Paxton car, going with larger diameter throttle bodies, do I need to retune?

[Vital Velocity]

? ?

 

[plumcrazy]

i was told it was a waste by DLM and joseph dell who did some testing on his paxton car back in the day with them

but i assume anytime you have more fuel going into the engine, its going to need to be tuned

 

[Doug Supercharged Vipers]

If your on the borderline of a lean burning engine then I would suggest having your mechanic at least check the tune.

Listen to Phil, he taught me everything I know

 

[Vital Velocity]

If doug says it, then it is so. Thanks for the heads up guys

 

[Black Moon]

Will someone tell me if I'll benefit from a 2 bar map? Stock system except DLM cooler and gen 4 investors.

 

[Jack B]

In general, your volume of air is limited by the total resistance (entire intake track) to air flow, the throttle bodies are probably a small part of that. If you gain any flow at all you will also gain some power. The odds are it will be minimal, therefore, the change in a/f at wot will be small.

You will not see it at all in closed loop since the O2's will try to keep you at 14.7. In that case you will also see the LTFT go up.

 

[99 R/T 10]

If you can get a set cheap, do a back to back dyno run. Stock vs. 70MM. I bet you pick up 10+, but not much more than that.