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Old 08-20-2010, 04:37 PM   #26
Bariga
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^ good for you
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Old 08-20-2010, 05:06 PM   #27
k mier
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I'm seriously considering a twinscroll 35r setup for my next build being under the impression spool is considerably quicker than it's rotated equivalent. Not to be an azz, but why so laggy?
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Old 08-20-2010, 05:38 PM   #28
john 1badSTI
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Quote:
Originally Posted by Bariga View Post
^ good for you
HEY hey don't take what I said the wrong way I am not down playing your car I am just trying to say that your big cams are not the reason for how it spools.
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Old 08-20-2010, 05:49 PM   #29
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Quote:
Originally Posted by k mier View Post
I'm seriously considering a twinscroll 35r setup for my next build being under the impression spool is considerably quicker than it's rotated equivalent. Not to be an azz, but why so laggy?
Being dyno'd in 3rd gear probably has something to do with it bud.
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Old 08-20-2010, 06:40 PM   #30
john 1badSTI
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^^^^you may be right didn't catch what gear the pull was done in usually done in 4th with a 6 spd
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Old 08-20-2010, 06:41 PM   #31
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Quote:
Originally Posted by john 1badSTI View Post
HEY hey don't take what I said the wrong way I am not down playing your car I am just trying to say that your big cams are not the reason for how it spools.
Yeah, definetly not the cams. I wouldnt even consider 272's "big". I am running 280's my self but a smaller bolt on turbo.

Maybe its just the dyno?

Does it spool the same on the street Bariga?

Either way 500 wheel is 500 wheel

Chris
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Old 08-20-2010, 06:42 PM   #32
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Quote:
Originally Posted by wrxwhat View Post
Being dyno'd in 3rd gear probably has something to do with it bud.
Ohh, very good point. I didnt see that.
That explains A LOT.
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Old 08-20-2010, 07:02 PM   #33
Bariga
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ill post some logs
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Old 08-20-2010, 07:15 PM   #34
Nuke209
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I like...ALOT!
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Old 08-21-2010, 12:24 AM   #35
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Quote:
Originally Posted by john 1badSTI View Post
I am running bigger custom kelford avcs cams than 272's with a single scroll hta86/.82 and see over 20 psi by 4100 so I am not going to point the finger at the cams being the reason for laggy spool-up.
which cams are you one? what's the lift? just curious, not doubting. you are also on a .82 Ar. You are also like 16% or so smaller turbine AR than this engine...just saying.
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Old 08-21-2010, 01:20 AM   #36
john 1badSTI
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yeah I know but the hta86 does have a 4mm bigger compressor wheel also.And the cams are right about 282 int and exh with 11.3mm lift on int and 11mm on exh.I would have to look the specs up on the card for the .050 duration.And the cams were decided on by Kevin Ban himself,I gave him hwat I had and what I wanted and thats what he grnd for me.So far these cams have allowed me to pick up almost 40mph on the back half of the 1/4 on 30 psi.
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Old 08-21-2010, 10:37 AM   #37
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gotcha! What CR are you on? continuing the curiosity information probing
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Old 08-21-2010, 02:05 PM   #38
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The spool doesn't look too bad for 3rd gear and a 1.06 a/r housing. This is about how a .82 a/r single scroll would spool in 3rd gear.

-- Ed
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Old 08-23-2010, 01:23 AM   #39
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Im running the Kelford 272s as well, you can get it to spool up a bit more quickly but you and Dom are going to have to sit down and play with the AVCS a little bit, when you have modded cars like ours it takes more than a day of tuning to get it running perfect.
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Old 08-23-2010, 02:06 AM   #40
Bariga
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Yeah that could be true, your dyno log looks very good maybe its because you have a BorgWarner
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Old 08-23-2010, 05:41 AM   #41
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Is there a 4th gear pull graph? 20psi @ 5000rpm is quite laggy imo.
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Old 08-23-2010, 08:03 AM   #42
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Nice numbers.
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Old 08-24-2010, 01:00 AM   #43
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I was honestly a little surprised by the lack of spool. I played with the AVCS quite a bit and it didn't yield much for gains in spool. Not sure why...

we have a few things to work on still with the tune, so I'll probably be giving the tune another shot pretty soon to see if I can lean it out a bit during spool and knock it down a few hundred rpm. I wonder if the 90 right off the turbo is affecting the performance much.

