Turbo V6 Camaro

I am looking at a more aggressive cam for my V6.

I have been reading a lot of things, it seems if i monitor the back pressure that would tell me how aggressive i can get with the cam profile

Has any one done this on any turbo setup? what were your findings?

It seems the less back pressure you have you can get away from split duration 235/225 and run 235/235 or run even l split 235/245

any input welcome

current cam 224/215 116*LSA

engineermike

The theory is that the higher the backpressure, the more "different" the cam needs to be than NA. So, if the backpressure is 1:1 with boost, you'd cam it just like you would an NA motor. However, my backpressure is 2:1, but my 224/236 works quite well.

I also have this crazy theory that the cam somewhat determines backpressure. For starters, the higher you rev an engine, the higher the backpressure goes. Secondly, a lot of overlap will "even out" the pressure by allowing reversion from exhaust to intake.

Mike

Shawn @ VA Speed

iTrader: (3)

have you tried any other cams with the same combo?

engineermike

Yes, I swapped to a 226/226-114 and lost power. I would up putting the 224/236 back in.

Turbo V6 Camaro

that the data i'm looking for, i know it's apples to planets but the physics should stay the same i just have 2 less bang rooms

are you running "header type" or "log type" ?

Two things:

1. did it affect spool between the cams?

2. did the cams affect back pressure (did you test? I assume not? )

3. would larger hot side rduce the back pressure to alow the other cam to run? or would the more lag not be worth it even if it made more power?

any more data/input please post

i'm thinking of a 235/242 at 115 LSA if my back pressure is in check

engineermike

1. I'm not sure if it affected spool time.
2. That was before my backpressure-testing days, but it was probably lower with the 224/236 cam.
3. On LT1's, the 224/236 is a good NA cam. So, lowering the backpressure should theoretically only make this cam work better.

Sorry for the lack of data. I tried the 226/226 cam a long time ago and was disappointed so I put my old "supercharger cam" back in it and quit listening to "common logic" on turbo cams.

Mike

Turbo V6 Camaro

any other input from anyone else?

crashly

yeep from a 355sbc v8 tho
engine on dyno , twin 57mm turbonetics
cam 1 : 237/237 @ 114 with .509 total lift , installed @ 110 intake centre line

cam 2 : 256/245 @ 114 with .510 total lift , installed @ 110 intake centre line


Cam 2 made MORE power for same boost, more torque for higher into rpm range. back pressure was less , higher up in rpm range.


these where flat tappet cams.


258/258 @ 114 roller ....now thats a different story all together....
ash

Turbo V6 Camaro

sweet,

anyone tested many cams on the same set up just because?

i was also sugest a 233/233 112 lsa buy one cam person ~9 over lap