7AT w/ I-H-C-E Dyno'd

[wstar]

Max Hp: 305.3, Max Torque: 241.2. Current mods are Stillen Gen3 Intake, Stillen Headers, Berk HFCs, Stillen Cat-back. This was a DynoJet at Carboy in Houston, 3 pulls, very humid day. They used 4th gear on the 7AT for the pulls.

Video of all 3 pulls shot on my mini-DV:

[YOUTUBEHQ]gj6MetAjrCY[/YOUTUBEHQ]

I don't have graphs to post yet, but I have the raw data attached here in a zipfile. Unfortunately DynoJet's free software to interpret the data and make graphs is Windows-only, and I only have Macs here. Could someone grab the attached data and make some pretty graphs for me? Preferably include the A/F data too (it's in there).

As I said in the other thread.. These numbers sound a little low to me for full intake/exhaust compared to what else we've been seeing (given that its a DynoJet), but on the other hand (a) This is a 7AT, the rest have all been 6MT so far, (b) It was extremely humid in Houston today, and (c) Every dyno and every car is different. I'm planning to hit a Dyno Dynamics place on Monday if I can, which will provide another good data point.

This is the link to the DynoJet windows software (click "Trying to View Your Run"): Dynojet Research Inc. - Software - Downloads, and the raw data from my DynoJet runs in 4th gear is attached, if anyone wants to process it for alternative graph views.

UPDATE: Attempted 5th gear run on same DynoJet, doesn't fly because with the 7AT's rear-end ratio, you can't top out the revs in 5th due to the stock ECU's speed limiter tripping at 160 mph. Also did a Dyno Dynamics run at EngineLogics (these guys were great btw, highly recommend going there to other Houston-ites), which clocked in at 300 hp and 243 tq.

At this point, I'm kinda suspicious of the DynoJet results, the machine may be mis-calibrated or something. It doesn't jive with my Dyno Dynamics results given what we know about how they typically read versus each other. Attached are various related graphs:

Dyno Dynamics HP+TQ vs RPM (all 3 runs):


Dyno Dynamics HP+AFR vs RPM (all 3 runs):


DynoJet HP+TQ vs RPM in 4th (best run):


DynoJet HP+TQ vs Speed in 5th (only run, incomplete):

[SoCal 370Z]

I know the dyno is adding to the sound, but damn your Z sounds great!

dyno report/video = rep points

[azn370z]

Why wasn't it dynod in 5th gear?

[wstar]

Originally Posted by azn370z

Why wasn't it dynod in 5th gear?

I don't know, why would it be? 4th tops out somewhere around 120-ish mph IIRC.

[azn370z]

5th gear on the auto is 1.0. Most cars are dynod in the gearing that is 1.0.

[wstar]

Originally Posted by azn370z

5th gear on the auto is 1.0. Most cars are dynod in the gearing that is 1.0.

Interesting, does it make a significant difference? Seems weird to me that there would be a universal standard on what ratio to use on the transmission, considering the differential's ratio differs between cars as well, but then again I know nothing about the subject at hand.

[Crash]

It doesn't make a enough difference which gear they dyno it in. 4th and 5th reveal results within 5hp on cars making over 500HP. HP is a calculation of torque (from what I understand).

[zman1910]

Sounds mean as hell. And most cars are dyno'd in their 1:1 gear,but as stated earlier it probably wouldn't make too much of a difference. Either way... nice numbers for an auto although I was expecting more on the torque end.

[semtex]

Originally Posted by wstar

Interesting, does it make a significant difference? Seems weird to me that there would be a universal standard on what ratio to use on the transmission, considering the differential's ratio differs between cars as well, but then again I know nothing about the subject at hand.

