I want to turbo my na but i want to do it safely, 5-7 psi daily , how much power can i expect with a s4 mild ported motor running this much boost ? Im hoping for at least 220-240 at the wheels or 260-280 at the flywheel...is this possible with 5-7 psi ..id be using bigger injectors, stock s4 turbo, tii manifolds, tii top mount fromt mounted, etc ... tuned with an safc and stock timing (unless retarding the timing is better ?


the engine has atkins seals, mild ported, exhaust diffusers taken out

 

i don't think many people have done this so you will prolly not get an answer.

 

yeah i figured that, but at least running 7psi daily ill be running safely rather than risking blowing my motor... that way i can save for a standalone instead of a rebuild when my motor blows from running more boost than my tuning can handle

i figure 550cc primary injectors and 620-720 cc secondaries should do the job for 5-7 psi, with a fd fuelpump or walbro, and an safcII to tune the fuel

with a standalone i could run 14 psi and id be just as fast as anyone else, and no one would know my motor is a n/a block, 5-7 psi would only be until i got enuf money for standalone, taking it one step at a time rather than trying to leap 20 hurdles and falling over them instead of doing it the right way

 

how much are you going to spend on this setup? icluding everything you need and/or already have?

 

No, you won't get that. Especially if you use the TII intake manifolds (can we say horrible flow?)

 

Not sure how much , $1000-2000 max

turbo - 200
injectors- 200
intake manifolds - 200
top mount intercooler/piping - 250
radiator ? - 200 i dont think id need this tho..?
fuel pump - 100
duel alt pulley - 20
intake setup - 100
downpipe - 100
bov- 150
gaskets - 50
exhaust - 300
safc- 250

total $2070, not sure what else id need , surely i could probably get it cheaper


if i dont need a radiator like 1400, but im sure i could find parts cheaper these are just estimates... id get all the parts in approximately a year or so, other option is to buy a tii motor , but id rather have a rebuilt motor like what i got now than using a motor thats been beat on before i use it.

 

why would it be horrible flow ? i thought it would be better flow than with the stock ? i dont want to use my n/a manifold i dont feel like using the spacer and notchingthe frame...

still dont know why u say horrible flow, why would they be using them on a turbo engine if they got horrible flow?

 

other option is save my money and sell my car and buy a tii...thing is most nice tii's are like 5000 bucks or more..and insurance is prolly alot too..no one would know my car has turbo so id be gettin a deal on insurance

and for 5000 im better off saving another 3000 and just buying an fd

 

Kahren dyno'd a streetported n/a (dyno section) with TII manifolds and said the swap over to TII from N/A didn't seem to change flow/power.

 

Seeing as a stock turbo S4 makes 182ish HP and maxes out at 8.6psi, I doubt you'll make anywhere near 260HP on less boost.

 

Correct me if I am wrong but dont S4s run 5.5lbs of boost stock? Also the higher compression of the N/A engine would make quite a bit of difference. I think you could prolly make it to 220whp with the stuff you are planning. It would be close though.

 

Ehh, I would say you would make about 175ish. just take the stock HP of the n/a car, and add like 50-70 hp and that should be a fair estimate.

 

Uh, the stock TII has more than that and he's using a 6 port instead of a 4 port, and higher compression rotors, and higher boost than stock. It'll more than a stock TII easily.

 

The 4 port manifolds chopped up for use on a 6port DOES provide a loss, dyno proven of 17rwhp on an N/A. For a TII it's considerably higher, depending upon how much you're trying to flow through it. I've compared the TII intake setups to the hackjob n/a setup and it's consistantly 15-20rwhp less. Both are less than my manifolds though. hehe

 

So if the 17rwhp was true, then the car kahren dyno'd with TII manifolds would be putting out over 200 instead of the mid 180's at the wheels? It just doesn't seem like that big of a deal to me, and Kahren doesn't seem to either from that thread in the dyno section, but I could be wrong.

Of course your setup is better, though

 

wat IM are you gonna use for ur setup , i want to go the same route as you, but will the S5 IM fit to the s4 block that i have?

 

High compression rotors dont make *that* big a difference. You might see 3-10% more power at a given boost level with hicomp than with stock. I've built a few hicomp turbo engines, including one for my FD with 9.7's. It felt nice, but it's by no means awesome.

I could see your average ported NA with turbo strapped on running 5-8psi being around 200rwhp...a stock turbo II running the same boost levels will be around 170-180rwhp. Youre not going to see a 50% increase in power just because you have 1 point higher compression ratio in your engine.

 

stock s4 t2 with just 3 inch exhaust and 9 psi of boost with an afc makes about 220whp
an na should make atleast that same power.

sonicrat how did you test the loses on the 4 port manifold on a 6 port motor i can not see 17hp loss if anything and port matched well it should be a gain if anything.

 

Stock port S4, first run with N/A manifolds, we then pulled it off the dyno, and swapped over to the dyno and swapped on the turbo intake which had been hacked and 'ported' to fit, removed the aux sleeves, and tada, 17hp loss. Why would you think they would flow better?

 

the air travels a better path in the turbo manofold, then the na one(s4 or s5). the runner length of the t2 manifold is about 19 inches the runner length of the s4 na manifold is about 20 inches, so very little diffrence there. and if t2 LIM is port matched well to the 6 port engine i doubt its any less superior then the NA lim.

i am porting an identical engine as to one that i last dynoed with this t2 manifold, and this new engine will be using the s5 NA manifolds and it will also hit the dyno so we will see the diffrence. these are not my own cars so i dont have the opportunity to swap manifold as i wish on the dyno or what not.

on a side note, there has got to be a flaw somwhere in your testing of the t2 vs the na manifolds on the 6 port engine. unless port mathcing was absolutely horrible and hurt the flow so much to guide air in properly in the aux ports that it lost so much power.

 

wtfdidusay- problem with not declaring turbo to the insurance company is after an accident the loss assessor would notice it and your insurance policy would be cancelled leaving you having to pay all costs. Insurance companies are not stupid and are always looking for ways not to pay claims.

 

For the price id get charged if i told them i had turbo I would be paying for the claim myself, i bet it would be like 200-400 bux a month for me for insurance, **** that its not like im getting full coverage anyways

 

it all depends on the compressor map of the turbo. i would suggest getting like an sc61 or a big *** turbo. if your runing stand alone, youll be able to redline as high as you need, according to where the hp starts to fall off. but as bigger turbo would be your best bet at shooring for those hp levels. and a stand alone.

 

NA to TII swap.......NA insurance.

 

My insurance company doesn't even seem to decipher between N/A and Turbo, they just put in RX-7 and it's the same for both.