I just had a Vortech SC installed with a 9lb pulley and a borla duel exhaust. Though I am quite impressed with the performance, I have the itch for more.

How do I get more torque and torque & hp earlier in the curve.

Currently my max hp is 386.5 and my torque is 314.73. I would like to see my off the line performance improve.

Cams?, Headers? Forged interals? What about new heads? Any ideas on the costs of these mods.

 

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Edge racing torque converter You should notice a major difference in low end torque. Like enough to make you think you need wider tires in the rear.

 

cams heads and headers are going to give you mostly midrange and topend power. though some less aggressive cams will give some low end oomph. if you want more low end you could increase displacement, increase compression ratio, or add nitrous. there is little that will truly add a lot more lowend other than those. a positve displacement sc or a turbo will have boost much lower and a better curve also.

 

try out that torque converter. sounds like a plan but make sure its reliable and has wome kind of warranty.

 

has anyone changed the gearing to give a little quicker acceleration down low?? (i realize this isnt increasing low end power, but rather performance instead)

 

I second Edge Racing Torque Converters

Ask for Andre

 

Okay I need an education. What exactly does a torque converter do? Convert hp to torque?

I assume it is part of the tranny. What kind of costs am I looking at for this mod? Parts and install?

Does this put extra pressure on the rearend, and should it be something I am concerned about.

Thanks for the responses!

 

I agree with 12secz....edge torque converter . Thanks Max for telling me about Edge . More than .6 of a second off my 1/8 mile time

 

a torque converter actually multiplies the torque.

another thought is a nitrous setup that only comes on at full throttle until a certain boost level is reached and then automatically cuts out.

Stillen had a setup like that for the 300ZX TT a while back, don't know if they still do.

 

http://auto.howstuffworks.com/torque-converter.htm

 

2003z,

Thanks for the link. This really filled one of my knowledge gaps. Thanks for sharing!!!

 

Torque converters do not multiply the torque.

A torque converter is the equvalent of a clutch in a manual, but it works much differently. It is a viscous coupling between the engine and transmission. It uses two impellers and as one spins, it forces hydraulic fluid through the impeller creating pressure which spins the other impeller. This is connected to your trans, and in turn turns your wheels. At low speed the impeller does not create enough pressure to spin the wheels, hence the reason you can come to a stop.

A "better" TC will create more pressure at lower rpm. They also have lockup TC's that act more clutch-like usually past 30mph to free up some additional HP.

A TC will be a good buy for you, and swaping out the rear end will definitely give you some more low end, but you will sacrifice some mpg with the gear swap.

 

Houston has FI, I think that he wants to keep his tall gearing. See also: https://my350z.com/forum/showthread....threadid=79101

 

And I thought the modern torque converter's major components were... the cover, impeller, turbine, stator/sprag assembly, and lock up "clutch".

Since you've stated that the torque converter doesn't multiply torque, would you share with us what function the stator serves.

I've attached a picture of the major components for reference.

Thanks in advance,

DaveO

 

Someone mentioned here on the forum in a recent Turbo vs SC thread that it's possible to put a larger pulley on the SC to get to your peak boost pressure sooner but limit it for the remainder of the RPM range by using a BOV (maybe two just to make sure?) to relieve the excess pressure. I don't know how reliable or do-able this is but it sounded like an interesting idea. It might mess with the MAF's reading venting off air it already metered though? *shrug*

 

wastegate actually not a bov

 

What everyone else said about the Torque Converters

Also, a good set of headers will give you gains in low end (not peak) torque and minimal gains in peak horsepower.

Shameless plug for Crawford Z Car service... before I added the Vortech to my car, I had a dyno-verified a gain with these headers of around 20-25ftlbs of torque on average in the low to mid-RPM ranges...

 

Oh... one other thing you can do is play with your timing at lower RPMs... if you have no experience with this, get someone who does to help you.

Basically, you can program the split second box for more advanced timing down low and back it off more rapidly as your RPMs rise in order to maintain your current upper RPM settings. The greater advance down low should allow you to eek out a few more ftlbs of torque.

Note that your tuning shop may have already optimized for this though...

 

mcduck...have you advanced the timing down low on your SS box ? From what I understand in the timing map...any number there or number you enter into it is going to be timing retard .I dont think I even seen any numbers on the map down low..I think it was blank until you got up in the rpm range . You got me thinking now....can you verify this....tell me more