Surging/bucking at highway speeds

[SVT_Z06]

I'm getting some surging/bucking at around 1800-2100 rpms at 75-82 mph on the highway in 6th gear. C5 Z06 mainly stock with 36 lb injectors. Do the throttle follower/cracker tables need attention? VE and all other tables are good.

Increase or decrease decay for smoothness?

Thanks!

[MikeOD]

Surging and bucking in that RPM range with a "mostly stock" setup sounds suspicious...what defines mostly stock? Stock Cam? Cold air intake? Why does it have 36lb injectors in it? How do you know VE and all other tables are good? Post the tune and mods.

[regorih]

First thing that comes to me is:
-Was the injector data updated?
-Did you do any MAF & VE tuning?

[SVT_Z06]

Yes, I have the proper injector data. Maf and VE were tuned, but I think I need more VE < 2000 rpms. I'll try that.

Vararam, LS7 exhaust Manifolds, 36 lb injectors.

[GHuggins]

I think it would help everyone if you posted the tune, log and build list with actual named parts used. 36lb injectors are very vague and all 36lb injectors ARE NOT created equal or give you the correct data to use Are these the absolute only mods? This shouldn't be bucking at all if everything is correct........ When does the bucking occur - very light throttle? Even though they shouldn't, it is possible for the manifolds to have a different O2 location and throw off your actual air fuel ratio while the O2's will "think" they're switching correctly. Compare O2 settings to the platform you got the manifolds from - verify they're correct...

Hope this helps.

[68Camaro]

mainly stock means he has a T-Rex cam and bolt ons lol