JasonSB

Had my car tuned yesterday after adding a ported MSD manifold.

Mods are longtubes, intake, small cam, reworked heads(not milled), MSD manifold.
533 RWHP 501 lbs Torque.

Adding the intake it picked up 20 RWHP and 25 lbs Torque. I was figuring it would pick up more than that considering the guy I bought the MSD from gained 40 RWHP.

My tuner felt the cam is holding it back a lot and should go with something larger.

When I purchased this car it had everything done to it except the MSD. I called the shop that did the work and they said it had a smaller cam. I think the Camshaft specifications: 240/248 duration @ .050 .644/.651 with 1.8 ratio rocker arms 114.0 CL.

Is that considered a small cam? I was thinking maybe doing a BTR Stage 3, but I dont want to blow the money if its only going to pick up a couple HP.

Car runs great and I'm happy with the Torque number.

Any suggestions?

Navy Blue 210

Most higher numbers have at least +12-14* exhaust split especially with
a 240* intake duration, BTR Stage 3 maybe 12-15 more depending on
Head work.

CMNY

I have a BTR Stage 3 with the same mods as you minus the intake and my AHP heads are ported but the car did 542 on a dynojet.

edmundu

Split is narrower than most LS7 cams, but I don't think the cam is the reason for the lower #'s. Could just be not enough octane fuel to run the needed timing, or afr is a little fat or lean. Some cars like it lean others not. I would assume your tuner tried all that, but just confirm.

So the heads are essentially stock just replaced guides, right?
What about TB?
What plugs are in it?

I wouldn't go swapping parts just yet. I would datalog it, and see what the timing advance is, fueling, etc...

IF you bought the car with the head/cam work done already. Pending the datalog results, I would do a leakdown test to confirm there aren't any mechanical issues.

JasonSB

Heads are stock with replaced guides etc..
Stock TB
It has upgraded plugs

Timing is 22 and A/F from the dyno looks like 12.5

Da Z06

Gains of 20/25 HPTQ gains are typical, 40RWHP gains? Doubtful.

JerriVette

Dynos are sales tools ..

Just enjoy your ride.

Very easy to manipulate Dynoresults.

Jmo

lamboworld

I would say that these numbers are low and I would like to hear the explanation on how you manipulate Dynojet results. Dynojet corrected numbers are pretty uniform and why would a tuner want to make their resutls look low. Wouldn't we expect to see the opposite.

Anyways, I have a small cam, 226/246 114+2 and I am making 585/518 with similar mods.

edmundu

Those all seem good. So long as that is what was logged. If that is what is commanded in the tune, you may not be seeing those actual numbers.

yellowzron

Dyno numbers dont mean crap! Go out enjoy the car and see what your trap speeds are. If you are trapping 133 you are great. If you are trapping 119 there is a problem. I hate Dyno numbers!

MTPZ06

Agreed. I honestly think a lot of dyno operators/tuners like to tell customers that their dyno is stingy, nick-named the "heart breaker", etc., merely to manage the customers expectations.

LS7Solstice

Doesn't sound like those numbers are really disappointing if you're happy!

Silver Bullet C6

That cam has the exact specs as the 21st Century GT 13 cam. I have the same cam, but on a 115 LSA, ported FAST

RamAir972003

Porting your heads and milling them 11.8 1 should give you 30hp also 22 degrees of timing is ok you can add more 24 25.....

Tony @ Mamo Motorsports

I have helped many folks with ported MSD's that have seen 35 - 40 RWHP over a stock LS7 baseline (40+ on some of the aggressive builds and only when a 102 TB was also in the mix) but ALL of the cars that saw the larger gains had good internals already in play.

Honestly, your warmed over stock heads are what's really holding you back....and the cam but to a much smaller extent.

A really good set of heads would completely open up the top end of the curve (and increase the area under the curve as well) but the bigger gains would be up top where your current combo is lacking a bit.

When your up for wrenching again (and spending more money....LOL), hit me up and we can discuss my MMS 265's (milled for more compression) coupled with a more ideal cam profile....trust me it will be a whole different ballgame when you go back to the dyno (closer to 600 RWHP I assure you).

Big numbers aren't easy to come by....you can't leave anything on the table if your looking for big numbers....especially heads which are the cornerstone on any serious build no matter what type of racing we are discussing. Everything else plays a supporting role to the heads.....they are the star of the show....the doorway into and out of the cylinder/combustion process where all the magic (cylinder pressure) is happening.

Omitting a premium set of head and expecting a good number is only wishful thinking but the dyno doesnt rely on that.....only all the math and the physics involved in a high performance internal combustion engine....everything else is window dressing....LOL

Your gains are solid with what you currently have as a baseline.....20 HP and 25 RWTQ is a gain you really feel....enjoy where you are now and start planning for round 2



Regards,
Tony

Unreal

Its funny to see people doing basically the opposite, huge cams and stock or questionable heads, and expecting big numbers. I much rather see a really good set of heads and a small/mild cam. You would get a much better running car than trying to just cam the hell out of it for power.

lamboworld

This is what I did. Small cam, ported heads, ported MSD and full exhaust. 585/518

TXGS507

Niiiiice

Michael_D

You cannot expect a camshaft with an 8 deg split, and 240 intake duration to make power with stock heads. Ain't gunna happen. Frankly, that cam is retarded and not an optimal grind for this engine. You would probably pick up 20 hp by doing nothing more than REDUCING intake duration 10 deg and leave everything else as is.

cv67

Leave it alone and enjoy it.


Op theres a lot of bogus sheets floating around out there dont worry about it.