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Boost controller necessary with ROM tune ? [Archive] - Toyota MR2 Message Board

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Boost controller necessary with ROM tune ? [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > Welcome To The Toyota MR2 Board! > MR2Board Sponsors > ATS Racing > Boost controller necessary with ROM tune ? PDA

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mach5mr205-05-2008, 10:22 PMIs a manual boost controller necessary with a CT-27 package and ROM tune ? Does the ROM tune up the boost ? What exactly does it do ?

John ATSAaron05-05-2008, 11:12 PMSome sort of boost controller (manual or electronic) is necessary to see maximum gains with the combo kit. The tuned rom does not increase boost. Details on what it does:

Tuned ROM features:

Remove factory fuel cut (for the conservative types out there, we can raise it to approximately 14.5 psi)

Raise factory rev limiter to customer specified amount (from 7200 rpm to approx. 9000 rpm, Our most popular option with stock valve train is 7600 rpm)

Lock out cold weather fuel timing maps - retains factory fail safe maps to protect your engine

Dyno tuned timing maps

Dyno tuned fuel mapping

Thanks,

Aaron mach5mr205-06-2008, 01:56 PMSo if I got a CT-27 package with a ROM tune on a stock engine, would that ROM be good with a boost controller installed later, or would that ROM tune need to be adjusted ? If I got the CT-27 package, what would a safe boost level be ?

John ATSAaron05-06-2008, 02:51 PM16 psi on 91 octane, 17 psi on 93 octane.

You won't need to retune later for adding a boost controller. But, wow a combo kit with no boost controller? Talk about delayed gratification.

Aaron ixtlann05-20-2008, 07:42 PMI noticed u mentioned rasing the rev limit to 7600 rpm from 7200, is it hard to make it make power until 7600, like just a good upgrade turbo?

Some sort of boost controller (manual or electronic) is necessary to see maximum gains with the combo kit. The tuned rom does not increase boost. Details on what it does:

Tuned ROM features:

Remove factory fuel cut (for the conservative types out there, we can raise it to approximately 14.5 psi)

Raise factory rev limiter to customer specified amount (from 7200 rpm to approx. 9000 rpm, Our most popular option with stock valve train is 7600 rpm)

Lock out cold weather fuel timing maps - retains factory fail safe maps to protect your engine

Dyno tuned timing maps

Dyno tuned fuel mapping

Thanks,

Aaron ATSAaron05-20-2008, 07:56 PMIt doesn't make more power there, but it puts you in a better rpm range when you shift, so you get more power to the ground.

Aaron mach5mr208-19-2008, 10:29 AMYou mentioned raising the fuel cut to 14.5. The 93+ has the fuel cut at 16-16.5 already. Can you change the fuel cut to any level via the ROM tune ? I would like to get a CT-27 and raise the boost to the recommended 17, and still have a fuel cut at about 17.5 in case something goes wrong.

John ATSAaron08-20-2008, 11:49 AMThe 93 ECU fuel cut is not always consistent at 16. I think it's a variance in the boost sensor itself. I don't like to promise what I can't consistently deliver.

The value for fuel cut in the 93 ECU is a 238. The maximum value is 256 and completely removes fuel cut. I could set your fuel cut to 255, but because of the resolution of the stock map sensor I can't guarantee that will be 17.5 psi.

Aaron mach5mr208-21-2008, 10:06 AMInteresting. Any idea what the typical range of the 93 fuel cut is ? If I install a FCD, would it be more consistent, or would it suffer from the same variances ? What do people typically do on a 93+ with a CT-27 that they want to run above the factory fuel cut ?

John ATSAaron08-21-2008, 11:46 AMWe all eliminate the fuel cut.

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