Whats up, ive been thinkin latetly that i might have messed up goin with a .48 exhaust on my t3to4E turbo. I wanted to know some opinions on weather a .48 exhaust 57 trim turbo is going to actually "choke" up top on an f22b1 2.2. I know i can get better flow with a .63 but is my turbo actually choking up in higer rpm? It feels like this sometimes in 5th gear...but i also have one small section of exhaust that is stock and also the stock cat converter. What i baisically want to know is if the turbo is choking up...any one run a .48 exhaust? Thanks in advance

 

wow, you're doing 5th gear pulls? Your motor won't last long if you keep that up.

Chances are its your turbo if it runs fine otherwise. I mean if it runs well at lower rpms (in boost) then thats likely your turbo. Your cat and stock exhaust aren't helping you any either

 

I dont pull to redline...but i dont think pulling in 5th is that bad. Anyway the turbo can beable to flow at lower rpm and not higher because of more cfm's at higher rpm, what i need to kno is if my turbo is not capeable of doing that at only 8 psi. maybe this should eb in FI forum.

 

going 5-6rpm a couple times a week isn't that bad, i usually only do it in 1st and second once a week. my friend beat the **** out of his mom's 94' Accord LX for a year straight, we used to go snow drifting in it and rev the **** out of it...it still runs like a champ

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Corruption &raquo;</TD></TR><TR><TD CLASS="quote">going 5-6rpm a couple times a week isn't that bad, i usually only do it in 1st and second once a week. my friend beat the **** out of his mom's 94' Accord LX for a year straight, we used to go snow drifting in it and rev the **** out of it...it still runs like a champ</TD></TR></TABLE>

Your friend's mom had a boosted accord?? We are talking about a turbo car here, not drifting your friend's mom's beater
4th and 5th gear pulls put a lot of stress on your motor. Check out the FI forum. There's at least one thread a week that deals with a blown motor due to 5th gear pulls

Truesleeper, I'm not sure what you're asking If your car is tuned and runs great in boost at lower rpms and then falls at high rpms then it is your turbo.

 

No way would i replace the turbo, the .48 trim kicks ***. Get rid of the pea shooter exhaust and you will notice some HUGE gains.

 

.48 should not be too bad, as said above try opening up your exhaust... it will help alot.

how does that unit spool, pretty quick I would imagine?

5th gear pulls are all about the tuning and fuel management... it is always the most stressful gear for hard acceleration (because of the gear ratio).

 

Yes but alot of the forced induction guys are running higher compression settups on stock rods that believe it or not are not as strong as stock f22 rods. Im not dissagreeing that 5th gear pulls arnt the best thing but with a 11.5-12.0 AFR up there @8psi and the f22's guts it can take it. I have a 124000 mile f22b1 with 180comp. even across and a tuned map, i drive 100 miles to school and back once a week boosting alot, its all in the tune, frequent oil changes, and the f22. I will remove the exhaust this weekend and will post results, i respect both answers because i myself thought it could be the housing thats why i posted. Thanks

 

... the f is a beefcake, nice work on doing it right with a good tune... (do you know what your timing at btw, just curious?)

I agree the f can take it... let us know if temporarly droping the exhaust helps things (although loud sometimes )?

How big is your dp? Does it feel like the power caps to early in the high gears like that?

 

Im running 27* max at 8psi, downpipe is 2.5" and yeah just seems a little flat as rpm increase. Are you running uber?

 

I run a .82 on a stage3 60trim on my f22 - it's too big IMO (but the price was oh so right). Gonna find me .63 - that should be the hot ticket right there. I would think a .48 would be a little small, but I guess it all depends on your target power.

BTW, I rev to 6k+ all the time - hitting 7k at the track. Not saying that this produces any more power (still have to hit the dyno), but I have no problem doing it. I built it, I trust it. Justin Izumi mentioned that I could rev to 8k if I wanted to, but that's pushing it IMO

..and there's nothing wrong with 4th or 5th gear pulls if you're tuned right.

 

you won't see any gains from going to 8k on an F, the power on my car drops from like 5800 on and you'd probably float a valve or three with stock valve springs/retainers...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by notoriousB &raquo;</TD></TR><TR><TD CLASS="quote">you won't see any gains from going to 8k on an F, the power on my car drops from like 5800 on and you'd probably float a valve or three with stock valve springs/retainers...</TD></TR></TABLE>

You're probably right, but that's the difference between me and most people. I like to try things myself and depend less on heresay. If it breaks, it breaks. I fix it and move on - no biggy.

 

LOL! Break it dude! Why stop at 8k?

I'm just saying on the dyno graph I have the power is definitely dropping as you reach/exceed 6k...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by truesleeper &raquo;</TD></TR><TR><TD CLASS="quote">Yes but alot of the forced induction guys are running higher compression settups on stock rods that believe it or not are not as strong as stock f22 rods. Im not dissagreeing that 5th gear pulls arnt the best thing but with a 11.5-12.0 AFR up there @8psi and the f22's guts it can take it. I have a 124000 mile f22b1 with 180comp. even across and a tuned map, i drive 100 miles to school and back once a week boosting alot, its all in the tune, frequent oil changes, and the f22. I will remove the exhaust this weekend and will post results, i respect both answers because i myself thought it could be the housing thats why i posted. Thanks</TD></TR></TABLE>

If you change your exhaust you'll need to get it tuned again, but its definitely worth it

 

UPDATE: WOW huge difference in removal of cat, most noticable is torque increase, ive been mising out this whole time. Boost hits VERY hard and pulls to 6g's HARD as **** no more choking. I dont know how much i gained but i def can feel a shitload more torque i love it. The .48 spools veryfast and now 5th pulls almost as hard as 4th. Very impressed with removal of cat...i kno i kno the environment, but the difference it made i could never go back. Anyone else experience this with removal of cat? Maybe mine was clogged i could barely see any light at the end when looking through it.

 

A few months ago i did all the calculations, and the perfect size turbine housing for a 2.2 liter engine is .63
Just thought i would let you know...