Pushing the 18G
09-25-2005, 04:34 PM
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Re: Pushing the 18G (urbansi)
Good luck with making everything happen for under 2k. That is always a really hard thing to do.
Bullseye makes a great cast steel exhaust housing for the 18g that will run w/ a larger 38mm wastegate and a slightly larger a/r to let the turbo make a bit more power. The compressor on the greddy 18g is a bit larger than most give it credit for, and will flow 300whp worth of air without much trouble.
Bullseye makes a great cast steel exhaust housing for the 18g that will run w/ a larger 38mm wastegate and a slightly larger a/r to let the turbo make a bit more power. The compressor on the greddy 18g is a bit larger than most give it credit for, and will flow 300whp worth of air without much trouble.
09-25-2005, 05:59 PM
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Re: Pushing the 18G (Si Shane)
thats interesting, i have one concern though, i am afraid that once the motor gets pulled that there could be some cylinder scoring, and while i planning on ball honing the walls i am worrying about oil consumption etc. in that case the budget may need to be a little higher.
any other suggestions
any other suggestions
09-25-2005, 06:03 PM
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Re: Pushing the 18G (urbansi)
I'd go with a little bigger injectors just to be on the safe side.. The 450s are BARELY good to 300whp. Atleast get some 550s. Other than that.. crank up the boost! 
09-25-2005, 07:26 PM
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Re: Pushing the 18G (ccivic)
#'s in sig with the crap greddy exhaust housing. gettin a bigger housing on that side will free up a lot of power. also I have no porting done at all. that is on pump gas too by the way
09-25-2005, 07:44 PM
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Re: Pushing the 18G (BoostR41)
yea.. get a bigger exhaust housing.. We switched to a DSM housing and it made a big difference, even increased spool. We are hopping to maybe touch 400 with the 18g. But we will see..
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09-26-2005, 05:22 AM
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Re: Pushing the 18G (urbansi)
Hey Urban,
I just got done with my rebuild. I would go with a higher CR than 9.0:1. I have the SRP 9.9:1 and they still have great streetability when I am not in boost. SRP is made by JE. I have RC 550's on the 18G setup and they are nowhere close to max duty even at 11 psi. I even use the stock fuel pump and it's not having a problem at all. I am having trouble with something above 6500 rpm's though. Go slow with that rebuild. Follow the helms, and be patient with the piston rings. That is a critical part in the rebuild.
I just got done with my rebuild. I would go with a higher CR than 9.0:1. I have the SRP 9.9:1 and they still have great streetability when I am not in boost. SRP is made by JE. I have RC 550's on the 18G setup and they are nowhere close to max duty even at 11 psi. I even use the stock fuel pump and it's not having a problem at all. I am having trouble with something above 6500 rpm's though. Go slow with that rebuild. Follow the helms, and be patient with the piston rings. That is a critical part in the rebuild.
09-26-2005, 07:35 AM
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Those are some numbers you guys are getting. I just picked up a used greddy kit got gsr hatch. Anyone have to rebuild their 18g. Are you guys still using the internal wastegate? Keep up the good work.
09-26-2005, 10:43 AM
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Re: (93si-hybrid)
I am selling mine over winter just because I changed the direction I want the car to go in(I want over 500whp). snag up a TD06H set of wheels and it will make some pretty good power and port the housings. also get a better manifold. I think you can get the mini-me tubular mani with the greddy flange on it
09-26-2005, 11:02 AM
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Re: (JDMisGOOD)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMisGOOD »</TD></TR><TR><TD CLASS="quote">You can easily get 300whp out of the 18g.</TD></TR></TABLE>
A dsm 18g yes a greddy 18g it is a bit harder because the exhaust housing/wheel is smaller.
A dsm 18g yes a greddy 18g it is a bit harder because the exhaust housing/wheel is smaller.
