BB Throttle body MOD issue

[Psmithavsupplies]

Hi all, A BIG PLEASE HELP! - big bore Throttle body MOD issue



From what i have read this problem seems unique so here goes.

Symptom:
Transmission flare, most prominent in 2-3.
only when big bore throttle body is fitted.
first shortish test run is usually fine, but another couple of runs and it gets worse and gradually worse until its happening in all gear

mods on car so far; (I'll list em all in order of what i feel may be most relevant)

* BB throttle body (made by a Fitter I know who has made several successful of these so far except mine), He has re-checked his work since and can't see a prob.
* Transmission rebuild + stage 2 transgo shift kit. (professionally$$$)
* Mod memcal - EBAY Blackstar 7000 (thats the seller)
* Air Hog Filter
* Super charged cold air intake
* Extractors
* 2.5" sports exhaust & hiflo Cat
* REPCO thermo fan controller
* wheels, struts, springs
* lots of stereo stuff i'm assuming is irrelevant.
* Superficial and fascia

what I've Tried & more info;
The problem is basically that only when the BB/modified throttle body is on the flareing is experienced.

* It may be important to note that the modified throttle body is from a wrecked VT,
......... yes i fitted a new VS SII TPS.

(I could see absolutely no difference between them.)
I've tried my old memcal with my spare PCM - no change

tried my throttle body on friends VX same thing.....(thats when i sent it back to be checked by fitter who did the mod.... just to add he is a highly qualified mechanic at the holden.)

I'm ok with buying a new one if the throttle body is the issue,
However..........
as many of you are probably aware, buying new parts just to see if it fixes the problem, can end up being an expensive investment into a cardboard box of "spares".

If its an issue with the BB-TB, surely some one else has had the same issue.

has any one seen this before?

any help would be awesome!

[Brett_jjj]

Maybe the new throttle position sensor is faulty.The transmission uses the TPS signal to shift properly.Ive seen problems with aftermarket sensors even when they have been brand new,try to use genuine holden ones.

[delcowizzid]

typical big throttle issue really requires a tune to set the shifts properly bet it changes gears real early when you are just cruiseing

[Psmithavsupplies]

are yes it does, so a new memcal/ cusom tune then?
any suggestions on where to go for good work and good $?
i'm in albury (border vic and nsw)
im happy to travel to melb.
how much should a custom tune cost?
is it worth getting a hot cam first?

[Andrew426]

is it worth getting a hot cam first?

YES


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[delcowizzid]

i can send out a tune to fix the issues

[Psmithavsupplies]

i can send out a tune to fix the issues

That'ed be awsome, $$ send me your details, (or sms price and acc to 0412720164 and ill wire it today)

Thanx heaps!

[delcowizzid]

send me a pm and ill sort you out