How was the airbox modified? Also, have you considered an "open air" intake like the HKS RS Kit or the Blitz or Popcharger? Honestly, you should be going with ITBs since you have an ECU and all that good stuff.

 

I would get a Crawford upper intake plenum on that asap, I bet you'd be over 300rwhp easy. Heck, i'd even do test pipes (not sure if you have done those yet), you would probably be close to around 320rwhp after those two mods.

 

Have you guys ever thought of doing the "old school muscle car way" of stroking the motor. A lot cheaper to go this route than the AEBS kit.

Here's a possible set up:
Sleeve the block using Darton MID sleeves. This will allow a bore increase of up to 100mm. This is roughly a 4.5mm increase over stock bore.

Offset grind the stock crank by 2mm which would change the crank throw from 40.625mm to 42.625. This changes the overall stroke from the stock 81.25mm to 85.25mm.

You can then have the rod journals spray welded and machined down to fit small block chevy rods. The reason for the SBC rods is availability, a saturated market of any style you can think of and PRICE.. Keep in mind the rod to stroke ratio when choosing the length. Stock R / S ratio is 1.77to1. Using a 5.7" SBC rod and your new stroke brings the R / S ratio down to 1.7to1 (nothing to worry about as u don't want to go below 1.55to1 on any motor).

Of course with the longer stroke and rod length, your compression height will change. So along with your custom made 100mm pistons you'll also have to move the pin height up and choose compression ratio 11.5 - 12 to 1.

You source everything right and you'll come out cheaper than just buying the AEBS stroker MINUS machine work.. The above set-up would bump displacement up to 4.0 litres.

 

AHA! This is precisely what this thread needs...some original thought. First time I've seen the idea of using parts from a SBC in our cars, not sure about it, but definitely glad to see this type of initiative being put forth. atlsupdawg#2- if we still had those point things, you'd definitely get one.

 

The airbox needed to be modified to accommandate larger bell mouth (84mm bore)... so it needed to be cut wider and stick the bell mouth with some silicone rubber on to it. we were thinking about opening another front inlet (just at the side of the original inlet), but didn't go through it as it is really not needed...

I never considered the open air intake like the pop charger though... because I believe they will do the same thing anyway compare to the larger bell mouth and going to ITBs will be the pain in the bump again since it will be harder to get the car tuned up I reckon...


REDNESS:

No.... I didn't bore the throttle body...

cheers,

richie

 

I am thinking about the plenum too... but would like to wait for the EVO one though... or probably a plenum spacer might be a good mod at this stage...

I have got crawford hi flow cats now... and it is legal to run test pipes down under... the fine can be up to 10K AUD.... so I don't think I will do that though since it is my daily and it will never be a pure track car in the future!

Also found out that with this intake... and comparing the new dyno curve with the old one... lost around 10 lb/ft and 6rwKW (8rwHP) at around 4500rpm... this might mean something to anyone?! We will look into the cam timing/angle the week after next week and see how it goes!

Thanks for the advice mate!

cheers,

richie

 

If you are not going with ITBs you are smart in choosing the 350EVO setup, or at least waiting for it, it should be damn good but who knows it may not live up to the hype. I like the fact that it was created for an NA motor and nothing else so it should post nice gains.

 

Oh and one more thing, I was wondering if anyone knew a quality, perferrably actively involved in professional racing, manufacturer that could produce a custom set of long tube headers for the Z? I know about XERD but I think a better product could be made, albeit at a higher price.

 

But still...300 whp vs 295 whp is not a big difference in power no matter what conditions. If i'm correct he ran on a Dynojet. Concidering temperatures in Puerto Rico may be higher than in Australia ? I'm not sure. Remember i mentioned this guy had much less aggressive camshafts and NO standalone. No matter what..It's not a big difference in power #'s. Exactly what temp/humidity/dyno did you run the car on?

Give you props on hitting 300whp anyways! I can imagine how fun it is to drive.

 

FYI....got this from another thread in this forum. For those of you who don't know VandyZ is with crawford. Hate burst your n/a bubble.

 

If you could pay JBA to do a Nissan car, i'd do that. They have worked on the Titan (one of the few import vehicles they will work on). Really great LTs and they have the ability to make it in any material you want (they sell titanium, SS, ceramic, etc. headers).

 

I just emailed JBA:

Dear JBA Represetative:

I am a proud owner of a Nissan 350Z, and a member of the my350.com forums. Many forum members are interested in a quality long tube header for naturally aspirated 350Zs and my search led me here. I was hoping you could consider the lucrative 350Z market in your future production plans. At the very least I was hoping you could design a custom set for my Z. Please contact me as soon as possible if you can help me out.

Best Regards,

Reav.

So we will see what they say. I know now my next upgrade will be wider wheels and sticky rubber so depending on pricing I may haveta hold off on any performance upgrades for awhile.

 

Welp I got a email back from Tommy Kaira. Ummm not to promising for the 350-400Whp goal were looking to get.

Email from Tommy Kaira.

Luke,

Sorry for the untimely response of this email. I am one of the few here that are able to speak English well.

We are really not able to help you on your venture into the goal you are looking for. Shipping a motor back and forth will cost you more then the car is worth in the long run if you do not have a manufacture to tune your car for you. Below I have wrote you some information on the car.

The Nissan 350z is a car that not many aftermarket manufacturers and R&D teams have taken the time to explore. Your 400ps at the wheels goal is a hard route to take due to the lack of parts. The 350Z we sell have saw on the upwards of 310-320ps at wheels, but normally are around 300-305ps. With more time and research this number you are looking for will be possible with 91oc.

Sorry we are unable to help you but hope that you will reach your goal. Thank you for your inquiry.

Saun Majowti
Tommy Kaira Inc.
Enterprise Research/Devel




Here at Tommy Kaira the customers satisfaction is our number one prioriety.

 

Lukesnyder,
why dont you have a GrandAM Cup spec motor built for the car? Yes, your not going to get 400rwhp, but aprox 380hp at the crank is pretty damn good. Also they are using the stock crank, and heads on these motors and not the Nimso heads, valvetrain kit, and crank. I would imagine if you used these parts combined with a good GrandAm Cup spec engine build you would easily be over 400hp at the crank and you could use 91 octane

 

That sounds like a good idea especially considering your lofty HP goals. Honestly, I think around 300-320whp NA with a new final drive, and lighter clutch would be plently of punch for daily driving and awesome to track.

 

but how much si that!?

 

I forgot to post the letter from JBA but they basically told me we have no plans on making a header for the 350Z... blah blah... good luck. Not many long tube options out there. I am considering contacting supersprint and seeing what they can do.

 

Figure aprox $10-12k for the engine, if you go with standalone engine management, figure another $8k for Motec...

 

I'd just get the MoTeC M600 from Nizpro in Au (only $5k).

 

So basically after days and weeks of research.... I came up with this.....

If you have over 30-40k to invest into the car for testing, tuning and fabrication of parts... then you should do it. There are not enough parts yet to get the HP ratings that everyone wants.

Like what has been said above with me arguing that a fully built motor (trying to achieve around 350wHP NA) would be cheaper then a built block with TT setup.. I appologize I was totally wrong.... Give it another two years then we can argue this again. But as Tommy Kaira said "There isn't enought R&D going into these cars". The resources just arent out there yet to make this cost effective.

Lets just keep this in mind.... You can spend 4k , have a stage one Stillen installed and have 305whp w/o any other mods. It would take around 15-20k to achieve that NA... Which has supposedly been done by one member on this site.

For now it isnt worth the time. Plain and simple... Unless you would like to have a Z with 80k invested..