I respectfully disagree with Crash on the gearing not making much of a difference, at least for the 370Z. I say this because when I took mine to a DynoJet, the guy did pulls in both 4th and 5th. (2 pulls in each gear.) The 4th gear pulls came in around 10-15hp less than those in 5th for my car, if I recall correctly. In fact, it may have been even more, because I seem to remember that on his first pull (which was in 4th), the hp came in lower than my DynoDynamics number, and when I saw the number on the screen my immediate thought was 'WTF are you doing wrong, dude? There's no way I'm making less hp on a DynoJet than I'm making on a DynoDynamics'. (The 4th gear numbers were so bad that I had those pulls tossed from the graph, so I can't go back and look at them to verify the delta, unfortunately.) I suggest you tell them they need to re-do it in 5th gear. I mean, think about it -- you're getting less on a DynoJet than I got on a Dyno Dynamics (306.4). And I don't even have the headers on yet! I know I've got a 6MT while you've got a 7AT, but there's no way the delta between the transmissions is THAT big. There's just no way. Regarding Crash's statement that 4th and 5th reveal results within 5hp on cars making over 500HP, perhaps gearing makes less of a difference in dyno results the higher the hp a car has? I don't know. I have no reason to disbelieve Crash's statement. But I'm just telling you what I personally saw with my Z when it got dyno'd in both gears.

Edit: Check out this thread: Semtex, RCZ... What gear on the dyno DannyGT got a baseline done today on a DynoJet. 282whp. 5th gear. So the delta between his baseline and your number is 23hp. I know these are different cars, but still, with the full intake & exhaust setup you've got, you have to be making more than 23whp over stock. The cat-back and HFCs alone yield way more than that.

[DIGItonium]

How's your AFR? Also, did you gain or lose response. I'm wondering if headers + HFC + exhaust would have any adverse effects with torque and throttle response.

I may do the same setup, but leave the intakes stock.

[wstar]

Originally Posted by semtex

I respectfully disagree with Crash on the gearing not making much of a difference, at least for the 370Z. I say this because when I took mine to a DynoJet, the guy did pulls in both 4th and 5th.

Hmm, maybe I'll go back and get a 5th gear run on the DynoJet too then.

Originally Posted by DIGItonium

How's your AFR? Also, did you gain or lose response. I'm wondering if headers + HFC + exhaust would have any adverse effects with torque and throttle response.

I may do the same setup, but leave the intakes stock.

The AFR on the graph he gave me was right on 14.0 at 4k RPM (first time it's stable, I think that's where he punched the throttle at honestly), and gently glides down to what looks like about 12.5 at 7.5k RPM.

By response did you mean throttle response? It revs unloaded a lot quicker than it did before, but I think that's pretty much a given. I don't think I've lost any torque at useful RPMs, although I think I've dropped some torque in the very low RPMs (3k and under -ish), just based on feel when driving.

[Supergoji]

ya dude, 5th gear is where you wanna be.

[Crash]

Well, I do agree that 1:1 is always best for dynos, but it's just been my experience that you're still getting a ballpark and sometimes even very close to accurate result in 4th. It's anything less than 4th that things start going way off course.

[wstar]

Originally Posted by Crash

Well, I do agree that 1:1 is always best for dynos, but it's just been my experience that you're still getting a ballpark and sometimes even very close to accurate result in 4th. It's anything less than 4th that things start going way off course.

Well, there's enough doubt on the issue now that I may as well do this back to back and settle the issue for our cars anyways

[DIGItonium]

Originally Posted by wstar

By response did you mean throttle response? It revs unloaded a lot quicker than it did before, but I think that's pretty much a given. I don't think I've lost any torque at useful RPMs, although I think I've dropped some torque in the very low RPMs (3k and under -ish), just based on feel when driving.

Yea, throttle response. I spend more time driving under 3k than anything else, and will go all out once in awhile. There's no surprise with the Z hauling a$$ to redline after a brief late start. HAHA!

The mods are probably overkill for my everyday driving, but it's all in good fun. I wonder how much torque we can recover from having a tune.

This is definitely something to work on this July during my 2-week company shutdown.