لحن المشاعر
07-03-2015, 07:11 PM
السلام عليكم
طبعا المقارنه تفوقت فيها النسيمو بفرق ثانيه ونص !
في منتدى الكورفت لما احد ملاك كورفت ساله عن المقارنة .. علّق كبير مهندسين كورفت Tadge على المقارنة :
To be perfectly honest, both Chevrolet and Motor Trend were surprised by the test results - both the lap times achieved and the subjective comments on handling which did not match their impressions from the first drive story at Road Atlanta. Obviously the GT-R Nismo is s supremely capable machine engineered for precisely this kind of track work, so nothing against them, but we thought we would do better. After the story was published, we decided to examine that car closely and do a follow up test at Willow Springs.
We first discovered an alignment setting error in the rear. We knew something was wrong with their test car because of Randy's oversteer comments. In the words of our development engineer, Jim Mero, "The car is tuned for a small amount of understeer, but we found out the rear caster was inadvertently set to 2 degrees instead of 0 degrees. This causes ride and roll oversteer". We try to keep the Corvettes used for media tests in perfect condition, but didn't this time, and the alignment clearly had an effect on handling and driver confidence.
We also learned the Nissan was using octane booster, as it will cut power when running the 91 octane pump fuel available locally. Generally speaking, higher octane enables more aggressive spark calibration and higher power. While the Z06 is certified for 91 octane fuel, adding octane boost will offer greater resistance to spark retard and detonation under thermally challenging conditions (reduced likelihood of power reduction when intake temps go up). Racing fuel (100 octane) available at the track improves this robustness even further. We will be recommending that customers who track their car, especially at higher temps, use the highest octane fuel available.
Although we do track testing at quite a number of tracks around the country, we never tested at Willow Springs, so we decided to rent the track and check the performance of the Z06 ourselves. We looked at it as an opportunity to learn something. What Randy told us and we confirmed is that the track has an unusual combination of speed and roughness.
We used exactly the same car Motor Trend tested, as well as a second car, an 8 speed automatic. With proper suspension alignment, we saw a marked improvement in handling.
We also used the opportunity to tweak the calibration of the magnetic ride dampers in Track mode (Tour and Sport modes unchanged), and were able to improve the vehicle’s dynamic behavior. Since we think that calibration is uniquely suited to very rough tracks, our plan is to offer it through our Performance Parts department for customers who frequent those types of venues. So it was a good exercise for us.
We invited Motor Trend to test the car again with suspension alignments corrected and give us feedback on the new calibration. They are planning a follow up article based on Randy's experience, and since we don't want to "scoop" their story I won’t say specifically what the results were. However, I can say we were very satisfied. Look for it soon!
الخلاصـة :
قال ان شفرلية ومجلة موترترينـد كانوا متفاجئين بالنتائج !*
شفرلية قررت تاخذ السيارة اللي جربتها موترترينـد وتشوف هل فيها مشكلة ؟بالفعل عملوا عليها فحوصات وطلع ان فيه مشكلة في نظام التوجيه الخلفي!
بعدين شفرلية قررت تستأجر الحلبة اللي كانت عليها التجربة عشان تشوف اش المشكلة .. بالفعل جربوا السيارة قبل حل المشكلة وبعد حل المشكلة وكان الفرق كبير جدا وجربوا كمان كورفت A8*
بعد تعديل لمشكلة .. شفرلية عدلت المشكلة ورجعت مجلة موترتريند يجربون السيارة وبالفعل جربوها وطلعوا بنتائج مرضية لشفرلية وهم الحين في مرحلة اعداد تقرير عن الموضوع هذا قريب رح ينشرونه*
شي جميل ان كبير مهندسين كورفت في منتدى كورفت يشارك ويناقش مع الأعضاء المشاكل :xyxthumbs:
طبعا المقارنه تفوقت فيها النسيمو بفرق ثانيه ونص !
في منتدى الكورفت لما احد ملاك كورفت ساله عن المقارنة .. علّق كبير مهندسين كورفت Tadge على المقارنة :
To be perfectly honest, both Chevrolet and Motor Trend were surprised by the test results - both the lap times achieved and the subjective comments on handling which did not match their impressions from the first drive story at Road Atlanta. Obviously the GT-R Nismo is s supremely capable machine engineered for precisely this kind of track work, so nothing against them, but we thought we would do better. After the story was published, we decided to examine that car closely and do a follow up test at Willow Springs.
We first discovered an alignment setting error in the rear. We knew something was wrong with their test car because of Randy's oversteer comments. In the words of our development engineer, Jim Mero, "The car is tuned for a small amount of understeer, but we found out the rear caster was inadvertently set to 2 degrees instead of 0 degrees. This causes ride and roll oversteer". We try to keep the Corvettes used for media tests in perfect condition, but didn't this time, and the alignment clearly had an effect on handling and driver confidence.
We also learned the Nissan was using octane booster, as it will cut power when running the 91 octane pump fuel available locally. Generally speaking, higher octane enables more aggressive spark calibration and higher power. While the Z06 is certified for 91 octane fuel, adding octane boost will offer greater resistance to spark retard and detonation under thermally challenging conditions (reduced likelihood of power reduction when intake temps go up). Racing fuel (100 octane) available at the track improves this robustness even further. We will be recommending that customers who track their car, especially at higher temps, use the highest octane fuel available.
Although we do track testing at quite a number of tracks around the country, we never tested at Willow Springs, so we decided to rent the track and check the performance of the Z06 ourselves. We looked at it as an opportunity to learn something. What Randy told us and we confirmed is that the track has an unusual combination of speed and roughness.
We used exactly the same car Motor Trend tested, as well as a second car, an 8 speed automatic. With proper suspension alignment, we saw a marked improvement in handling.
We also used the opportunity to tweak the calibration of the magnetic ride dampers in Track mode (Tour and Sport modes unchanged), and were able to improve the vehicle’s dynamic behavior. Since we think that calibration is uniquely suited to very rough tracks, our plan is to offer it through our Performance Parts department for customers who frequent those types of venues. So it was a good exercise for us.
We invited Motor Trend to test the car again with suspension alignments corrected and give us feedback on the new calibration. They are planning a follow up article based on Randy's experience, and since we don't want to "scoop" their story I won’t say specifically what the results were. However, I can say we were very satisfied. Look for it soon!
الخلاصـة :
قال ان شفرلية ومجلة موترترينـد كانوا متفاجئين بالنتائج !*
شفرلية قررت تاخذ السيارة اللي جربتها موترترينـد وتشوف هل فيها مشكلة ؟بالفعل عملوا عليها فحوصات وطلع ان فيه مشكلة في نظام التوجيه الخلفي!
بعدين شفرلية قررت تستأجر الحلبة اللي كانت عليها التجربة عشان تشوف اش المشكلة .. بالفعل جربوا السيارة قبل حل المشكلة وبعد حل المشكلة وكان الفرق كبير جدا وجربوا كمان كورفت A8*
بعد تعديل لمشكلة .. شفرلية عدلت المشكلة ورجعت مجلة موترتريند يجربون السيارة وبالفعل جربوها وطلعوا بنتائج مرضية لشفرلية وهم الحين في مرحلة اعداد تقرير عن الموضوع هذا قريب رح ينشرونه*
شي جميل ان كبير مهندسين كورفت في منتدى كورفت يشارك ويناقش مع الأعضاء المشاكل :xyxthumbs: