Er34 Gtt Nismo Muffler And Impul Ecu

[O_Sotiris]

Hi all,

At the moment my car has few mods being as follows:

1. blitz return flow cooler

2. K&N drop in panel filter

3. Excedy HD clutch

4. boosted 1 bar

It also came with an Impul tuned ECU and Nismo VSS muffler.

After searching for what type of exhaust I will need etc, I have decided to change the exhaust system to a 3". However, I want to keep the Nismo muffler, and change the dump/front/cat-back (if that can be done with the VSS).

Does anyone know if the VSS muffler (silent/sports mode) is particularly restrictive? Or whether it would even matter as its at the end of the exhaust?

If people dont know the muffler i'm talking about it can be found here:

http://www.skylinesa..._1#entry5322488

and here:

http://www.skylinesa..._1#entry2851890

Also, once I have changed the exhaust the car will most likely need a tune. Does anyone know if the Impul chip can be tuned? I am pretty sure the car came with both the chip and muffler from factory.

Thanks for your help in advance.

Edited October 14, 2011 by O_Sotiris

[GTXR34]

r u after the sotck look or the just the adjustable valve? if u dnt care abt loosin the stock look jsut get a varex cannon with the adjustable valve or if u want the stock look just take it to an exhaust shop and they will make an adapter for the tip..

i personaly rekon it will be a restrictive due to the 2.5" inlet.. u could get a twin varex tip to look similar aswell.. and even rewire it to the vss switch or just use the remote provided.. the varex is exactly the same system as the nismo one.. hope that helps

Cheers

Herb

[R31Nismoid]

Better off with a legal exhaust than one that is illegal (valve based) given you are in Vic.

There are a few 3inch items that do pass EPA for when you get pinned.

You will need a prope tune as well. I feel sorry for your car being forced with that boost on a shit stock dia exhaust, can't be good at all.

[GTScotT]

I actually feel the jap tuned ECU's can be quite good and wouldnt go as far as to say 'need a proper tune'.

The jap ones are normally done around factory based cars with typical mods such as exhaust cooler and boost. But I am a firm believer you should always run them up on the dyno to make sure they are doing what they hope they are.

The variance in fuel between the two countries CAN throw them off completely and leave you detonating the shit out of your motor. No guarantees unless you get it checked!

[whitneybra]

Hi im currently running the same nismo vss muffler at the end of a 3 inch pipe with the valve removed.

I have a 3071r with AVO rear housing. plus supporting mods and im achiving 274hp at wheels on 9 psi.

Im yet to turn the boost up.

[O_Sotiris]

Thanks for the help/opinions guys.

@GTXR34 & R31NISMOID

I like the idea that the car came from factory with the Nismo muffler and the switch in the cabin is a good talking point! Obviously though if it is doing damage i'm not keeping it on. To tell you the truth I never realised it was only a Nismo muffler. I actually thought it was the whole exhaust which is why I haven't upgraded it.

You will need a prope tune as well. I feel sorry for your car being forced with that boost on a shit stock dia exhaust, can't be good at all.

Can the smaller exhaust really be doing doing damage? Will too much backpressure wreck the turbo?

I'm only asking because the car came like that from Japan. Only modifications I have made are the cooler/intake/clutch.

I actually feel the jap tuned ECU's can be quite good and wouldnt go as far as to say 'need a proper tune'.

The car hasn't detonated in the time (almost 2 years) I have had it. It's actually been running a little bit rich, even with the modifications.

Hi im currently running the same nismo vss muffler at the end of a 3 inch pipe with the valve removed.

Do you need some sort of adapter to go from 3" to 2.5" at the muffler?

[whitneybra]

I made the whole exhaust myself and did a 3 inch to twin 2.25 to use both imput hole in the muffler.

It was a bit of stuffing round but hasnt hurt the power at this low boost i will find out if it does when i get a final tune done.

[KiwiRS4T]

I think you'll find the impul ecu cannot be tuned but you may be able to replace the chip - ask someone like Toshi - he may be able to do it but you really want it done in your car not by mail.

But if you can stick it on a dyno after you have made the changes - if you're lucky and afrs and timing are acceptable you won't need a retune at this point.