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Old 06-29-2002, 04:46 AM   #1
Code-7
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Default I want more top end. Tell me how!

I walked an Audi A6 2.7t all the way through third gear on the highway yesterday, until I hit 4th. Then it was almost like he hit nitrous or something, he started to gain on me so fast. It was a stock 2.7t (same motor and drivetrain as the S4. 250hp, six speed tranny) A6.

Seriously though, my friend's chipped VR6 did the same thing to me. As soon as I'm in 4th, he walks on by. By the time he hits 120 he's four car lengths ahead.

I want more top end. Which turbo and mods would give me a good balance between midrange and topend, with as little as possible loss on the low end? I don't want an all out turbo such as a PE1820. I just want to be able to shift from 3rd into 4th without feeling like I hit an overdrive gear.

Thanks!
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Old 06-29-2002, 05:38 AM   #2
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I personally like the VF23 as it is tried and tested over years the world over and a "sensible" size, and is relatively inexpensive.

There are various options - you can get your TD04 hyridized, go for VF turbos - VF24/28/29 moderate, VF23/30 a bit bigger, VF22 bigger still. The VF22 and the PE1820 are a bit top endy for me. There are some new APS turbos with mixed opinions. There are loads of threads on here about turbo selection.
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Old 06-29-2002, 09:35 AM   #3
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Default Re: I want more top end. Tell me how!

4th gear IS slightly overdriven.

I assume you already have a turboback and some dyno tuning of some sort?

that alone may get you the top end you need.
if not, then I would go with a VF29 or VF30

you will lose some low rpm power, but its not terrible.


Quote:
Originally posted by Code-7
I walked an Audi A6 2.7t all the way through third gear on the highway yesterday, until I hit 4th. Then it was almost like he hit nitrous or something, he started to gain on me so fast. It was a stock 2.7t (same motor and drivetrain as the S4. 250hp, six speed tranny) A6.

Seriously though, my friend's chipped VR6 did the same thing to me. As soon as I'm in 4th, he walks on by. By the time he hits 120 he's four car lengths ahead.

I want more top end. Which turbo and mods would give me a good balance between midrange and topend, with as little as possible loss on the low end? I don't want an all out turbo such as a PE1820. I just want to be able to shift from 3rd into 4th without feeling like I hit an overdrive gear.

Thanks!
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Old 06-29-2002, 09:36 AM   #4
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Default Re: I want more top end. Tell me how!

Quote:
Originally posted by Code-7
I want more top end. Which turbo and mods would give me a good balance between midrange and topend, with as little as possible loss on the low end? I don't want an all out turbo such as a PE1820. I just want to be able to shift from 3rd into 4th without feeling like I hit an overdrive gear.

Thanks!
it'll be kinda hard, considering 4th is an 'overdrive' gear. maybe a pe1818, or one of the new aps turbos.
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Old 06-29-2002, 10:14 AM   #5
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Code-7, im looking for the same thing i already have a stage zero and a m2 turbo back and i still want more! first gears powerfull up till 3rd even 4th is nice but always room for more. my pick is a vf-30 with the right fuel upgrades. You'll flyyyyy



-melo
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Old 06-29-2002, 10:20 AM   #6
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Code-7,

What are your mods? If you have none, or you only have an exhaust, an MBC or EBC will help alot. Set it at 14-15 psi above 4000 rpms and it will be a huge "top end" improvement.

If you want to upgrade the turbo, be prepared to spend some "extra" money on fuel pump, injectors, engine management, etc.

Good Luck.
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Old 06-29-2002, 11:58 AM   #7
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One word- PE1820F
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Old 06-29-2002, 01:10 PM   #8
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What they said... Are you stock or modded? If modded, what mods?
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Old 06-29-2002, 01:59 PM   #9
Code-7
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Completely stock as of now. Unless you consider shifter bushings and a k&n panel some serious power.

I have a vishnu stage 0 in mind, with a scoobysport turbo back to go along with it. I would like to get a blitz sbc-id as well to crank up my boost a tiny bit.
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Old 06-29-2002, 02:21 PM   #10
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well...looking at the quarter mile times...i used to hit 76 at the 1/8 and a 96 at the quarter


now with some upgrades im hitting 83 in the 1/8 and probably 103 in the quarter, you really can't gain a whole lot of top end with the AWD and the overdriven 4th gear...i suggest you get a new turbo though for more power up high
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Old 06-29-2002, 04:08 PM   #11
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Yeah what they said:

Top end speed : You've only got one turbo so you have to decide which it will run high end, mid range or low end.

The stock turbo is a low end turbo (ie give power at the low end of the spectrum).

Mid range turbos are: APS SR - 40, PE 1818, VF 30, VF 34

High end turbos are: PE 1820, Green Turbo, APS SR - 50, Garett 400 and above.

if you use the car daily and use it to commute I would strongly recommend at most a mid range turbo. The high end power turbos have, IMO, lots of lag, but are they great at 1/4 mile runs!

I would strongly suggest a fuel pump, injectors (some say not required, but what does it hurt?) and some sort of engine management.

I have vishnu 0 and I am looking at the APS SR-30 or VF 34...leaning toward APS but going to wait for the new "ECU" that jorge and others are hinting at.

Good Luck.
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Old 06-29-2002, 04:17 PM   #12
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definately upgrade injectors, fuel pump, and get unichip or ecu when getting a bigger turbo..... although some may not agree, when you are much over 250WHP on pump gas your stock injectors are at 99% duty
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Old 06-29-2002, 04:25 PM   #13
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From a previous LS1, Z28 owner don't try racing on the highway with a stock WRX. Just don't do it. Practically every other car on the road will either keep up or beat you. Not until I got my stage 4 setup (VF30) did I feel confident racing at higher speeds. I took out a big V8 sedan just yesterday at speeds I won't mention. Before my stage 4 (vf30 +18.5 psi boost) that would have never been possible.

