Found this on a new zealand site.
http://www.trademe.co.nz/Trade...8.htm
http://www.trademe.co.nz/Trade...9.htm
s14 with vh41 and itbs
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Mettler
- Posts: 1283
- Joined: Sun Jan 15, 2006 4:05 pm
- Car: HR31 GTS-8 coupe, VH41/45 Hybrid Transplant
Re: s14 with vh41 and itbs (gs14racer)
Yeh that's been around for a while, it recently participated in some rally hillclimb event and did quite well. It was also featured in a performance magazine recently too.
There's a number of crazy VH transplant cars in this country, half of which will probably end up here on nico eventually.
There's a number of crazy VH transplant cars in this country, half of which will probably end up here on nico eventually.
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riu
- Posts: 76
- Joined: Fri Jun 02, 2006 11:02 pm
- Car: 94 300ZX 2+2
89 Isuzu I-Mark RS
92 300ZX Slicktop
92 240SX SuperHICAS
Re: s14 with vh41 and itbs (Mettler)
has anyone other than this car or John Dixon experimented with an ITB set up for the VH yet? pro's con's? is it worth the effort and R&D or is the spider manifold really the way to go? or even a single log or twin log type?
Re: s14 with vh41 and itbs (riu)
Im working on it
I think it depends on your plans for the car. Street, racing, etc.
With fuel injection one would think the stock intake does not hinder performance. The limiting factor has to do more with CR, cams and bore size. The VH is optimized for the best power, mileage and reliability. Obviously with the ITB's your airflow and fuel input increases along with power output at chosen RPM's, but throw your mileage, efficiency, reliability, VVT and most of your usable low end torque out the window.
With fuel injection one would think the stock intake does not hinder performance. The limiting factor has to do more with CR, cams and bore size. The VH is optimized for the best power, mileage and reliability. Obviously with the ITB's your airflow and fuel input increases along with power output at chosen RPM's, but throw your mileage, efficiency, reliability, VVT and most of your usable low end torque out the window.
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riu
- Posts: 76
- Joined: Fri Jun 02, 2006 11:02 pm
- Car: 94 300ZX 2+2
89 Isuzu I-Mark RS
92 300ZX Slicktop
92 240SX SuperHICAS
Re: (T45)
so in the end its a matter of a streetable car with low end torque OR a gas guzzling monster that operates soley at a narrow band in the upper end of the rpm range? what about the single log or twin log type intake plenums?
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: (riu)
When you study the 16.5" runners [+intake track length in head] you see the tuning is designed to boost 4,000 rpm torque by ~~12% [2,000 rpm by 8%*] at the expense of >6,200 rpm HP [-3-4%]...............perfect for a 4,000 pound base [probably 4500 pounds loaded] lux car.
* More than half of this comes from complex tuning system in front of MAF
The tapered diameter of runners makes it difficult to just cut out a few inches to raise tuning torque rpm.
Changing cams [later IVC] without shortening the runners relocates [positionally] the second reflected filling pulse wave further complexing the situation.
When you optimize fuel and ignition advance the 4,000 rpm torque can get up to 333 lb/ft roughly equaling the brand new 4.5 engines but you run out of breath above 6500 rpm at 307-315 HP.
* More than half of this comes from complex tuning system in front of MAF
The tapered diameter of runners makes it difficult to just cut out a few inches to raise tuning torque rpm.
Changing cams [later IVC] without shortening the runners relocates [positionally] the second reflected filling pulse wave further complexing the situation.
When you optimize fuel and ignition advance the 4,000 rpm torque can get up to 333 lb/ft roughly equaling the brand new 4.5 engines but you run out of breath above 6500 rpm at 307-315 HP.