Interesting thing though, my 2.3L gets full boost by 4850rpm on a standard 35R .82 hotside. Mine has a small exhaust cam that really helps get the turbo spinning, but chokes out the top end. The CNC porting in my heads helps a bit too. You can see the power curve on this has practically no choke at all. I had really anticipated that the turbo would come in a lot sooner. I do need another 35R for my other car, so maybe I could buy this turbo from the OP and convince him to switch to a BW.

Regarding 3rd gear. This is an 07 so 3rd isn't as short as other sti 6mt's. I tune in 4th on the 07's as well. I use as many gears as possible to ensure the tune is ideal. I'll have to see if I have a graph from that on my dyno computer. One thing to think about though, if I published a graph of 4th gear, it wouldn't represent what the car does on the road. [disclaimer] With 07's, you have to be hauling ass to actually use 4th (>85mph) and it wouldn't/shouldn't happen on public roads. [/disclaimer]

As far as RPM is concerned: we blueprint our motors at MPS and perform a few mods to the oiling system. This car held over 85psi at 8500rpm. Looking back I should have shimmed the pump a little- in addition to the porting/polishing/deburring- to bump the pressure to 95psi (85 is the relief setpoint of this pump). This engine also has longer rods which help the engine maintain reliability at higher rpm.

Head work: When we put the +1mm valves in the head, we enlarged and radiused the valve seats. I did a little bit of cleaning up on the bowls as well to help the airflow.

anyway, we'll be at this car some more to see what we can squeeze out of it.
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Old 08-24-2010, 01:02 AM   #44
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Quote:
Originally Posted by alcoolaid View Post
Is there a 4th gear pull graph? 20psi @ 5000rpm is quite laggy imo.
your spool is remarkable in your car. Mostly due to the different turbo, smaller exhaust cam and ported heads.
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Old 08-24-2010, 03:38 AM   #45
Bariga
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Both turbos are about the same acording to Jeof at Fullrace, DW takes lead on the race gas though! Maybe Alcooland had better gas 94 octain?



http://forums.clubrsx.com/showthread.php?t=611432


Quote:
Originally Posted by Maxwell Power View Post
your spool is remarkable in your car. Mostly due to the different turbo, smaller exhaust cam and ported heads.
he runs the same cams on his car maybe porting help a bit, Phil@Elementting says that poring doesn't do much rather then heaving +1 valves and big cams.

Or maybe hydra i holding me back some how////

Last edited by Bariga; 08-24-2010 at 04:06 AM.
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Old 08-24-2010, 12:00 PM   #46
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frankly I don't believe that graph. I've seen both these turbos in person on many occasions in all sorts of setups. The BW spools faster every time.
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Old 08-24-2010, 01:50 PM   #47
Bariga
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For the BW ill need to change downpipe a little, ill wait to see leons graph!

Last edited by Bariga; 08-24-2010 at 04:17 PM.
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Old 08-25-2010, 05:59 AM   #48
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Quote:
Originally Posted by Bariga View Post
For the BW ill need to change downpipe a little, ill wait to see leons graph!
When is leon's car done?
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Old 08-25-2010, 08:01 AM   #49
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Should have run the mild 2.34 block with bigger cams....that motor is the money!
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Old 08-25-2010, 12:21 PM   #50
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Leon's turbo setup is installed. We are finishing his fuel system upgrade currently and his intercooler piping.

Soon as that's all done, he'll be on the dyno.
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