99blancoSS

iTrader: (115)

Talked to Tom and he said 411 hp with a little more torque.

Need advice from experienced guys please. I have a 9" with 3.89 gears.

I put down 410hp and 385 tq before with my 10 bolt and 373 gears and a tr224 cam and stage 2.5 5.3 ltre heads.

Tom says the graphs pretty much overlay. WTF !!??!!

I have terminator heads now and a 234/240 cam I repeat WTF

Mikey 97Z M6

iTrader: (37)

Damn, that's not very good news, although it is through a 9" and the engine isn't fully broke-in yet. I'd put some miles on her and let everything seat-in then retest it. The 9" is def. sucking some power, for sure.

On a side note, I thought those Edelbrock heads were designed more for larger cube engines, maybe I'm wrong there? But, on stock cubes I think I would have stuck with the 5.3's. Any idea what you're new combo has for CR? What cam is that, and the specs (LSA, Lift etc..).

Sorry, I totally spaced that you were dynoing at Toms yesterday. I was going to try and make it down there.

Mike

99blancoSS

iTrader: (115)

They are small runner heads. They're supposed to be good for the the 346. I had them shaved to 11:1. 59cc's I think or 60. Spoke wiht LME and they said I needed to check lifter pre-load with the lifters I have and not just torque the lifters to 22. I didnt do that. So its possible that could be an issue. Toms not in yet, left him a message. Might as well have him check it while it's there.

Mikey 97Z M6

iTrader: (37)

That'll def. make a difference if you didn't check pushrod length, especially with a milled head.

Mike

99blancoSS

iTrader: (115)

Well I questioned it with them when we were going over the build and they said the 7.4's should be fine. Its the gm hi pef lifter that are requireing the lack of load. They didnt tell me that.

turbo50

Thats a bummer. The rearend is sucking a bit more power. If I remember right Mark lost like 12 rwhp or so with just the 9". So does this mean your price is coming down?

michael402z06

iTrader: (15)

Take it to the track and note the difference in traps and e.t. Dyno's are a tuning tool, nothing more.

Rottluver

iTrader: (3)

Couldn't agree more.....I went from standard bolt ons to LT's and true duals and a custom tune and my hp AND tq were exactly the same before and after.......granted it was 2 diff dynos but they were the same brand......bottom line the car was faster at the track even though the #'s for the engine didn't change.

99blancoSS

iTrader: (115)

No just means I cant raise it.

Talked to tom about it a lot. The day I dynoed 410 with the tr224 and the other heads was like the perfect dyno day. Cold crisp air, no humidity to speak of, somewhat sunny day.
Yesterday was like 45 degrees and 80% humidity. So the general consensus is that
1. those prc heads were actualy damn good for the money
2. I'm losing due to the 9" and the gears
3. Crappy day to dyno
4. I need a 90/90 to get an extra 15-20hp

Z06's on his dyno with lg headers and the Edelbrock heads are putting 430 down on his dyno. They have a better exaust and minus the 9inch.

00Vette

iTrader: (4)

I strongly agree. Its nice to see good numbers, but it all comes down to what happens at the track.

I would also recommend what michael402zo6 said. Take it to the track and evaluate the difference there. If then you find a small to no gain from the change..............that would be a good time to address it as a problem.

00Vette

iTrader: (4)

BTW, do you really have a 402 in your Z06?

jimbob

iTrader: (4)

Easy horse power......E-pump, No cats, cut-out, No 90/90 with large 315's on the rear. Figure 5 (tires and wheels), 20 for 90/90, cut-out 10, no cats 5 and e-pump 5-10. On a mustang dyno I could easily think 440-450 (470-480 on a dynojet) could be had. Putting right in line with most using a 9 inch/12 bolt car. It's the little things that make a difference...as far as heads go on a 346ish cubed engines, I'v seen 20rwhp gain on the low end. 30 rwhp gain on the top end. And now up to 40 with right cam and work on those new trick flow heads...So, for the most part your horse power gain is going to be in the little things and the right combo of head/cam and DCR to get the combo tweaked in...It looks like the cam/head combo is good so, now on to the "Little Things"

93TAWicked1

iTrader: (28)

I agree with Jimbob, you have 2.5 inch collectors running into the cats. The only thing that strikes me as strange is the peak HP RPM's like we talked about. Other than that its a pretty damn good dyno for a stock cube motor with the car not setup for ALL out dyno HP.

I mean 411rwhp on a mustang dyno with a 9inch and big "heavy" tires is nothing to laugh at.

chaman

iTrader: (5)

Who cares about dyno numbers anyway??!!!

WAHUSKER

iTrader: (4)

I agree with Jim, get rid of the restrictions. It probably wasn't an issue before, but is is now. And are you really only running 30lb inj's? Those might be maxing out with that setup. I'd get some 42s & see what it does. With 11:1, those heads & that cam you want it richer, like around 12.5:1 a/f.

And I lost ~5% thru my 9" & gears but ran 3/10ths faster.....

Racehead

Dyno's are funny that way. I went from 338 rwhp on an '01 WS6 with nothing more than a Borla, to 340 rwhp with hvmc QTP's/ORP/Borla and tuned I didn't know what to think until I finally took it to Pacific and it had picked up 3-4 mph I think your #'s sound pretty good myself 411 rwhp anytime of the year, and on any dyno, usually means your car is getting pretty fast

Bill

93TAWicked1

iTrader: (28)

Please explain this, I only ask because I'm at a little bit more horsepower and have 30 pounders which seem fine and I'm a bit leaner than that as well closer to 12.8

WAHUSKER

iTrader: (4)

Go to RC Eng's website & check what their formula says for inj Bobby. Many guys get by with a smaller inj, but 411rwhp on a Mustang dyno thru a 9" is around 575 at the motor. That's 200 over what the stock 28 inj's were feeding. So IMO 2lbs aint enough. I think my 30s were at 90% duty cycle with 390rwhp thru the 10 bolt.

And whenver I bump the comp ratio, I always add fuel. The exh gasses are getting hotter & I think the O2s get fooled. Besides, motors just seem to run better & live longer that way.

93TAWicked1

iTrader: (28)

Opps makes more sense should have specified I'm running 30 SVo's which are at 36 on an Ls1 right?

I'll stop with the hijack now

99blancoSS

iTrader: (115)

I've got the SVO 30#'s as well. Is it possible to have my headers opened up to 3" ? By heating and using a pipe expander?