Weav's Vet

A few weeks ago I finished installing a 226/230 .565/.565 111 lsa cam. So I take the car to a dyno to see what gains I had made. To my disapointment I lost a ton of rwhp. Before the swap I had made 297rwhp with bolt ons. On this pull I only got 274 rwhp. I was told this cam should be in the 340 rwhp range +or- a few hp. I had a mail order tune and the AFR was off just slightly. I sent the PCM back and had that adjusted with the rest of the tune staying the same. Went to another dyno and the results were the same as before but with a correct AFR. Very little increase in rwhp. I've been told to degree the cam but the cam supplier says he's installed several of these cams and they were always right on spec with no changing necessary. I replaced the stock timing set with a Cloyes DR 3145 instaled straight up dot to dot. Installed a brand new GM opti. Comp Pro Mags 1.6 rr's, hardened push rods and guides plates, 7/16 rocker studs, new GMPP lifters, EWP, new plug wires, new 104 Autolite plugs, new coil, new ICM, checked and rechecked lifter preload. Rockers hit square in the center of the valve stem. Compression is a little high. I've been told this can be caused by an advanced cam. It ranged from 210 to 235 or various cylinders.

Any ideas on where to start?

Here is the dyno graph after the cam swap.



Here are some dyno pulls before the cam swap

toby

iTrader: (1)

your power curve shows it making peak hp at 5200. with that cam it should peak over 6000. i would start by making sure the cam is installed correctly.

Weav's Vet

How could I have installed it incorrectly? I guess you mean checking to make sure whether it's at the correct degree? Thanks

Weav's Vet

Is it a chance that I have a bad opti causing this? I have read that some have high rpm issues out of the box.

Weav's Vet

No more takers on this one...........

2manytoyz

iTrader: (9)

Id say thats your problem,the cam could be retarded a tooth

SPEED#1

iTrader: (14)

what other mods do you have? ses light on at all?

1993 z28 f1

iTrader: (6)

Hey:

I guess you didn't get a chance to go to the Rock on Halloween ?
Looks like it might be off a gear on the cam or timing somewhere.
Shoot me a pm with your phone # and we see if we can give a hand this week end (maybe).

Dub

When In Doubt Do Without

Weav's Vet

No SES, no codes

Most mods are in my sig below

AChotrod

iTrader: (17)

lol! Looks like a 2yr old drew your dyno graph. Could be the opti. Mine took a crap anything above 6k and worked great when the car was stock.

Weav's Vet

It is bad ain't it. I probably going to start with it anyway. Take it apart for a look see. I have my old one, if nothing else I can try it and see what happens before taking on the cam.