matty-tC

ok well i have 2 friends with identical cars that added FMIC at the same time and had significant pressure drop with the added piping and intercooled. (they were previously non intercooled).

the housing upgrade they installed actually helped them get traction (by not spooling up as fast and putting 300whp to the ground immediately) but upped full bost 800rpm-1200rpm higher or so.

turbo2liter

Where were they drawing their vacuum sources for before and after the FMIC upgrade? How did you measure a pressure drop?

I'd much rather have traction as an issue than spool. Traction can be solved, either by more tire, or better driving. Spool is a little bit harder to solve for

matty-tC

i don't believe the vacuum sources moved.

not sure how they measured it. they just told me they did.

actually they liked it better after the housing upgrade. it gave cooler charge and better traction lower end.

turbo2liter

If they left the vacuum source at the turbo as I suspect, then obviously they would notice a slight change in boost, and probably have to reset the boost controller. Take your boost reference from the manifold so you have an accurate account of what is actually going into your engine. You could be making 12psi at the turbo, loose 5 psi to boost leaks and "think" you are tuning it in to 12psi. Just make a pressure tester to check for leaks

matty-tC

there were no leaks. they did test for that.

i believe the vacuum was about 2 feet from the throttle body (pre MAF)

turbo2liter

If the reference was at the throttle body both before and after the FMIC install, then there should be no practical way to tell a pressure drop, as the turbo will just spin a bit faster to make up for the FMIC.

Now if he manually tested the FMIC, he may detect a drop.

DynomyteSW

makes sense to me turbo2liter

rcruz2525

Hi everyone, we are planning to start at 12psi and see how the tc will react. If everything is ok, will go to 14, 16. It depends on how well the fuel / air mixture is adjusted with the computer. We know the tc can handle about18psi with stock internals but that may be at the borderline, we want to build a reliable car.
We are testing 2 different turbos one of them is in the range of 200-420hp and is base on a 2.0-2.7 liter engine. This turbo will be ideal for a scion tc, the tc is a 2.4 liter engine and we want to be around 300-350hp range. The other turbo is a bit bigger and is in the range of 260-510hp and is base on a 2.5-3.2 liter engine. One turbo may have more top end vs. the other but it may take longer to spool, but can not confirm that until we tested them. We will try them all and see what works better.

matty-tC

i'll have to get with them and see how they tested it..

matty-tC

what are the plans for internals for this car hitting 12psi?

turbo2liter

A turbo is based on a certain size engine? Really? I always thought it was based on airflow and power goals. You could put a big 16g on an LS1 if you wanted, but I'm not sure it would ever hit boost. You could also slap a T6 on your engine, once again, never hit boost.

rcruz2525

Turbo2liter, yes a turbo is based on a certain size engine. Don’t get me wrong you can put any size turbo on anything, that does not mean is going to work at it’s best. Went turbos are made they fallow some engine size guideline, look for your self.. look for the displacement on any turbo on this pdf file.. http://www.jimwolftechnology.com/wol...TCATOLOGUE.pdf

turbo2liter

I looked at a chart simliar to that years ago. Now, I'd rather just have a compressor map and measure that way.

I don't subscribe to the whole "custom designed turbo" BS, it's just marketing. Yeah, you could call up Garrett and be like "Yeah, you're .63 is a little small and your .70 is a little big.. can you make me a .67 a/r t3 housing please?"

Nah, they would laugh at you.

rcruz2525

Like I said, “you can put any size turbo on anything” but you have to start somewhere and that is a good guideline to go with for starting, we will soon find out what works best!!