pearlrx7

I have a convertible that i just put a S5 T2 in. I dont have a boost guage hooked up yet but i feel that i'm probably getting close to pushing all the boost the stock intercooler can handle (11 psi???). I've got an intake, the RB turbo back exhaust, and also a walbro 255 FP. i've got the FCD already hooked up. Anyway i've got a FMIC and pipes that should be put on sometime this week. Since i'm goin with the FMIC i didnt get the T2 hood even though i'd like it, so i can vent some heat from the engine bay. I dont feel like i'm getting all the power i should be with the T2 and my mods. When I drive it, i leave the hood off. Could it be because the stock intercooler isnt getting direct air, preventing it to cool well. Or could the feeling of lack of power be from the weight diff, b/c the convertible is around 400 or 500 lbs. heavier than the coupe i think. Will there be a big difference when i get my FM installed?

13b4me

Lack of power is all of the above... The scoop is designed to force air through the i/c, and without it, the air just blows right past it... The fmic will raise the boost again so make sure to get some larger secondaries...

pearlrx7

preciate it, i'm lookin at gettin some 720s for 2nds right now, maybe move them up and get some 1200s later one for the 2nds. That'll be a long time from now though b/c of lack of $$$! Too many other upgrades involved with that.

Juiceh

iTrader: (4)

Strange, my vert ripped with the TMIC and an NA hood.(didn't drive this way very long and it was cold up here at the time, everythings changing now though) I had about the same mods as you too(RB Turboback, intake, walbro255, FCD).. I'd get a boost guage asap and find out what your actually boosting.

pearlrx7

did you drive with the hood on???

Valkyrie

...I would have to dissagree..

IMO the point of the hood scoop is because otherwise it wouldn't get any air through it at all, and the intake charge would be too hot, and lead to detonation (plus, it would also heat soak very quickly).

If you didn't have a hood on the car, it would get just as much air (if not more), and for that matter, the whole engine would stay a lot cooler. Air doesn't have to move through something to cool it... at a minimum it just has to flow around it, although that would probably be a bit less effective (but in this case, the amount of air flowing around it would probably be about 5-6 times greater, as a random guess).

Also, a bigger FMIC won't increase boost. On the contrary, I beleive they tend to drop the boost that the engine sees due to pressure drop.

An FMIC will increase the amount of AIR that gets into the the engine though (ignoring pressure drop), since the intake charge will be much denser due the increased cooling effect, so I do agree that new injectors might be nessicary...

NOPR

an s5 turbo makes about 5-6psi without a boost controller, it runs about 8 with the stock electronic boost controller. you should not turn it up past 8psi under any circumstances since you have a stock ecu and fuel system, and you should definitely remove the fuel cut defenser until you get some bigger injectors and something to tune with. those should be a priority over a front mount. fuel cut is a safety device to keep your engine from blowing up from too much boost, why the hell would you remove that if you havent upgraded the fuel system? oh, and a walbro wont keep your engine from blowing up, either.

also, 13b4me, how would a front mount raise boost? it might cool the intake temps, but i dont see how that could raise the pressure.

NOPR

damn, barely beat me to it.

Juiceh

iTrader: (4)

LoL, YUP! 700 Miles in cold weather(40-50 degrees I think) from Kevin Landers place to mine. Then about 200 more miles until I dropped the car off at A-spec for some changes...

pearlrx7

you got some guts, it would scare me to death to drive that far with the hood on, nomatter what the temp was.

Juiceh

iTrader: (4)

Yeah, but it was the break in period so I stayed out of boost as much as possible. I only pushed the car once after I got it home and managed to leave a pair of 50 foot long rubber streaks after shifting into 2nd gear... But it was cold out and the road had salt dust on it so my tires didn't have the best traction.

This tire buring incident made me realise that I'm gonna need ALOT more rubber in the rear after my new turbo setup is in.

13b4me

Perhaps I should rephrase myself... It doesn't increase the boost from the turbine itself, but it does increase the volume of air being forced into the engine, thus necessitating the need for larger injectors, as per my post... Better?

pearlrx7

nice car... it looks good, i like the rims

pearlrx7

thanks for the advice, i didnt realize the need for larger injectors was as high priority as it is. i knew i needed them but not that bad.
so a list of my immediate needs should look like:
boost controller and guage
...??? 720 secondaries ???...
and a tuner.... (safc) (safc2) any suggestions of something effective but cheep... low budget

13b4me

Unless you plan on turning the boost up further, there's no need for a boost controller... They only serve to turn it up, and the baseline is set by the wastegate...

pearlrx7

well i guess i need to port the wastegate and get the controller b/c i'm lookin to turn it up!

pearlrx7

would a HKS PFC F-Con be a good upgrade for my setup and work well with some 720 secondaries?

tandolla

iTrader: (1)

i heard the fcon didnt work that great. what i am gettin is the Rtek1.8 which requires 720\'s i beleive. ( only with the 1.8 not the 1.5 ), and that has alot of features to it including the FCD. and thats only $125, or if you want to get the 2.0 that has alot of stand alone fts. just a sugestions. i am gettin the Rtek1.8 wtih 720 sec. when im done with my TII swap.

pearlrx7

i thought r-tek wasnt for s5

NOPR

its not.

pearlrx7

any other advice on the f-con

13b4me

The Fcon will work... It's just pretty old school... lol

Honestly I would say screw everything else you have in mind for the time being and go ahead and invest in a standalone... Then you have the building blocks for anything you wanna do in the future...

classicauto

iTrader: (3)

Yep.

The F-Con modifies the injector signal itself, unlike the S-AFC which modifies the airflow signal to dangerous levels. (On the FC, going too far with the airflow signal modification can make the ECU bump the timing because it thinks its got too much air. This = bad) For that reason the F-Con is superior.

13b4me

Very good point. ^

Juiceh

iTrader: (4)

I couldn't agree more.

Pearlrx7, I know your on a budget, but seriously if you plan on doing any real upgrading in the future don't waste your time with piggybacks. Get a boost guage to find out what your boosting at now and make sure your not having boost issues. Then run your current setup for a little while and save up for a decent standalone. I put an SAFC-II in my ride and regret doing so. Not even a month later I ripped that pos out and am putting in a Microtech system.