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GrimmSpeed Driving Impressions Log

GrimmSpeed

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There’s been a lot of buzz about the Genesis Coupe and a lot of people have been spending many sleepless nights trying to reverse engineer and develop new and better performance parts for this amazing car for a good reason.

What I am going to try and do is give you a personable first impression from four different levels of driving and perspectives that I hope will engage your interest even more about this car if it hasn’t captured it already. We have recently received a 2010 White Genesis Coupe just delivered to our shop here in MN from a NJ dealer.

Here is a general description of what we are going to attempt to do. But first let’s call this Genesis Coupe Genny. We’ll try to keep this thread just like a journal dialoging all the activities of the GC aka Genny during our driving tests.

The first category I’d like to call Community Driving-This is where we find out how this car fits into daily life, does it fit well within the community environment. Does it fit well with your GF and family.

Second-Avoid and Recovery, AutoX, spirited driving that often requires some quick reflexes. Here we will explore the cars agility and how much input is required from the driver to make it happen.

Third-I like to call this our fun session, this is where we have our very own Fifth or Top Gear trials. Here we will joy ride and see just how she likes to dirty dance.

And Forth-Here we’ll do our best to find out just how quick she is on her feet. We’ll be stretching her pretty legs across the quarter mile as well as around a road course for the best lap times we can possibly produce.


So here is the first Chapter:
Over the four days I had been driving Genny I must say this is probably one of the easiest cars I’ve driven. Genny is a 2010 White Genesis Coupe equipped with a 2.0T 6sp MT. The commute thru rush hour was fairly pleasant, the clutch wasn’t heavy and the seats where comfortable, and I enjoyed adjusting my seat with the power controls. The clutch paddle on Genny felt consistent throughout the depression and the engagement point was just below the middle which helps with a quick shift. The gear box has a tight feel while shifting thru the six gears. Making it very easy and it gave you confidence to shift quickly and not worry about mis-shifting into the wrong gear. Although the throw could be a bit shorter(I’m sure TurnInConcepts will take care of this) it wasn’t much to complain about since the linear power band was very useful and the stock rev’s moved just quick enough to not give the average driver any hardship while trying to keep up.

I was very impressed with how well the stock track tuned suspension felt on the road, on the highway and on the back country roads. Thru the stock tire pressure you noticed the road but you didn’t feel all the bumps and defects on the aging road. On an open country road you can feel Genny’s torque push the car from 50mph to 100mph within a few seconds; the power was not noticed on the neck, which is a good thing especially when you have a pretty passenger sitting right next to you. But it was enough to put a smile on your face with encouragement should you need to make a pass.

My wife and kids loved the car a lot. They were so impressed with the ride, how much room there was in the rear seats, how much elbow room was available and most of all how quite the car rides. I will say if you are an elbow driver, you might have to find another way to prop yourself when corning.

Genny transitions very well on fast high speed sweepers like what you might sometimes find on the open highway or country roads. Going at about 70-80mph into a sweeper she does such a great job of balancing the weight my passenger couldn’t even tell.

Safety is always priority numero Uno when you’re trying to do some simple testing on public roads. I don’t encourage anyone to go out and try this, but I have always found it very interesting to see just how well cars will tangle with the on ramp clover leafs on the highways. So picture an interstate with four clovers all pointing in different directions. Now pretend you are approaching the entrance at about 70mph, you tap the brakes for just a second to load the front tires, dial in the steering just enough to point Genny up the ramp and you squeeze the throttle and sit back and watch her go climbing up the hill at a constant 70mph till you reach the top just to come back down the other side.

What we’ve learned from this test is that with FWD cars you lose traction going up hill because the car’s weight is on the back wheels and is having to pull its weight up the hill in a circle, so its not only fighting for traction, but also a lot of understeer. Coming downhill the front end is working very hard to steer and power you thru the turn making the car feel unsettling and squeamish.

With an AWD, we’ve found that with power going to all four wheels they have a tendency to all be fighting for traction almost all the time depending if you’re on the brakes or the throttle. So the tires tend to sing the oprah just a bit early and you exhibit understeer acting like a FWD.

Now with Genny she felt very neutral going up and down the clover leafs at these speeds. At these speeds the stock tires at stock psi were just starting to sing Mozart. The ride felt comfortable and very predictable, well balanced and easy to maintain. In my opinion I thought Hyundai did a wonderful job of getting the car to talk to me, the driver at these levels. I recall a magazine had mentioned the steering wheel feel grounded or didn’t steer back to the center. I think it’s likely due to the larger low profile tires on the front with low tire pressure. You also notice a little heavier feel as well, which is common in cars with similar setups.

I have noticed the rev’s do hang just a bit longer but I’ve found that most drive by wire vehicles I’ve tested have the same experienced. The benefits I’ve found by having the engine revs hang longer are when you’re down shifting, they are smoother which translate to rev matching. And the draw backs are you don’t have the same accurate feed back if you’re driving a high horsepower vehicle and trying to maintain traction.

