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Cars > Jims5543’s Garage > Blog > 1987 Mazda RX7 (Black Sunshine)


Jims5543’s Profile Photo


M –52
Jensen Beach, Florida
United States


I have declared the break in done.

By Jims5543

Filed under: 1987 Mazda RX7 (Black Sunshine)

I am boosting at will and just staying clear of redline. I am not taking it over 6K RPM for the next week or 2 and will finish cleaning up the maps to 6K then work on the 6-8K maps.

I had to try WOT in second gear again on a warmer afternoon with warm tires to see if I was imagining the other morning. It was about 82° out and I had driven her for a good 30 miles so I figured lets open her up again.

I turned onto a 4 lane road that was empty and nailed it in 2nd gear at around 3K RPMS and took it to 6K. She practically jumped off the ground. Once she hit 4500 RPM the back tires gave up the fight for traction and she began fishtailing ever so slightly as she rocketed to 6K RPM.

I shifted to 4th and calmly drove about another 1/2 mile as I collected myself, then I just uttered the word...f*@k.... and drove on. That was the only word to describe it.

This is going to take a lot of getting used to. For the first time since I have owned this car, I feel like it could easily kill me. It not that I do not like this feeling its kind of a rush, it just I have developed a whole new respect for this car and a quiet fear.

I was pretty sure it WAS a 10 second car before this break in, my butt dyno says there is easily another 100HP in her now. Could this car possibly be a 9 second car now. Could I have finally hit my elusive 500RWHP? I hope to dyno it in the next month or so. I am really looking forward to Autocrossing it again now.

I am considering some Kumho MX tires for her now since my Yoko A032R's are just about done. I have never really been impressed with the grip these tires offered. Plus now that the rears are almost bald I am going to need to treaded tires for a drive to NC.

I will try to shoot some crappy video of it at WOT in 2nd and 3rd gear soon so you can see the insanity.

The last project I have now, I have a turbo blanket on its way here from Titan Motorsports, I just picked up some header wrap for the downpipe and I am going to insulate the turbo, its throwing a lot of heat into the engine bay.

Nearing engine break in completion.

By Jims5543

Filed under: 1987 Mazda RX7 (Black Sunshine)

I considered tearing up a 2004 Mustang GT this morning that was paying with me. I was sure I could do it short shifting and boosting to 7 lbs. I passed it would have been fun though, this car is such a sleeper, its almost comical when a muscle car steps up.

I decided in an effort to get this crap over with the last 400 miles +/- will be done at interstate speeds of 70-100 MPH.

I did 100 miles this morning in about 1.3 hours. Very Happy

I got out late, and hope to get out earlier tomorrow and get more like 200 miles on her, then as far as I am concerned I am done.

I want to tune to redline Friday afternoon or Saturday morning.

All I can say is with the porting work, and this new turbo..... holy crap!!

I am looking forward to opening her up soon. This car warps your sense of what fast is.

i.e. my 3.6 swapped 911, I though it was slow and found out it was probably a 12 second car. My rx7 in its old trip was probably a 10 second car and was brutally fast. If I floor it, it feels like it is leaving the ground.

I am nervous about mountain runs because I am afraid this car will get me in over my head in about 0.0002 seconds.

Self control is going to be the key.

600 miles left!!

By Jims5543

Filed under: 1987 Mazda RX7 (Black Sunshine)

Another 200 miles down, and it seems like 19MPG is becoming the norm for the car. I am hoping for more in the 20's when I drive her up to NC in the spring so I can get some range out of her. When the gas light comes on I have 2 gallons left in my 14 gallon tank. If I can get 22 MPG on 12 gallons of gas that will give me a 264 mile range. Which is the same as my FJ.

It was a very uneventful drive through the Sugar lands of Florida. Pictures soon.

I gave her 1/2 throttle in second gear this morning and she urned sideways on me in a flash, it seems like this turbo spools up much faster than the old one. The power pours on fast and hard.

I did a stint along the Northeast side of the lake where I was doing 90-100 on empty roads with no one in sight.

Most of the time I was cruising along at 70-80 MPH, on very empty roads.

The little towns along the west side of the lake (Moore Haven, Lakeport and Buckhead Ridge) were pretty rough little towns, although Buckhead had a peculiar charm to it as I rode through it.

