-7/9s Or -5s Garretts

[34GeeTeeTee]

It is coming from the man who got more power for less lag

And while on topic, with a 3inch quiet exhaust system which i would assume is restrictive

[Piggaz]

We are talking about -5s on a built and cammed 26 not rs's that won't be at their peak at 4k.

I was using that as an example mate.

[XGTRX]

The only GTR I have driven is mine. Which previously was stock with computer and cat back. So with out first hand experience it's a little hard to judge what I would like

Go for a drive in different setups that your engine builder has done, see what you like and get him to build it. Best way to do it hands down and don't rely on other people's opinions on drivability and lag...your opinion is the only one that counts. Edited May 29, 2013 by XGTRX

[sydking]

I went -9s on a 2.6 - More then happy! Bit dicey running RWD at the moment too!

[Marko R1]

Your 2.6ltr setup sounds aligned to my liking. I had a 2.6ltr with -5s but I didn't get to keep it long enough to have my tuner remap it...although it felt strong at 347kw on 19psi.

Do u know what cams your engine is running out of curiosity? Any additional porting?

Anyway we are getting into the old forum fight of the definition of laggy setup. Each to their own on this one. I think the best advice is experiencing different setups to see what your happy with. Me personally love the built, cammed, -5 RB26 Setup. Best of both worlds and as my engine builder said, 'the 26s sweet spot'. I drive it daily and love that it's off boost in traffic and starts coming on at a higher rev range. I would hate boost coming on too early. BUT when I want to drive the car then I hold it between 4 and 7-8 and she is a rocket and no lag when it matters. My other car is a HSV LS2 with old school lumpiness and a hi stall. Again in traffic she purrs under stall with low torque to the wheels but when asked to she will flash to 4k and all hell will break loose. Best of both world with both Setups in my opinion.

[XGTRX]

Sorry mate can't help you much with the specs. All I know is that they were match ported to the plenum and exhaust manifold, and the engine builder modifies the head someway. The cams he uses he said is his own grind. Sorry mate. All I did was experience a few different setups and then said build me that one... which he did.

[Marko R1]

Fair enough mate, another Colonel Sanders build (only joking)

Who is your engine builder and tuner? If u prefer, pm me

[XGTRX]

Are you in Melbourne?

[Marko R1]

Sydney sorry

[bigmikespec]

That's the reason why some tuners are against 4in zorst with low mounts because you may loose torque and hence loose response as well.

Wow

[Ants]

Wow

easy to criticise is in it mate - on the other hand no one has come with any / provided me with any real evidence to convince me otherwise i.e.back to back testing to determine if this is accurate or just a myth.

Edited May 29, 2013 by Ants

[XGTRX]

Hey mate I don't think it's a criticism it just against all the theory.

And it's not a myth it gets put into practice everyday.

Edited May 30, 2013 by XGTRX

[Ants]

Hey mate I don't think it's a criticism it just against all the theory.

And it's not a myth it gets put into practice everyday.

still no evidence - and I'm going stop here with this debate because this thread is not designed for this type of discussion.

[Marko R1]

As an extension to wanting to get exhaust gases out as fast as possible, are there proven advantages around tuned length front pipes?

I often use the Gibson gtr as a benchmark hence did this car run straight front pipes or tuned length?

[scotty nm35]

3 inch un-tuned side pipes.

Get it out as fast as possible.

Sorry I don't have any pics of the exhaust on the GIO car, I only took engine bay shots when I was working on it... Next time, just for you guys.

[XGTRX]

Fair enough. But out of interest why do you think you need back pressure in the exhaust system to assist in torque in FI?

[Piggaz]

3 inch un-tuned side pipes.

Get it out as fast as possible.

Would not having the gasses merging back into a single pipe have any effect on this like 98% of low mount GTR's out there are?

In regards to the "tuned length" debate, wouldn't the gas pulses be all messed up after going through the turbine wheel?

[scotty nm35]

Would not having the gasses merging back into a single pipe have any effect on this like 98% of low mount GTR's out there are?

In regards to the "tuned length" debate, wouldn't the gas pulses be all messed up after going through the turbine wheel?

Pulses merging at a funnel and accelerating can promote a low pressure hole for the next pulse, but as Piggaz said, the turbine will chop the pulses to hell and the housing will smooth the pulses out due to it's restriction imo.

[XGTRX]

3 inch un-tuned side pipes.

 

Get it out as fast as possible.

Would not having the gasses merging back into a single pipe have any effect on this like 98% of low mount GTR's out there are?

In regards to the "tuned length" debate, wouldn't the gas pulses be all messed up after going through the turbine wheel?

If you mean scavenging the exhaust pulse, that only really is noticeable in small NA engines for the average guy. that's why if you speak to any RB engine builder he will recommend a pipe diameter for a certain power/torque/displacement/turbo setup to get the gasses out as quickly as possible.

[bigmikespec]

easy to criticise is in it mate - on the other hand no one has come with any / provided me with any real evidence to convince me otherwise i.e.back to back testing to determine if this is accurate or just a myth.

Instead of waiting for someone probably best you do some reading to figure it out like most others have or talk to someone who really knows what they are talking about.

It is even easier to sit back and demand someone provide evidence (for what is a fact) to satisfy someones skepticism.