Hi,

I have a '95 RX7 twin turbo, I recently bought it and the modifications that I can tell of are:

Apexi induction kit
Blitz intercooler
Zigen 5 Exhaust system
Tein suspension set up
Dump Valve
Uprated ECU
EBS III Turbo boost gauge
(I'm not going to bother mentioning the cosmetics)
(I'll gladly check for anything else if you need to know?)

The EBS Turbo boost gauge shows the boost figures as .38 etc etc, when idling it's usually between -.36 to -.40, when the dump valve kicks in it knocks as low as -.50

I have 2 main questions regarding the Turbo, boost values, and what this EBS actually does:

(1) There are three settings on the EBS, the first one just shows the current boost, the second one shows (what I assume is) what the boost can be set at (currently .62) and a third one which is just showing 0.00 - I have NO idea what this is and would love to know.

(2) I saw on the forums somewhere that the boost should be set to standard, which is .70, so I changed the .62 to .70, and these are my results:

When I am full throttle through the gears, the max boost I ever hit is around .58, then there's a considerable drop (around 6,000rpm) to .48, and slowly ticks down (.47, .46, .45) any idea why this is happening? The thing to note is that even though these figures tick down, there is a very impressive increase in power delivery at this point...

I would appreciate a response to this,

Thanks,

Pwantwan.

 

Boost falling off as the rpms raise tends to indicate a clogged catalytic converter. Does your car have a pre-cat or a downpipe? If it has a pre-cat, I would replace that with a downpipe. You can replace your main-cat with a hi-flow cat.

Please read through the links in the newbie sticky as they provide lots of good info.

Welcome to the club!

 

How do I find out which it is?

Also: Anyone have any info on the EBS III?

Thanks,

Pwantwan.

 

probably a vac leak as .48 bar is a bit low (aprox. 7lbs). Stock is 10 i believe.

It is common to loose a bit of boost on high end b/c they can't breath and choke themselves. This is usually see in high boost levels though.

those vac readings at ilde are a little low (atleast form a TII level) which would point to another vac leak. How is your idle.......FD's idle so much better than TII........ i couldn't beleive my FD was even running and idl'n with the vac leak it had. But if you have bouncing idles that's another sign.

 

couple of questions.. is it still seq. set up?? also do you have down pipe and midpipe??

what kind of ECU do you have??

your max boost is .58 (less than 8.5psi).. so, I say something is wrong.. you should get 10-8-10 stock.. Check your lines.. also have you checked primary boost vs. secondary boost and their max??.. I would check that and post back.. I had all kinds of boost problems and I'm starting to know little bit.. i'll try to help..

 

Thanks for the response guys, I really do appreciate this, I've got some information to pass on:

I do still have a seq setup. I have a Knight Sport 4beat FD set up (Someone please tell me what this is????), and a Knight sports EBS III Ecu and boost stabilizer. I also know I have a Blitz intercooler, and a full Zigen 5 exhaust set up, if you can give me instructions where I can check other things, I'll gladly go check and take photos.

ONE IMPORTANT THING TO NOTE:
Today I realised the boost controller wasn't turned on, so I pressed the power button, and boost levels are as they should be, I get .72, down to .62, then back up to .68 (that's when I set it to .66, I have the option to increase that but I'd rather be safe for now?)

- - - Why would the boost values have dropped so dramatically without the boost stabilizer turned on? Is this bad? Or is this normal? Things seem to work impressively well with the boost stabilizer turned on now...

Thanks in advanced guys,

Pwantwan.

 

That's normal. When the boost controller is turned off your wastegate is fully opened on boost, which yields 7 psi. I'd keep your boost at right around 0.70 (~10 psi)......

 

Hah, glad it worked out for you. Nice when it's something simple. When I first got my boost controller, I did the same thing and left it off and wondered what the hell happened to my boost. Things like that can happen to the best of us...

 

Also, good to hear.. I hate when you check things for hours and realize it was something simple as just turning something on..

 

guys, thanks for all your help, I am very reassured by your help and also I am very pleased with the performance of the car now, everything is spot on perfect, again, thanks: I'm going to attach a picture of my engine bay head on, does all this seem fairly normal conversions? Is there anything you recommend I do fairly soon?:




Thanks,

Pwantwan.