Prophet7000

The double throttle removal just cleans up the intake track and supposedly can increase flow. The decision to remove it is up to you, but many people do it without ill effects.

http://www.rx7.org/Robinette/double_throttle.htm (great website lots of stuff on here)

The only change I made to this writeup is to tap the hole left in the UIM and put in a threaded bolt with red loctite (with the UIM completely off to make sure shavings don't get into the engine). The thought of having a nut that can come loose and drop into the UIM then to the engine made me cringe.

Prophet7000

1st pic - say hello to your stock BOV, since you can hear the pressure release I'm assuming that the big hose coming out of it goes to nowhere.

2nd pic - stock fuel pressure regulator I believe

3rd pic - looks like an O2 sensor but I don't recognize what it's in. Do you have the stock precat on your car?

dhays

iTrader: (1)

Hard for me to locate where it is in the shot, but if this isn't your CRV then it is the BOV. They look essentially the same.

sickboy2345

sorry i should have pointed things first , just looked at it now, went to the car and got confused myself...now better pic with the smaller pic in it to show where it is in the car, btw: the thing you said is CRV actually says CRV on it just spotted it now when i went to take some more pics...



its behind the crv and it hasn't got any big rubber hose coming out of it , just two or three small ones .

2

sorry but what is precat? and how do i know if i got one?

3
just today went to buy this rubber cap for the airpump pipe, i've taken this silver tape off, drilled the cap and took my car for a spin....engine got really hot...as always but look what happened to the cap..:



it melted... what cap did you use?

btw:
need to read more about removing Double Throttle but i'm gonna do it

Prophet7000

That is not the stock BOV. The BOV/ABV looks absolutely identical to the CRV (2 big hoses going in and out, 1 small vacuum line). If they weren't marked you'd never be able to tell. Do you have an aftermarket one by chance?

The precat is a catayltic converter in the downpipe right after the turbos heading towards the rear of the car. If you've got an aftermarket downpipe then it's been deleted.

1QWIK7

iTrader: (33)

Look under your car and you will notice a pipe that runs upwards towards the engine bay. Refer to this pic.



You can only have 1 style or another. The top pipe is the pre-cat, the bottom is an actual 3" downpipe.


I find it hard to believe that has happened. I put in my rubber cap 2 years ago and it looks like i just put it in today.

I used a heavy duty rubber cap for a wooden chair or table. I got it from a hardware store. Your cap looks like a cheap generic but i dont see a difference as why yours will melt unless yours is really cheap and thin. My cap is really thick. Go to a hardware store and ASK for a cap for a wooden table or chair, they will give you a good one. Bring in the bad cap so you can get the right size.


No offense but if you cant figure out the EASY nik nacks of these cars, i wont recommend tackling another mod like double throttle. Although its easy, i suggest fixing the problems you have now and enjoy the car. As you learn more, then start doing more. Dont just do things now since you're fixing stuff now. Although that may be smart technically, in your case, you just need to get the car in correct shape so you can drive it correctly.

sickboy2345

i dont think so...i think i would recognize it...tommorow i'll take a pic af my engine bay and ill post it here...please tell me if you can see it...


1QWIK7

thx for the pic, ill have a look tommorow and see what i've got...


oh and what i did about the cap was, i went to one new-found-car-parts store and found a little breather filter, installed it on the air pump and that replaced the melted cap with this thingy i had on the airpump before..dont know how it works coz i cant drive my car yet (no brakes see my other post ) but in the meantim ill try to find a right rubber cap...

btw:
i took one of my mates for a spin two days agoi and even he said that "my bov sounds really nice" i cant believe i havent got it...where would the sound come from? once i get my brakes done i will record a video of my driving and you'll hear it ..

GoodfellaFD3S

iTrader: (213)

In the pic, the thing you think might be a BOV is the EGR valve, it's bolted to the LIM.

I'd really, really recommend you bring the car to a rotary-smart shop. You're in way over your head, no offense

Prophet7000

Well toss up a pic and we'll see what's what.

sickboy2345

GoodfellaFD3S

Non taken mate -i'm just trying to get done as much as i can, want to learn something about it, if i **** it up...well then i'll do what you just reccomended


ok pics of my engine bay - im starting to think i havent got this BOV but i cant understand where would the sound be coming from...

sickboy2345

and my downpipe/decat search(cant really look undearneath - so i had to put my camera there and take some pics )









btw: this looks like a broken cable - what is it for?

Eggie

Wow - I've never seen an exhaust held together with a lugnut before!

Uncle Hungry

iTrader: (2)

lol nice!

sickboy2345

????????????????????????

yellow93

bolts is miss from the steering shaft

Prophet7000

So first pic - holes in the IC shroud should be covered up. Air is just sneaking around the IC instead of just going through.

Is your A/C deleted completely? Without the canister (which is typically sitting in the right hole in the IC shroud) it isn't working of course, but why are the lines still there? Are the compressor/condensor gone?

