What can I get out of this spec list?

[Jim_rx7]

Chaps,

I might be coming back to the world of Rx7\'s soon. I had one a year ago or so, the engine went pop and I performed an engine swap at the side of the road.

I then sold it, had a GTO, Skyline, Supra TT.

The car I might be getting has the following spec list :

Engine:

13b-REW Engine (3000 ish miles)
HKS Twin Air Filters
Air Pump Removed
Blitz Dump Valve
APL Intercooler
Aeromotive FPR
Walbro Fuel Pump
4 x 850cc Denso Injectors
Full Non Sequential Turbo Conversion
HKS Downpipe
Re-Amemiya Centre Section
Racing Beat Back Box
Apexi Power FC Commander


Just curious as to what the above should be putting out at the moment as it\'s running on stock turbos.

Also wondering what I could get out of it with the currecnt injectors etc if I were to go single turbo?

Am I right in thinking all I would need is turbo/manifold remap to go single?

[m1tch]

Try and have a look at this calculator:

http://rx7.com/cgi-local/3rdgencalc.cgi

Apparently the very limit on stock twins is about 400ish, knightsport twins apparently push more than that, but don\'t quote me, im an FC guy

[Jim_rx7]

Cheers.

So what\'s the most I could get from going single without porting the engine etc? The engine has not long been rebuilt, 3K miles ago. Don\'t think any porting was done at the time.

[m1tch]

Hmm well without porting the engine, a larger turbo might take a while to spool, perhaps its best to run on stock twins as they are matched to the stock porting and perhaps upgrade the injectors, fuel map and fuel system?

[SiH]

I\'d GUESS 360-370. I\'m running just over 340 on a similar setup but maxing out the stock injectors pretty much. (well. 93% peak!) on sequential with stock ports.

It\'s the fuelling that\'s holding me back at the mo.

[Dr-Rotor]

To go single you need the following. Turbo, Waste gate, New down pipe, New clutch, New manifold and a re-tune.
 
Stock ports with the injectors you have you can get around 350whp - 400whp depending on the turbo.
 
You will need a new clutch as the added power will eat the stock one.

[interloper393]

id rekon about 360atf bud, mine was 350 at 0.8bar on stock fueling with similar mods

[Jim_rx7]

360 atf, not too bad.

How much does it hold it back by not having a ported engine? What would you notice if using a larger turbo on a non ported engine?

Tbh, I\'d probably only really go for about 450 to 500bhp atf max. Is this possible/useable on stock ports?

[skybusr34]

dont think 500 fly is possible on stock ports mate. i`d say 420fly or there abouts!!!

[Jim_rx7]

Iss there any porting work you can do to aid things without taking the engine apart? (seeing as it\'s not long been rebuilt)

[BlitzBoy]

dont think 500 fly is possible on stock ports mate. i`d say 420fly or there abouts!!!

not strictly true, if you put a big enough turbo and run lots of boost you can do it, it will take ages to spool though lol

Porting helps to spool big turbos and a lot earlier, moves the peak power up the rev range and the power scope is bigger

[BlitzBoy]

Iss there any porting work you can do to aid things without taking the engine apart? (seeing as it\'s not long been rebuilt)

no it needs to come apart to port the plates

[BlitzBoy]

with your mods on twins depending on tune about 300rwhp 360 flywheel, you can get more with water injection if you tune with it, putting a single on at 1 BAR will probably net you around 340 at the wheels at 1 BAR or just over, but each car/engine is different, some will get more some will get less

[interloper393]

id say the to4e is the best all round turbo for a non ported engine and should see between 350-380bhp

[Jim_rx7]

350 to 380 atw, or fly?