The shifter knob was designed to be held in a horizontal position and it felt comfortable. The only thing I didn’t like that I found annoying was the leather boot button. I prefer it to be put in the back, it kept bothering my fingers.

The stock power band does a great job of keeping me interested in driving this car daily. It’s not overwhelming and it does a great job of encouraging you to want to push for more. I can see this car having another +50-100whp and still be a great car for the daily commute. You may want to consider upgrading your brake pads, the Brembo’s felt great, but after bedding the pads and a few tests on smooth and unsmooth roads I started to feel some fade and bias from the front tires. The seats did a great job of keeping me.

So in short I am very impressed and I’m giving it high remarks for street daily driving. Oh and I also like the fact that Hyundai gave two options for the “Oh, Crap!” handles the passengers. I have some video I’ll have to edit and than I’ll post them up. I ran out of memory space when I did the clover leaf test, but it’s not difficult to reproduce so I’ll post them up asap.

Our next opportunity will be at a 2.5 high speed road course at the end of the month where we’ll be focusing more on the overall performance. I’m looking forward to seeing Genny stretch her legs while training at the BMW events which has a varity of cars. We’ll see how she handles traffic with the other cars at the track.

Chong
GrimmSpeed Tech
BMW Driving Instructor
 
Well it’s been a very busy four day weekend. My weekend started on Thursday. We brought Genny and my S14 to the 2.5 mile short track in Brainerd, MN. Nice technical track with some interesting turns none the less as you can see from the track map, a carousel, banked turn, fast sweepers and a blind turn at 11.

Well you probably don’t want to hear about all the stuff we went thru to get some of this data so I’ll just keep it simple. One of my students drove a 350Z so I’ll be sharing more of my thoughts about that later.

Here is what we know from this weekends testing.

Genny is very capable of keeping up and surpassing some of the competition as seen in the demonstration, obviously equipment and driver’s skill are subjective factors. There were other more track prepped vehicles we managed to get a pass from that was not captured on this video.

Though we were in most cases under powered, the over all balance characteristics of the car allowed us to utilize just enough braking to maximize our speed thru the turns.

I found these tires to be very predictable on the track. They talk to you very well and wear very nicely. The tread on our tires after three days of testing were visually consistent from left to right on all four. Except for a little bit on the inside of the passenger front tire which is normal for this track. Also the fact that these come from the factory with low depth to begin with helped dissipate heat much better than others, so it maintains grip better over a longer duration and also does not wear down as quickly.

A lot of people had doubts about this car when we showed up, an Audi owner even cursed and made accusations that Hyundai was producing their cars out of sweat factory and swore he’d never buy one to support this type of activity. So I responded that if that was true than I guess he doesn’t own a pair of Nike or any name brand clothes. LOL

I think the video we captured speaks for itself, were we running in the instructors sessions so as far as skills it’s going to be above the rest, another words it’s an even playing field.

Brakes-This is the big one that has been getting a lot of attention. Considering what we already know, things like the red four piston Brembo’s, and the Manufacture cut the pads, and decent feel. While coming into turn 3 traveling at about 120mph if I tried to shorten my braking distance the abs would kick in.
What I ended up doing was first increased the tire pressure from 37 psi to 45 in the front and 47psi in the rear. The tires were wearing right out to the little triangles. The rear probably could have used -2 psi, but we were happy with our results. And I had my guys bleed the brake fluid to dot 4 because the paddle didn’t feel like how they were from the last time I test drove the car.

The other thing I did was I changed the way I was braking into the high speed turns. I started using engine braking in the faster straights coming into the turns to assist since the front tires were slipping and shaved probably 1.5 second, whereas before I was braking 3.5 seconds. If I managed my tires well I didn’t experience any understeer and if I didn’t especially in the carousel we could hear the tires, but still the understeer was manageable.

At 45psi the car still felt comfortable on the road, less tire roll, but still quite enough to hear you carry a conversation with a friend. So my conclusion is the tires broke first. That’s not to say you should not consider getting some better brake pads like what ESPTuning is able to offer. We might have to get some for future testing.

I just could not help but notice while looking closer at the engine bay how this car is such a tuner ready car. Hyundai definitely did their homework. All the vital sensors like the map is near the throttle body for more accurate reading, and also when you decide to install an intake it won’t throw a cel code. The Inlet pipe from the turbo is routed upward to help keep the air cool. The boost solenoid has two separate hoses controlling the intake and waste gate for a more accurate tune. Injectors are top feed for easy access. The list goes on.

