NISMO exhaust

[SKiddell]

The essence of this thread centres on the development work that has been done in experimenting with secondary lengths and tuning the exhaust system in order to maximise power and torque. Most current setups have a tubular header coupled to a system that takes the gases out of the back of the car, job done....NO ....most of these systems don’t allow the engine to reach its full potential due to a number of issues.... for instance a truley tuned system helps gas speed/temperature to be maintained (rather than reduced) in order to use the combustion pulses to help extract the following cylinders waste gas and help the fresh charge enter the cylinder thus avoiding a polluted charge (scavenging) another is antireversion, avoiding reverse shock waves disturbing the pulse flow......think this is a new understanding of the way exhausts work....think again

Recently during a conversation, it came to light that in fact Dave Jarman (DJ road and Race) was one of the first people in the UK to play with, test and successfully use long secondary lengths. As early as 1988/89 Dave was doing dyno testing and having conversations with some of the premier race builders in the states who had experimented with and had success with, extended secondary lengths. Out of the back of these tests came his undeniably quick, Modsports car which made full use of this technology, plus a number of other successful setups in other competition cars.

So when ever we think we're doing something new ...... its worth taking the time to do a little research and sooner or later, more often than not we will find that someone has done it before....

 

[zedhead260]

I do have the possibility of shipping something in from Japan (header or system, or both), but at this moment in time I have no idea of cost................................................................... but I suspect budget will make it prohibitively expensive and I’ll end up with the NISMO item anyway.

As I suspected, a complete manifold & system would cost about £2k so it's out of the question, which is a shame - it'd have been nice to have something a bit different.

I think I'll keep my options open for a while - I don't need it right now, but I do want to keep it in mind and am open to more suggestions.

 

[samuri-240]

Dave Jarman has always been successful & always will be as he moves with the times, always was successful in his own cars & now prepares other successful race Z's. Most certainly the best L series engine builder/modified Z builder in the UK. Ordered my Nismo manifold from him, he is going to fit manifold & system soon. Ive been into Z's 20 years met Dave about 12 years ago he certainly knows his stuff. So for the best system for your requirements you should speak to Dave.

 

[zedhead260]

So for the best system for your requirements you should speak to Dave.

Thanks,

I speak with Dave regularly as he's doing my engine. We've discussed secondary lengths before, and am aware of his work in this area - the only thing is, he doesn't make them unless he has the car.

This thread was really about an "off the shelf" "developed" system which will save me a lot of aggro, even if it costs a little bit more (I'm still mulling over the idea of shipping from Japan).

 

[Albrecht]

This thread was really about an "off the shelf" "developed" system which will save me a lot of aggro, even if it costs a little bit more (I'm still mulling over the idea of shipping from Japan).

If you don't mind me asking, what Japanese system was it that you priced up at £2k ( landed in UK, with all taxes paid I presume? )?

I'm shipping some stuff from Japan in the next couple of weeks or so ( via Air ) and might be able to offer you some space, if you are interested.

Let me know.

 

[zedhead260]

If you don't mind me asking, what Japanese system was it that you priced up at £2k ( landed in UK, with all taxes paid I presume? )?

I'm shipping some stuff from Japan in the next couple of weeks or so ( via Air ) and might be able to offer you some space, if you are interested.

Let me know.

Well, we were talking ball park really - didn't go into the full detail as it just looked too pricey. It was the Kameari catalogue being thumbed.

I am interested; will drop you a PM.

Thanks

 

[Russ]

Save your £2k and get a blower and force the exhaust gases out

 

[zedhead260]

I won't be spending that sort of money Russ, don't worry.

Changing to super-charged at this stage would cost more than £2k

 

[zedhead260]

You can see from the attached photo comparing the Kameari and NISMO header; you’ve got to admit, the Kameari item really looks the business and they do the remains of the system available off the shelf.

Well, I pretty much came to my decision to purchase the Kameari item – it’s something a bit different, saving me some aggravation with fitment etc, compliments other Kameari items on the car and doesn’t have the compromises of the (left hand drive configured) NISMO header.

However, despite the seduction, I couldn’t go ahead with it until I’d spoken with Dave Jarman. He’s building the engine, so he has to have the final say.

The answer is to stick with the NISMO header, take my car to him and get him to make the rest of the exhaust on the car. It’s not really what I wanted to hear, but as Dave pointed out – all of his engine development has been with the NISMO item, to change one thing could totally alter the engine characteristics. If the motor was built up but running down on expected power, Dave wouldn’t know where to start other than to change the exhaust.

The Kameari system may work with a DJR engine…………….but it may not, and it’s an expensive risk to be taking at this stage and I’m certainly not in the position to be paying for development work.


So NISMO it is then.













Followed by a big trailer towing drive to Dave’s.

Hey ho.

 

[Russ]

Can you pm me details of the Kameari system please and estimated price? I'm looking for a system sometime.

 

[moggy240]

the kamerai manifold looks similar to the one that black bug was selling

 

[samuri-240]

the kamerai manifold looks similar to the one that black bug was selling[/quote

Does'nt look very similar to me Mike

 

[moggy240]

your right !!!! but there are certain aspects which are similar, would you agree

 

[samuri-240]

Sorry I can't agree as I know nothing about exhaust manifolds. The Kamerai one just looks like a piece of art, why would they go to all that trouble if one that looks similar to a GDS does the same job. I'll leave it to the pro's, out of my depth here. I'm going the DJ Nismo route as thats what he recommends for my engine.

 

[zedhead260]

I understand that NISMO headers are no more.

The old boy who was making them has retired and that is that - finished !






















Good job I managed to get one

 

[Martin W]

iv spoke to GDS today and the answer i got from them was they no longer have the jig to make there header or system now so for not LOADS OF MONEY where do i go to get my header and system.

martin.

 

[SKiddell]

I think thats a very good question and one that faces all of us that are into long term ownership, even if we already have one.

I do know that Mike (MJP) can source Nismo "style" units from the USA they are manufactured by Stahl (very credible)

Fourways make units similar to Nismo ones, Grolls has one.

Other than that you (we) might have to look further east for units.

For those that have big wedges (£) then Simpsons will custom make one for you, as will Haywood and Scott.

 

[Nigel Brook]

I'm led to believe the "big" ( 1.75" primarys) nismo manifold is still available. Dont know about a system tho except they are also available in stainless for around 2.5k!

 

[Martin W]

hmmm not wanting to spend 2.5k on an exhaust really. going for a fairly low mod engine. cam maybe 2" su carbs but more like a 240 set, so i can drive it and not have to always be on the look out for petrol stations every 20mins. head work n skim 280 dizzy re build the bottom end nothing flash. so would like a nice looking well priced header and system that will allows for this and a little more and have a good tone to it. so the fourways 1 seems like a good start? i see MJP has a well priced header but its a 6 into 1 does anybody use this 1 from mike, is it ok for this sort of speck

martin

 

[zedhead260]

its a 6 into 1 does anybody use this 1 from mike, is it ok for this sort of speck

My personal experience -

I used Pipecraft when the car had its old engine. It was good quality mild steel which lasted for years and years. It sounded the nuts too.
It had a bad header on though (one of those 6 into 1’s) and never performed as well as the smaller diameter Janspeed which came before it, which just goes to show.