Integra21

how many of you have done this in order to run a 2.5in or larger downpipe?

does this solve creep/spike problems?

how much was it to get done, where at, and what all is involved?

thanks

nfn15037

A Dremel is all you need, there is a lot of material left around the hole without going to a larger flapper. I get no spiking or creep even at low boost w/ a 2.75 inch downpipe.

Bailhatch

I do it on T3s sometimes. it really helps. A dremel would take forever compared to a diegrinder with a carbide bit. If that all you have, check out http://www.american-carbide.com/ they have 1/8" shank carbide burrs (under solid carbide) so you can actually get some work done if all you have is a dremel.

Integra21

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nfn15037 &raquo;</TD></TR><TR><TD CLASS="quote">A Dremel is all you need, there is a lot of material left around the hole without going to a larger flapper. I get no spiking or creep even at low boost w/ a 2.75 inch downpipe.</TD></TR></TABLE>

do you happen to have any pics of the process? i dont have a dremel either

StolenTeg

How much boost are you plan on running

Integra21

no more than 10 EVER - prob 8psi regularly

nfn15037

A dremel takes maybe 5 minutes with a Carbide bit. I got mine @ Home Depot then smoothed everything out with a stone then with a sanding roll. I smoothed the entry into the wastegate from the turbine inlet. I never ran it without the hole ported, so I couldn't say if it crept before. Now running 17 PSI the wastegate is not open all that much anyways.

StolenTeg

Then you wont need to port your wastegate, hell you could run a 2.5 or 3 inch downpipe and boost will probably hold steady. The 18g are known to spike at higher boost level yes, but 8-10 psi is nothing it cant handle.

nfn15037

I think the main problem with spiking and creep is @ low boost. The wastegate needs to open a lot to divert exhaust gasses around the turbine, and if it can't flow enough it spins the compressor too fast creating an overboost situation. If you go with a 2.5 inch downpipe and a stock wastegate hole chances are it will creep at high RPMs and only 10 PSI. Take the few minutes and port the hole IMO.

Integra21

hmmm.......it prob wouldnt hurt anything to port it if i did right?

Integra21

ive also heard that the flapper was designed to only work with the 2" DP, so with a bigger DP, it causes spiking

Integra21

i would like to see pictures of porting this wastegate hole

there has to be some on H-T, i searched a little but no results

88da3

planning on doing this to my 18g. how do you port the flapper on the turbo?

Integra21

not exactly sure, but from what i heard you have to take the turbo off and the wastegate and port the hole from the wastegate with a dremel.

ill prob have a shop do it. is there any measurment to how much to port?

what is your turbo back set-up? psi?

StolenTeg

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Integra21 &raquo;</TD></TR><TR><TD CLASS="quote">ive also heard that the flapper was designed to only work with the 2" DP, so with a bigger DP, it causes spiking</TD></TR></TABLE>

You heard wrong, im running on the greddy kit for my b18b1, running 10 psi of boost, cast elbow&gt;2.5 inch downpipe&gt;3 inch test pipe&gt;3 inch exhaust, and not experience any spike that i know of.
People running around saying this and that about the greddy kit, but they actually never have one. the 18g do spike yes but that once you boosting a lot higher where the wastegate is too small to flow enough and i believe the cast elbow also restrict flow and causes spike too...

Integra21

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

You heard wrong, im running on the greddy kit for my b18b1, running 10 psi of boost, cast elbow&gt;2.5 inch downpipe&gt;3 inch test pipe&gt;3 inch exhaust, and not experience any spike that i know of.
People running around saying this and that about the greddy kit, but they actually never have one. the 18g do spike yes but that once you boosting a lot higher where the wastegate is too small to flow enough and i believe the cast elbow also restrict flow and causes spike too...</TD></TR></TABLE>

what kind of controller do you have? so you dont think i even need to port it?

StolenTeg

I used a cheap as Turboxs manual boost controller, i dont think you will need to port it but if you have time and tool to do it then why not but from my experience i dont think you will experience any boost spike.

Integra21

i just did a little search and found that the stock wg flapper hole is 19mm. how large should i port it to?

BoostR41

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nfn15037 &raquo;</TD></TR><TR><TD CLASS="quote">A dremel takes maybe 5 minutes with a Carbide bit. I got mine @ Home Depot then smoothed everything out with a stone then with a sanding roll. I smoothed the entry into the wastegate from the turbine inlet. I never ran it without the hole ported, so I couldn't say if it crept before. Now running 17 PSI the wastegate is not open all that much anyways.</TD></TR></TABLE>

kind of off topic but how much power did you make at 17psi?

my WG is totally stock and has no creep issues over 12psi....with the wastegate actuator doing the work it creeps to 12psi with the controller on it doesn't creep and has a very very very small spike as it reaches full boost then is perfect at 17psi


Modified by BoostR41 at 10:14 PM 5/21/2005

Integra21

how big to port the hole?

nfn15037

Measure the flapper, measure the hole, and enlarge the hole but don't go larger than the flapper. Smooth the entry from the turbine inlet into the wastegate hole. This is not that difficult!

Integra21

i prob wont do it myself, ill prob take it to a shop.

any pics?

Ls InTeGrA RaCeR

Sounds like a lot of fun for a silly 10 psi. lol

Integra21

well worth it IMO to fix potential spike

nfn15037

No I don't have pix, if you need hand-holding this isn't the job for you. If you can remove the turbo from the car, you can do this though. It is like a 10 minute job, why waste the $ paying someone else to do it?