SARD ITB (4 Throttle) News!

[fika84]

Totally worth it. Absolutely on my na build list!

[x808drifter]

Originally Posted by mav1178

I brought up the RB26DETT because it's a factory car. Boosted or not, the engine revs to 7500 so it's ESPECIALLY relevant in the RPM range you listed.

Tell me, what was Nissan's reasoning for including this on the RB26DETT but not have it on the RB25DET?

I wasn't trying to compare gains from an ITB setup on a 2.0L FA20 to the factory ITB setup on a 2.6L RB26DETT. I was merely pointing out that it doesn't take 8500RPMs for there to be some type of benefit from ITBs.

Whether the gains are worth the price paid is up to the end user, which is not 99% of people wanting to mod the FA20.

I believe the point he's trying to make is that you are comparing two VERY different engines.
There are so many differences between the two it isn't really logical to even compare.
Straight 6 vs boxer.
There is sooo much more that determines weather or not ITB's/IRTB's will be worthwhile and where they will add power/response.
Just because its useful on one engine doesn't mean it's useful on another.

RPM has very little to do with it.
His original point was that most have figured out that there is very little to gain power wise below 8,500 the airflow restriction just isn't a factor below that RPM in our engines with the stock manifold.

His second point was since the engine doesn't like RPM above that 8,500 mark anyway its kind of a moot point.

I can see slightly better throttle response but not much beyond that.
Some minuscule gains here and there.

I think to get real gains the car would either need to be high revving (above 8,500) or have a bunch of boost being thrown down its throat to be worth the investment.
^ At least in my eyes.

Only way to really know is for someone to do it.

[gtengr]

Originally Posted by x808drifter

RPM has very little to do with it.
His original point was that most have figured out that there is very little to gain power wise below 8,500 the airflow restriction just isn't a factor below that RPM in our engines with the stock manifold.

I can see slightly better throttle response but not much beyond that.

Some minuscule gains here and there.

There's more to it than the ITBs. Notable plenum volume has been added.

[venturaII]

Originally Posted by x808drifter

Straight 6 vs boxer.
There is sooo much more that determines weather or not ITB's/IRTB's will be worthwhile and where they will add power/response.

And cylinder layout has absolutely zero to do with it.

[Tokay444]

Originally Posted by mav1178

I brought up the RB26DETT because it's a factory car. Boosted or not, the engine revs to 7500 so it's ESPECIALLY relevant in the RPM range you listed.

Tell me, what was Nissan's reasoning for including this on the RB26DETT but not have it on the RB25DET?

I wasn't trying to compare gains from an ITB setup on a 2.0L FA20 to the factory ITB setup on a 2.6L RB26DETT. I was merely pointing out that it doesn't take 8500RPMs for there to be some type of benefit from ITBs.

Whether the gains are worth the price paid is up to the end user, which is not 99% of people wanting to mod the FA20.

Their reasoning was they knew they could charge more for the rb26 than the 25.
And you’ve completely missed my point. Again. It doesn’t take 8500rpm for gains from an ITB, on a boosted car. Apples to oranges.

[mav1178]

Originally Posted by Tokay444

Their reasoning was they knew they could charge more for the rb26 than the 25.
And you’ve completely missed my point. Again. It doesn’t take 8500rpm for gains from an ITB, on a boosted car. Apples to oranges.

I didn't miss your point when you wrote "placebo effect" in your second post in this thread. I got it. No gains.

As for more money for RB26 than 25, that's a cute statement but that's not why the engine was built the way it was. The RB26 was essentially built to maximize the impact of the car/engine in FIA Group A competition. The engine displacement had a multiplier (1.7x) and with 2.6L the car would be able to run 11" wide tires with the vehicle minimum weight similar to other cars in the class.

This was a conscious decision as the R31 GTS-R was not very competitive in Group A.

But yes, it was to charge more for the RB26. Nice way of putting it.

[Cole]

Originally Posted by nikitopo

I wonder what the guys will say now, when they where questioning in the past that the stock throttle body is large enough and it does not create any restriction.

I wonder how much you're trying to justify your throttle body purchase at the moment.

[Spuds]

ITBs are good and all, but when are we going to get variable length runners?

[churchx]

Never?

[Kodename47]

Originally Posted by Spuds

ITBs are good and all, but when are we going to get variable length runners?

GRMN Intake Manifold?

[nikitopo]

Originally Posted by Cole

I wonder how much you're trying to justify your throttle body purchase at the moment.

I think with Cole will end up like this:

[Tokay444]

Originally Posted by mav1178

I didn't miss your point when you wrote "placebo effect" in your second post in this thread. I got it. No gains.

As for more money for RB26 than 25, that's a cute statement but that's not why the engine was built the way it was. The RB26 was essentially built to maximize the impact of the car/engine in FIA Group A competition. The engine displacement had a multiplier (1.7x) and with 2.6L the car would be able to run 11" wide tires with the vehicle minimum weight similar to other cars in the class.

This was a conscious decision as the R31 GTS-R was not very competitive in Group A.

But yes, it was to charge more for the RB26. Nice way of putting it.

I've effectively stopped reading your posts now.
They're so far from being on topic it's ridiculous.
We get it. You're a GTR fanboi.
Moving along.
inb4 no gains.

[Cole]

Originally Posted by nikitopo

I think with Cole will end up like this:

[IMG]http://i65.tinypic.com/m92hc1.jpg[/IG]

So if your stock TB was such a restriction, where's your before and after dyno proving all the power you made?

[D_Thissen]

Originally Posted by Cole

So if your stock TB was such a restriction, where's your before and after dyno proving all the power you made?

Are you saying that his butt dyno is incorrect??