this is really a newb Q, coming from an old guy...LoL!

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Postby theUNYTEDone » Thu Apr 27, 2006 9:24 pm

i'm really shady as to how this ROM tuning works...is there a thread that clarifies this? i'll do a search right now...
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Postby db » Fri Apr 28, 2006 7:22 pm

ROM tuning is basically when someone cracks into the stock ECU and reprograms the fuel and ignition maps. So everything works like stock, except the maps are changed for better performance.

However, unless you have the ROM tuner working directly on your car, they can only program the ROM to the best of their ability depending on what modifications you have told them about.

Skip the 256 cams. 264s still work great for daily driving, and cost less. The 256 cams from HKS actually cost more than both the 264s and the 272s.

Running the stock fuel system at 300 awhp is really a bad idea. 550s, a larger flowing fuel pump, and an aftermarket FPR are probably the minimum requirements for that power level.

Forget the VPC, its really outdated, and over priced, not to mention discontinued.

Most of the 300 hp dynos with the CT27 are also on race gas. A T3/T4, or TD06 is probably your minimum for 300 hp daily driven power.
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Postby theUNYTEDone » Fri Apr 28, 2006 10:26 pm

mkay...so from what i've gathered thusfar...upgrading my fuel system, and getting my turbo upgrade will do the trick? BayAreAT recommended the hydra nemesis system, but how simple is that to use? if possible, i'd like to maybe use just the ROM tune...basically for that, one jus gives the seller the list of mods, right? and then from there they calibrate everything accordingly?
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Postby d1alltrac » Sat Apr 29, 2006 4:42 am

theUNYTEDone wrote:mkay...so from what i've gathered thusfar...upgrading my fuel system, and getting my turbo upgrade will do the trick? BayAreAT recommended the hydra nemesis system, but how simple is that to use? if possible, i'd like to maybe use just the ROM tune...basically for that, one jus gives the seller the list of mods, right? and then from there they calibrate everything accordingly?


you have the basic idea of the ROM tune, i think ATS is supposed to be working on ROM tunes for the SB46 too.





i guess i dont quite qualify as "old"....i remember the old color scheme (much better) but i dont even know about the old yahoo groups,
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VPC correction

Postby GMan » Mon May 01, 2006 10:47 pm

> toayoztan
> Bryan
> Location: Oklahoma City, OK USA
> Posted: Thu Apr 27, 2006 8:31 am
> EMS replaces the ECU completely.
> VPC (vane pressure converter) just rids the AFM

Right there.

> The VPC basically "learns" from the AFM, and after it learns,
> the AFM can be removed and the VPC is then used instead.

Nope. The VPC uses a chip, pre-programmed for the engine and tune of the car.
If you have the appropriate burner, for the chip; you Can make one.
But the VPC does not learn. Very much like the ATS ROM tune, it is static.
There are chips out there for stock, 550, or 720 injectors.
Aaron may be able to tune a VPC on a dyno to for a custom tune ?

It is Great if you just want to get rid of the AFM and go a bit
further on tuning, but do not want ( cannot afford?) to spend Money$ on tuning
a stand alone. They can be hard wired or you can find a harness
and just plug it in. A nice addition is the GCC to fine tune fuel vs rpm.

New VPCs No longer available, but deals come up on used models.

> Internals are optional, like i said, it's not needed.

Well we agree there

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Postby toayoztan » Mon May 01, 2006 10:57 pm

Thanks for the correction GMan. But however the VPC works, it still is limited, but for about 300awhp, it may be ideal.

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vpc hp limit

Postby GMan » Thu May 04, 2006 12:26 am

> toayoztan
> Location: Oklahoma City, OK USA
> Posted: Mon May 01, 2006 10:57 pm
> Thanks for the correction GMan.

Hi Bryan;

No problem.

> But however the VPC works, it still is limited,

Limited How ? By the fact is is hard to program ?
I agree with you in that case.
You would need a chip burner, or a friend with one. :-)

> but for about 300awhp, it may be ideal.

For any hp you would care to have it tuned for ? :-}

It Only eliminates the AFM. On out cars May be around 300hp with a 550 chip.
But with a bigger turbo, and timing support BTM, or ITC, the sky is the limit ?
I said you can get a 720 inj chip. Toyomoto in FL probably
could tune even higher ? How well it would idle etc is a different
story, all dependent on the tuner/chip burner.

Supras get Sick hp out of just a VPC removing the AFM.
(and turbo + fuel upgades)

The VPC is a mixed bag. Good and bad. It is plug and play,
but not ideal for a full tune of fuel and timing.
For the cost new, it is not worth it, but since they were
discontinued, they are pretty good deal used. :-)

For the usual owner it may be all that is needed to
break 300 hp ? A full ems is a better way to go in
the long run If you can afford the unit and tuning. (or do it yourself ? :-)

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