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Old 05-18-2004, 12:33 PM   #1
V8VENOM
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Default STI over 145 mph??

I'm probably gonna run Fontana next year and having run there before in my old race car I know I can easily hit speeds over 150 mph. So, I need to know:

1. Why is the STI speed limited to 145 (about)? Hood scoop issue?
2. Without doing a custom chip burn can the speed limiter be fooled or disabled some other way?

Thanks, Rob.
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Old 05-18-2004, 12:54 PM   #2
Achilles38WRX
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i thought it was limited to 145 because of its 'brick' style aerodynamics.
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Old 05-18-2004, 01:27 PM   #3
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Quote:
Originally posted by Achilles38WRX
i thought it was limited to 145 because of its 'brick' style aerodynamics.
At least it is slicker than the 02-03 'tissue box' aerodynamics.
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Old 05-18-2004, 01:37 PM   #4
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Quote:
Originally posted by Achilles38WRX
i thought it was limited to 145 because of its 'brick' style aerodynamics.
nope its electronically limited.

Somthing was mentioned about the tranny overheating above 145mph awhile ago, but havent seen anything to confirm if thats true or the reason for the limit.
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Old 05-18-2004, 01:50 PM   #5
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Maybe the lawyers overheat at 145?

I'd be worried about lift, personally. The wing probably does a good deal for the rear, but what keeps the front on the ground?
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Old 05-18-2004, 02:03 PM   #6
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That what I thought those mini stubby front "spoiler" things were for ... I need to check out my latest German car magazine with their big STI Nurburgring test ... included a wind tunnel/smoke photo showing how the wings/aero's work ...
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Old 05-18-2004, 02:19 PM   #7
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that's why I bought me a V-limited front spoiler.

for the record though, its NOT due to aerodynamics. the car pulls hard all the way to the limiter. not.. that.. you know.. I know or anything.

Don
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Old 05-18-2004, 04:01 PM   #8
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what's the gearing good for?
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Old 05-18-2004, 04:02 PM   #9
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Quote:
Originally posted by 10th Warrior
what's the gearing good for?
multiplying torque

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Old 05-18-2004, 04:06 PM   #10
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I have a customer who bought his STI, lightly modded it, then drove across the US in it. He called me from Texas raving about the stability of the car at over 150 mph. His Speedometer stopped going up at 158...his GPS tracked him at 156.8.

This is the only instance I personally know of where an STI owner has tried to find a speed limiter, but his car was equipped with a turbo back exhaust, a manual boost controller, and a panel filter.

Again, he raved about how the STI was more stable over 140 than his WRX was at 120.

Kent
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Old 05-18-2004, 05:11 PM   #11
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So nobody really knows? Dang!

Tranny overheating -- doesn't make sense to me -- plus why have a rear differential temp sensor if the tranny is the "hot spot".

V-limited front spoiler -- do you have any pics of this unit and exactly how it is connected to the car's frame and/or subframe? I'm a little dubious on the functionality of all the "aftermarket" kits I've seen so far -- aimed more at looks rather than real durable functionality. I like Gary S. custom front splitter, but that is apparently pretty heavy. A front splitter will certainly slow the car down (if it is really doing it's job) -- but I agree, it certainly is NOT the reason for holding at 145.

158+ hmmm... sure this person didn't have a custom chip burn? Anyone else have actual experience with their STI over 145?

Guess I'll just have to see what happens -- just very worried about my scoop/hood coming off.
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Old 05-18-2004, 06:45 PM   #12
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I don't have pix of its applicatino on MY car, but there's tons of pics floating around. just search in the member's gallery. SUPPOSEDLY, when combined with all the other aero equip on the car, it reduces the front end lift to exactly 0. Hey, its STi. Besides, it looks soo damn good.

Don
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Old 05-18-2004, 09:00 PM   #13
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i thought they were limited to 155?
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Old 05-18-2004, 09:07 PM   #14
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I have had a customer take his to 150+mph and he said he still had more power to go....he is a gear head and his partner that night vouches for it. so I, as a salesman, wish I had something to show a customer on "Top Speed"



Thanks Shawn
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Old 05-18-2004, 10:03 PM   #15
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The current issue of the german magazine Sport Auto has a test on the STI. It said that the top speed is "boost limited @ 6,200 RPM in Sixth gear in order to protect the gearbox from high operating temperature." Redline is 7,500 except in 6th ... Supposedly the Euro STI has a longer final ratio ... 3.55 ... then the US model? Top speed is limited to 152 mph - in order to protect the gearbox.

