I ran a 9.5














in the 1/8

A bunch of us brooklyn, guys are planning a track day at the end of march. Im hoping for 12's with my new setup, hopefully itll be done by then :(

13b-re
chipped tii ecu
14psi
apexi front mount
soild diff mounts
competition motor and tranny mounts
miata short shifter


I think i can make it, and im sure a half decent driver could.

alright since terrh you basically posted what i was looking to ill add a question in the mix.. ive had an n/a for two years, anyways i bought a t2 motor and am using the n/a tranny with the act clutch route.. (ill also have a full tII driveline and tranny, if the N/a will not be fitting due to HP) ..ive been gathering some turbo parts here and there, and am wanting to know if i have all need to turn boost up on stock turbo , stock internals, and want to know the safest psi, and add something in if my list if its missing plz..parts list => downpipe, full catback exhaust,blocked emissions, guages, custom made fmic and piping, intake, blitzbov, turboxs manual boost controller, HKS fcd, portd wastegate , FD fuel pump.. do i need to possibly get something like the apexi safc and some larger secondaries, 720cc?

Huh? Periods mang, periods.

My GTUs/TII ran a 14.1 bone stock. Of course I wasn't driving it and 4.30 gears aren't really stock for a TII.

Alright since terrh you basically posted what I was looking to, ill add a question in the mix. Ive had an n/a for two years. Anyways i bought a t2 motor and am using the n/a tranny with the act clutch route.. (ill also have a full tII driveline and tranny, if the N/a will not be fitting due to HP)

Ive been gathering some turbo parts here and there. I am wanting to know if i have all the parts needed to properly, and relatively safely turn boost up on the stock turbo. The internals are stock also.

add something in if my list if its missing plz..

parts list => downpipe, full catback exhaust,blocked emissions, guages, custom made fmic and piping, intake, efan, oil cooler, tII rad, blitzbov, turboxs manual boost controller, HKS fcd, portd wastegate , FD fuel pump..

do i need to possibly get something like the apexi safc and some larger secondaries, 720cc?

--88 TII--
S4 Streetport
Stock ECU
Stock Turbo
Stock TMIC -- Iced
Stock Susp.
Walbro 255
550/850 Injectors
3" Intake
3" Exhaust
Yoko ES100 245/45
20psi

2.11 60 foot
8.77 1/8
13.467@105.44

--New Setup--
Rtek 1.5
550/550 Injectors
12psi (peak) with Profec B Spec II, 8psi @ redline

feels nearly the same as when i was running 20psi but haven't made it to the strip to see for sure. and if it's cold out (30F), this thing just plain hauls arse.

PS: I have a 60-1 and a megasquirt just waiting to go in. In the middle of the design phase for custom water/air intercooler.

20psi on stock S4 Turbo? :wtf1:

No i did not. I want to say based on my knowledge, the LATER s4 engines were casted with the thicker rear iron because mine is identical to the s5 but has everything else s4.

Yep, but don't start another arguement, I have it on video and it's been proven over and over again. BTW, I have pictures of the stock S4 turbo hitting 26psi. And before you even suggest it......the Defi' boost gauge is accurate. And it became quite apparent the the stock TMIC can't keep up, which I already knew. But, fear not. I teamed up with a ported wastegate and boost controller. It's all good now.

No I'm not saying it can't be done. I'm just like..why? Are there any advantages? I've always heard after about 12 psi it more or less just pushing out really hot air.

It is. Though, PSI is kind of useless in this situation, sure you may be throwing 20psi at it, but really the volume isn't changing much, it's just the stupid ammounts of heat creating all the extra pressure. This is what people use compressor maps for, to determine where the efficiency drops so much that the turbo simply starts heating the air over actually compressing and moving more volume.

:eek: its gonna get ugly in here... :bigeyes:

Why would it get ugly? Nobody is doubting that the stock turbo couldn't hit those PSI numbers, but that's completely useless. You can move the same volume at 13PSI as you can at 26PSI, the only difference is the ammount of heat acting upon that mass of air which causes the pressure increase. Sure you can get stupid ammounts of PSI from the stock turbo, but your power isn't going to get much further (if even at all), than at the peak of the turbo (which is generally around 14psi on the stocker). You can try to mask this heat with alcohol injection and a larger FMIC, but it's not going to save you that much.

people tend to get upset when they say there pushing the stock turbo past 12-14psi. .... i personally havent a clue...if he runs 20psi. thats great !! no grudge here :)

its just people geting hyped up over PSI when its really about volume

^^^ That's what I was thinking, I mean, 10psi from a HT-18s is very different from a T-51KAI @ 10psi nevermind the size difference. I am saying just by looking at the psi.

man the stock turbo can easily hit 20psi... who gives a rat's ass??? you're probably making the same power at 13psi

boost pressure != horsepower always.

I ran 15PSI on the stocker all the time, car was fast but it didn't last long :)

I bet my new turbo (TD07-25A) makes more power at 5PSI than my stocker did at any pressure. Airflow is king. :)

This is true, so long as the IAT's remain constant.
15psi on the HT18s might be 250 degrees (example)
15psi on a GT25R might be 150 degrees (example)

hmm....the GT25R will make gobs more power...but wait you say. it's the same pressure. the air may have the same amount of pressure pushing air in, but the facts show that hot air has less "mass" than cold air. in the end, air mass and volume is what makes power, not pressure.


ok, onto my 20psi situation...again.....
put on intake and exhaust with the streetported motor and boost was creeping to 20psi. the motor didn't blow up so i kept doing it. then i finally got the wastegate ported but then it would only run stock boost which was slower..obviously. so i kinked the wastegate vacuum line so the WG would never open...bingo, back up to 20psi and at an earlier RPM than before. great midrange power there. now i have a profec b and have boost limited to 12psi. and like i said earlier, it feels just as fast, if not slightly faster, than 20psi. which i've been told a million times with no argument because i knew 20psi was bad. but i didn't care. it was faster than stock boost and i didn't have a EBC/MBC at the time.

if there's a ! before the = it means "does not equal"
hehe.

haha, didn't know that. sorry.

yeah.

welcome to turbos!!!!!

I hate when people don't know that!

kabooski i am curious as to what kind of power u had to run those times. please respond

those "times" are not a indicator of what i'm putting down
I "coasted" to a 11.59 ET

I'm around 500 HP
which with a clean pass and a good 60' foot (100% stock drivetrain)
should be around 10.8 1/4 time

My car with me in it weights a bit over 2900Ibs