I have a good friend in my home town that has a G37S with an intake. I currently have a custom exhaust(cat elimator) with a high flow resonator on my SRT and I'm curious how the race would turn out. Anyone race a G37S or have any predictions?

Thanks!

 

Actually, I think this might be rather close, based on the stats. He has an
intake and you have some exhaust modifications, and it is probable that his
intake mod will produce more than your exhaust mods. The SRT-6 just
does not seem to be too much benefit from modifying the exhaust. So, I
say take him up on the run and see how it comes out. Then take him
through the twisties and see if he can keep up. Not sure what part of
North Carolina you are from, but there is the Dragon, or a lot more very
fine twisting roads in North Carolina.

Coyote

 

I was about to post about tying into one of those awhile back, but wasn't a real fair run since I am not stock. But, I think you will take him.

 

I have raced 2 370z's that were both the Nismo edition. All i have is an intake and i walked away from both of them with ease. You should have the race without any problems.

 

I raced my buddies 09 G37S. We did two pulls from about 70-120 and I walked away from him both times. Both of our cars are stock.

Race him - it will be fun to put a win under your belt

 

Correct me if I'm wrong guys, but I seem to have read here on the forum
that modifications to the SRT-6 exhuast have mainly resulted in some loss
of low end torque, while the additiion of a larger intake has produced just
around 15 - 20 extra horses.

Now, the G37 S is not supercharged, but the addition of a larger intake
should provide that car with some extra power, and our friend with the SRT
has modified his exhuast, possibly loosing some low end torque. With the
G37 S rated at 225HP stock and the SRT-6 at 330 stock (yes, I know the
controversy on that), it seems to me that this would be a much closer
race than if both cars were bone stock.

So, I think the proof will be in the pudding, and I think our friend may come
back and tell us that it was a very close race.

Coyote

 

I'll just have to splurge and get a NW DCAI before the race. Lol

 

Coyote - not sure where you are getting your info, but the 2008+G37 is rated at 330HP - not 225 as you stated in your post. That's why on paper you would think it might be a close race. However, take a look at the torque - the G37 has a paltry 270 Ft/Lbs compared to the SRT6's 310. That additional 40 ft/lbs makes a huge difference in a race!

Before the SRT6, I owned an 05 G35, which was only 298 HP and 258 torque (dynoed 254 HP, 226 torque at the wheels). I raced my same friend in the same type of race when he first got his 09 G37s, and while he ended up edging by me, the race was pretty darn close. Those infiniti's are only mid/high 13 second cars, and I doubt a cold air intake will give more than 5-10 HP, which isn't going to knock a half a second off to get it down the the SRT6's low 13 second capability.

Even if the exhaust mod slows down the SRT6 a tenth or two, I would wager that it will still win fairly easily. My buddy with the G37 refused to believe that my SRT6 was stock because I walked away from him so badly.

 

Jonnyb, I got my info from a quick web search. BTW, you mention the 2008 G37 S, but there was no reference in the original post to the year of the
particular G37 S. What I found was for the 2010 G37 S, and is quoted below from 'Top Speed" at topspeed.com.

"The 2010 Infiniti G37S is equipped with a 3.7 V6 engine that features an aluminum alloy block and heads with low friction coated pistons, double overhead camshaft (DOHC), and 4 valves per cylinder with micro finished camshafts. This setup allows the vehicle to produce up to 325 hp at 7,000rpm and 267 lbs. of torque at 5,200 rpm".

So, guess we really need to know what manufacturing year this particular
car was built.

Coyote

 

Ah - makes more sense - I'm guessing you meant to type 325 HP in your previous post - not 225.

I stated 2008+ (meaning 2008 and newer) because 2008 is when the G37 came out. Before that it was called the G35. All G37s coupes since 2008 have been rated at the same 330HP, so as long as it truly is a G37 and not a G35, we should be safe in saying it has 330HP (some quote it as 325 or 328 HP, but not sure why - the official manufacturer literature states 330 HP).

 

I work for Nissan, the official number is 330.

And yes, you'll walk it.

G37S is a nice ride, and a VERY well-appointed one... but all those appointments = weight

And the lack of torque isn't helping.

If you see one with an IPL badge, it might be a closer @ss-whipping, as they run mid 13's.

N/A crossfires should avoid them. SRT-6 will have no issue.

 

His G37S is an 08.

Any ideas on why some say we lose power from freeing up the exhaust on the SRT-6's? I feel more of a pull now when hitting passing gear since the exhaust upgrade.

Input?

 

ARGH! Yes, I fat fingered that one. I did mean 325 hp.... my bad.

Coyote

 

Do a search for velociabstract's latest posts regarding exhaust... some good reading.

 

Someone can correct me if I'm wrong, but the main gist of the losing torque in the lowend with exhaust modifications (unless you go all the way up and start at the headers) is related to the loss of backpressure.

If you start at the headers and make your changes starting there, that is a different story. The extra pipe and close to symmetrical length in aftermarket headers would help...but there just isn't anything on the market. Those would have to be one off headers.

There are only a couple of guys here that have that done, the only one I can think of currently is Colin (trizombie)...but I know there are a couple others.

 

Zahanma, were any of those guys using real long tube, equal length to
the collector headers? I thought all I had seen were the shorty log style,
and that those did not provide any additional power and also seemed to
suffer the loss of low end torque. Is there anyone who has really done
long tube headers? Wasn't the issue that there was just no way to route
them in due to the steering column and other items being in the way?

Coyote

 

So, from freeing up the exhaust-I lose some low end power but gain top end. Somewhat of a wash. I'll take losing .10 to listen to my car roar.

 

I've spoken to a custom header fabricator and he quoted me $1200 minimum and that was for a free flowing log style or shorty header. He said it would take some trial and error to see what could be made that the engine would respond to in the limited space. Not really worth it. As far as the loss of low end I can't prove or disprove it because my dyno's always start higher in the rpm range, mainly so the car won't down shift on me. After driving awhile with the delete pipes I still think I lost some low end but the car has enough torque. I don't know about the rest of you but I always get wheel spin in first, no matter what, and second gear too in the heart of the power band. So driving around at 1600 rpms and giving it a little gas it feels weak compared to before. Floor it and you don't notice any loss and you do feel a little extra up top. I have a race on Sunday the 23rd and another on the 30th so I should have some good race track information about the downpipes before too much longer. Back on topic ..... race him, beat him, be gracious and be safe.

Les

 

I got the old LET shorty headers on mine and I recently got a new exhaust (cat delete/res delete/ real dual exhaust/dual magnaflows). Seat of pants view is that it gained some rwhp. I dynoed it before without the headers and with stock exhaust, mail in tune, and single Needswings CAI. It was 347 rwhp. Feels alot stronger now.

 

i would just get a single cai, you gain nothing with the dual cai. as for the modded exhaust, i have a straight through muffler and gutted rear cats and i picked up a few mph in the 1/4 mile and the 1/8 mile. the stock exhaust on the srt6 is actually very efficient.

if you made the mistake of going with a smaller diameter exhaust pipe or muffler like some on here have then yes your srt6 is now slower than stock.