New to the forum folks. Why is there such a wide gap between peak horsepower and torque in the late model G's. When the G first came out, power was 260HP-260TQ, then 280HP-270TQ, then 306HP-268TQ, now 328HP-268HP. Why is Nissan doing this? Why not keep the two figures close like BMW 335i 300HP-300TQ or new Audi S-4 333HP-325TQ. Way back in 1995 the VQ put out 190HP-205TQ in the I30. BMW M3 has this same disparity 414HP-295TQ.

Does keeping TQ at a constant rate but spread across the rev band allow a higher redline for racing purposes? BMWs new 335d has neck wrenching 425TQ - common for diesels. I would like the TQ figures to rise w/o forced induction to get that "pushed into the back seat feeling".

Anyone else think the same. Hope this isn't an old topic.

 

Turbo vs NA vs turbo diesel all different manimals.

 

If you want torque, you gotta go w/ a German.. as simple as that

 

I know they all different types of engines, but there must be reason as to why Nissan is tuning for high redline, high horse but not equal (or near equal) torque like with the first gen '03 G's

Wonder if its a limitation with the new VQs.

 

There are some big blocked V8 fans from America that might disagree with you.

 

I don't think we should have to go German. Look at the M3 with 414 hp but shabby torque figure 295TQ for a near 70k car. Now the Mercedes C63 AMG is an exception.

Look at the 03-06 G35 numbers HP and TQ were close in comparison to the new engines. Our rev limits were 6750rpm versus the newer VQs with 7500 redlines.

I recently drove a 335i and the extra torque was quite noticeable over the new G's and my own 06. Could Infiniti be planning a halo G to compete with the German supercars (M3, C63AMG, S4, RS4) and Lexus IS-F?

 

Ugh.

Go look up the hp/torque curves that NA, turbo and diesel/diesel turbo engines have and why. That would probably answer alot of questions.

HP is a function of rpm and airflow. Torque is a function of displacement (if NA).

Think about why a 1.8 liter GSR motor puts out 175hp and about 130ft lbs torque. While a non Vtec 1.8 integra motor puts out the same 130ft lbs torque but only about 150hp.

 

When the G first came out the adveristed Hp/Tq was calculated with a diffrent method then SAE or what ever its called came out and every one ''lost'' Hp/tq persay.

Just the way the goverment wants to rate it thats all. Unless you dyno it you really wont see what the actual diffrance is.

 

Good point Eljoker, I believe read somewhere (maybe NICO) that the new SAE figures would drop 1st gen G's about 5HP and 5TQ, so in stock form '03 and 04 models would be 255HP and 255TQ and '05 and '06 G's would be 275HP and 265TQ. You are right though, one must really dyno to get true wheel HP/TQ numbers.

 

OP, if you don't understand 1) why a 3.0, 3.5, or 3.7 V6 (VQ motor) doesn't have more torque than a 3.0L turbo (335i) or a diesel 4.2L V8 (S4) or 2) why a 4.0L V8 (M3) in doesn't have more torque than a 6.2L V8 (C63), you definitely need to search and brush up on the general principles of horsepower, torque, displacement, forced induction etc. There is a wealth of information on this topic floating out there.

 

Calsonic - you are probably right. I likely do need to refresh on certain points, but I guess the question is why Nissan is pursuing this path of not keeping those figures (hp/tq) close. I don't know about you, but it would be nice (if I had an 09) to have 328hp and 328tq, but that would likely need forced induction or larger bore/displacement and probably not fit within our front midship platforms...not to mention that a larger displacement engine could throw off the weight balance of our rides. I'll write a letter to Nissan prez Carlos Ghosn!!! I'll refresh on some of the basics, thanks zero.

 

this explains more of the SAE rating and why i mentioned it

http://www.autoblog.com/2006/03/14/n...old-their-hor/

 

260-270 ft-lbs of torque from a N/A 3.5L V6 is pretty respectable I think. There were some V8's about 10-15 years ago barely achieving that number. If you want more torque, you'll either need a V8 or a turbo/supercharger to achieve it.

Nissan is obviously tuning for more HP but at the cost of some peak Torque numbers. Why does this happen? Well just the physics of the particular engine design.

Personally, i like torque values better. A famous man once said "Horsepower sells cars...but Torque wins races" . He was right really. I'd take a nice flat torque curves over a steep horsepower curve anyday.

 

Jeff92se - good point. I'll do some checking. I just find it quite fascinating the route nissan is pursuing. Wonder if the next generation G's and M's will go to an all hybrid line up - smaller displacement engines with lower HP but with electric engines supplying extra HP or will we get detuned VR TT engines like in the GTR. The essence concept seems to point the direction - hopefully.

 

look at this OP
an 04 impala 3.8 liter makes
200 HP SAE @ 5,200 rpm; 225 ft lb

an 04 g35 3.5 makes
280 HP SAE @ 6,200 rpm; 270 ft lb

just engine wise you see a huge diffrence, its just the way the engine is engineered (sp) and germans and japs make better egniges in smaller sizes so to say