danrudd

I'm totally new to the world of the wankel, I picked up a twin turbo '93 rx7 yesterday and have a few (hopefully) simple questions.
Firstly, I understand that the engine is supposed to run on 10/40 mineral oil. I work for an automotive consultancy firm and get pretty much any oil for next to nothing except we only get semi synthetic of fully synthetic oils. Would a semi synthetic be ok?
Also should I be using a specific coolant?
There also seems to be a bit of a coolant fault on this car I've bought. From what I can see there are three coolant filler caps and the centre one keeps running low and a warning buzzer sounds inside the car, which i then immediately stop. This has happened twice over about 120 miles?? It appears to be leaking from somewhere around the expansion tank area. There is absolutely no mayo in the oil filler cap and the car doesnt smoke.
Also the boost on the second turbo seems pretty weak compared to other rx7's I've driven, any ideas??
The car is totally standard by the way, and i also drove some other standard ones to compare it to.

Hope you can help

AMRAAM4

How did you find a twin turbo model 93??????


Your questions are very vague or asked millions of times. It is best to read and search A LOT before beginning to post on these boards. I think i feel pretty confident in saying though, that I have no idea who you heard the 10/40 mineral oil crap from.

RX7Wishing

FAQ for 3rd Gen & other useful links

--------------------------------------------------------------------------------

Links for the future FD owners..

http://robrobinette.com/

http://www.scuderiaciriani.com/rx7/index.html


You will see that those 2 links above will cover most of the basics of the FD...model differences, reliability, ETC ETC.

Want parts ? But maybe not from the dealers...check here :

http://www.mazdaformance.com/rx7parts.htm


Please dont forget to search the archive...lots of useful info there too before posting a new thread..such as :
AST vs No AST
Boost issues
Model differences
as well as performance products that other forum members have..

Now the description of this section states it is for performance modifications and technical discussions...so please resist the urge to post links to things like EBAY making fun of someone's car...no matter how terrible, or other trivial dribble Please use the appropiate sections when making threads....



Copied fromt he Noobies thread.. Check out the stickies at the top of the forum. They are full of usefull information for new owners.

alberto_mg

Some people would debate whether or not it is OK. I think it would depend on the oil. I would suggest searching on "synthetic oil" to read the debates and also check out the links in the FAQs for info and make your own decision. It's probably better to run 20/50 during hotter months and the lighter oild in the winter.


That is worrisome mate. Do you have a good rotary specialist near you at all? It could either be something simple like a broken AST or it could be the engine's coolant seals are on the way out. How many miles on the motor?


Boost issues are hard to troubleshoot. Refer to the FAQs for some good links. It's probably one of the vacuum hoses. Possibly one of the 4 that go under the crossover pipe.

Good luck.

hardbodeez

iTrader: (4)

From Soho down to Brighton, you must have played them all.

danrudd

The motor has apparently only done 40k miles. I'm getting it checked out on tuesday by an rx7 specialist, so I'm going to be keeping my fingers crossed.
Thanks for your help, sorry to be asking silly questions I'm sure you have all heard millions of times!

dgeesaman

iTrader: (7)

Just use a good oil. Modern sythetics burn cleaner than older ones, and it's a little extra peace of mind for the turbos, although they generally never have coking problems (water cooling helps). 15w-50 or 20-50 is best if you're not driving it in subfreezing conditions since after a few hundred miles fuel dilution tends to thin it further.

Coolant is coolant. Unless you want to switch to Evans (don't bother unless you need to), it's a simple issue. I run 50/50 with distilled water here in the NE USA. Which Brighton are you in?

The coolant consumption/leaking might be a bad pressure cap on your AST, a leaking hose, or signs of a dying motor. I hope it doesn't end up that the seller knew this and still got full price on the car. It's also why buying this car without any research is a very bad idea.

You need a boost gauge to do an effective job of finding the turbo problem. In fact, go ahead and also order a Mityvac Silverline Plus vacuum/pressure kit too. You won't regret it. Once you have the boost pattern, you can use the Mityvac to test the actuators and solenoids, and use it to tee into the system and troubleshoot its operation. I hope you have patience for diagnosing complicated systems -because this is one.

Check out the newbie sticky thread at the top of this forum. Most of these subjects are covered well. Get started thinking about reliability mods - these cars will last longer with fewer breakdowns if you install them before they break.

Dave

danrudd

I'm in the south of England Brighton (Sussex).
I got the car pretty cheap actually, so I'm expecting to spend a fair bit on it and still be better off. I also enjoy a challenge!!
Thanks for your help.

PhoenixDownVII

You wouldn't be the first person to have a cracked or bad overflow tank.

Replace it or at least check for leaks in that area. Doubt it's a coolant seal.

AlexJT

Thanks rx7 wishing after checking out that site I found a couple of quick fixes that have been bothering me about my 7. Hopefully Dan got his cherry popped with all this info I know I learned a couple new tricks.

Force13B

iTrader: (19)

Make sure you don't still have the plastic tank, and it should be a 16psi cap on it. As for the oil 2 rotor shops told me to use regular 20w50. There are a few threds debating this but

BATMAN

I've been to Brighton, MI.

Lot's of hots girls. Tall ones at that.

I run Synthetic oil everywhere.

Never had any issues.

Nay sayers of synthetic are usually talking from ignorance, not from 400k+ miles (on 2 rx7s) of real world usage.