB, hope I'm not trying to tune a turd......

 

[Acmepwr]

Yea, I've used files from a 17 GT350, also the 17 FRPP3 power pack. Both work sort of.

I have a slight dead spot in the throttle off idle, it takes off normal then jumps like I floor it, then settles down back to normal. I also have some surging at low RPM high load areas. Like going up a slight hill in 5th or 6th gear under 2000 RPM

It was a used TB, hope I'm not trying to tune a turd......

FWIW I had the GT350 tb and cai on my 17, running a 93 AED tune with an 18 manifold and had the same issues. I didn't like it after driving it off and on for a month so went back to the stock tb and it ran perfectly...

 

[DonnieO]

You'll need to do a full write to the frpp strategy. I think it's like 6 credits. It will enable the boxes you can't access on your stock tune.

 

[K4fxd]

You'll need to do a full write to the frpp strategy.

This seems to be the answer. Question is is it worth it dollar wise?

 

[DonnieO]

I think it's worth it since you enjoy tuning.

 

[K4fxd]

I think it's worth it since you enjoy tuning.

I'm reading everything I can on TB tuning......and my head hurts. LOL

This is going to take awhile to sink in.

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