uk_rk7_owner

I have recently bought a 92 3rd gen rx7. the previous owner told me the clutch was going. I did notice this when i was test driving it as it took quite a bit of gas in first to get it to move. and when reversing also required a lot of accelerator.

Now i have noticec when i put my foot fown in any gear at speed it makes a lot of noise but dosnt pull or accelerate.

I hope it is the clutch cause the guy included a new replacement one that he is sending to me as part of the sale.

also I get a lot of popping and loud explosions from the exhaust when a certain ammount of revs is reached and when reversing and also when i reach a certain amount of revs its like i get a fuel cot or something is that normal?

I got an apex exhaust, ms induction kit and recirculating dump valves. there is a possibly a cat bypass as well (i didnt put that on but it was in the reciepts for work done that the guy gave me)

The car was serviced in january and had all the pipes changed and a new battery and oil and coolant changed.

Sorry for the long windidness of this post. i am new to the rx7 game and am clueless when it comes to cars.

anyhelp will be much appreciated.

Howard Coleman

iTrader: (6)

welcome to the club

it sounds like you have some serious issues w yr clutch package. among them:

your clutch disc is either shredded or glazed and will need to be replaced.
your pressure plate's friction surface may be glazed, overheated and may also need to be replaced.
your flywheel could be cracked from the amount of heat generated by the aforemantioned slippage. be sure to check it.

the good news:
unless you are making over 350 rwhp the stock oem pressure plate is excellent and can be purchased used in good condition for a song using the classifieds on this forum. buy a new oem clutch disc. if your flywheel is cracked buy used off the classifieds.

everyone junks their stock stuff and bolts on aftermarket creating lots of low cost availabilty and the oem Daikin pieces are excellent. or just buy new oem.

if you are planning lots of mods the act or spec product work well.

the popping sound is something you need to deal with. it could result in a terminal motor condition. for instance, it could be a dirty fuel filter which is at the top of the maintainence list. if you don't know the fuel filter was changed... change it today. (could also be plugs)

the fd is a super car. it requires an understanding of it's mechanical quirks and some rejiggering to address same. if you don't do the homework so as to understand the car and it's required feeding you will have an unhappy experience.

it is all here on this forum so do your homework and you will be a happy guy.

howard coleman

uk_rk7_owner

I spoke to one of my friends about the popping sound and he said it is because my fuel is running rich.

I have read a lot of past forums and seen that it is better that your engine runs rich.

Could that be the cause of the bangs comming from the exhaust?

Itr only happens when the car is reved hardish when reversing or at high revs.

I have got a boost guage on the car but i cant watch it and the road at the same time. (concentrating too hard for cars pulling out and whatch peoples reactions :-)) I notice when the car is idling the gauge reads about -0.5 but then rises when i put the car in gear and drive off.

Does the guage need recalibrating or something or is it doing the opposite of boosting when idle.

cheers.

(new owner)

PVerdieck

If you are running rich, then the car will backfire, because of unburnt fuel.

Normal boost operation is to run negative at idle/low load conditions. Once you rev above 3000, then the boost increases. What you need to do, if find out the boost pattern. Find a good section of highway where you can pull a small speed run. You want to get 3 boost readings. These are max 1st turbo, a decrease at transition, then max 2nd turbo. In psi, a good car would have 10-8-10.

That is 10 psi 4000-5400 rpms, then a dip for transition down to 8, then the 2nd turbo is spooling and it should
go back to 10 psi. Then you can back off.

I don't know what those readings would be in bars.

uk_rk7_owner

just got the metric conversion for bars to psi and it is the number of bars multiplied by 14.5.

I will have to wait till i get the clutch replaced before i can truly test to see if the ratios are good.

I have found this forum really useful and wicsh i had known about it long before i bought the car (bought it friday)

I would have still bought an rx7 but i would have been able to make a more informed choice about what is a good and what is bad.

Its a nice looking car, bomex mody kit, apex exhaust, ap racing black alloys 17inch with red around the edge and low profiles. sounds amazing and gets attention everywhere i go. and the spoiler looks really hot. (black alluminium)

The precat is still on the car and after doing a lot of reading in these forums i can see that i will have to replace that with a down pipe. what sort of price would i be looking at and i understand that once i have done that the ecu will need to be changed also. I have been thinking about the standalone system but then i dont know if i need to go to that extreme cause i am prety happy with the performance so far except for the fact that i need a new clutch.

I am stil not sure what type of oil to use on the car. i read you should use 10w30 mineral oil but i think when the car was serviced they used castrol synthetic oil. i understand that the natural oil burns where as synthetic oil dosnt and that can effect the seals. if i need to be using mineral oil i take it an oil change will be neccessary.

cheers again

Howard Coleman

iTrader: (6)

your synthetic is fine... i run mobil one synthetic. the only time i use non synthetic is during the first 1000 miles on a new engine.

howard coleman

Toadman

Welcome to the forum! Let's see some pics!

uk_rk7_owner

Hey people

I have found the information you have given me very useful. i will get some pictures online very soon.

These cars are serious machines, on saturday i learnt why you have to respect them when i pulled out of a side street with a little to much gas and felt the back of the car slip out from underneath me :-)

Learnt my lesson and fortunatly recovered the snake quite well.

awsome power.

Is the rx8 better than the rx7. my friend rekons that they have the potential to be better (faster cpu etc...)

I dont think so though cause i rekon they will have toned them down to meet the general car drivers need.

whats the standard bhp on them as well.

I prefer the look and the exclusiveness of the rx7s by far.

My one concern though is that i dont think i will be able t drive a standard car after this experience. I am a true sports car fanatic now. i have been converted :-)

Ciretose

I can agree with uk's last post, I sold my sports car, and had no idea how much I would miss it, I am definitely experiencing withdrawal symptoms. I am hoping that a good dose of boosted rotary power will help smooth them out.

particleeffect

slap him in the face. heh. better? well that depends on what the heck you mean by better. if you mean faster then heck NO. the rx8 is slower and has much less power potential than it's turbocharged rx7 siblings. unless you are building a huge displacement high compression motor, lower compression forced induction applications almost always have more power potential.

-edit the power on the stock 8's is slightly less than stock 92-95 fd's. of course we can make considerably more with intake/exhaust/fuel mapping/f-pump
and intercooler. that should net you ~340rwhp, and then you can get a bigger single turbo and new fuel injectors and get into the 400's without much fuss. (you'll probably need a new clutch to hold the power).

anyway, check the fuel filter and replace the plugs but backfire on a rotary is normal. even naturally aspirated ones seem to like to backfire.

RX7Wishing

loud explosions from exhuast... lmao.. nuts!