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Old 09-23-2003, 01:06 PM   #1
OneArmedScissor
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Default diff between a 300hp wrx and 400hp wrx? (joke...and serious q inside)

nothing!
they both run 12.8


sounds like an old supra joke.



so the serious question here is what can be done to avoid having such bad lag that the car can't spool the larger garret turbochargers and you end up with another 12.8 -13.1 second car with lots of power in 5th but no streetable power in any other gear?


can tuning help reduce lag? what headers reduce lag the most? i know from MANY sources that the stock header design on the wrx is piss poor.

also...what are some other ways (besides the obvious n20) to reduce lag on a big turbocharger setup?

changing the housing?

reason being is i read sport compacts article on the various tuner wrx's out there and the highest hp wrx ran a very average timeslip and probably made terrible power on a road course or autocross course as well.


what kind of trick sare out there to keep this from happening?

and are there any adapter kits to fit a t3 60-1...i hear that turbo would spool almost as quick as stock and make much more power than the vf30.

reason being that im looking at a cheap vf30 right now...but am wondering what other options are out there.

-Milin (looking to max out his sti injectors and walbro fuel pump which i am installing asap!)
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Old 09-23-2003, 01:15 PM   #2
M32WRXin3seconds
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Default FP18G is the same price...

and it can do between 20 and 75whp more than a vf30 depending on your tune, the gas, and your mods. the spool seems to be pretty early, all i have heard is positive reviews from them
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Old 09-23-2003, 01:21 PM   #3
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Quote:
can tuning help reduce lag?
Absolutly
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Old 09-23-2003, 02:03 PM   #4
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A forced performance Green recently made 425 awhp and made an 11.9 second pass at 121 mph on a completely ****ed clutch. And yes tuning can help to reduce lag.
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Old 09-23-2003, 02:05 PM   #5
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Default Re: diff between a 300hp wrx and 400hp wrx? (joke...and serious q inside)

Quote:
Originally posted by Milin


reason being is i read sport compacts article on the various tuner wrx's out there and the highest hp wrx ran a very average timeslip
This is becuase high power does not necessarily equate to high times. The powerband is important. Also, not all of these cars a tuned to be drag cars, a different tune in the same car will yield a quicker time.
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Old 09-23-2003, 02:17 PM   #6
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Default Re: Re: diff between a 300hp wrx and 400hp wrx? (joke...and serious q inside)

Quote:
Originally posted by JewPac42


This is becuase high power does not necessarily equate to high times. The powerband is important. Also, not all of these cars a tuned to be drag cars, a different tune in the same car will yield a quicker time.
all very very good stuff...however i think that particular wrx's powerband was so high that it was good for highway racing and thats about it. thats what im hoping to avoid. the fp turbo shows a LOT of promise I just worry about gearbox health.

kind of like using a sniper rifle for skeet shooting....

anyways...i was hoping i could find a snail with enough lag that it wouldnt fry first gear (it would not spool too quickly in 1st...that would help) under normal use (i dont plan on dragging the car more than once or twice a year)

id like to see some dyno plots.


also...what kinds of tunes can you have for the cars? Can you tune the car to spool early and have a nice smooth "sports-car" powerband with the fp 18g?

can it be tuned to spool around 3k with a full compliment of exhaust and header mods?

also...anyone graphed out their lag with headers and a tune?
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Old 09-23-2003, 02:52 PM   #7
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Can you get positive boost pressure at 3k rpms with an 18G, i would sure think so, but is that going to be the point at which you are thrown back into your seat? Nope.. however with good tuning you can bring that point down to a reasonable rpm, maybe 4k rpms honestly i havn't had the chance to tune a car with an 18G so i wouldn't know.

I think your confusing boost threshold with achieving peak boost pressure or high boost pressure.

