Whats required to fit a GT42R to a RX7 motor

[chip-3door]

As title really.

I currently have such a turbo for sale, and someone on this site was asking me what would be needed to fit it to his RX7, im afraid i dont know enough about RX7\'s to feel I could give a definitive answer to that, so can anyone else help?

[Rixio]

By no way am i an expert but...

Large ish Street Port Engine for quick spooling
Large FMIC
Good Boost Controller
Boost Gauge
Full Exhaust System Inc Downpipe, Manifold and Wastegate
Full fueling system upgrade...at the very least 850 primary & 1300 secondry
Stand Alone Fuel Management System
Full Remap
Uprated Clutch
Aftermarket BOV

I think thats about it...i think :o

[chip-3door]

So you dont need to drop the CR then?

Obvioulsy i realise it may be benefical to do so anyway if you were trying to make FULL use of the flow potential of such a large turbo (like 100lbs or so)

But it would still be acceptable on a standard engine? (other than the port)


That really is incredible

Fair play!

[BlitzBoy]

no need to drop the CR on a turbo Rotary like the 13BREW

But what you will need is a T6 frame exhaust manifold for that big mutha

[Rixio]

Whats a CR...sorry but like i said...Rixio = Noob :o

[BlitzBoy]

CR= Compression ratio

[chip-3door]

Basically the compression ratio is how hard the fuel/air mix is squeezed inside the engine.

If its too high it can lead to problems with heat buildup as you have to retard the timing to avoid detonation.

As you fit a bigger and bigger (in this case HUGE!) turbo, the air going in is more compressed to begin with, so potentially at some point you need to lower the amount that the engine then futher compresses it before it ignites it.

[BlitzBoy]

You wont need to drop the CR on the turbo Rotary though, there a quite a few guys running 2 BAR on a T51 turbo

[chip-3door]

I was talking in general, the CR is obviously just very low to begin with on those engines

[Rixio]

Innnnterwesting...so how would one drop the CR then if it did need it?

[chip-3door]

What happens if you dont do the bridgeporting?

Does it just limit how much power you can make, or does it make surge likely even on a .91 A/R hotside?

[chip-3door]

Innnnterwesting...so how would one drop the CR then if it did need it?

Essentially, you hack a chunk of metal off the rotors!

[sadgoth]

just remove the apex seals, that\'d do it lol

[chip-3door]

just remove the apex seals, that\'d do it lol

PMSL

Wouldnt actually change the theoretical ratio though :p

[nikp]

If you look at a rotor, you\'ll notice that there\'s a \'tub\' in each face - this effectively reduces the CR.