2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Need torque

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Old Oct 23, 2005 | 04:52 PM
  #1  
GodSquadMandrake's Avatar
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From: Minneapolis, MN
Need torque

How can I get more low RPM torque out of my 86 N/A? It's so gutless that it takes careful planning when overtaking cars on the highway, or trying to accelerate from a dead stop. I'm used to my 88 Jetta with the 8 valve 4 cylinder. It's the base model engine, but it's so much more fun to drive because it has torque available at all rpm ranges.

I know the RX7 is more of a performance and sports car so it's not going to be as user friendly or easy, but is there any way that I can get the engine to have more *****?

I'm guessing a supercharger is the only way to really do it right. Let me know if i'm wrong.
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Old Oct 23, 2005 | 05:02 PM
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go do a LS swap if you want a bunch of tourque kid
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Old Oct 23, 2005 | 05:07 PM
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hmm if your having trouble taking off from a stop then there is probably something wrong?...are your aux ports working correct?
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Old Oct 23, 2005 | 05:10 PM
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Bongolio
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oh and about having ball's with my mods i frequently outrun my buddies stock gst-eclipse!Or howabout raping a spec-v from a dig!
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Old Oct 23, 2005 | 06:30 PM
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3rd Rotor
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Old Oct 23, 2005 | 06:37 PM
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you just don't know how to drive your 7 i guess. . . If your jetta is more fun to drive than your 7 something is fucked up.
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Old Oct 24, 2005 | 03:15 PM
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Since you have that interesting RPM activated ports system, check and make sure the actuators aren't stuck in the 'down' position, and that they do move when you rev the engine. That will severly limit your low-end torque. When I took a look at them the other day, I though I saw them up, but i'm not sure.

Matt
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Old Oct 24, 2005 | 03:29 PM
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Turbo Tranny has lower gear ratios which would help with acceleration.
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Old Oct 24, 2005 | 03:45 PM
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One word. Naaaaawwwwwssss
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Old Oct 24, 2005 | 03:48 PM
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We're assuming that's a 5 speed stickshift.

Dyno the car and post the results. If you're rated at 160HP, you should expect 136 Rear Wheel Horsepower. If you're rated at 140hp, you should expect 120 Rear Wheel Horsepower.

Full upgrades to intake, full exhaust (headers, midpipe, catback), and a Racing Catalytic Converter will make a HUGE difference assuming your car is running properly.
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Old Oct 24, 2005 | 03:51 PM
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Just what RPM band are you trying to pass in? I usually use 4th, and every once in a while i'll hit 3rd if I'm really trying to do it in a hurry, but there's never usually any problem getting it done.
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Old Oct 24, 2005 | 03:53 PM
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Check your compression.... The car is almost 20 years old. Cheapest mod... J-spec t2 swap.... about $1400 in total investment...
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Old Oct 24, 2005 | 04:16 PM
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im sorry about this you guys i like the rotory also but put a v8 in it you will have more torgue and ponys then you'll know what to do with.
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Old Oct 24, 2005 | 05:06 PM
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Something is wrong with your car. I too had a MkII Jetta before getting a 7, and the 7 is better in every aspect than the Jetta.
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Old Oct 24, 2005 | 05:10 PM
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wtf is this question asked a lot or what!??!?!

two easy options-

1) change your rear ends final drive / ring gear to a higher number so you have more power at lower speeds.

2) increase displacement... the LS1 v8 swap is common and a modern alternative to the rare and expensive 20b swap.
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Old Oct 24, 2005 | 05:17 PM
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Originally Posted by idsigloo
Turbo Tranny has lower gear ratios which would help with acceleration.


the gear ratios are so close though i don't see it making any difference except in 5th where the NA ratio is rediculous. trying to pass in 5th would be more rediculous though...

edit: you could always look for a gtus rear end, 4.3:1 instead of 4.1:1

Last edited by bingoboy; Oct 24, 2005 at 05:37 PM.
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Old Oct 24, 2005 | 05:29 PM
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.

Last edited by bingoboy; Oct 24, 2005 at 05:37 PM.
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Old Oct 24, 2005 | 08:25 PM
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Originally Posted by idsigloo
Turbo Tranny has lower gear ratios which would help with acceleration.
No it doesn't.

The rear end ratios are the same also (except for the verts, auto's, or GTUs).
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Old Oct 24, 2005 | 08:56 PM
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No it doesn't.


Look under transmissions. It looks to me that the the Turbo tranny has shorter gears. I noticed it as well when I drove my buddy's T2.

Anyway, I think his car is not running right or he's trying to pass in 5th gear. Make sure the auxilary ports aren't stuck open. Mine are wired open right now (until I finally get this electronic 6PI working) and I notice it definately sucks in 5th gear compared to when they are closed.

Last edited by arghx; Oct 24, 2005 at 09:05 PM.
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Old Oct 31, 2005 | 12:09 PM
  #20  
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Originally Posted by Jager
No it doesn't.

The rear end ratios are the same also (except for the verts, auto's, or GTUs).
um, idsigloo is right, he mentioned the TRANNY has different ratios and its true.
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Old Oct 31, 2005 | 01:54 PM
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Your series 4 actuators pull to open, and only under high load.
To test them, run a tube to the actuator, T in a pressure gauge and blow into the tube to check at what pressure they open.
(A cheap boost gauge will do.)
Then reconnect the pressure tube & T in a long tube to inside the cabin, with the gauge on the end, and do a test drive to see when they open.
You want the to start opening at about 3500, and be fully open at ~4K.

When they stick, it's usually the shaft & not the internal sleeves.
Just work in some penetrating oil where the shaft goes into the LIM.
To see the performance difference, I T’d a “mity-vac” hand pump in the tube near the guage, then did some low end 3rd gear pulls from 1500 to 3500 rpm. The low end time was about 2 seconds faster with the ports closed.

Last edited by SureShot; Oct 31, 2005 at 02:14 PM.
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