Large Throttle Body A Necessity?

[burko1]

OK I HAVE JUST FOUND OUT THE XF THROTTLE BODY I HAVE OPENS THE OPPOSITE WAY TO A STANDARD R33 ONE. THAT MEANS I CANT USE A STANDARD TPS , AND TO MAKE LESS HASSESLS WITH THE WIRING I WANT TO KEEP THE STANDARD TPS. ARE LARGER THROTTLE BODIES OVER REATED OR NECESSARY ON A 300 PLUS KW ENGINE

[manage13]

Well IMO. I think big throttle bodies are a waste of time. Especially on a GTR! Kier Wilson is still using the 6 standard throttle bodies in his 8 sec GTR. The 6 throttle bodies provide better response than a big single throttle body.

If you want a GTST in the 300-400kw mark I really think spending the money on other components of your car will be more advantageous.

But this is only my personal opinion!

[Fitzpatrick Speed Works]

Well IMO. I think big throttle bodies are a waste of time. Especially on a GTR! Kier Wilson is still using the 6 standard throttle bodies in his 8 sec GTR. The 6 throttle bodies provide better response than a big single throttle body.

If you want a GTST in the 300-400kw mark I really think spending the money on other components of your car will be more advantageous.

But this is only my personal opinion!

<{POST_SNAPBACK}>

Keirs is far from standard, and at that level it is more of a tuning preference. Keir can run the six throttle bodies and not notice the disadvantages as much as others might as it is a full blown drag car and only sees full throttle. I am not argueing against the standard nissan setup it it great but it limits you to power fc or a motec, plus with a big turbo you will be forced to run afms (again not a disadvantage but damn expensive) because you are basically stuck with a power fc when using 6 throttle and they are AFM computers. To answer you question a single throttle body isnt a nessisity as there is no restriction there standard its just a matter of preference. Myself I will be running a single throttle as I am running a maf based computer, also I am running a GT head cooling system which is very hard to do with the six throttle, it is a packaging thing.. Tell us more about your circumstances and people can give you more accurate answers.

[WHITER33GTS-T]

I still have the standard throttle body and plenum and made 300rwkw.

[manage13]

I am not argueing against the standard nissan setup it it great but it limits you to power fc or a motec,

<{POST_SNAPBACK}>

What about an Autronic and Power FC pro?

plus with a big turbo you will be forced to run afms (again not a disadvantage but damn expensive) because you are basically stuck with a power fc when using 6 throttle and they are AFM computers.

<{POST_SNAPBACK}>

If you are using a big turbo (or big sets of turbo's for that matter) are you only restricted to using air flow meters? It's a general rule that if you go the high mount turbo you should loose the AFM.

Also the Motec and Autronic units are far superior to the PFC. Both the Motec and Autronic can handle the 6 throttle bodies and do not require AFM.

I am sure there are advantages to going the big single as s13drifter said. However, I am yet to be convinced.

The fact of the matter is, nearly all quick track GTR's and quite a few quick drag cars retain the standard throttle body set up. Mines swears by the set up!

Please don’t think I'm trying to force my opinion on anyone I'm just stating my point of view.

[burko1]

OK WELL ITS A GTST R33 AND YEAH I HAVE A AFTERMARKET COMPUTER A HALTEC , BUT IT IS PIGGY BACKED ON THE STANDARD ECU. SO THE STANDARD ECU STILL CONTROLS THE IDLE SOLENOIDS AUXILARY AIR VALVE ALL THE IDLE CRAP , AND IT NEED THE STANDARD TPS TO RUN ALL THAT. YEAH I CAN REWIRE AND PUT ANOTHER TPS AND REWIRE AN AFTERMARKET IDLE CONTROL VALVE BUT I HAVE DECIDED TO RUN WITH ALL THE STANDARD IDLE CONTROL SYSTEM.

I HAVE A GT3540 ON THE SIDE OF IT.

HOPE THAT HELPS

[Fitzpatrick Speed Works]

Burko I think at the level of mods you have an aftermarket throttle body is a worth while investment and will provide benefits. Yes you ca run the standard item to x amount but the same thing can be said about a number of engine components. At your stage you have to eliminate restrictions for the best possible result!!!

Manage

When i said Power FC i meant the whole Apexi range. Autronic will still struggle to give you a good result and you need a good tuner with alot of experience to make the transition from tps on a multi throttled car to boost map a smooth one!!! As a side note the effects of these change overs are far less noticable on a laggier system say a big single or big twins as the turbo(s) build boost slower and the mapping can be done in longer intervals making it more subtle and easier to get around. When I said you need afms I was referning to the fact you would be running a PFC or Motec due to the fact you are still running 6 throttle,(hope that made sense), so no you dont need AFMS on all single turbo setups only if you are thinking of using 6 throttles, which in turn limits you to certain computers... It isnt a bad thing its just a point i was making. Yes the 6 throttle are great and dont pose restrictions etc, but as forementioned all the cars you are using as example are race bred and drag cars, and arent shy on the cash either, twin q45 afms dont bother them where they might bother us as the price for 2 is the same as a normal power fc. Also Motec and Autronic are great but far beyond the reach of your average enthusiasts, manage you raise good points and people should consider them, I am just providing some other schools of thought!!!

Hope this helps,

Daniel

[manage13]

Cool, thanks for clearing that up Daniel I see your point.

BUT I got to ask you a question. I just want your opinion. I'm not going to argue or anything I'm just interested.

For a GTR or GTST aiming for the 300-400rwkw mark is it necessary to use a big single throttle body?

[R31Nismoid]

Cool, thanks for clearing that up Daniel I see your point.

BUT I got to ask you a question. I just want your opinion. I'm not going to argue or anything I'm just interested.

For a GTR or GTST aiming for the 300-400rwkw mark is it necessary to use a big single throttle body?

im using stock throttle body, RB25DET.

no problems making good solid power at all.

They are fine.

GTR's... Leewah's car is using an Autronic... and amazingly enough its not using a single trottle body either

Im confident they are stock tb's too, if not slightly modded.

From what i understand its driven quite often daily in peak hour. no problems.

Cant argue with his car's power or times, or driveability.

Many ~400kw GTR's using stock tb, and many mid 350's 33-t stock tb also.

stock tb's are fine. Invest $$ elsewhere IMO

[manage13]

I'm inclined to agree with you there R31Nismoid.