Post #36, 1st pic with CRV in it - You see the hose in the bottom right of that pic coming out of the dead center/crook of the Y-pipe? That hose is the one that has the BOV/ABV in it in stock form. Follow the hose and see if you find the BOV. It may be routed down towards the bottom of the car and hard to see.

Post #36, 3rd pic - The silver fastener is actually a lugnut holding your exhaust together. That's what the guys were talking about. Also looks like you have a precat.

The snapped cable just looks like a grounding strap.

sickboy2345

could you please tell me where is this missing bolt? which picture?

Prophet7000
my AC has been disconnected, guy who had it before me bought a chassis and the just had the engine fitted, he didnt know who did this either..what i suspect was that someone removed the AC and tried to fit the diffrent one afterwards(or maybe my guy tried to fit a different one..)

dont know but if you look here

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/bad-pulley-755336/

you will see that the ac compressor is still there and it cuts my drive belt(it doesnt anymore as the belt got smaller) because the pulley on it is more narrow then other ones and the belt is too big...

im assuming that everything else is still there, i have asked mazda to remove it but they want 600 pounds for it which i'm not gonna spend on it as for this kinda money i can have something for my car (saving for FMIC)

they r the closest garage who actually agreed to work on my car (other ones dont touch rotarys) and they charge 90 pounds an hour so ill go back there when i really have to(went there to replace gearbox rear seal,exhaust gasket and they actually rescued me when my car was in the limp mode)

once i get back home(im in scotland- working ) ill have some tim e and i will try to find some posts about A/C removal as i will have to do it myself once i find someone who will allow me to use his jack lift(or maybe there is a way to do it from the engine bay????) i heard that its not difficult(4 bolts and then remove all the pipes or something - like i said i need to find out more before i decide anything)

if i cant find anything ill post a new one about it...

i will also check the pipe for BOV u pointed out and blank off the holes i got there - everything on saturday unfortunately, so could you please check this post again?

i would appriciate it...got my internet connection here (which i cant use much cos they charge like for a spaceship)and nothing else apert from it..

cheers

Prophet7000

First you'll have to decide whether you want to keep the A/C or not. I'm not sure about the weather in the UK, but I personally go without, though I get lots of complaints. If you do want to keep it, maybe a new pulley would take care of it or just source a used A/C compressor from someone who's scrapping theirs. If you're going to trash it, the removal isn't hard assuming you've got the right tools (eg. ratchets and ratcheting box wrenches). Just read up on it before diving in. Judging from your other posts, I'd say it would be a smart idea to read up and ask any/all questions you have before diving in. Feel free to pm me if you have any pressing questions.

sickboy2345

prophet i think u was right... ain't got no BOV.. dont know why but i wanted to follow the hose u pointed..:



you can see it here under intake pipe:





see this cap?that is the thing that looke like pipe no BOV but i still cant understand how it was making the sound...would CRV do it? it doesnt do it all the time..only sometimes...tried to record it today but didt work...

btw this was under the second intake: what is it?



intercooler ducting holes have been covered but i will probably but fmic in july(i hope so)

+

i think i need BOV

posted another topic regarding that issue...

KKMpunkrock2011

iTrader: (5)

damn, this has been helpful to more than just you sickboy, I just got my car a few weeks ago, and I didn't think they had a BOV, just the wastegate, but now I'm gonna have to go home and search for it when I get off work in an hour

Eggie

Looks like the wastegate actuator. And that's the primary turbo/intake.

Sickboy, you really need to spend some time reading the FSM, stickies, etc.

Prophet7000

BOV and wastegates have two different jobs.

Wastegate - Controls boost levels by allowing air to bypass the turbo(s) stopping you from overboosting. Can be internal (part of the turbo like in our stock form) or external like the Tial wastegates seen on many single turbo kits. The wastegate can be routed either back into the exhaust or can be externally vented. Having a wastegate that is too small to handle the amount of air flow in your setup leads to overboosting at the top end called boost creep (this can be fixed by either porting the wastegate to increase its size or decreasing the flow of your setup by adding exhaust restriction).

BOV - After positive boost pressure is produced, when you shut the throttle plates (eg. shifting) the boost has to go somewhere. Without a BOV or bypass valve, the air rushes back to the turbos attempting to push the fins in the opposite direction causing what is known as compressor surge. With a BOV, the extra pressure is harmlessly released.

sickboy2345

ok another quick one...

my wheel arch is knackered(nearside) it was dangling on a piece of plastic so i ripped it off...the question is: can i drive it without it till i get a new one? does it affect anything?

i found one thing behind it, looks like a little IC what is it? is it an oil cooler by any chance? is right next to the washer bottle..

1QWIK7

iTrader: (33)

Look through the side vents of your bumper, if you see small IC looking things, then yes that is your oil cooler.

I have dual so theres one on each side. IM not entirely sure which side an oil cooler is if you only have 1.

But they are soo easy to point out, im sure you will know.

KKMpunkrock2011

iTrader: (5)

yeah, I know what each of them do, I'm not a total noob to turbos, but I read somewhere that FD's didn't have them, even though it made no sense why they wouldn't