Integra21

i have a 98 gsr with p28 obd1 hondata s200b, 18g turbo kit, and blitz sbc-id controller

i am keeping the greddy elbow and tiny DP

if i add a 2"-->3" test pipe to a 3" thermal, will i have ANY problems with spike or creep? of course it will be retuned also.

need some final info before i go buy my 550s and walbro

thanks

Integra21

also has the stock internal wastegate.

even with the sbc-id set at 10psi, the boost only maxes 7.3-7.5psi

urbansi

https://honda-tech.com/zerothread?id=1249813

same post kinda patience-patience

Integra21

yeah kinda, but i wasnt sure what he was going with his downpipe.

i didnt know if the stock downpipe would cause it not to creep or spike...

i know most people have 2.5-3" dp custom made but this is my DD and am not looking to do that much more to the engine.

i know i know Patience is a virtue

urbansi

there is an article on the kteller?? i think thats what its called. its somewhere in the boost up forms about custom 2.5dp for like $165ish.

https://honda-tech.com/zerothread?id=1238310
^^^^article on 2.5in dp^^^^

Integra21

you may have misunderstood, i am keeping my stock greddy downpipe

also the kteller greddy downpipe is only for the 15g kit for d-series.

Ls InTeGrA RaCeR

the downpipe is going to be the most important part to replace. the greddy dp is far too restrictive. have a custom 2.5 dp made and then run 2.5-3 inch test pipe.

Integra21

from what i have heard, replacing the downpipe with a bigger one, and keeping the stock greddy cast elbow would cause boost spike or creep. this is what i am trying to avoid for my DD

urbansi

i pm'ed him, or someone else, i think it was him that said that the b-series is made, or in production, and will be selling for $165, soon or is i think. as for creap and spike issues; search for any d-series people with internal wastegates that had a dp upgrade, and theres you answer.

Integra21

i have a b-series...

does anyone know the answer?

Tetronious

Theres a dude on here selling downpipes for b-series. I asked around and heres the old thread from it

https://honda-tech.com/zerothread?id=1234190

Scroll down theres a nice pic of it. I think he can sell you just the lower section if you want so you can keep the elbow. But like you said if it does cause spiking I have heard that porting the wastegate out is suppose to prevent that.

Tetronious
00 SI
Boosted

Integra21

yea i dont think i want to have to port the wastegate.

so the stock downpipe and a 2''-3" test pipe to a 3 in exhaust wont cause spike or anything?

Si Shane

if you dont touch the downpipe your going to get very little out of freeing up the rest.

shadow103rd

I would contact project Dc2 he makes downpipes for the B-series.....then you should get pretty good gains, from the 3 inch

Jon

Integra21

ok....

my tuner said that from just a test pipe(remember im running STOCK cat) , with my current set up i could expect ~30whp. so how would a test pipe and a 3" exhaust not yield gains?

also i dont want to port the wastegate hole in order to run a larger downpipe, for reliability reasons. (is there a write-up on this process anywhere?)

Will a larger (2.25 or 2.5)in downpipe cause me to spike or creep with my "stock" set-up? or will by Blitz SBC-ID be able to control that?

thanks

Integra21

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Integra21 &raquo;</TD></TR><TR><TD CLASS="quote">ok....

my tuner said that from just a test pipe(remember im running STOCK cat) , with my current set up i could expect ~30whp. so how would a test pipe and a 3" exhaust not yield gains?

also i dont want to port the wastegate hole in order to run a larger downpipe, for reliability reasons. (is there a write-up on this process anywhere?)

Will a larger (2.25 or 2.5)in downpipe cause me to spike or creep with my "stock" set-up? or will by Blitz SBC-ID be able to control that?

thanks</TD></TR></TABLE>

shadow103rd

You'll definitely see gains from a test pipe and a 3" exhaust. But while your down there, why not upgrade the DP. Thats my whole reasoning.

Jon

Integra21

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shadow103rd &raquo;</TD></TR><TR><TD CLASS="quote">You'll definitely see gains from a test pipe and a 3" exhaust. But while your down there, why not upgrade the DP. Thats my whole reasoning.

