b00sted4dr

Just wanted to see how people liked upgrading their downpipe to a 2.5" on their greddy kits.

Do you think i should see any spiking if i replaced the 2" downpipe and stock cat with a 2.5" testpipe to my 60mm exhaust? I will still be using the greddy elbow.

TIA

Integra21

I just made a couple threads about this,

from all the info i have gathered is that in order to upgrade the downpipe, you must port the wastegate flapper hole to not get any spiking or creep.

once that is ported, everything should be fine i would guess....

roydogg

I've got a flared 2"-2.5" dp on my kit runnin alittle over a 1bar goin to a 2.25 exhaust . Little over 2 years and it's still runnin great except for boost trying to hold steady all the way til redline. **** starts to fall off slowly after 5500-6k rpms.

Integra21

so your running a little over 14psi with the greddy kit?

why do you have a 2.5" DP at the end, then forcing it back into 2.25? how come?

Integra21

did you have your wastegate flapper hole ported?

roydogg

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Integra21 &raquo;</TD></TR><TR><TD CLASS="quote">so your running a little over 14psi with the greddy kit?

why do you have a 2.5" DP at the end, then forcing it back into 2.25? how come?</TD></TR></TABLE>

Yup actually 15 psi & was runnin it daily and beat on it like I stole it every chance I got too . I spike to about 18 psi once in a while but boost cut is set at 18 .

As far as forcing it back into a 2.25" I have the hks hyper system and it sounds really good, not like some cars with 3" systems. I know back pressure is not good but with 2 kids a so many projects I don't even wanna dump another $500-700 on a 3" exhaust when my car runs fine.

&lt;-------(knocks on wood).

It's a fun street car , plenty of mid range hp & tq 254whp & 249tq on about the 30th dyno pull and was tune very conservative by jeff evans.
If you'll like I can pm you a link to my dyno sheet.

And no I never got my wastegate flapper ported.





Modified by roydogg at 11:02 PM 5/21/2005

Integra21

good to know, nice numbers

roydogg

Gonna bump it up to probaly 20psi runnin open dp on the dyno, the exhaust will cause to much restriction. Hopefully I'll be in the 300's

Integra21

i was concerned when i looked at the graph since power was falling off after 6.5k

but then i saw you have an LS

roydogg

The 18G turbo tends to spool up really fast but the top end starts to drop off. Usually I think it's due to the internal wastegate and the the fact that it's a street turbo.
GSR @ 1bar
http://www.evans-tuning.com/fo...?t=86
LS turbo
http://www.evans-tuning.com/fo...?t=28
Delsol
http://www.evans-tuning.com/fo...t=788
sohc
http://www.evans-tuning.com/fo...t=169
sohc
http://www.evans-tuning.com/fo...=1613
LS
http://www.evans-tuning.com/fo...=1107

StolenTeg

roydogg, i think replacing the cast elbow would be a big help for the greddy kit. but in order to replace the cast elbow, a/c need to go and that suck but i think that elbow might add to the spiking factor since it very restricting.

I think that i might change mine to a full 3 inch downpipe right out from the turbo since i dont have my a/c anymore and run about 18 psi, but on the other hand changing out the manifold and going with a sc34 sound a lot better

roydogg

I was thinkin about doin this sometime in the near future on my current setup.



As far as upgrading to a new setup, I'd rather do it in the eg hatch I have but at the same time I wanna boost my G35 too . I've been debating like crazy between boostin the G or the hatch . I know that a eg will always run better times due to the power to weight ratio, but look at the Boosted G pix. What would yal do, to G or not to G?

This is the greddy tt kit for the G. I have the same color but might keep it a sleeper by getting the V mount IC.

BoostR41

I have a 2.5" DP---&gt;3" thermal.....no wastegate porting done....dyno is at 17psi and pump gas with a conservative tune since I drive the car everyday....it was also pretty heat soaked(36pulls).

roydogg

what kind of boost controller did you use? Power band is very nice especially with that much boost. Wastegate usually starts to act up after 14psi. Any spikes?

BoostR41

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by roydogg &raquo;</TD></TR><TR><TD CLASS="quote">what kind of boost controller did you use? Power band is very nice especially with that much boost. Wastegate usually starts to act up after 14psi. Any spikes?</TD></TR></TABLE>


profec b spec 1...... the car is perfect on the street powerband wise.....very very very light spike when it first hits full boost but settles and stays rock steady till about 6k then starts to fall off a bit down to about 1 bar at redline....

It is nice to find someone that actually likes the 18G.

at the end of summer I am goin to dump in some race gas and see what it will do

StolenTeg

roydogg, difinitely work on the eg or the integra and as for the G35, i think it one of the mose sexiest car in production right now so used it as a pimp ride

Ls InTeGrA RaCeR

damn...and people talk bad about the greddy kit????? Those are nice #'s and right about where I hope to be in a month with my Greddy Teg.

roydogg

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoostR41 &raquo;</TD></TR><TR><TD CLASS="quote">


profec b spec 1...... the car is perfect on the street powerband wise.....very very very light spike when it first hits full boost but settles and stays rock steady till about 6k then starts to fall off a bit down to about 1 bar at redline....

It is nice to find someone that actually likes the 18G.

at the end of summer I am goin to dump in some race gas and see what it will do</TD></TR></TABLE>

I have the avcr and when I went for my first tune I really didn't know how to use it but the next time I hit the dyno I'm gonna play with the boost controller since you can adjust it gear based and rpm wise. boost definately does fall off after 6k . I wonder if I put that external gate on will it hold it better?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StolenTeg &raquo;</TD></TR><TR><TD CLASS="quote">roydogg, difinitely work on the eg or the integra and as for the G35, i think it one of the mose sexiest car in production right now so used it as a pimp ride </TD></TR></TABLE>

But it'll be more pimp with double the power & torque . The G35 feels like a slug but definately has the low end trq. A boosted EG will just be anther boosted eg .