turbo f22 problem?

[rxnasty]

turbo f22 dsm build. boosts well. not quite like it should,
but after it warms up it wont start.
has only -4 vacume when it warms up.
runs on the rich side of stoich under boost.
have to turn the fuel press. down to start it up after warmed up
NO CHECK ENGINE LIGHT TURN ON DURING ANY OF THE OPERATIONS.

S.O.S PLEASE HELP! THIS IS MONTANA GUYS

[deevergote]

What are you using for tuning?

[evil_demon_01]

Whats your idle speed when it's warm at -4 vac?

As above what are you tuning it with? I'm guessing a rising rate FPR?

Has it always been like this, or only since you fitted the turbo?

Low vac could be the result of poor compression - Did you check the compression readings before you went turbo, and Now?

[rxnasty]

Whats your idle speed when it's warm at -4 vac?

As above what are you tuning it with? I'm guessing a rising rate FPR?

Has it always been like this, or only since you fitted the turbo?

Low vac could be the result of poor compression - Did you check the compression readings before you went turbo, and Now?

It idles between 200 and 600 rpm's
Were tuning with a SARD FPR
It has only been like this since the turbo swap
We did a compression check last week. 145 roughly across all cylinders

[deevergote]

FPR tuning? That's a pretty archaic method...

[evil_demon_01]

It idles between 200 and 600 rpm's
Were tuning with a SARD FPR
It has only been like this since the turbo swap
We did a compression check last week. 145 roughly across all cylinders

Run it up till its warm and starts causing issues, then remove the turbo piping from the throttle body and see if it starts working OK.
I bet its having issues pulling enough air in to the long/restricted intake of the piping, intercooler, turbo, and airfilter.
Thats one reason proper tuning is necessary.

What injectors are you using? If your using 450cc's then that will cause issues too, they will be flooding the engine at idle.

FPR tuning? That's a pretty archaic method...

And provides NO ignition compensation.

[rxnasty]

[IMG][/IMG]

Run it up till its warm and starts causing issues, then remove the turbo piping from the throttle body and see if it starts working OK.
I bet its having issues pulling enough air in to the long/restricted intake of the piping, intercooler, turbo, and airfilter.
Thats one reason proper tuning is necessary.

What injectors are you using? If your using 450cc's then that will cause issues too, they will be flooding the engine at idle.



And provides NO ignition compensation.

The car runs with none of the boost piping attatched to the throttle body
Im runnin bluetop injectors. 450cc
I have no tuning cuz i live in montana. its pretty hard to find a dyno.
Were just using a stoichometer and the FPR until we can get to seattle. and
ill prob run a p28 with a apexi afc controller.
Weve done everything tha same as out other boostin cb7's but somethin is fishy.

ya but thanks for the help. i'll try my 390's didn't expect such a fast responses. rx7 club guys are not too friendly

HERE'S A PICTURE

[evil_demon_01]

The car runs with none of the boost piping attatched to the throttle body
Im runnin bluetop injectors. 450cc
I have no tuning cuz i live in montana. its pretty hard to find a dyno.
Were just using a stoichometer and the FPR until we can get to seattle. and ill prob run a p28 with a apexi afc controller.
Weve done everything tha same as out other boostin cb7's but somethin is fishy.

ya but thanks for the help. i'll try my 390's didn't expect such a fast responses. rx7 club guys are not too friendly

So it runs fine when the boost piping isn't connected and bad when it is - correct?
How many psi are you running?
The blue tops max out at about 12psi on the DSM setup, so if you go to the 390cc you will be creating very lean conditions on top of the already inaccurate FPR adjustments.

How far rich past stoich are you running it? 13.0, 12.0, 11.0 etc ??

When you say "the same as other boosted cb7's" what do you mean? Because I only know of one other person on this forum that has used a FPR for tuning.

[carbonaccord69]

What spark plugs are you using? I had a similar problem but it was fixed when I changed the crappy plugs a shop used when my motor was reinstalled. I also found a vacuum line I had to plug.

[deevergote]

You don't need a dyno to tune it. You can simply use a chipped P28, a wideband o2 sensor, some datalogging software, something to edit the fuel map, and a chip burner. A dyno is ideal, but a "street tune" would be a hell of a lot better than what you're doing now! If you're using a P28, there's no need to use an AFC.

[TimmyPone]

nope if you have a chipped p28 then afc is a pointless light show im running a p28 hondata s100 in my car

[rxnasty]

So it runs fine when the boost piping isn't connected and bad when it is - correct?
How many psi are you running?
The blue tops max out at about 12psi on the DSM setup, so if you go to the 390cc you will be creating very lean conditions on top of the already inaccurate FPR adjustments.

How far rich past stoich are you running it? 13.0, 12.0, 11.0 etc ??

When you say "the same as other boosted cb7's" what do you mean? Because I only know of one other person on this forum that has used a FPR for tuning.

Ok. The car runs completley fine untill we go and drive it.
We can take off the boost piping at the throttle body and it runs fine b4 we
go and take her for a spin. (or try i guess)

Were doing 8lbs of boost
were using a airfuel meter attatched to the o2. so we dont get number
readings like an ngk powerdex. the afm says its runnin uber rich



now im not the brains of this project. this guy i met up here named david has done 2 of these dsm turbo setups on these f22's. I'm basically the interpreter cuz he isnt very competent on a computer. the one he built for his bro is daily driven and still runs strong



what im runnin. maybe it will help
dsm 14b turbo
rebuilt 450cc bt inj from a guy on ebay
h23 intake mani/w emissions removed
bizimoto intake gasket
blue ngk wires
ngk iridium plugs
rebuilt stock motor
rx7 top mount intercooler.
civic illuminum radiator
OBX CHECK VALVE
hks bov
sard fpr
glow shift boost guage
autometer afm


but my question is when david did these swaps to his cb's he was usin cb's with a4 motors. mine is an a6. is there anything we would have to change in order to get this thing to scoot from a6to a4?

[deevergote]

Not really. The F22A engines are pretty much the same. The only differences between the A4 and A6 are the camshaft, intake manifold, exhaust manifold, windage tray (the A6 has one), valve springs, and ECU.

The only thing that could help is to ensure the F22A6's intake manifold has the IAB system hooked up properly. It will still run well enough without... but it'll choke up top. That wouldn't be the cause of the problem.



Honestly, your problem probably lies in your tuning methods. What you guys are doing is basically equivalent to trying to eat a bowl of soup with a hammer.

[ChIoVnIdCa]

were using a airfuel meter attatched to the o2. so we dont get number
readings like an ngk powerdex. the afm says its runnin uber rich

Get a wideband to know how you are actually running.

[rxnasty]

Not really. The F22A engines are pretty much the same. The only differences between the A4 and A6 are the camshaft, intake manifold, exhaust manifold, windage tray (the A6 has one), valve springs, and ECU.

The only thing that could help is to ensure the F22A6's intake manifold has the IAB system hooked up properly. It will still run well enough without... but it'll choke up top. That wouldn't be the cause of the problem.



Honestly, your problem probably lies in your tuning methods. What you guys are doing is basically equivalent to trying to eat a bowl of soup with a hammer.

ya ill go check out those p28 chipped ecu's. i come from rx7's and have always ran some sort of tuning device. so i know exactly what you are saying. I just don't get how he got both of his to scoot just with tuning the fpr? it just blew my mind when he actually showed me his bro's car.but ill dump a bit of extra doe on the tuning gear since this method obviously isn't working. thanks a bunch for the help guys