Throttle body size and a/f

[meanlx]

I'm stepping up from a 70mm tb to an 80. I assume that my a/f will lean out some. Will it be enough to require a re-tune??? FYI....right now as it sits I'm running an avg a/f of 11.0 (10.8 @ 6k in 4th).

 

[nojoke327]

why are you going so much bigger. are you doing any major mods. if you are then you will need a retune anyways.

 

[meanlx]

It's something that should've been changed a few years ago........became an afterthought and since I'm not doing anything more to my car got around to thinking it should be 80mm. I'm running a blower pushing 15# boost w/ 90mm mass air meter. It's already tuned conservatively already, just thought I may need a retune if it's gonna cause a dangerous lean condition.

 

[nojoke327]

i have about 600 flywheel horse and i'm running a 90mm maf and a 70mm tb with 14psi. well the real question is what size is the piping going into the tb. my vortech intake tube matches perfectly to my 70 mm. bigger would jus be a waste

 

[MaximumRisk]

I think you'd be fine. What are you using for tuning? Do you have an A/F gauge (wideband) ?

 

[meanlx]

i have about 600 flywheel horse and i'm running a 90mm maf and a 70mm tb with 14psi. well the real question is what size is the piping going into the tb. my vortech intake tube matches perfectly to my 70 mm. bigger would jus be a waste

We're in the same ballpark. Tbodies should be as close in size to the mass air as possible for a smoother more efficient airflow. Its not so much of a power increase I'm looking for but to fine tune and maximize what I got.

 

[meanlx]

I think you'd be fine. What are you using for tuning? Do you have an A/F gauge (wideband) ?

My car is SCT tuned. No wideband at this time but its on the list.

 

[nojoke327]

well what good would it do if your tb is bigger then your intake tube

 

[meanlx]

It's not.

Also.......would a EGR delete throw a code and trigger a check engine light? If so I'll need a retune to remove that......so I guess I can have them re-eval the a/f while I'm at it.

 

[94Gt5.0]

Yes the EGR delete will throw a code, but getting rid of it is well worth it imo!