Now I want to just mention some differences between the Nissan 350Z. My student’s car was a 2005 V6 standard brakes AT with mild summer tires. The brakes had more initial bite; the car felt more grounded, not quite as much body roll as the Genesis Coupe. And the torque band was more noticeable in the mid range, but that’s typical for the V6. I tested the car in triptronic shift and AT. At first it was kind of hard to drive it in manual shift because I’m use to tapping upward for down shifts and pulling for up shifts so that was interesting, but I discovered it didn’t make that much of a difference since the AT had enough mid range power to keep you moving.

As far as track performance with both being stock I felt the 350Z had more to offer as far as grip, cornering speed and braking. Now if we could get Genny to be like my S14 or better we can really show the competition what’s up?

Enjoy the video’s, I’m still waiting for a word back from my data acquisition tech. I’ll share it if it’s useable.

Many thanks,

Chong
BMW Instructor
Grimmspeed Performance


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[ame="http://www.youtube.com/watch?v=sy-BhMuN4mA"]YouTube - Hyundai Genesis 2.0T vs BMW Z3[/ame]
 
It appears I’m not the only who has made reference to the Genesis Coupe being perhaps the new Nissan 240sx. And how in its time had dominated the market with affordability as well as with motorsport enthusiast. As I had read recent in an article on DriverSide - Advice on Car Repairs, Auto Mechanics, Car Reviews and Values.

We had recently taken Genny out to her first full triple weekend event at Brainerd Raceway in MN. Here you’ll find the countries longest straight on the old road course which is made up of the Top Fuel Drag strip. The weekend events consist of Drag, Drifting and AutoX.

She was down for a month while we took time taking her apart taking measurements and taking a closer look at her finer parts. We are trying to develop ways to improve her overall performance.

Recent Mod’s:
Downpipe
Test Pipe
Short ram Intake
Nitto Nto5 Tires 245/35-19 275/30-19
Linea Corse Lemans 19x8.5 F 19x10 R
Eibach prokit springs with shorter bump stop 1.3” drop

We took her on the 1320 straight twice and did 15.45sec, there was more noticeable power but I think she’ll need some tune time on the dyno to benefit from the recent modifications.

The drift event was a hoot to observe; but to sit in the passenger seat it was memorizing. We had one of our best local Drift driver pilot her around the skidpad. What I found is though the stock setup is not in favor of going sideways, if you plant your foot and steer there you want her to go she’ll follow your lead. Well it sounds and looks just as easy when you’re watching a professional do it, but I found it to not be as such. LOL

So we have some footage on hand and are working on a promotional video, but I’ll give you guys a small taste of what it was like from the side view. Enjoy!

I’m not an avid Autocrosser and never have been, but I do know car control. The course was fast enough for some drivers to hit third gear and tight enough to make your muscles flex.

Here is what I found from the testing I did on this particular course setup. We had switched to Nitto Nto5 Tires Linea Corse Lemans all around. I found more grip going around the course with the traction control off, but also found more understeer in the tight sections especially in the slalom section. And this was an area where I am actually really good at.

On the next day we left the stock tires on the rear and I did find the car to rotate easier with some quick steering and some assistance from the throttle. Having a little less grip in the rear actually helped our times improve and was more fun to drive.

We don’t have specs on the Eibach springs but there was definitely less body roll, transitions from left to right was quicker and forward lateral movement was also improved. The added pipes gave us a much better throttle response and the BOV and engine sounds were enhanced, not only did you notice her new graphics but you also now could hear her presents.

I want to elaborate more on the understeer I found. I have driven many cars and some without powersteering. The feed back I was receiving from Genny especially when we had the better tires on the rear coming into the tight sections/Slalom felt as if the power steering pump as lacking as if it was giving up. At no time did it complain and make noise or the fluid boiling over, but there was some significant delay in the response. The wheel felt very heavy as if I had lost complete powersteering after making the turn and trying to turn back into or around the cones. Tire pressures where also increased, but didn’t make much difference.

There are some small differences on the second day having the stock tires on the rear but the heavy steering was still there but it was easier to manage with the rear end easier to slip.

I have not found any other complains or anyone mentioning experiencing the same issues. I’ll do more testing once we have more suspension added.

Many thanks,

Chong
BMW Instructor
Grimmspeed Performance


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nice articles!

Your point about the larger 275s being an issue is nothing new.

Staggered is never great for fixing understeer.

I'm shooting for 245/35 on a 9" front and 255/30 on a 9.5" rear when it comes time to upgrade.
 
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I found it interesting as well considering I am running Enkei RPF1 17x9.5 & 17x10 Yokohama A032R 255/45-17 F 275/45-17R on my Nissan 240sx, sure there are differences between the two. And I'm not running into the same issues. I am familar with what understeer feels like, I am trying to figure out if the heavy steering wheel feel is from the power steering pump lacking. It's heavy enough where you really have to muscle the wheel back, feels kinda like a FWD w/o power steering, but a little heavier.

We will do more testing to see if we can isolate this theory.
 
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