A&Q about 350Z
Q:
Hey guys,
We have just tested the Helix prototype exhaust and got very good result with it. The exhaust sounded a little deeper than the stock exhaust and produced great whp gain. Also, please keep in mind this is a stock 05 350z with no modification except for the exhaust.
Here are some pictures of the exhaust:
Here are the dyno graph (4wd Mustang on 91 octane):
Before (stock Z):
After (with Helix prototype exhaust):
Comparision:
Thanks,
Tom
510-783-5300
Gruppe-S Engineering
29150 Simms Ct
Hayward, CA 94544
510-783-5300
www.gruppe-s.com
Contact: Tom
A:
shouldnt 350z's put down a lot more power than that?
I havent paid attention to other people who have tested their cars, but that looks to me like nissan is horrifically over-rating them
A:
I am wondering about that 210 for sure! Have seen charts with about 225 - 240.
A:
yea that seems low but it isnt unheard of...all dynos are different and conditons will vary from day to day so the only thing that really matters is the comparo with the base
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03 CS Touring
VIN #189
A:
so mustang 4 wheel dyno systems are just flat out incorrect then? any decent system should auto-correct for ambient conditions.
guess not.
A:
no they arent wrong, its just going to give a different reading than a Dyno-jet as yeperra mentioned. For this case though the only thing that matters to find out the effectiveness of the mod is comparing it to the base dyno.
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03 CS Touring
VIN #189
A:
hm
CS TRG
A:
Hey guys,
I just wanted to clarify on the operation of the Mustang 4WD dyno.
The Mustang 4WD dyno is an eddie current dyno. What this means is that the dyno is "loaded" through the use of a very large electric motor. Therefore we can enter the vehicle weight and "load" the vehicle similar to real world conditions. This is absolutely critical to proper vehicle tuning.
Compare this to a dynojet which uses the drum itself as its inertial weight. No matter if you're a 5000lbs Mercedes or a 2400 lbs Lotus, you'll be receiving the same "load", and the load will only exist upon acceleration. In our experience tuning cannot be properly done on these dynos and will result in skewed real world conditions which can be harmful to the vehicle.
Our dyno is also a connected 4WD system. Those of you which have dynoed your 350Z's on a 2WD system will know that when you turn VDC off, spin the rear wheels without the front wheels spinning, the VDC system becomes VERY unhappy. This usually results with the slip light flashing and the car stalling right after you pull it off the dyno. Some cars such as the BMW M3 cannot even be properly dynoed without the front wheels spinning.
Our dyno forces the front wheels to spin through the use of a Kevlar drive belt. In other words the front and same wheels are traveling at the same speed as it would on the street. In an era of traction control / ABS sensors on each individual wheel, this is important to achieve real world conditions.
As for comparison, a 300HP STI makes 220-225 whp on our dyno, and the 280whp Evolution VIII makes about 210-215whp on our dyno.
Cheers,
Gary
Gruppe-S
Gruppe-S Engineering
29150 Simms Ct
Hayward, CA 94544
510-783-5300
www.gruppe-s.com
Contact: Tom