I haven't seen anything on a larger throttle body. Does anyone know of one or perhaps does anyone on this board bore out throttle bodies and supply new plates?

 

On the Durango boards there was a guy who rebuilt and tweaked throttle bodies. He got some GOOD dyno numbers with just that mod.

He would take the stock TB, grind/polish/port it until it was smooth and sleek in the air path. He replaced the butterflys with valves inset in to the shaft instead of on top of the shaft (thus decreasing the cross section). He did lots of little things and they really added up.

I wonder inf something like this would work on the Z. It is a really great mod since it is not extreme but good for some decent power (at least on the Durango).

(He also sells oversize TBs)

Here is a link. Could anyone here do this on a Z TB?



Fastman Throttle Bodies

 

I believe dwnshift tried a bored out TB and gained very very little, not noticable gains.

 

IIRC, dwnshift said there was no gain whatsoever...

 

On a side note to this...........this was before the ECU was done.
As to what TechnoSquare found out......a stock ECU actually starts to close off the throttle at the top end. (for what reason I have no idea). A bored out and polished throttle body would have gains mostly just up top....if the TS theory is true (which I believe it is) then a bored out t Body would have little or no gains on a stock ECU. When we ran this throttle body we were running on a stock ECU.
Who knows what will happen on a reprogrammed ECU.

 

what i wanted to see is if a bigger Q45 TB would work since its slightly larger diameter.. and TS *could* rewrite the controls to allow the Q45 TB to operate. but i cant find one for less than $700... not worth investing in. :P

 

Wow, I didn't even think about that. If the price is $700 for the core, however, I could imagine how much the finished product would be. Definitely not worth the hassle. Someone will come out with a custom TB eventually. I mean, you FI guys would really gain power with a bigger TB, right?


Was this an actual bored out throttle body with new plates or was it just a coned and polished TB? What size is the stock TB? So, if the throttle body starts to close up at full throttle near the top end then that explains why our power cuts out all of the sudden near the top. Did Technosquare solve this by allowing the throttle body to remain open? If so, I think I need this. I was going to wait and see what other people came out with as far as ECU tuning but I am getting sick of the fuel cut and other things such as this.

 

Yes TechnoSquare solved this issue. Tadashi is goooood!
We are selling bored out T Bodies just like the one pictured before. It is honed out and includes a new throttle plate.
The T body is $235+shipping (overnight) We will be doing a core charge with these. Basically you will need to send us your throttle body once you receive ours. If we dont receive yours..... then we will have to charge your CC the full amount for a T Body.

 

dwnshift what kind of results were found with the new t-body, horsepower/torque wise.

 

ditto, also.....would this mod only be worthwhile for someone with the technosquare ecu?

 

Now that we are on the subject of TB's, does the Z have an adjustable TPS? If so, what are the factory specs? I can't wait for a haynes or similar manual to come out so I can finally get some good info on the car. I adjusted the TPS on my 97 Probe GTS. I checked it and it was out of spec (on the low side) so I adjusted it up (there is a perfect sweet spot that the specs don't hint at) and VOILA, the car ran so much better. It was a pretty noticeable difference for the time invested and the minimal adjustment done.

 

As far as actuall number gains I have no idea. We have only been to a chassis dyno twice just to see where we are. I believe the TS reflash is needed to see proper gains with this.
When we did test this back in March we ran a stock ECU and saw no gains at the end of the back straight at mid Ohio.....but then we meet Tadashi and the gang from TechnoSquare.
Anyone going to a dyno soon?????
BJ

 

Throttle bodies rarely net any significant gains on any car.

Propaganda, let me know what you find out about the TPS

 

Depends on the quality (or lack thereof) of the stock unit.

On the durango the stock unit is sort of sloppy so a good bore/polish job nets some significant power.

If it doesn't net power for the Z it just means the stock one is pretty darned good.

 

I don't think the Z needs a Throttle Position Senser.

On most cars the gas pedal pulls a cable which open the throttle. The TPS tells the ECU where the throttle is (the position).

On the Z the gas pedal tells the compter where your foot is and the computer decides where to put the throttle. The ecu should know where the throttle is since it put it there.

I suppose it is possible there is a TPS to confirm the throttle position, but I sort of doubt it.

AndyB

 

Ahh, I see. So since my Probe had a cable throttle, that means it needed a TPS so the ecu would know the plates position. But since the Z doesn't have a cable throttle, but has a computer throttle, it doesn't need a TPS. Good deal. Thanks for the info!

 

<--forgot about the electronic throttle whoops

 

Most traditional TBs have a WOT switch that can be adjusted mechanically.

The Z has a procedure to recalibrate WOT and idle to the ECU which can be performed behind the wheel with the ignition switch (much like the ECU reset procedure.)

Here ya go...

Accelerator Pedal Released Position Learning ABS000RL
DESCRIPTION
“Accelerator Pedal Released Position Learning” is an operation to learn the fully released position of the accel-erator
pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each time
harness connector of accelerator pedal position sensor or ECM is disconnected.
OPERATION PROCEDURE
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch “ON” and wait at least 2 seconds.
3. Turn ignition switch “OFF” wait at least 10 seconds.
4. Turn ignition switch “ON” and wait at least 2 seconds.
5. Turn ignition switch “OFF” wait at least 10 seconds.

Throttle Valve Closed Position Learning ABS000RM
DESCRIPTION
“Throttle Valve Closed Position Learning” is an operation to learn the fully closed position of the throttle valve
by monitoring the throttle position sensor output signal. It must be performed each time harness connector of
electric throttle control actuator or ECM is disconnected.
OPERATION PROCEDURE
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch “ON”.
3. Turn ignition switch “OFF” wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.

 

Forgot to read the whole post he quoted whoops

 

We tested this at Daytona back to back in practice against a stock one and yes it made a difference MPH.