Recently bout a GSR bored to 82.5 w CTR pistons, skunk2 stage 2 cams/valve train, 550 rc injectors tuned with s100. Got a deal on some toda c cams, 370 rcs and a p2r fuel rail. Swapped all 3 in, the injectors bc 550s were too big and running rich. Car idles normal like it did but car lost alot of power when i get on it even tho vtec still screams. Are there certain requirements to run the stage 3s? Or do i just need a retune? This is my first time messing with cams so any help is welcome. Im keeping the stage 2s for now incase i have to swap them back in.

 

If you're running rich it's simply because you're not tuned right, you should be able to handle 550's.
Generally, optimum naturally aspirated A/F ratio is 13:1, any richer and you're sure to lose power.

Keep the stage 2 cams, unless the stage 3 is still a Vtec cam, then you can just raise your Vtec and retune accordingly.

[edit] Smooth driving below ~3,000 RPM will suffer noticeably with stage 3 cams, so keep that in mind if this is also a daily driver.

 

already got the stage 3s in along with the 370s, and yes its a daily driver. Seems fine driving down the street but when i get on it doesnt seem to go anywhere. Im taking it for a long drive today so ill see.

 

So...you switched the cams and injectors, yet you did not retune??? The Spec C cams are much more aggressive than the Skunks, therefore, you need to tune. The air fuel ratios will be all messed up.

And another thing, you "shouldnt get on it" until its fully tuned. Unless you wanna rebuild that head very soon.

 

Turned up the fp to compensate and it did help a bit, headin up to jk to get a base tune for now

 

seriously, baby that little bastard until you get dynoed, a monster profile with the wrong maps has detonation written all over it.

 

John reburnes me a decent basemap for FREE today, seems alot better for now. Hopin to get my aem ema sold to pay for a tune