09-26-2005, 12:17 PM
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Re: (BoostR41)
i looked into having a tublar manifold and dp combination put together but for $800 i think that money could go else where, my main concern is getting the right internals and making sure the car is tuned first, then push the 18g
09-26-2005, 12:18 PM
#18
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Re: (BoostR41)
A 3 inch downpipe without the cast Greddy elbow is hands down the bext thing you can do for this setup.
ATP Turbo sells a nice Vband adaptor for T25-flanged turbos
ATP Turbo sells a nice Vband adaptor for T25-flanged turbos
09-26-2005, 12:22 PM
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Re: (nfn15037)
any link? what was the final price once made?
EDIT: anyone had trouble pushing boost with the stock wastegate, i have heard rumors???
i love this thread
EDIT: anyone had trouble pushing boost with the stock wastegate, i have heard rumors???
i love this thread
09-26-2005, 12:55 PM
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Re: (nfn15037)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nfn15037 »</TD></TR><TR><TD CLASS="quote">A 3 inch downpipe without the cast Greddy elbow is hands down the bext thing you can do for this setup.
ATP Turbo sells a nice Vband adaptor for T25-flanged turbos </TD></TR></TABLE>
very nice but defeats the purpose I got a greddy kit in the first place(retain AC)
ATP Turbo sells a nice Vband adaptor for T25-flanged turbos
</TD></TR></TABLE>very nice but defeats the purpose I got a greddy kit in the first place(retain AC)
09-26-2005, 01:07 PM
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Re: (BoostR41)
had my car for almost 3 years now and have only used ac twice ever, so i am not that concerned.
anyone had trouble pushing boost with the stock wastegate, i have heard rumors???
anyone had trouble pushing boost with the stock wastegate, i have heard rumors???
09-26-2005, 01:28 PM
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Re: (urbansi)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by urbansi »</TD></TR><TR><TD CLASS="quote">had my car for almost 3 years now and have only used ac twice ever, so i am not that concerned.
anyone had trouble pushing boost with the stock wastegate, i have heard rumors???</TD></TR></TABLE>
it does fall off after vtec crossover to about 14psi on mine. I use AC a lot so I kept the elbow and went 2.5"DP->3" exhaust
anyone had trouble pushing boost with the stock wastegate, i have heard rumors???</TD></TR></TABLE>
it does fall off after vtec crossover to about 14psi on mine. I use AC a lot so I kept the elbow and went 2.5"DP->3" exhaust
09-26-2005, 01:53 PM
#24
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Re: (BoostR41)
I added a small spring between the flapper arm and the actuator bracket to help hold the WG closed @ high boost. I have been dragging my feet on buying a Forge Motorsports actuator, but maybe soon. With the extra spring it will hold 18 lbs no problem. I used to set the actuator rod really tight and it could creep up to about 17-18 but with the extra spring it makes base pressure on the WG about 13 lbs then I use my MBC from there, holds boost great. The Vband adaptor is like $100 and the DP is a custom piece.
Also, to the original poster, you asked for opinions. Get some nice RC saturated injectors and Crome. 450s are just barely large enough, especially if they are used/of unknown quality. I would also port the wastegate for sure, maybe even install alarger flapper. But remember, larger flapper = more surface area for exhaust gas pressure to push againsi, so it will require more wastegate stiffness.
Also, to the original poster, you asked for opinions. Get some nice RC saturated injectors and Crome. 450s are just barely large enough, especially if they are used/of unknown quality. I would also port the wastegate for sure, maybe even install alarger flapper. But remember, larger flapper = more surface area for exhaust gas pressure to push againsi, so it will require more wastegate stiffness.
09-26-2005, 02:07 PM
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Re: (nfn15037)
hmm thanks for the info, i already have 310's in my car, would rc's 550's snap into the same harness the 310's are in. the wastegate for sure will be ported and for the $20 it costs to upgade the flapper to a 34mm flapper ( http://www.slowboyracing.com/more.php?id=108) i may just do that too while i am in there, also have been thinking about doing an adjustable actuator, anyone tried that at all http://www.slowboyracing.com/s...=1462