My 03 Z is putting down 393hp at the rear wheels with the following mod's.

Callaway Honker and TB
American Racing LT's (no cat's)
Comp Cam 224 / 230 / 112
Professional Dyno Tune

I question the final numbers as it seems all of the other cam only cars in this forum are running 420 - 430rwhp. The tune was performed on a Mustang Dyno and it was explained to me that the Mustang will provide more realistic numbers than a DynoJet.

Your thoughts on this would be much appreciated.

I do have the "heavy" imitation C6 Z06 wheels. Could these be holding the HP back that much?

Thanks in advance for the input.

 

First, you have to take what some owners and tuners say about their rwhp with a grain of salt.
You are just a little on the lower side but you didn't say if that is SAE corrected. Mustang dyno's do have a reputation of being about 15% lower than a Dynojet but frankly I don't know if that has ever been empirically proven. If you use a well maintained and calibrated dyno it should be very accurate.
Now you mention heavy wheels and rotating mass is a real killer for horsepower. You also don't mention anything about your heads and that is good for another 15 to 25rwhp. So if you have the stock heads your number is right in the ball park.

 

Your numbers are right in line for a Mustang dyno. Don't sweat it.

 

Find a dynojet dyno day and get those numbers for comparison - that's what I am doing too...

My 02Z with Honker, LT's and tune made 375 RWHP on a mustang...

 

Yeah, mine with H/C and FAST only did 436 on a Mustang, maybe the same one as above. Vancouver, WA. 'Course the clutch was slipping, and after one run was stuck to the floor.

 

Give it a shot on a Dynojet, and see how it compares.

Also, how was the ambient when you ran it? Temp/Humidity/Above Sea Level/etc...

Then again, the cam size & tune play a big part with the numbers too, but regardless, I wouldn't sweat it too much...

 

should have bought the magic 400rwhp bolt-on's

 

What you should really be concerned with is the comparison gain number. By that I mean what was the number before the mods, and compare that to the number after the mods. I'm happy I'm at 430, but I'm estatic that I gained 70 rwhp from tuning and a cam. My car might read 410 on another dyno, but that 70 number is whats important.

 

Every dyno is different. Mustang dynos do read lower than dynojets but even all mustang dynos read different. The best thing to remember is its always those who go to dynojets and brag about big #s that get dissapointed the most when they go to the track.

A mustang dyno is a better tuning tool than a dynojet because it adds more load. besides that you will only know how your car compares to those others by going to the track and seeing your mph.

Just for comparisons sake I do have a c4 but my 388 dynoed 488 rwhp on mustang dyno and did 547 rwhp on a dynojet. somewhat in line with the 15% corection between the two dyno types.

 

great point. Having a before and after on the same dyno is the BEST thing you can do. Not dynoing before on the same dyno and you don't even know what your #s were stock on THAT dyno.

 

Dyno = device to check relative modification changes.

Ask one of those 430rwhp cars to give you his 1/4 MPH from a track.
Do you know what yours is?

If you post a datalog, we can estimate your A/F through the RPM range.

A better number to work with is average hp under the power curve.

If you have two dyno curves, I can help check this for you.

 

Like said above the only real important numbers are the gain, and the air/fuel readings if you dont have a wideband. Now if you want to see those numbers really get big put it on a Dynapac dyno (hub dyno) and they will read about 30-60 rwhp over a dynojet depending on the load they use.

 

The local speed shop where I live went out of business this past winter. This was a problem for me since all of my baseline and mod numbers came from their shop using a dynojet.
Over the winter, I did a H/C package and wanted to get the car on a dyno and tuned. The only remaining local shop options were Mustang Dynos.

Here is my history of mods and dyno testing
dynojet numbers
Stock 2002 Z06 - 350 rwhp 346 rwtq
with LG LT, hi-flow cats, vararam - 375 rwhp 367 rwtq
best ET 12.11 @116 DA 2900

Mustang Dyno - 2 weeks ago
same mods as above, plus AFR 205 59cc heads, G5X2 cam, UD pulley, 30lb SVO injectors - 412 rwhp 352 rwtq
The dyno operator stated he has seen a 12 - 15 % difference in his numbers vs. a dynojet. I know the only numbers that count are from the track. But needless to say after seeing the results, I had to find a dynojet just for argument sake.

Dynojet - last week
I found a speedshop about 1 1/2 hours away from my home. The results were what you usally see posted.
The car made 459 rwhp 424 rwtq

Moral of the story, you can drive yourself crazy trying to compare numbers. I fell victim to it as I had to find a dynojet "just to see" what happened with the results. Bottom line for me, I want to see what the car runs and picks up in ET/MPH if I can drive it right.

take care and good luck.

 

Maybe my car is scary but with a Haltech CAI, a set of ARH LT's and high flow cats my car tuned in at 401 RWHP and 394.6 rwtq. This was on a mustang dyno with about ten pulls for dialing it in. The outside temp was in the low 60's and humidity was about 65% on this day. One of these days I'll put it up on another dyno just to check the numbers but I am quite happy with the feel and performance from the tune and mods.

 

All good and interesting info..........Thanks!

Looks like its safe to say my Z is within the "norm" specs and not a weakling. I have a hard copy of the run that I'll try to post. Maybe it will bring additional information. I would like to know what BADMFR knows about the magic 400hp bolt on's.

It's been suggested that a 90/90 set up sould be next which would push it over the 400hp mark and heads should follow.

 

Was this from a CAM only? What cam are you using?

...end threadjack

 

, the 70rwhp came from a cam and a tune from ECS. I already had slp longtube headers, slp high flow cats and slp's 3" exhaust. The base line dyno at ecs was 363, after cam and tune 430, so technically 67rwhp, stock untouched heads. Sorry for the hijack reply.

 

Any specs on that cam? Youve got the same basic setup that Im planning and have the power #'s that Id like to get too. I just trying to figure out what cam.

 

Wow nice post

The track is a great tool to see the impact of your mods. Bad part, is as yuo get better, your times may get a better improvemnt then your ets.

BLUFF, when I added LG Pro Lts and a tune, my Ets dropped a ton (12.33 to 11.89). Hell yea 375 rwhp

Added a good clutch, small blower cam, and some bolts ons to keep it together (brace, shafts, water pump...) and it dropped down to 11.5s. 407 ish rwhp

Added a bigger NA cam, heads, fast 90, 90 tb... couple sets of 390s later, drag pack, stage V tranny, lots more ect... 460 rwhp, but only improved to 11.4s Funny part is my short times from 11.5 to 11.4 have dropped from 1.59 to 1.46, but I did change tracks. I am down a few MPH here @ Jackson compared to NAM, and I am hooking up like crazy, which might be dropping trap speed some, but damn, I wish I could get that .2 in ET with the better shorts.

BLUFF dynos are a great tuning tool, and a good way to compare how things should work. Drive it and see what realy happens and good luck!
Dave

Now, much more mods

 

A little off topic but what is this honker you guys are talking about? I may be buying a 2001 tomorrow and would like to know. I don't want to hijack this thread though.