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 :D

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 :D

[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.

[BlitzBoy]

yep that will reduce the CR nikp, but you will hurt low speed cruise and accelaration if you do. A turbo rotary CR is low enough, you just need WI to run big boost safely on a big ass turbo

[nikp]

yep that will reduce the CR nikp, but you will hurt low speed cruise and accelaration if you do. A turbo rotary CR is low enough, you just need WI to run big boost safely on a big ass turbo

I was actually saying that's how the CR is lowered in the first place - it would have to have a factory lowered CR to be able to run, otherwise the engine would blow itself apart - and that's what the tubs are for.

However, i have i think, been talking a load of cr@p recently - comes from being bored at work with lack of stuff to do. So maybe all my posts should come with a health warning!! :p

[Rixio]

Ok now thats all just whizzed over my noggin @ 600mph...:Hammer

[BlitzBoy]

lol thats ok Nik I knew what you were getting at,
the conclusion is for someone to run this Bad ass turbo he is selling you dont need to lower the CR any further on a 13Brew.
I would recommend a ported motor though to spool up that bad boy with WI

[chip-3door]

Its actually a relatively quick spooler anyway, due to the lightweight components that the BB core allows, so less inertia.

Should be no laggier than a conventional dirty old T4 really.

[Rixio]

On the subject of turbos...iv just bought the xspower one from kev but he said

"Turbo was pulling smoke through exhaust on overrun, there is no excess play in shaft so may have poor drainage back to the sump"

WTF does that mean???

[BlitzBoy]

Means too much oil pressure is entering into the Centre Cartridge, you can put a restricter into the oil feed to regulate how much oil is supplied into the turbo

[chip-3door]

Based on the XSpower turbo's ive seen it means that its a cheap crap copy made in china :(

Loads of crap from them sold through ebay etc http://www.passionford.com/forum/images/smiles/wall.gif



Assuming it is just drainage though, he means that the path from the turbo to the sump has too much resistance in it (bad pipe layout or whatever) and as a consequence excessive amounts of oil are building up in the turbo and causing it to get past the seals and in the compressor housing.

[Fish]

What size exhaust housing is on it?

Fish

[chip-3door]

.91 A/R hotside mate.

[Rixio]

Based on the XSpower turbo's ive seen it means that its a cheap crap copy made in china :(

Loads of crap from them sold through ebay etc http://www.passionford.com/forum/images/smiles/wall.gif



Assuming it is just drainage though, he means that the path from the turbo to the sump has too much resistance in it (bad pipe layout or whatever) and as a consequence excessive amounts of oil are building up in the turbo and causing it to get past the seals and in the compressor housing.

So does that mean it needs a rebuild?

[K1HKS arse]

I had a gt42r on my ported motor before it sh*t itself and smashed the turbo to bits.Engine and turbo had only done 2500miles!!!!!!!!!!!!

It spooled up very well actually making a bar at around 4500-5000rpm.If i hadnt just bought a new turbo to replace it i would of had this for sure.Havent got the dosh now though,was looking for one of these about a month ago.

Well worth the money,you want big power then this is the kidda.Excessive motorsport in the states made over 600rwhp @ 30psi with one of these.

[chip-3door]

So does that mean it needs a rebuild?

Depends on what is actually wrong with it.

If its a manufacturing fault then it potentially needs sending back under warranty, if its just too much oil pressure and it hasnt actually damaged the seals you might get away without having to do anything to it if you give it a decent oil return when you use it.

Impossible to say :(

[Rixio]

So what would be the best course of action...??? dont want it to blow and sh!t bits into my engine...

[chip-3door]

Take it to someone to be stripped and inspected.

Potentially quite expensive though, as really needs to be balanced when it all goes back together.

[Rixio]

Ah its all good...if it needs rebuilding it needs rebuilding...

[chip-3door]

Healthy attitide to have :D

[Fish]

So really, as you are trying to sell this YOU should get this sent off and checked, this would put buyers minds at ease.