It was very cool this morning but, as I got back into Stuart it warmed up nice enough to roll both windows down and open the sunroof.

The car ran like a champ, my only concern the whole drive was the oil pressure seemed high, but then I remembered I was running 20/50 in it now so that is probably contributing to the added pressure.

I have to check the mileage but I am heading towards the home stretch. I hope to be doing some more street tuning with my mechanic / friend next weekend.

19 MPG!!!

By Jims5543

Filed under: 1987 Mazda RX7 (Black Sunshine)

19 MPG!! say it!! 19 MPG!! was as blown away this morning when I filled up the RX7 and went 180 miles on 9.5 gallons of gas.

I am past the 1100 mile mark and did another oil change this morning.

I have tweeked the maps a little more and I am amazed how fast the turbo spools, even at 1/2 throttle I am seeing full boost at 3K RPM's I suspect at WOT I will see full boost int he high 2K RPM which is just fantastic. This should make for a VERY quick setup.

I unplugged one of the two 11" fans I have on the radiator and I am seeing 170-180 on the engine temps now, before I was only seeing 150-160 and thats just too cool.

Radio has some interference from the engine, well, actually the Sirius is, I bought a insulator from Radio shack today and I am putting it in in the morning. I hope to be able to button up the Intake next week too after the Holiday. I have my new piping and elbow in.

The new engine break in is going smooth.

By Jims5543

Filed under: 1987 Mazda RX7 (Black Sunshine)

I now have 200 miles on the new engine. Its running strong. I had to pull some fuel out of the fuel maps and tweek the timing a bit.

I am surprised how much torque this new engine has with its porting. I know, I know, there is no way a rotary has torque. Well, I took off in second gear this morning (not awake yet) and I have NEVER been able to do that in the past, and I have a 9.5# flywheel now too. On top of that I barely touched the gas.

I filled it up with gas today, tank #1 is done and I am #2 of about 10 tanks I need to run through it before the break in is complete. I got 15MPG and considering the first 50 miles of that tank was pig rich and it was all city driving, I am happy.

I would imagine 20MPG on the highway may not be out of reach.

I had one of our work trucks detailed today in addition I had the RX done up too. I looks a lot better with a coat of wax on it.

I have one A-hole incident, I was driving with my son to a sand castle building fund raiser and some moron in a pick em up truck decided he need to fly up on me and tail gate me for 2 miles. I was in a 40 MPH zone already doing 65 and he had to be doing 80-90 to run up on me like he did. We came up on a traffic circle and I smiled. On the other side of it he was no longer on my bumper and a few buses back. LOL! I may not be able to floor it yet but it can still turn good.

Speaking of which, I had been driving the 911 for so long and with the RX7 off the road so long I forgot how well it cornered.

I went around a traffic circle last night and I was amazed how fast I could take it. This struck me as funny because I used to think the RX7 was a handling nightmare with street tires vs. slicks. Its been too long......

I cannot wait to get the break in done so I can tune her and unleash the GT35R.....


By Jims5543

Filed under: 1987 Mazda RX7 (Black Sunshine)

... and my wallet is empty.

I was impatient, I decided to go dyno the RX7 too early with only 450 miles on the engine. I ended up spinning the rear bearing and cracking an apex seal.

This has worked out for the best because I pulled all the stops. I ordered a GT35R Turbo and upgraded my primary injectors from 550's to 850cc's. I also had the 1300cc secondaries rebuilt and flow tested.

The engine is back together and almost ready for the car. We expect it to be back on the road in Mid October.

With all the fuel system upgrades we did and now the turbo and injector upgrades I am anxious to see how much power it makes.

The streetport work was tweeked while it was apart as well.

I hope to see the Turbo and injectors next week so we can get her together.

I will put 2000 miles on it before I ever think of pushing it, this was a VERY expensive mistake.

My 1st Challenge

By Jims5543

Filed under: 1987 Mazda RX7 (Black Sunshine)

I have no idea how this works but, O.K. I'll play. I have been away a while and really busy.

The RX7 has a brand new engine and is getting ready to be dyno'd we are pushing for 460RWHP. Dyno sheets to come soon along with some Autcross and track footage.

Cars > Jims5543’s Garage > Blog > 1987 Mazda RX7 (Black Sunshine)

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