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Old 11-08-2004, 11:24 AM   #1
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Default How to increase TORQUE instead of HORSEPOWER?

I know the urge to bump up our HP figures borders on mania but lately I have been noticing some TQ losses when going for maximum horsepower gains. Since my Z will never see a track day and I don't race everybody on the drive home, I don't really need high RPM as much as I would like a little more torque down low. Most of the NA mods I have researched do a good job of adding power up top. Is this just the result of our engine having a modest displacement? Without going SC, are there any mods capable of positively affecting the low RPM torque in our cars?
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Old 11-08-2004, 11:41 AM   #2
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besides building a motor from the ground up?
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Old 11-08-2004, 11:51 AM   #3
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Yeah.
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Old 11-08-2004, 12:03 PM   #4
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If you wanted to keep TQ you shouldnt have gotten a true dual exhaust-should stayed with a Nismo or something similar. Test-pipes give a nice TQ increase in the mid-range tq they may lose a little bit down low with a trua dual exhaust dont know about with a Y-pipe. Not much you can really do, a crank pulley would help free some losses, besides that all you can do is raise the compression if you want to stay NA. If I wanted a "torquey" V-6 I would do a Nismo exhaust, test-pipes, Crawford headers (Which i always hear do great on the low and mid range TQ) and the 350 EVO gear set to get off the line quicker, and to have shorter gears. and a technosquare reflash to top it off. BTW, my technosquare reflash netted me 13 ft lbs of TQ more over my "untuned" mods combo.
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Old 11-08-2004, 12:15 PM   #5
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Default Torque increase

Quote:
Originally posted by Alberto
If you wanted to keep TQ you shouldnt have gotten a true dual exhaust-should stayed with a Nismo or something similar. Test-pipes give a nice TQ increase in the mid-range tq they may lose a little bit down low with a trua dual exhaust dont know about with a Y-pipe. Not much you can really do, a crank pulley would help free some losses, besides that all you can do is raise the compression if you want to stay NA. If I wanted a "torquey" V-6 I would do a Nismo exhaust, test-pipes, Crawford headers (Which i always hear do great on the low and mid range TQ) and the 350 EVO gear set to get off the line quicker, and to have shorter gears. and a technosquare reflash to top it off. BTW, my technosquare reflash netted me 13 ft lbs of TQ more over my "untuned" mods combo.
Alberto, where does the 13 ft.lbs. increase show up. Where do you notice it mostly? What gear/RPM. Thanks
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Old 11-08-2004, 12:38 PM   #6
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I considered the Nismo but couldn't really swing the extra $$. Plus, I came up on a good deal on the Borla. Do you have to send in your ECU for the Technosquare reflash? Apparently this gives some really good gains. How much is the reflash BTW?
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Old 11-08-2004, 01:09 PM   #7
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Quote:
Originally posted by BENJ-AMG
I considered the Nismo but couldn't really swing the extra $$. Plus, I came up on a good deal on the Borla. Do you have to send in your ECU for the Technosquare reflash? Apparently this gives some really good gains. How much is the reflash BTW?
I noticed that you have the 5AT. Try adding a high-stall torque converter. This will put you closer to the power peak of the engine. The 5AT already uses torque mulitiplication check with some of the TC manufacturers and see if you can get a TC with high multiplication. Just remember the more multiplication you get the less efficient your engine/transmission becomes.
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Old 11-08-2004, 01:38 PM   #8
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Crawford Headers! My Z dynoed 20 ftlbs higher on average from low to mid range RPMS... best NA mod I made before going with the Vortech!
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Old 11-08-2004, 02:11 PM   #9
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Quote:
Originally posted by mcduck
Crawford Headers! My Z dynoed 20 ftlbs higher on average from low to mid range RPMS... best NA mod I made before going with the Vortech!
Jebus, 20 ft lbs?!?? Wow...I have the Crawford HF cats and headers on my wish list already. I would pick em up soon but the headers are alot of $$$ to me at the moment. Good news is, they are right down the street
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Old 11-08-2004, 03:15 PM   #10
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1. NOS
2. Eaton supercharger
3. tiny turbo
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Old 11-08-2004, 03:28 PM   #11
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350evo 3.9 final drive
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Old 11-08-2004, 03:56 PM   #12
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I didn't know headers gave that much....has anyone else seen those gains?
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Old 11-08-2004, 05:43 PM   #13
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Quote:
Originally posted by bobS
I didn't know headers gave that much....has anyone else seen those gains?
Mike Edens (Mjedens) picked up 39-40 ft-lbs down low in replacing his NISMO headers with the Crawford headers...

Note he's running big 268s cams...
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Old 11-08-2004, 06:07 PM   #14
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350evo 3.9 final drive or Stillen SC
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Old 11-09-2004, 01:56 AM   #15
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eaton SC is your friend
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Old 11-09-2004, 06:09 AM   #16
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Default Re: Torque increase

Quote:
Originally posted by jpc350z
Alberto, where does the 13 ft.lbs. increase show up. Where do you notice it mostly? What gear/RPM. Thanks
I believe I picked that up at peak so that would be around 4800 rpm's. My TQ curve is amazingly flat, especially for having a dual exhaust. I love my Technosquare ECU, I would recommend it to anybody. BTW, I really love the 7200 rpm limiter, when I take 1st to that and grab second I fall to 5500 rpm's....2nd gear is over fast.
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Old 11-09-2004, 01:41 PM   #17
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gears=torque multiplication

lightweight flywheel
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Old 11-09-2004, 01:41 PM
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2004, 350, 350z, borla, dual, g37, gains, gears, headers, horsepower, increase, max, nismo, nissan, sc, stillen, torque



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