Jon
</TD></TR></TABLE>

i completely understand your reasoning, but my reasoning is that i dont want to have to port the wastegate hole and have to worry about spiking, esp. since this is my DD

Ls InTeGrA RaCeR

You'll definitely see gains from a test pipe and a 3" exhaust. But while your down there, why not upgrade the DP. Thats my whole reasoning.
Jon


That is exactly what I said before. The Greddy DP is far Too Restrictive. You are tring to force a 3 inch wide ***** into a Virgin *****! That's Too much for it to handle. Your motor isn't pushing enough out of the car which is actually causing you to lose HP. Bigger DP and Bigger Exhaust = Better Results! Turbo doesn't require back pressure. Also...I've never heard of anyone have boost spikes or Creeps with really good tuning. A good Tune means everything!

Integra21

if i upgrade the downpipe, i would have to port the wastegate hole in order to not get creep or spike (from what i hear)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ls InTeGrA RaCeR &raquo;</TD></TR><TR><TD CLASS="quote">You'll definitely see gains from a test pipe and a 3" exhaust. But while your down there, why not upgrade the DP. Thats my whole reasoning.
Jon


That is exactly what I said before. Your motor isn't pushing enough out of the car which is actually causing you to lose HP. </TD></TR></TABLE>

confused? contradicting...

RedRacer

I don't think you all are really grasping what he is saying. We all know that a bigger dp and exhaust makes more power on a FI car. He said he doesn't want to upgrade his flapper in his internal gate, so he is sticking with the GReddy dp. Why keep suggesting other dp's??

Ls InTeGrA: from my experience you are correct. you need to leave that DP alone if you don't want to upgrade the flapper. The minute you throw a 3" DP on there, you will creep. Seen it firsthand. Contrary to some peoples belief, tuning can't fix a boost creep issue, rather apply some type of bandaid slightly, because its a physical limitation of air flow.

I would think that with keeping the stock dp you would be okay with the bigger test pipe and exhaust, because you still have that bottleneck prior to the increased diameter. Are you running an aftermarket exhaust now?

Oh I see it in the sig now.. 2.25" exhaust.

A good point I see though from these other guys is that it might be a waste of time to upgrade to a bigger exhaust and test pipe if you are leaving the small DP. So I guess maybe the answer would be, don't bother upgrading it halfway if you can't upgrade it all..

Integra21

Brad, thank you for thouroghly reading my posts and answering my true question.

i understand both sides of the "argument"

i dont plan on making crazy hp, or even 300whp ever since this is my one and only daily driver.

i am running a Mugen exhaust which is 2.25in diameter and a stock cat.

would i be better off just replacing the cat with a test pipe and keeping the 2.25 in exhaust or upgrade the exhaust to a 3"?

i dont want to have any issues with creep...

how much more power would i make with the 3" exhaust and test pipe compared to the 2.25 exhaust and test pipe?? (both using stock greddy DP)

I'm Brad too

Tetronious

Not to bring this downpipe upgrade back into it. But what about a 2.5" downpipe. Im considering one myself just the lower piece so I can keep the A/C. Does this cause spiking too? I thought just the 3" downpipe did.

Tetronious

00 SI
Boosted

Integra21

from what i hear/read, anything bigger than the 2" greddy dp will cause spiking because of the wastegate flapper is for the 2" dp

correct me if im wrong though

i was also thinking of a 2.5" dp ---&gt; 3" exhaust when i found that it had caused spiking issues with other people on their 18g kit

RedRacer

Ahhh, another Brad. Cool stuff.

I believe you are correct. The flapper is designed to flow with the DP supplied with the kit. Even if they are upgraded, its still questionable how well it keep boost levels in check.

Your safest bet would probably be to just put a test pipe with your 2.25" exhaust if you really want to get something.

Or since your running Hondata, you could maybe retune for a few more psi &lt;shrugs&gt;?? That is if you really crave power.