gz91rx7

Ok I need help my T2 is boost really strange.
I can only hit 5 max psi in 1st
8 or so in 2nd
10 or so in 3rd

I am looking for problem areas to check first. I am going to look at my vaccum lines but from what I already have checked they appear fine.
Is there anyway to check those other than just my eyes?
Also I have heard that the apexi bov leaks after 9 psi has anyone ever heard of this?
Also could a very rich running car cause low boost?

here is my mod list:


Engine Mods:
- Trust Airnix Filter
- Greddy Extreme 60mm Exhaust
- Custom 3" Turbo Inlet
- Disabled secondary throttle plates
- 3" Hi-Flo test pipe
- 3" Racing Beat Downpipe
- Hybrid Turbo Garrett T04B (Compressor) / Hitachi HT18 w/ ported wastegate
- Apexi dual chambered BOV
- Mild Street Port (intake and exhaust)
- Rebuilt block w/ FD corner seals and springs (4-5K miles)
- Racing Beat Engine Brace
- Magnacore 8.5mm Wires
- MSD 6A Ignition Pack (Leading Coils)
- HKS FCD
- Apexi ACV-R Boost Controller

Suspension Mods:

- Suspension Techniques Front Sway Bar
- Tokiko Illumina Shocks
- Trust Upper Strut Tower Brace
- (4) 17x8 (40mm offset) Rota Stage 5 Rims
- Dayton ZR Tires
- 215-45 (front)
- 245-45 (rear)

Transmission Mods:

- C's Short Shifter
- Mazda Trix Competition Mounts (new)
- Racing Beat Lighten Steel Flywheel (new)
- OS Giken Clutch (FD Stock Clutch) (new)
- ACT Heavy Duty Pressure Plate (new)
- Redline Oil in Tranny
- SS Braided Hydraulic Clutch Line


Fuel Supplement:
- FD Fuel Pump
- (2) 720cc Injectors in Secondary
- Apexi Super AFC


thanks guys,
Josh

FC Drifter

sounds fairly normal to me. no car makes a lot of boost in 1st gear. youll make a lil more in sec and hit more in 3rd. just the way things work i guess.

Scott 89t2

as answered last week to the same question... it's normal.

Barwick

I too vote normal. There's not enough resistance (spelled time in 1st gear) to build up enough air going through the motor to get enough boost.

gz91rx7

Well I am not really concerned about first that much because I am now aware that there isnt much boost in 1st gear but the thing I am concerend about is why I am not getting more boost throughout the rest of my gears. I dont know what to look for as to the reason I am not hitting 14 or 15 psi?
Like I said I have heard of the apexi bov leaking after 9 psi so I thought that maybe that could be a problem.
Thanks for the replies.
I look forward to the new ones.

FC Drifter

its the ported wastegate id say. if it wasnt ported youd be running the 15psi. im guessing this is a 87-88 turbo? im not real sure because its a hybrid turbo, but my .02 as to why you dont make more than 10psi is because your wastegate is ported. wait i see you have a boost controler, this is with the controler turned off right? if 10psi is all you see when its on and set higher, id say your controler is messed up.

gz91rx7

No it is a S5 T2. No that is with the b.c turned on. I disconnected it and got the same boost with the ecu.
If I am not mistaken the wastegate has a spring correct? Well could my problem lie in that spring?
Could that spring be to soft to support anything over 10psi?
I dont know exactly how all of these things work because I had a n/a before I got the T2 and it was well modded when I bought it.

Thanks
Josh

FC Drifter

do you have an internal wastegate? if your turbo is based off a stock turbo then you do. if you do have an internal w/g then you have no spring. its a vacuum operated diaphram(sp?) that moves a long actuator rod attatched to the w/g arm. my (uneducated)guess is the boot controler. you may have something hooked up wrong or it might just be defective. but id go ahead and check it. if thats not it, then check all your vac lines. you may have a boot leak somewhere, but check the b/c first. it sticks out in my head as the problem, but i could be wrong

rochsteve

I have an 88 TII and with slight mods(RB cat back and Bonez intake) I am boosting to 6-6.5 lbs in first and 7 to 8 depending on air temp in other gears.

gz91rx7

Ok this is not normal! I checked damn near everything and it is all good. I am down to the wastegate.
Do I have to take the wastegate off to check it?
How do I check to see if it is working properly?