I raced a new Mustang GT from 70mph up to about 130mph and I beat him big time so I know with the stage 4 setup its pulling pretty good top end.
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Old 06-30-2002, 02:32 AM   #14
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Code-7, ge the Vishnu Stage Zero its like a night and day difference between a stock wrx and a wrx with that kit! i love mine. then go for a full exhuast. turbosx seems to have a nice system 4" big mouth. then if your still not happy do what im doing. vf-30, sti injectors, Vishnu Fuel rails,lines, sard fpr,and pump. now thats gonna be a kicking subby =]...imo

-melo
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Old 06-30-2002, 03:39 AM   #15
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My surgestion now.


Upgrade turbo-Sti turbo (1200)
EBC (300)
Injectors (200)
Fuel Pump (300)
FMIC Inc Hoses (800)
6 Speed Sti tranny 2002 (4500)
Unichip (300)
Total $7,600

I have yet to see a dyno figures with just a turbo back exhaust system to make me think that the stock one would need replacing.

Not to bad. Should be good for an extra 1-10 MPH and possible 1sec off the 0-60 and a late 11 early 12 sec 1/4mile.
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Old 06-30-2002, 03:32 PM   #16
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Wheels, where do you get a six speed STi tranny at for $4500?
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Old 06-30-2002, 04:44 PM   #17
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Wheels,

DUDE! who is your supplier?!?!?
I would love to get injectors for $200 , unichip for 300, and 6-speed for 4500!

but the 300 for the fuel pump is a bit much
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Old 06-30-2002, 04:51 PM   #18
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Wheels missed a ritalin earlier.
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Old 06-30-2002, 06:28 PM   #19
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Cool Top end speed

All of you do realize don't you that the WRX is speed limited to 130mph. So i assume as you approach this speed fuel/air is cut off by the cpu. YOu need use a cpu or chip to bypass this.....

If you do this you will have your top end. The WRX is capable of atleast 160mph. Because at have of redline (3500rpm) in 5th gear 80 plus mph is achieved.

I think surely cheaper than upgrading turbos and everything else.....

STEVE
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Old 06-30-2002, 06:34 PM   #20
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Default Re: Top end speed

Quote:
Originally posted by commandoe99
All of you do realize don't you that the WRX is speed limited to 130mph. So i assume as you approach this speed fuel/air is cut off by the cpu. YOu need use a cpu or chip to bypass this.....

If you do this you will have your top end. The WRX is capable of atleast 160mph. Because at have of redline (3500rpm) in 5th gear 80 plus mph is achieved.

I think surely cheaper than upgrading turbos and everything else.....

STEVE
Man your a prirck!

The cars like a brick it aint going to do more than 145 with its wind risistance it aint nothing to do with the power. With no wind on a perfect day youd get possibly 149 tops before the wind resistance out powers the power of the car. Making it not go anyfaster. 130mph speed limiter my ass. 2 state troopers will testify that a wrx isnt speed limited.
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Old 06-30-2002, 06:51 PM   #21
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Humm... I don't even know if I should respond to your strange post Wheels...

You haven't seen a turbo back exhaust do better then the stock exhaust?? humm... 2.5" vs 3", 1 cat vs. 2, free flowing muffler vs. restrictive POS stock muffler...

You make the call.

Thomas
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Old 06-30-2002, 07:23 PM   #22
Wheels
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Quote:
Originally posted by PsycloneWRX
Humm... I don't even know if I should respond to your strange post Wheels...

You haven't seen a turbo back exhaust do better then the stock exhaust?? humm... 2.5" vs 3", 1 cat vs. 2, free flowing muffler vs. restrictive POS stock muffler...

You make the call.

Thomas
So you think its restrictive? Show me some flow specs of both. I wana see what the are rated at. No one has done so yet Like I said before show me some HP increases with just a turbo back and then I will be happy.

I stated my opinion not yours nor anyone elses. I disagree with you calling it a POS.
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Old 06-30-2002, 08:24 PM   #23
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Wheels, Look at the difference in the TurboXS stage 1 and vishnu 0, they make about the same whp, both use unichip but turboXS uses a turbo back...if that didn't yield some power, why include it?

Also Vishnu stage 1 includes a turbo back (with a hi-flow cat) to make another 40 whp - I don't doubt that Shiv Pathak dynoed every single piece (why he doesn't have a CAI, didn't see any dyno numbers to support it).

I haven't seen "turbo" magazine do a piece on the Subaru yet, but every N/A car that gets a turbo back gets at least a few WHP, but max is usually 10hp and min is around 6hp. I suspect that for a forced induction engine esp that has a larger turbo the gain is at least as great - I agree that if you don't increase flow, the gain will be minimal.

Good Luck.
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Old 06-30-2002, 10:39 PM   #24
commandoe99
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Cool top speed

"Wheels" I am a "prirk"? Can you atleast spell it correctly?Are you still in high school?

Wheels you obviously don't read much...... A domestic WRX is limited to 130mph that is fact not my opinion.....
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Old 06-30-2002, 10:57 PM   #25
QA Guy
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Default Re: top speed

Quote:
Originally posted by commandoe99
"Wheels" I am a "prirk"? Can you atleast spell it correctly?Are you still in high school?

Wheels you obviously don't read much...... A domestic WRX is limited to 130mph that is fact not my opinion.....
commandoe99,
I won't call you a "prirk", but please don't spread incorrect data.

An automatic WRX may be limited at 130MPH (I have heard this, but don't know for sure).

A manual WRX is NOT limited to 130MPH.
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