Boost Controller - Need help installing

[grinder]

this is where it becomes a bit iffy - i dont know what this controller does to to be honest

i was lead to believe that it would only turn boost DOWN ?? ( so that you could turn it down on the motorway )

now im not sure if thats actaually possible or not ??

with regards to over boosting - this is the fun bit ( well OK its not !! )

i will be fitting a Blitz FMCS to the car ( Fuel Management Computer System ) which adjusts the air fuel mix at various revs - this has a built in FCD ( which is adjustable )

i also have a FD pump to fit to the car

aswell as the front decat pipe , then i need to remove the air pump ( dual pully on its way ) and about another 1000 jobs to do on it ( dont get me started on the welding !! )

when i drove the car last ( over 6months ago ) - it used to spike to about 6psi and then settle down at about 5psi thru the rev range - if i could get it to run no more than 8psi i would be happy ( for a start ! )

so im hoping that will all the mods i should beable to do this

i just want to get the 1/4 miles to under 15sec

take from my MY RIDE page :


GRINDER\'S RIDE

Well here she is :-

Car : RX7 Turbo II
Year : 1990
Colour : Black
Miles : 105K
Rebuild : Yes , By Mazda around 75K
F.S.H. : Yes
BHP : Unknown
1/4 Mile : 15.07 Secs @ 91.94 mph ( did a 15.23 @ 93.41)


Work Done :
Main Cat Removed
Boost Gauge
Magnacor Plug Leads

To Be Done ( Have parts already ) :
Fuel Cut Defence ( not bothing with this now )
Boost Controller
De-Cat Pipe ( Turbo End )
FD Fuel Pump
Smoked Indicators
Single Din Conversion for Radio
Lots and Lots of welding
Under Dash Neon Lighting
Blitz MFCS ( Multi Fuel Computer System ) - should get the 1/4 down to 13.9 with this baby
Front Strut Brace ( Megan Racing RX7 FC3S Strut Brace )
Auto Meter A/F Gauge

Future Stuff ( Need to buy ) :
Removal of airpump
Dual Alternator Pulley thingy ( on its way from ebay )

[Den]

I\'ve never had any experience with that specific controller before so i cant say for sure but i would imagine it works just like any other.

It should be able to lower the boost but you\'ll never get the boost lower than 5-6 psi without changing the wg actuator. You should be able to keep it as low as that with the controller.

When you say you have a decat pipe do you mean the precat or main cat ? If your getting rid of both and want to run a steady amount of boost i would port the wastegate especially as you say you want to turn the boost right down for the motorway etc.

I would be very surprised if you didn\'t get into the 13\'s with that lot !

[Grizzly]

I had exactly that Boost controler on my Red Fc when i bought it. I found it would not go down (oviously due to the preset Actuator) but it would go up ALOT!!!! i found this out when i knocked it with my arm whilst giving it death down the motorway. Suprisingly though it did\'nt let loose but it did\'nt do it any favors. So i pulled the nob of it so it was not as easly knocked.

I admit it was in a daft place though, somone had put it in a blank next to the handbrake where i kept knocking it up and down.

All i can say is get a Boost Gauge fitted and see if you can borow a Wide band (maybe take it to Pip\'s) and see when it starts to lean out. From first hand experiance i have run upto 1 bar on a stock T2 and it drove fine until the eventful day it let loose.

Chris

[grinder]

hiya chris - long time no speak !

are we correct then with the wiring of the this up ??

i was gonna fit mine in the same place as what you said - maybe i need a rethink !

you ran at 1bar - thats impressive - i would be MORE than happy with that figure !!

Den , yeah i have lots of toys to fit to the car - if i could get it to under 15secs i would be happy - 14.5 and i would be really happy

the main cat has been removed - and its just the pre cat ( turbo end ) that needs replacing

the dual alternator pulley has arrived - so i think thats it for the car now - it has all the toys - just need to weld the thing together before i start tweaking - and time is running out QUICK

[WillRayden]

Originally posted by grinder
when i drove the car last ( over 6months ago ) - it used to spike to about 6psi and then settle down at about 5psi thru the rev range

So what boost pressure is standard then??  Mine spikes at 9.5 and settles down to 8psi and drops off after 6000rpm, is it over boosting?

Will

[grinder]

to be honest - yes it does sounds like its over boosting

problem is - i dont know what they run at standard !!

i have been told that if you completly decat the car - then yes it should run at about 8psi - but im not 100% sure on this

have you any upgrades to the car - or is it completely stock ?

mine never seemed to drop off - but then i was only using the stock gauge in the dash - since fitting the boost gauge - i think i only did about 20 miles before the car was taken off the road

im sure the Haynes manual says that its something like 7psi as stock - but doint quote me on that

i will have a look round and see what i can find

ta

stu

[grinder]

right then - this is the best i can find at short notice

" BOOST PRESSURE : Above 4K boost begins , above approx 5K more than 7psi "

thats from the Factory Service Manual

now i also found that the turbo has a pressure of 8.25 PSI - now not 100% sure what that means ( section 4b page 43 )

i hope this helps - but like you - i would love to know what i stock TII runs at ??

ta

stu

[grinder]

right then - this is the best i can find at short notice

" BOOST PRESSURE : Above 4K boost begins , above approx 5K more than 7psi "

thats from the Factory Service Manual

now i also found that the turbo has a pressure of 8.25 PSI - now not 100% sure what that means ( section 4b page 43 )

i hope this helps - but like you - i would love to know what i stock TII runs at ??

ta

stu

[Grizzly]

Well if it helps i can get two reading.

I\'m guessing my Ic is C**p as there is nearly 1 psi diffrence between a take off next to the Turbo and a Take off on the lower inlet manifold?

But i get roughly 8.5psi.

I was also led to belive it was the S4 that ran 7psi and the S5 ran slightly more but don\'t hold me to that?

Chris

[TRex]

Originally posted by grinder

the dual alternator pulley has arrived -

 Grinder, where did you get this, \'if you don\'t mind me asking?\'

[Grizzly]

I belive you get them from Pip at WGT.

[grinder]

the dual pulley thingy - you can either pay Pip @ WGT £45 - or do like i did and buy one from USA from Ebay - cost me £16.67 delivered ( and took about 8 days to arrive )

[TRex]

Stu

 Thanks, Saving some cash is always good m8! :yes

 Can you shoot me some details on where I can get this at that beautiful price?

 rgds

[grinder]

if saving cash is your thing - welcome to my world !!

all i did was search on EBAY.COM for RX7 DUAL - and it came up - the bloke sells them every week - week in and week out ( chap is called Banzitoyota or summat like that )

just bid about $20 - i got mine on a second chance offer - shipping is $13 - but when mine arrived it was only $5 - so thats a bit of a con

at the end of the day though - its cheap enough anyways !

[grinder]

here you go matey

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33573&item=7962045061&rd=1