Thanks,
Josh

NRA T2

my boost pattern W/stock turbo is 6, 9, 10

Rpeck

If your boost controller is setup right .. the wastegate should have no effect.

But a BOV leaking early could be a issue.

gz91rx7

well when I am giving it a little bit of gas I hear a whistling sound then it goes away at wot.

Rpeck

Goes your BOV have a Vacuum line hookup?

gz91rx7

yeah into a nipple on the manifold

Rpeck

Well, im not sure how your BOV works .. but mine has a tension spring & washer you place to make it stiffer and looser. I would make sure that you have good Vacuum at the manifold plug you have the BOV plugged into, and esspecially at throttle levels you seem to think its leaking. Adjust it and make it a little stiffer also. I'm not sure if a leaking BOV is your whole issue... but its certainly more hindrance than help. Fix one thing first then try plan B if that doesn't work.

Thats what i would do to start anyways. If your BOV is letting out boost pressure prematurely it makes sence that you would not be meeting your maximum boost potental.


Robert

gz91rx7

Robert thanks for the help!
I think that I have the adjustment screw pretty damn tight! Maybe the spring inside the bov is bad who knows.
One thing that I just noticed is that on the intake there are two hoses that come out of the rubber intake section, one of which had a metal piece where it joins with the intake. If I pull on it, it moves about a 1/4" before it hits something that holds it in.
Is this normal?

Also does anyone know what to look for and how to check the wastegate?

Thanks,
Josh

Rpeck

The FSM explains how to test the wastegate. But in theroy if it was not fuctioning properly you would have a consistant failure in all gears. I.E. you would max out at 5.5??? in every gear, you would not get 4-8-10. I would take a real close look at your boost controler setup & BOV .. seems to me it would be related to one of those. You can always hook up a DIY boost controler just to test things out. They can be made for pennies. I'm not sure about your metal peice on the hose question .. I don't have anything like that. Pop a hoseclamp on that thing to be safe.

gz91rx7

well what I am thinking is that it isnt shutting all the way. Or it is stuck open.
I agree about what you are saying that in theory it should be the same in all gears. I think that I am going to try and get the install instructions for the B.C and double check everything.
It is the old avc-r so it may be hard to find.
I will have to search for the info on the DIY boost contoller.

dr.jones63

I have a S5 and a ACV-R. Turn the solinoid duty cycle up. I have my boost set to .8 bar (12 psi) and I can hit it in all gears between 3000 and 3500 rpm. I can hear my turbo whistle when it spools. If the BOV is really loud and the turbo whistle is really loud check for a leak. I had one between the intercooler and the throttle body. The only other thing is mabey your larger than stock turbo takes longer to spool.

gz91rx7

DR- what is your duty set at?

Correct me if I am wrong but isnt 1= to not ever opening?

Mine is set a 1 bar with the duty at .74
I am told that with a ported wastegate it should be high but I am at a loss when it comes to what to set the duty at

dr.jones63

The setting has to do with how many times per second the duty valve cycles. I have the new ACV-R and I have it set to .8. The new one adjust automatically to controll boost also. My wastegate is not ported and I have no creep. Try stepping your duty cycle up and see if it helps. I wonder if you wastegate leaks.
Thats a pretty aggressive set up. Whenever you change the fuel injector size you need to retune the motor. That S-AFC is not plug and play. It may be time to sell that S-AFC on Ebay and get a haltec

gz91rx7

well how would I check to see if my wastegate leaks?
That is what the local rotary hero suggests but I just dont know what to look for.

Thanks,
Josh

Oh yeah and I hope that I dont need a Haltech because I dont have that much money laying around.

dr.jones63

Thats beyond me?

http://www.fc3s.org/#

have you seen the online manual?
how to/manual

gz91rx7

Well I am into the process of checking the wastegate tonight. I have that whole side of the engine bay removed.

Well c how that goes and I'll report back