The lag not hurting 1st gear is not going to work, because when that turbo spools up the car is going to rip towards redline in 1st gear I know it.
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Old 09-23-2003, 02:54 PM   #8
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The only car I have ever been in with an 18G had full boost at 3500 RPM, however full boost was only 15psi and the car had a 2.4 stroker motor, not the stock 2.0. So based on that car I would estimate that a 2.0 would recieve full boost at around 4000 RPM as stated above.
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Old 09-24-2003, 01:56 AM   #9
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My 18G on a flat road in third gear did the following boost levels with a roll-on at 2750;
3132=4.7psi
3465=8.0
3827=12.5
4182=18.6
4504=20.4
I have set my utec to hit max at 20psi or it would go higher. The car is fast and seems to actually out-race the the boost in third gear, I know it would actually build boost quicker in 4th or 5th gear.
Bob
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Old 09-24-2003, 01:33 PM   #10
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In a 4th gear pull I logged

18.5 psi at 3800rpms
22psi at 4100 rpms
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Old 10-01-2003, 02:00 AM   #11
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Default Headers

Straight from Nathan's (TurboXS) mouth:

"Been there, done that! Every header we tested on the dyno sucked. I had the HKS headers on my car for a little while and hated every minute of it. I went back to stock manifolds after about a week and have been on stock manifolds ever since. "

I have some designs floating around for a race header that wouldnt be too fun for oil changes that might help spool but will reduce ground clearance and make a few other things a whore. I am gonna build it and see.
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Old 02-18-2014, 08:22 AM   #12
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Quote:
Originally Posted by MinesFaster View Post
Straight from Nathan's (TurboXS) mouth:

"Been there, done that! Every header we tested on the dyno sucked. I had the HKS headers on my car for a little while and hated every minute of it. I went back to stock manifolds after about a week and have been on stock manifolds ever since. "

I have some designs floating around for a race header that wouldnt be too fun for oil changes that might help spool but will reduce ground clearance and make a few other things a whore. I am gonna build it and see.
I feel like headers are more of a thing for guys trying to achieve 500-600whp figures anyways...
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Old 02-18-2014, 08:42 AM   #13
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11 year old thread bud
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Old 02-18-2014, 09:15 AM   #14
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Originally Posted by CHAOS22 View Post
11 year old thread bud
LOL!

Talk about bringing a thread back from the grave, holy crap
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Old 02-18-2014, 09:49 AM   #15
J wrx11
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wow ..
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Old 02-18-2014, 11:41 AM   #16
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Lol how the hell did I even stumble upon this? My bad my bad
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Old 02-18-2014, 12:20 PM   #17
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Quote:
Originally Posted by QsR View Post
I feel like headers are more of a thing for guys trying to achieve 500-600whp figures anyways...
A header (we only have one, not two like v6/ v8 guys) is for ANYONE. Doesn't matter what power figures you're trying to make. There are no rules saying you need to want to make 500+ awhp if you have a header.

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Originally Posted by QsR View Post
Lol how the hell did I even stumble upon this? My bad my bad
You must have been REAL bored to go that far back in history
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Old 02-18-2014, 07:07 PM   #18
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Quote:
Originally Posted by mtarr07 View Post
A header (we only have one, not two like v6/ v8 guys) is for ANYONE. Doesn't matter what power figures you're trying to make. There are no rules saying you need to want to make 500+ awhp if you have a header.



You must have been REAL bored to go that far back in history
Okay gotcha. And I honestly don't know how the hell I stumbled upon this hahah. But just one question for you, I'm curious to know why you're only calling it an exhaust "header", I mean aren't headers pipes for each exhaust port from each cylinder, giving it 4 pipes, or (4 headers)?
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Old 02-19-2014, 01:08 AM   #19
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Quote:
Originally Posted by QsR View Post
Okay gotcha. And I honestly don't know how the hell I stumbled upon this hahah. But just one question for you, I'm curious to know why you're only calling it an exhaust "header", I mean aren't headers pipes for each exhaust port from each cylinder, giving it 4 pipes, or (4 headers)?
No, treat a header as an object/ an item. You have one header. Like guys with straight 6's (inline 6 cylinder), have one header with 6 ports/ pipes/ whatever you want to refer to them as. We have a header with 4 ports. A v8 has two headers, each with 4 ports, etc etc.
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Old 02-19-2014, 10:39 AM   #20
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Okay thanks for the explanation mtarr07, makes sense
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Old 02-23-2014, 01:31 PM   #21
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hehe, 11 year lag, we're not even discussing the same Subarus anymore!
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