The rear wing is apparently so effective that it produces lift in the front by pushing the rear down (too) hard.

Last edited by makofoto; 05-18-2004 at 11:03 PM.
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Old 05-18-2004, 10:56 PM   #16
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The limiter is at 147 (150+ indicated).

It isn't anything to do with the gearbox or aerodynamics.

Glenn
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Old 05-19-2004, 02:14 AM   #17
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Glenn,

Can you tell me what it IS rather than what it isn't -- I feel like I have to guess Door A, Door B, Door C

By process of elimination I down to:

1. Tires (not a concern since I don't use stock tires at the track)
2. Wheel bearings (big concern)
3. Motor can't handle extended durations at high boost
4. Scoop/intercooler produces excessive air cooling and exceeds operational parameters of the ECU?
5. Legal BS -- 147 was deemed "safer" than 165+ (but I'm not aware of any standards that require crash testing at those speeds)
6. Very bad drivetrain harmonics above that speed

I was going to suggest front glass also, but that is very much part of the car's aerodynamics.

Rob.
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Old 05-19-2004, 05:26 AM   #18
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Hit 150 on my speedo
closed course of course
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Old 05-19-2004, 07:52 AM   #19
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145 definitely seems to be artificial and arbitrary. I have taken my lightly modded WRX up to 138 many times on the back straight at Road Atlanta. I could easily exceed that, given more room. I've had no issues at all with either the factory hood scoop or the STI replacement. There are quite a lot of fasteners and brackets holding that thing down.

Wish I could give you the specifics on the STI...sorry. Why don't you bring it down to Road Atlanta and let's test it out?

Scott
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Old 05-19-2004, 10:21 AM   #20
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Quote:
Originally posted by V8VENOM
...5. Legal BS -- 147 was deemed "safer" than 165+ (but I'm not aware of any standards that require crash testing at those speeds)...
I think this is the real answer. There are many cars that arificially limit top speed for various reasons. 147 MPH translates to almost exactly 225 kph, which makes sense for an arbitrarily chosen top speed.
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Old 05-19-2004, 11:14 AM   #21
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In Germany ... where some of the cars ARE artificially top speed governed ... the magazine specifically pointed out that their STI was not restricted for "political" reasons ... but instead for "very practical reasons," ie. to avoid gearbox overheating. Don't forget that in Germany you can CRUISE at VERY high speeds. I remember my 1802 BMW (1971!) manual said that it's red line was 6,200 ... but for extended cruising, do not go above 6,000.
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Old 05-19-2004, 11:40 AM   #22
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Quote:
Hit 150 on my speedo. Closed course of course

... on your way down to pick up a clutch slave cylinder and some bolts...

Fitz
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Old 05-19-2004, 08:19 PM   #23
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Quote:
Originally posted by V8VENOM
Glenn,

Can you tell me what it IS rather than what it isn't -- I feel like I have to guess Door A, Door B, Door C

By process of elimination I down to:

1. Tires (not a concern since I don't use stock tires at the track)
2. Wheel bearings (big concern)
3. Motor can't handle extended durations at high boost
4. Scoop/intercooler produces excessive air cooling and exceeds operational parameters of the ECU?
5. Legal BS -- 147 was deemed "safer" than 165+ (but I'm not aware of any standards that require crash testing at those speeds)
6. Very bad drivetrain harmonics above that speed

I was going to suggest front glass also, but that is very much part of the car's aerodynamics.

Rob.
You are getting warm with 2 & 6. To repeat I am not sure if the issue remains on the 05.
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Old 05-19-2004, 10:37 PM   #24
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I've had my measely 2001 RS close to 130.. wish i had my GPS at the time to confirm it. This was at about 5500-5700 RPMs

And you think the 02-03 was tissue shaped..
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Old 05-19-2004, 10:44 PM   #25
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I run a bugeye Euro STi and have brought it up to 250km/h or 150mph, car still has power to pull, but I don't have to balls to go any faster.

With regards to the gearbox, we usually cruise around 200km/h for about an hour along the highway and the gearbox seems to be cooler than driving in the city.

For front downforce, I have the C-West lower air damper which seems to work great.
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