skc

Learnt something new after speaking with the tuner. It appears when the needle on the temp dial starts moving the ecu starts injecting extra fuel to help cool things down. When I was at the track I noticed that the car was bogging under hard acceleration whenever the temp needle moved from its usual spot.

When the engine cooled down it would work fine. Is this feature built into every car or was it programmed by the tuner.

olddragger

iTrader: (3)

i think that was entered by the tuner?
I havn't heard of this being in the oem profile..but IDK for sure.
Some have even continued to inject fuel ( impulse or two) after throttle closure to cool things. Thats pretty radical to me..

skc

Danny had an open day at his workshop yesterday. His collection of old rotries is fantastic. His shop has also done a LS1 conversion for a track only car producing 280kw.

Danny has been also busy getting a HKS kit ready for his road going MX5. He will now take it to the track and push it to the limits. If it passes all the tests HKS will be marketing it as a kit.

Danny plans on having his Hymee kit fitted by the end of the year with a goal of getting 400HP. I will be following with interest as I hope to benefit from the upgrades. He will then concentrate on the track rotary NC with the 2.6L Hymee supercharger.

olddragger

iTrader: (3)

2.6!! Holey Moley mate---no problems getting enough air for 400rwhp with that one.
We have one guy that is experimenting with a 2.1 ( Pettits is a 1.7) and he is almost at the 200 load by 3K rpms!i

skc

He will be aiming for 400HP out of the 2.1L and then aim higher with the 2.6L.

To get 400hp pot of the 2.1L he may have to spin around 17psi. His engine has been ported, 3mm ceramic seals and many other upgrades so the engine should be able to handle the power.

I will be following with interest.

WingleBeast

How will the 2.6 fit?! Better see some pics!

skc

The 2.6 is going in the MX5 with a renesis engine. The firewall has a curve where the supercharger unit sits and still has a lot of clearance.

skc

Had a few recent dramas with a faulty pre cat O2 sensor causing the fuel pump to cut out due to blown fuse. The sensor has been replaced however, the car had a couple of backfires when under moderate load.

If the car was tuned on an ageing sensor would adding a new sensor cause the car to run lean.

Car seems to run smoothly at idle and while cruising

olddragger

iTrader: (3)

it is possible. the tuner may have used there own o2 sensor while tuning, but if he was relying on the cars, then the tune is based on that sensors readings.
One hint--ALWAYS have a big fan that also blows UNDER the car some while on the dyno. If you dont the o2 sensor will get too hot.

skc

Running better today after filling fresh fuel. Still reluctant to drive at full boost so I will refrain from pushing harder till later in the week.

skc

More dramas over the last couple of days over the EGI Comp 1 fuse. Got a second hand sensor after it appeared that the new one had failed. This got the engine going however it also failed after 10 minutes.

This time the car would not start after removing the sensor from the harness. A closer look at the harness has revealed that there some melted harness wires under the compressor. The only way to get to these is by removing the compressor and having a look at the condition of the wires.

I will also have to look into getting some heat shield around the harness to prevent this problem from recurring.

This issue has been frustrating and expensive so far. I have also been stranded on the side of a busy road trying to fix the issue. Luckily I managed to get going after disconnecting the the 02 sensor.

skc

Found this website with a comprehensive build journal of the Hymee kit. Very impressive record of every minor detail.

RX-8 Hymee Supercharger Install

Not sure if he is a regular on this forum.

olddragger

iTrader: (3)

its the little things that drive you crazy.
That link doesnt work for me.

skc

The website must be having technical issues as it stopped working for me as well.

skc

Took the car to Danny's shop. Pulled out the supercharger and found that the wiring harness leading to the transmission had damaged wires and causing a short. These will be repaired and possibly rerouted so it does not touch the compressor.

While the compressor is out we will get new blue injectors installed for more capacity down the track.

olddragger

iTrader: (3)

Good deal--have them flow tested also?
You really dont need the ssv or vdi valves in the intake..........

skc

The wiring harness is in a bad condition due to the engine bay heat. When new they are flexible and can be moved around however once it is set in place the harness hardens and the outer plastic covering cracks. The heat is also effecting the coating around the individual wires thus causing it to break up as well.

I can take a risk and fix the effected area and hope for the best or replace the engine wiring harness. I have chosen the latter option which is quite expensive however, I feel that it is going to be necessary. Jason at automotive plus had some used harness however with only 40 000km they where also showing signs of going brittle. So new harness wires have been ordered and should arrive on Monday.

I am now looking at over $3k including 4 new injectors to get the car back on the road.

olddragger

iTrader: (3)

Whoa---by a good used harness instead. Check with mazmart , paul may can save you a lot of money. Once you get it --place the appropiate heat shields on them and make the connectors more secure.

WingleBeast

shrink tubing resistant to heat is cheep and plentiful, easy, and cosmetically improvement over the black plastic tubeing

skc

I could have saved a bit of money by purchaseing through Mazmart however, I got the harness for around $1100.00 so the cost differential was small and i will not have to wait as long.

Second hand harness was available however, as we now propose to move the harness to where the injectors are the older harnesses are not as pliable as a new one. Bending old harness risks breaks to wires and a further wiring shorts.

The oem position of the wiring harness leading to the transmission tunnel is not ideal especially when you have a supercharger compressor sitting on top. That side of the engine is also hotter as it is the combustion side. Hopefully, moving it to the "colder"side will help. We will also get it wrapped with a heat shield for extra protection.

olddragger

iTrader: (3)

sounds like this project is well thought out.
Good luck with it and I am sure your engine will be purring soon!

skc

I am told that the reinstall has been successful oil leaks have been fixed. The tuner will get the car this afternoon to dial in the in the new injectors.

Not sure if the larger injectors will make more power however, it should make it easier to scale up in the future.

shr3da

Did they remove the engine to tighten up the bolts, regarding the oil leak?

skc

Fortunately, the fix was easier than first envisaged. As it turned out the fitting attached on the drain line was lose due to a stripped thread. This fitting has now been welded. This also makes tightening the oil lines easier.

skc

Car is finally back and running well. However, it seems down on power. I have had several issues such as boost leaks, and problems with the by pass valve and then finally the electrical short causing the fuel to be cut due to blown fuse.

I also saw the water temp gauge move at the last track day and this could also have caused some damage.

I think over time these issues have taken a toll on the already stressed motor from seven years of track days. The tuner has reported a steady drop in power from a high of 195kw down to 175kw.

While the still runs fine I will restrain from track activities and try and streatch the inevitable rebuild for another 12 months if possible.

The plan will be to crate the engine to extreme rotatries for a comprehensive rebuild.