Thinking Of Going Back To Twins

[arsnic_apple]

Currently my setup is as follows:

RB26 - standard bottom end

Tomei type b cams

3inch exhaust

GT3582R 19psi

and all the other bits and pieces to go with it

Now i made 510rwhp, my tuner took the torque figure because he sais it was pretty useless.

From others graphs Ive seen with the same turbo the torque has been around the 500 mark.

My question is, if i change back to say -5's and put my car on e85 will i make the same power but heaps more torque?

Most -5 setups Ive been seeing are all 700+ with some making just over 1000 with around the same 500hp figure

And then have the other obvious advantages like legality.

The car is a street car but I would like to get into a track day here and there and would really just like to get the most out of it.

No point having the high mount single when i could have better results with the twins and still look legal under the bonnet.

Am i on the right track?

[Dale FZ1]

Go do a few track days without changing anything.

The car will have far more speed than you can extract out of yourself.

[Chris32R]

Go do a few track days without changing anything.

The car will have far more speed than you can extract out of yourself.

+1.

I never realised how much my car outperformed my driving skills on a track until I actually got out and started doing laps. No point making upgrades if you are the weakest link.

As for going back to twins, I would keep the GT35R you have on there now unless you're seriously concerned about copping a defect. The difference between -5s and a GT35R would be very minimal.

[34GeeTeeTee]

+1.

I never realised how much my car outperformed my driving skills on a track until I actually got out and started doing laps. No point making upgrades if you are the weakest link.

As for going back to twins, I would keep the GT35R you have on there now unless you're seriously concerned about copping a defect. The difference between -5s and a GT35R would be very minimal.

Or if you are concerned about your result swap it out for a HTA3582 or GTX3582 and lean on it and you will make more than you could ever need...

But as the other guys said, its just a number... The car by rights should be bloody quick as it is so there is no point spending all that time and money going back to low mounts.

[Blackkers]

i just want to mention that reading torque from a dyno graph is absolutely useless unless it's an engine dyno.

don't compare your torque figures to other peoples, it doesn't make sense to do so.

torque changes with leverage so using a different gear or even different size wheels will yield a different result. It is also possible to get much more torque at the wheels than at the engine (unlike power). so forget about it!

if you really want to upgrade your turbo look at what Matt said. My choice would be the HTA3582. It will be more responsive and have more top end than your current turbo

[Lithium]

Why is it running "only" 19psi? The torque figure is largely going to be from the engine VE and boost level, all other things being equal. If you have a good exhaust manifold and tune then psi for psi the GT35R should be more or less capable of matching or bettering your typical -5 setup - at least until you start maxing it out (-5s probably have a slight peak flow potential).

Sorting out the tune and raising the boost should see more to be had, any lack of torque isn't indicative of that turbo's potential - especially at that boost level.

[France]

i just want to mention that reading torque from a dyno graph is absolutely useless unless it's an engine dyno.

don't compare your torque figures to other peoples, it doesn't make sense to do so.

torque changes with leverage so using a different gear or even different size wheels will yield a different result. It is also possible to get much more torque at the wheels than at the engine (unlike power). so forget about it!

if you really want to upgrade your turbo look at what Matt said. My choice would be the HTA3582. It will be more responsive and have more top end than your current turbo

+1

Torque figures on a standard dyno is meaningless

[scotty nm35]

They have plenty of meaning, that is how they tune for maximum best torque. As long as no variables are changed then torque output is a critical component of seeing the performance gains of mods.

Of course comparing torque figures between dyno's is gayer than comparing dicks.

[Blackkers]

They have plenty of meaning, that is how they tune for maximum best torque. As long as no variables are changed then torque output is a critical component of seeing the performance gains of mods.

Of course comparing torque figures between dyno's is gayer than comparing dicks.

yes of course but the numbers are arbitrary

[scotty nm35]

yes of course but the numbers are arbitrary

Not on a hub dyno, if the gear ratio is entered correctly...

[KiwiRS4T]

Here's my torque curve from a 3582R on a hub dyno - not as many hp as the OP but a reasonably steep curve (albeit with an extra 400cc):