| MixManMash |
I just took my car to Apex Modified today for the NECC Dyno Day.
I took 3 runs and had they were very consist. I am pushing about 281 HP and 296 lb-ft at the rear wheels.
It just doesn't sound right considering the only mods I have is a Single Pop Charger. I was expecting around 240 hp...
oh well. any input into why my car is running those numbers? not that I'm complaining.... |
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| Z32NUT |
Take your pick:
1. Air density (elevation, atmospheric pressure)
2. Ambient temp
3. Fuel quality (ads are best belived by kids near Christmas)
4. Dyno calibration
I know I wouldn't complain about those numbers from a stock TT. :) |
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| Inzane |
A stock 5-speed TT is supposed to put down typically about 245-250 rwhp.
A POP charger intake is supposed to be worth about ~20 bhp (aka at the flywheel) alone, so a bit less at the wheels.
But that still doesn't account for the difference. Are you sure the intake was the only thing changed? Is your timing advanced at all? Any of the cats removed from your exhaust? etc.
Apex's dyno is pretty good. We've tested numerous 300ZXTTs now to know they set it up well enough that our numbers typically jive with the guys down in the US.
BTW Darryl, the DynoJET software uses correction factors to account for differences in ambient temperature, pressure, etc. (however the correction factors are generally more accurate for normally aspirated cars.)
But anyway, congrats on the numbers MixMan! Definately sounds healthy to me. But I would be curious to see if there's anything else there that's given you a boost. |
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| MixManMash |
Yeah no doubt. Maybe the two large blowers that the put in front of my intercoolers gave me a bit of boost :)
I think I am going to invest in an after market boost guage and see what the car is really boosting at before I do any other mods. Who knows, maybe somebody put some boost jets in to increase it to 11 psi... I have heard of guys doing it with the stock ECU... Or maybe the car has a JWT ECU in it with boost jets, but I really doubt it as my ECU still has the original Nissan label on it (unless somebody socketed the ECU ~ might have to crack it open to check).
I am not sure if the timing is advanced any further than what it should be. That is something that I would need to check (any hints). The cats are still in place, including the pre-cats on the downpipes. |
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| vorpalz |
Wow, great numbers! I was pushing 260 hp + 266 tq with POP charger and mufflers (no catback) on the stock ECU ~ 9 PSI
I got up to 292 hp + 326 tq with a JWT ECU + boost jets ~ 14 PSI in '04
This year, with DP's and ~ 16 PSI I managed 335 HP + 379 tq with a slipping stock clutch. Also found and fixed a couple of boost leaks before the pulls.
Did any other Z32's dyno?
Congrats, and check your chip!
Regards, |
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| MixManMash |
Thanks. If I get time today, I'm going to open up the ECU and check for the chip.
No other Z32's dynoed but there were lots of S13's and S14's. There was one Z31 turbo that managed 203 hp and 280 lb-ft torque.
One S13 with the SR20DET conversion, stock turbo with boost controller managed to do 249 hp and 260 lb-ft of torque. |
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| Inzane |
quote:
Originally posted by MixManMash
going to invest in an after market boost guage and see what the car is really boosting at before I do any other mods. Who knows, maybe somebody put some boost jets in to increase it to 11 psi... I have heard of guys doing it with the stock ECU...
You know, I was just thinking of that very same thing this morning. That is definitely a possibility.
As well there was a bit of variability from car to car on how they were from the factory. The average stock boost seemed to be around 9 psi, but ranged from 8.5psi to 9.5psi. Back in '99 when I first added my JWT ECU w/ jets, my boost was only ~8.5 psi before, and was ~13.5 psi after. But hard to say if I had any boost leaks back then. |
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| MixManMash |
I've been doing some thinking and some more research. I think that Apex's dyno might be out of calibration (if that's even possible).
There was a Nissan Sentra SE-R Spec-V with the QR25DE (rated at 175 flywheel hp) only two mods:
1. Cold Air Intake
2. Catback Exhaust
This car dynoed at 170 hp at the front wheels on apex's dyno. I did my research and most stock QR25DE's dyno at about 141 hp. I don't think it is possible to get 34 wheel hp out of the above 2 mods. In fact, I found that people who are pushing 170 hp have the above two mods along with cams and headers.
So.... and remember how I posted earlier a 14 psi SR20DET pushing 249 hp and 260 lb-ft of torque. From some brief reading, I found it is possible after way more mods than just an exhaust and CAI. You have to start getting into cams, headers, etc. And this guy told me everything on his SR20DET was stock including the turbo.....
And of course there is me with my 280 hp and 296 lb-ft with only a POP charger (I still have to verify that I am boosting at stock, which I am pretty sure I am).
So I am starting to wonder...
Is it possible for a dyno to go out of calibration? |
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| Inzane |
quote:
Originally posted by MixManMash
Is it possible for a dyno to go out of calibration?
I believe it is... possible.
If not in calibration then in how it is "set up".
But that would be really surprising if Apex's dyno has gone "off" the mark.
Back in June we dynoed my 100% stock '01 Sentra SE, and it was BANG ON within a horsepower or two of a couple other published sources. So I know for that day at least (and for normally aspirated) it was good. But I am planning to go back shortly to do a couple pulls post-CAI install (again something I can compare with other data), as well as grab some baseline numbers for my wife's 05 Altima 3.5SE. So I'll let you know how that turns out.
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| MixManMash |
| Sounds good. I'd be interested to see what you find out. |
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| bmwboyz |
| whos se-r did that 170whp? mine did 150hp and 164tq. i have catback and cai. |
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| MixManMash |
| Not sure what his name is. But you are helping to prove my point that Apex Modified's dyno is out of calibration. |
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| bmwboyz |
| you think 150hp and 164 tp sounds out of wack? i though tthe hp was a little low but i dunno is there any other dynos in town? |
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| MixManMash |
not your numbers. I think the numbers of the SE-R Spec-V that I mentioned are out of whack (i.e. the 170 hp). Your number sounds about right and very reasonable for a CAI and Cat-back.
I think there are some other dyno's in the Edmonton area. In fact, I know there is a place out by Sherwood Park that does dyno tuning. I believe the name is Advanced dyno tuning, but I will check again. |
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| the_saint |
quote:
Originally posted by bmwboyz
whos se-r did that 170whp? mine did 150hp and 164tq. i have catback and cai.
My 2003 Spec V
I dynoed 157 hp/167 tq with CAI/Header and axle back. This was 2 years ago at Apex Modified.
The car is quicker now with full 2.5 mandrel bent exhaust.
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| nis_mo |
| i belive the spec you are thinking about is chasenyadown (sp) he has an intake exh header safc2 cams etc. |
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| bmwboyz |
| chasenya's engine was fucked so he didn't get that high of nums, i think he got 160ish for both. but he has new engine and alot of shit done im sure its much higher now. |
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