Just wondering is there any advantage on turbo engines to running one throttle body per cylinder like jenvey or similar, instead of just one larger throttle body on inlet manifold

 

many advantages as they help fine tuning fuelling across cylinders specifically, but mainly response though.
i think it was the nissan gtr (pulsar/sunny) that was one of the first cars to do this

 

Throttle response mostly.

But they will cause lots of tuning headaches for very little gain...if any gain at all.

Unless you absolutely need super crisp response, I wouldnt even consider multiple throttles.

 

There are more disadvantages than advantages using ITV's in a turbo application. Whilst you will have an apparent throttle response advantage off boost, in reality it's how much turbo lag you have that determines how responsive the car is to drive. This is the same regardless of throttle arrangement.

The major disadvantage is the mapping problems. This is because when using ITV's you encounter considerable difference in actual airflow against the same boost pressures at different throttle angles, meaning that you cannot map against either throttle angle, OR pressure alone. You actually have to compensate for throttle angle in addition to pressure (i.e. half throttle at 1 bar boost is not the same air flow as 1 bar WOT) which requires complex mapping.

A minor disadvantage is the fact you now have a throttle spindle in each inlet tract which acts as a restriction in comparision to the completely unrestricted tract of the single TB setup.

So all in all single TB is best for aftermarket ecu turbo setups, power and ease of mapping!

 

I have mapped a few and the last was a 808hp Evo and I must say I am a very big fan on how they driven.

Mark

 

Here is a good thread....

http://efi101.com/forum/viewtopic.php?t=8422

 

my rb27 has just been mapped on its 6 tbs, the light load couldn't be done on the dyno so we did it out on the road, it had to be kept a little on the richer side but cruises real nice and smooth

 

So not possible to map it correctly on the ecu you run.

Mark

 

Im fitting ITB's to my new engine. That EVO sets new standards for response on such a Powerfull engine it makes mine feel like a sloth on diazapan. Latest Electronics, Turbo's & correct head/cam Spec's make these latest generation 800bhp cars respond like an engine on a GT30.
It will work Karl be assured .

 

? im not sure where you got that from mark ?

it wasn't possible to map the cruise part on the dynapack as the load couldn't be run light enough to mimick the lightest load cruise points.

so we went out for a drive and it was trimmed on the road, only minor adjustments, the fcon was/is fine though but with my cams trying run run 14.7 it can get grumpy so it was kept abit richer nothing to do with the ecu.

 

Cheers for responses think il just stick to what i have so and find something else to stick them on so

 

i run them on my turbo engine setup, i have great response and it does very good power for the boost level