Fish

[chip-3door]

So really, as you are trying to sell this YOU should get this sent off and checked, this would put buyers minds at ease.

Fish

Are you talking to me?

This GT42R turbo is brand new, you can phone turbo dynamics and talk to them about it if you like, its perfect, cost my mate 2700 quid originally, there is nothing to check?

the conversation above was about a different turbo, bought secondhand, are you getting confused with that one?

[Rixio]

Fish im talking about the XS power kit i just bought...nothing to do with this big ass mutha of a snail...

[Fish]

Sorry, my bad.

Fish

[arrouk]

rixio might be an idea to remove that bit of thread so as to not spoil this mans for sale thread.

matt

[chip-3door]

Nah its ok, anyone reading it can easily see its not my turbo he is referring to.

Doesnt bother me the comments being there :D

[richard cash]

where can you get a manifold from for this turbo? i just looked on ebay USA and AUS and google and didnt really get anything useful. I wondered about this as when i saw the turbo on gregs car and on the reworx one it looked much higher up in the engine bay than a normal turbo, this must be due to how fat it is. My Gt40 is way smaller than this and it only just fits between the engine and strut case on the body.

If it does move the turbo higher up then a custom downpipe will be needed too surely??

finally, when i spoke to tim at rxmotors about GT42R's he said greg has an american type one with a 6" exhaust flange, in his workshop tim has one from aus with a 5" one. What size does this have??

[nikp]

I believe some of Gregs bodywork had to be cut to accomodate it too.

[Mazdarotaryparts]

Hi Richard,

We supply a total bolt on GT42 Turbo kit for Gen3's and Gen2's, these kits fit straight on properly and come with all the nuts bolts oil lines etc to bolt this kit on without specialist help.

( details are on this link)
http://www.mazdarotaryclub.com/forums/showthread.php?t=30402


Pictured are Garys installation that we supplied and another GT42 Turbo kit with spark plug box so you can see how big they are.

When you get these out the box you think OMG how on earth does that all fit in the space available, but Gary will tell you it not only fits but all those HUGE pipes fit first time as well straight into an unmodified engine bay :driving .

[Lum]

Are you talking about greg in Bristol?
If so i know him and spoke to him when i first saw this for sale and he said that this is not the same turbo as his anyway!
I think his is a slightly differant version with a differant exhaust housing that is designed to work better with a rotary!
Sorry for the lack of technical reasons why it's differant! just what he said when i told him this was for sale and i was considering buying it!

[Mazdarotaryparts]

Are you talking about greg in Bristol?
If so i know him and spoke to him when i first saw this for sale and he said that this is not the same turbo as his anyway!
I think his is a slightly differant version with a differant exhaust housing that is designed to work better with a rotary!
Sorry for the lack of technical reasons why it's differant! just what he said when i told him this was for sale and i was considering buying it!

I hope Greg has his sums right with the type of GT42 he has fitted because the GT42 we specify is a Hybrid made up specifically for the Rotary its actually very nice for us that we have passed some technology back to Australia with our conversion because as a result of working closely with the company we distribute for, as they are now selling this kit out in Aus with very happy customers .

[mattmaclennan]

Everyone was talking about Chip-3door's turbo Clive... Greg knows exactly what he's talking about. Whoever buys his 42R will need a manifold and downpipe, turbo oil feed and drain, wastegate, wastegate plumbing and preferably a boost controller. The conversion is relatively simple as long as you are paitent and handy with a welder. You can sell your stock twins to pay for the manifold! Greg had his manifold specialy made for him in America. You can get it done here, but you need to be prepared to "finish" it. It can get quite invloved as the wastegate needs to be fed from both runners as equally as possible. Wastegate should be no smaller than 50mm, best to try and find a 60mm. The downpipe is a walk in the park, as are oil feed and drian. Then all you need is a combination of elbows and pipes to connect to the intercooler. Some heat shields are a really good idea as these kick a hell of a lot of heat out. Your steering UJ is very close, and you wouldn't want to cook all the grease out of that now, would you! Big air filter, more fuel and your about there.