You just ran into your first problem. None of these piggybacks (AFAIK) can alter the rev limiter.

Your right, this was the same when I was researching for my last car. (Motec excluded)

Wonder if powerchip will give you a reflash for cheap just to get the rev limiter increased?

Murray

 

mchapman.
No I dont mean supercharged or turbocharged, but a complete new intake manifold system, new camshafts & hi flow cylinder heads.
The VQ35DE motor in full race mode & unrestricted is getting well over 500HP. The VQ30 with 38mm restrictors makes 380HP.

Apps
I made a mistake when I said Nizpro spent 15hrs on the dyno it was 15 DAYS

 

Now that's a lot of dyno time.

To be honest my opinion of Powerchip is that if and when they actually release a product it'll pretty much just be a timing bump. I believe they offer a 14 day money back guarantee. I'd love to see someone do a baseline, get this done the following day and then the day after do another dyno.

 

mchapman.
No I dont mean supercharged or turbocharged, but a complete new intake manifold system, new camshafts & hi flow cylinder heads.
The VQ35DE motor in full race mode & unrestricted is getting well over 500HP. The VQ30 with 38mm restrictors makes 380HP.


Nice numbers, im glad you mentioned them, are they at the fly numbers?

So if you want the VQ35 to rev to ~7500rpm reliably, again and again, you need to build up the bottom end as well. Or at this RPM is the standard bottom end up to it?

I dont think the standard valve train could handle though, I have been researching parts needed to get the top end to rev hard reliably. Maybe you could share some more info on this topic?

Murray

 

Peter...

Did you ever get an idea of the cost to rebuild the engine with all the right gear? For people like us which aren't in competition wouldn't it be more cost effective to go FI (twin turbo?)?

I mean some of those engines are well over 100 grand on their own!

 

mchapman
Revs makes HP or more acurately designed revs makes HP.
Formula 1 engines run 15000+ rpms. Honda 2000's 9000.

Our motor was built to a cost. The stock crankshaft,crankshaft girdle, ext is probably good for 8/8.5K.
The stock bigend bolt is the weak point. Nismo has included an uprated bolt in its new S1 release & lifted the rev limit to 7000.
Nissan Motorsport South Africa told me the stock rod was good for 7400 ( They build the Paris Dakar raid vehicles)
With forged rods & pistons this motor would run all day in the 8k range. But that would be no good with the present cams & intake. Re engineer these and the motor could be a reliable 250 to 280Kw motor.(The std valve train is beautifully engieered)
As a 1 off very expensive but iff Nissan did it maybe less than $5K, but then the G,box , Diff ,wheels,tyres & brakes would have to be uprated to maintain the reliabilty that a manufacturer has to maintain. Pretty soon you have got a $90K Z & how many people would pay that for a Nissan?

Zuff
These motors in VQ30 form have been around for a while & are used in a suprisingly lot off race cars, ALMS, Telefonica Nissan, Le Mans, Pilbeam Hillclimb cars.
And in VQ35DE form in Formula Renault V6, Fran AM, Paris Daker & other off road series,
The IES built motor for LeMans & ALMS is a 50,000 Pounds motor

So the answer to you ? is yes, Forced Induction is going to give you the most bang for your $. But the better engineered kits still aint going to be cheap

 

So it sounds that for a street driven motor it wouldn't be too difficult or costly (relatively speaking) to get something that would be happy to run up to about 7900? I know it'd be a case of deminishing returns without the intake changes but it's interesting nonetheless.

 

Revs makes HP or more acurately designed revs makes HP.
Formula 1 engines run 15000+ rpms. Honda 2000's 9000.

Im down with this logic, but I don't want to my low rpm to suffer too much. So a careful trade off it necessary here. I think moving the peak power and rev limit towards ~7,400rpm(based on your info), new bigend bolt + all the mods I already had planned(intake manifold, complete exhaust, cams, maybe some upgrade to the cooling system for heat generated by the extra fricton from pistons on the cylinder walls), I can get away without the fordged bottom end?
I should also still have 'ok' low rpm pull. Plus my power should be at a nice level as a result of these upgrades.

If a rod fails, the kind of damage created from that, is it isolated to the rods, or would that probabally kill quite a few other components as well? I ask because if the damage will kill alot, i may consider going forgded from the beginning to be safe.

Thanks for this valuable info.

 

You musn't have seen a rod failure before. I'll see if I can find some pics.

EDIT: here you go. This actually looks like a rod bolt has let go rather than the more typical rod failure but the effect is the same. It's a Nissan engine just for fun.

http://imagestore.ugbox.net/images.p...1856687d161f0f

http://imagestore.ugbox.net/images.p...f212daa8d5b4e5

 

Hmmm...

Ok thats pretty bad. I might set the rev limiter to 7300rpm then

Thanks for the pic.

My Celica engine had a hole about that size when it died. I wonder if thats what happened? (Rhetorical)

Regarding the stock ECU:

https://my350z.com/forum/showthread....threadid=59056

This is without anyone touching the ECU, this is exactly where I want to get with these mods. And hopefully our 98RON fuel will help us too.

 

NATHAN - (or anybody who would know) -

Generally just how "bulletproof" or otherwise is the

Engine
Gearbox
Diff

on the standard Z ?

I constantly worry since multiple bad experiences wirh STI and WRX 'boxes and diff.

Nissan once had an excellent reputation, but whats the word now? Anyone had synchro probs as in USA?

FROZTY

 

Frosty

Motor : bulletproof if you leave it alone. Raise the BMEP and you must be able to make management adjustments to control it as our ECU is a difficult beast

Gearbox: Big & stong, designed to take pleanty of TQ, but those big strong gears are hard to slow down & the syncro,s have to work hard. Nissan is now on its third update.The first cars like mine had double syncro rings on the lower gears. Yours all have triple.
Diff : We have had absolutly no trouble with ours, but we do run a diff cooler as we are using Cusco LSD & this raises the temp

 

NATHAN - thanks. Feel a lot more comfortable.

'Wonder when the triple synchros were introduced? Vin No. ?

When they mod the US cars for grinding, 'wonder if they put the triples in. There were lots who had further probs a short time later.

Thanks again,

FROZTY

 

When they mod the US cars for grinding, 'wonder if they put the triples in. There were lots who had further probs a short time later.

Yeah I read up on the US gearboxes having alot of troubles and wondered if we had an improved version?

I guess from that respect its good that US get some cars before us... maybe not, i am impatient.

 

Yeah Zuffy - you buy it, - I'll use it.

Godzilla lookin' better value all the time!

FRIZBEE