Renesis in MX5

jpc · February 23, 2010, 03:26:14 PM

I already have an RX7 and thought it would be fun to get my MX5 rotorised. It\'s currently up at WGT getting the existing engine removed in preparation.

The basic plan with the engine is

- Used series 1 engine from a low mileage rolled car, will be compression tested
- Decat, custom exhaust and intake to fit MX5 engine bay (pre-95 import so legal for MOT)
- Washer bottle for TCW3 supply to oil metering pump (managed by EOMP controller, AUS company)
- Adaptronic ECU, mapped for V-power, 99 octane
- Lots of sensors (Wideband, oil/air/water temps, MAP)
- MX5 alternator and P/S pump (possible depower the rack)
- Walbro fuel pump
- PWR race radiator
- Oil cooler may be front-mounted or a oil/water laminova core (TBD)
- A/C removed

So some questions for the experts here:

- Given the fact that I can set the oil metering rate with a standalone, do I still need to premix?

- Before the engine goes in, are there any useful hp gains to be had with port matching, polishing or anything else without opening up the block?

Jon.

BlitzBoy · February 23, 2010, 03:38:45 PM

No you wont need to premix if you have control over the OMP with your chosen standalone.

No real gains as the 6 port on the Renesis 231bhp engine are already very large, turbo or supercharging it will net bigger gains or bang for buck.
Make sure the ECU you have chosen can control the aux intake ports opening up at a set rpm.

jpc · February 23, 2010, 04:01:09 PM

Quote from: BlitzBoy;674506No you wont need to premix if you have control over the OMP with your chosen standalone.

No real gains as the 6 port on the Renesis 231bhp engine are already very large, turbo or supercharging it will net bigger gains or bang for buck.
Make sure the ECU you have chosen can control the aux intake ports opening up at a set rpm.

Tx for the advice, I\'ll leave the premix then. The ECU has enough outputs available for controlling the inlet manifold.

It is the 6-port version. I \'ve read up what I can and also couldn\'t find much worthwhile to do, I just don\'t want to find out after it\'s gone in. The MX5 bay is pretty small so it won\'t leave many options for exhaust routing which could have helped. Maybe there is still room for a small turbo

Jon.

BlitzBoy · February 23, 2010, 04:38:58 PM

If ya really stuck for space a supercharger will defo fit.
Speedline Imports on here has rotorised his MX5, he has put in a Turbo II rx7 FC lump in, with a bigger turbo, he puts out 237hp odd at the wheels about 290bhp flywheel at only 0.6 bar boost

jpc · February 23, 2010, 04:53:55 PM

Quote from: BlitzBoy;674519If ya really stuck for space a supercharger will defo fit.
Speedline Imports on here has rotorised his MX5, he has put in a Turbo II rx7 FC lump in, with a bigger turbo, he puts out 237hp odd at the wheels about 290bhp flywheel at only 0.6 bar boost

The new engine should be fitted up any day now so I should be able to see what space is left over. I think the Renesis may get to almost 200hp at the wheels with decat and 99 octane which is the equivalent power-weight ratio of an rx7 with 260hp at the wheels so it won\'t be slow.

Jon.

Speedline Imports · February 23, 2010, 05:15:00 PM

Its 262 rwhp @ 0.4bar Blitzy baby!

Jon, look forward to updates both here and on mx5nutz

Martin

BlitzBoy · February 23, 2010, 10:49:48 PM

wooops, more poweeeerrr then i thought

Will66 · February 26, 2010, 03:29:37 AM

Apparently, from what I have read anyway, the gains from Porting on the Renesis are to be had from changes to the exhaust port rather than the intake which are very large anyway.

How are you controlling the induction system? It\'s not the simplest of beasts and will limit your power if it\'s not working properly.

jpc · February 26, 2010, 07:56:13 AM

Quote from: Will66;675218Apparently, from what I have read anyway, the
How are you controlling the induction system? It\'s not the simplest of beasts and will limit your power if it\'s not working properly.

WGT have used a standalone (DTA?) on a Renesis engine before and said it wouldn\'t be a problem, I didn\'t ask the details but will find out and report back.

Jon.

seanp · March 01, 2010, 04:56:40 PM

I suppose for the ultimate porting of a RENESIS would be to drill through those peripheral ports still cast into the rotor casings... 8-)

m1tch · March 01, 2010, 06:55:42 PM

Quote from: Speedline Imports;674526Its 262 rwhp @ 0.4bar Blitzy baby!

Jon, look forward to updates both here and on mx5nutz

Martin

Quote from: BlitzBoy;674650wooops, more poweeeerrr then i thought

He bolted on my Garrett T04 from a truck

RX-8888 · May 14, 2010, 08:17:32 PM

YES, I thoroughly recommend you Pre-Mix if you are using Series 1 RENESIS, remember they have NO Centre (Middle) Oil Weeper Nozzle (via MOP), Series 2 Does (2009~).
ALL other Rotaries made in the past 25 years have had a middle Nozzle, except RX-8 Series 1.

Part of the many engine failures have been because of poor compressions because Apex seals are wearing because of next to Zero Metered Oil getting to the middle of Apex Seal.

There is a Guy in Australia who has and IS installing a Renny into a NC 2005 MX-5.

http://www.rx8club.com/showthread.php?t=158121

RX-8888 · May 14, 2010, 08:22:46 PM

Oh Yes, there have also seen a few Renny\'s Bridge Ported..
One in South Africa, the other still in progress USA.

DON\'T DO IT.... the guy in South Africa has gone back to stock after engine in/out 5 times.
Bridge has to be perfect, Apex Seal has to be One Piece.....and LUCK.

I know no one who has been successful, yes you can fiddle with the exhaust port a bit...not worth it.

jpc · May 24, 2010, 10:09:02 AM

Quote from: RX-8888;693578YES, I thoroughly recommend you Pre-Mix if you are using Series 1 RENESIS, remember they have NO Centre (Middle)

I had looked into that but WGT recommended just upping the injection rate using the EOMP controller.

Is it reasonable to do a compromise where the oil would just be injected into the fuel tank or fuel lines instead. I\'d rather have an automatic solution than have to get oil out on every fill up.

Regarding porting, WGT are just cleaning up the existing ports rather than making them any bigger.

Jon.

RX-8888 · June 10, 2010, 03:16:03 PM

Quote from: jpc;695403I had looked into that but WGT recommended just upping the injection rate using the EOMP controller.

Is it reasonable to do a compromise where the oil would just be injected into the fuel tank or fuel lines instead. I\'d rather have an automatic solution than have to get oil out on every fill up.

Regarding porting, WGT are just cleaning up the existing ports rather than making them any bigger.

Jon.

Sorry for the late response, upping the injection rate still does not get oil to the middle of the Apex Seal.
Pre-Mix is the only and easiest way, unless you use S2 Rotor Housings, etc, etc, etc.

How is the project coming along?