how can i create more torque with my 87 rx7 turbo?? thanks alot..

 

Well, what mods do you have on it now?

You can create more torque (with a new turbo, etc.) but that is usually for the upper end of the rpm range or when the turbo has finally spooled up to its max psi.

Increasing "low" end torque is a different story and is not as easy on 13B's. That is why we have 20B and V8 RX7 guys...

 

A supercharger would give you more torque, but I doubt you would want to swap out your whole turbo setup.

 

Increase your BMEP.

You can also increase "road torque" by installing a Turbo II differential 4.33 ring and pinion gear set (different than the non-turbo set), available from Mazdaspeed and their retailers.

 

if you wanted torque you shouldn't have bought a rotary. No matter what you do (aside from an SC) the low end torque will suck.

 

Low end TQ suck...I think not. We might not have some crazy number in the TQ department or HP department, BUT...our power is over a flat line instead of some peaky piston engine. I'll take that over a bigger number anyday.

As far as TQ is concerned, I'd say I'm with Evil on this one, also the more velocity you have the more TQ you could get, but the less peak power you could get. Smaller piping and all those types of things help too, but it's a trade off...Just like everything else...

 

really?

I find my car to be pretty damn torquey anywhere above 2000 RPM.

Below 2000 is iffy, and below 1500 .. well, I dont' see how it has enough torque to run...

But come on, it's a 1.3. Above 2000 RPM though, is pretty damn good.

To increase torque (mid and high) you need to open up the exhaust, intake, up the boost, etc.

A good tune up and a new set of plugs will work wonders too.....

As far as low end goes.. a tune up.. or a v8. Not much can be done, really, aside from adding displacement.

 

whats BMEP??

 

"Bring More Entrance Pattycake" or thats what I heard from the voices.

TQ == hard to find with a small displacement engine. Even when your Rotary.

 

Brake Mean Exhaust Pressure. It's a measure of the force the combustion gasses are exerting on the cylinder (rotor, in this case). The higher the pressure, the more angular force is exerted on the eccentric shaft, and thus the more torque you'll make.

Evil forgot the best way to add torque, however - add displacement.

BTW, turbos don't "spin up to max psi" at redline. That's a centrifugal supercharger. A well-sized turbocharger will make peak boost just as quickly (if not more quickly) than anything but a roots supercharger (efficiency concerns aside).

Brandon
BR7 Racing

 

TID mod added so much around 3000-3500

 

Also, if you have the wastegate mods to handle it a HUGE exhaust makes great gains in low end torque due to the fact that the turbo spools so easily and there is less backpressure for the rotor to fight in its long rotary exhaust stroke.

My TII has a 3 1/2" turbo back on a 60-1 hybrid turbo w/ T4 "O" trim exhaust wheel clipped 15 deg (and INSANE WG mods, needing/getting more).

I generally cruise around town between 1,000-1500 RPM and it pulls smoothly and effortlessly from this RPM. If I am on a fairly steep grade I have to keep it above 1500 RPM. Oh, this is w/ 11# alum flywheel. This is all 7-12% throttle position, definitely not lugging it. If you do give it more throttle it is boosting .1KG/MM by 1500rpm.

BTW, the wastegate mods needed for this are much more than porting the WG. You must divide the WG from turbo exhaust and put a large external WG on the turbo backplate.

 

Brake Mean Effective Pressure, actually.

RX7freak87, What I am basically trying to say is that just about anything that increases the combustion pressure in the engine will tend to increase torque. This includes a tune-up (timing, spark plugs, plug wires, etc.), forced induction (turbos and superchargers), cold air inlets, nitrous oxide, etc. If you mean "low end torque" as opposed to peak torque or torque across the power band, then there are some cases where you must choose between torque and horsepower, such as with the exhaust, intake, and engine porting.

Dan H already covered that option

 

 

my low end (between 2000-3000 basically) torque and response increased very noticeably with a s5 exhaust housing and manifold. for torque above that, raise boost.