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what stock throttle body to use when putting front facing intake on r34 gtt

JC71

By JC71,
in R Series (R30, R31, R32, R33, R34)

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JC71 Community Regular

JC71

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Posted (edited)

like the title says, I am asking for clarification as what stock throttle body should be used when putting front facing intake on r34 gtt rb25det neo engine?

(shortest type possible, but stock size, proper electrical and cable connections and wont alter run-ability, as the stock r34 gtt is simply too long, as it has dual "baffles" traction control,  type throttle body.)

I know I 've seen this info below but couldn't locate it.

r33 rb25det non neo?  gtst? series 1, 2?

 

 

Edited by JC71
joshuaho96 Veteran

joshuaho96

Posted
Posted
On 9/12/2024 at 10:47 AM, JC71 said:

like the title says, I am asking for clarification as what stock throttle body should be used when putting front facing intake on r34 gtt rb25det neo engine?

(shortest type possible, but stock size, proper electrical and cable connections and wont alter run-ability, as the stock r34 gtt is simply too long, as it has dual "baffles" traction control,  type throttle body.)

I know I 've seen this info below but couldn't locate it.

r33 rb25det non neo?  gtst? series 1, 2?

 

 

You are not going to do a direct drop-in. A complete front facing intake like the RB26 on an RB25 is a major change and transient fueling mapping which is already a bit of a guess will be completely off.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

DBW e-throttle conversion.

Will drive better, idle better, have superior throttle articulation (change the slope however you want), proper cruise control, boost control (by limiting throttle max open rate based on boost / engine speed thresholds) etc. 

Everything the stock throttle can't do.

Only downside, you can't open your bonnet and record a selfie video with the throttle at WOT yelling "RB Powahhhhh woooooooooo"

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JC71 Community Regular

JC71

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  • Author
Posted

I found two used throttle bodies both claiming to be from a R33 RB25DET, I bought both, when one showed up it has a large center rod with a flat side for the center drive of the TPS.

The other has a much smaller center rod with a smaller cross rod through it making a "X".....this style matches what my rb25det neo engine has, so I will be able to use this throttle body and my org wiring and reuse the sensor itself.

I don't know why the other has the other version (both said TB from S2) but no matter I was glad I ordered both, as I found one that will work nicely. 

MBS206 Grand Master

MBS206

Posted
Posted
4 hours ago, JC71 said:

I found two used throttle bodies both claiming to be from a R33 RB25DET, I bought both, when one showed up it has a large center rod with a flat side for the center drive of the TPS.

The other has a much smaller center rod with a smaller cross rod through it making a "X".....this style matches what my rb25det neo engine has, so I will be able to use this throttle body and my org wiring and reuse the sensor itself.

I don't know why the other has the other version (both said TB from S2) but no matter I was glad I ordered both, as I found one that will work nicely. 

Did you happen to read anything above anyone has said?

Especially things like "it's going to need a complete retune"?

IE, none of this will be safe to run once you plug it all in.

And then secondly, the fact that pretty much none of your wiring will reach, and likely the throttle cable won't reach etc.

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JC71 Community Regular

JC71

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I did read it all, but been restoring and fabricating classic custom award winning vehicles for 30 years, so I don't think some wiring and a cable will be a problem.  doubt a retune will be needed, not with these changes, and not necessary as essentially everything will be "stock".  just changing the location of the throttle body, wont make much of a difference, engine and ecu wont know the difference, still will get air, spark, compression, fuel, and sensor readings. All will still functions the same as same size and type of components used. additionally I am in the US, so in a few years if someone around here gets experience with tuning these cars properly and or I can obtain the proper software, program, etc. and experience, then maybe someday a tune will be done, simply to optimize potential performance.

Edited by JC71
GTSBoy Grand Master

GTSBoy

Posted
Posted
3 hours ago, JC71 said:

doubt a retune will be needed, not with these changes, and not necessary as essentially everything will be "stock".  just changing the location of the throttle body, wont make much of a difference,

Wrong. FFPs flow very differently to the stock plenum and it's a very long way from ideal to not address the per-cylinder mixture changes that result.

TurboTapin Experienced

TurboTapin

Posted
Posted (edited)
6 hours ago, JC71 said:

I did read it all, but been restoring and fabricating classic custom award winning vehicles for 30 years, so I don't think some wiring and a cable will be a problem.  doubt a retune will be needed, not with these changes, and not necessary as essentially everything will be "stock".  just changing the location of the throttle body, wont make much of a difference, engine and ecu wont know the difference, still will get air, spark, compression, fuel, and sensor readings. All will still functions the same as same size and type of components used. additionally I am in the US, so in a few years if someone around here gets experience with tuning these cars properly and or I can obtain the proper software, program, etc. and experience, then maybe someday a tune will be done, simply to optimize potential performance.

Don't ask questions, if you don't want to listen to the answers. It's not a good trait. As for tuning RB's and proper software and experience, it's been a thing in the US for decades. 

Edited by TurboTapin
Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
6 hours ago, JC71 said:

I am in the US, so in a few years if someone around here gets experience with tuning these cars properly and or I can obtain the proper software, program, etc. and experience,

If you can tune a JZ, you can tune a RB.

Same same but different. Pork Gyoza vs Beef Gyoza, both Japanese.

  • Like 1
TurboTapin Experienced

TurboTapin

Posted
Posted (edited)
18 minutes ago, Dose Pipe Sutututu said:

If you can tune a JZ, you can tune a RB.

Same same but different. Pork Gyoza vs Beef Gyoza, both Japanese.

We've had RB's in the US and Canada literally for decades. They were always a popular S chassis swap. We could also legally import R32's into Canada back in 1999.

Edited by TurboTapin
  • Like 2
MBS206 Grand Master

MBS206

Posted
Posted
13 hours ago, JC71 said:

I did read it all, but been restoring and fabricating classic custom award winning vehicles for 30 years, so I don't think some wiring and a cable will be a problem.  doubt a retune will be needed, not with these changes, and not necessary as essentially everything will be "stock".  just changing the location of the throttle body, wont make much of a difference, engine and ecu wont know the difference, still will get air, spark, compression, fuel, and sensor readings. All will still functions the same as same size and type of components used. additionally I am in the US, so in a few years if someone around here gets experience with tuning these cars properly and or I can obtain the proper software, program, etc. and experience, then maybe someday a tune will be done, simply to optimize potential performance.

Feel free to not take the advice and knowledge of those who've been playing with these cars and engines specifically for about 20 years EACH. But we've all been there, done that.

What you've just dribbled is total nonsense about not needing a retune, or no one in the USA being able to tune an RB.

 

It seems you're just here for someone to tell you your bad ideas are good. For that, you're on the wrong platform. ;)

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