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    Thread: Building a Street Prepared Mk1 TT

    1. Banned madmax199's Avatar
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      06-09-2010 10:21 AM #1
      The Car:
      - 01 TT quattro

      Suspension:
      - 17X10 5zigen fn01rc
      - 315 v710 front, 275's rear
      - Revalved H&R RSS (listed for R32) with custom spring rates
      - Home made front ball joint extenders with caster offset (allows me to run up to 8 degrees of camber)
      - Modified stock front swaybar with about half the stock rate and stock rear swaybar
      - Madmax rearadjustable control arms

      Engine:
      - 42 Draft Design intake (with velocity stack and heat shield)
      - Larger S4 maf housing with stock sensor and 3 bar of fuel pressure
      - Generic ECU chip
      - Wastegate actuator modified with 2 external 5lbs springs
      - Converted to E85 ethanol
      - Custom 3" turbo back exhaust with 42 Draft Designs downpipe
      - Labonte Maf controlled Water injection kit(running straight distilled water via 4 M1 nozzles pre and post throttle body)
      - 630cc injectors, 255 external fuel pump
      -Timing advanced +13.5* on top of base flash
      -Mitsubishi Evo modified metal recirculating valve
      -SMIC delete(with low iat coming from water injection, two SMIC were redundant and an auto-x car could use some faster spool by reducing pressure loss)


      Other:
      - Slightly massaged front fenders for tire clearance
      - 4 point harness
      - Home made front lip
      - 15 lbs DEKA battery

      Future mods:
      -Put the car on a diet with lighter seats/brackets, etc.
      -LSDs and maybe a competition haldex controller if proven legal in street prepared(I'm sending a letter to clarify legality)
      -Passenger side facing Extrude honed IM with 70mm TB so I can reduce the amount of piping by half.

      The mission:
      Build a competitive street prepared TT for next year when the car is likely going to be moved from CSP to DSP.

      The car as of right now is in the beginning of it's R&D and has plenty of things that need to be improved.
      A few guys I know, are either building for street prepared or have an SM TT that could share some setup info so I'm starting this thread so we have a place to do so. I'm sure some here would also have some ideas and input that will be welcomed.

      After 2 autocrosses the car corners flat and rotates nicely and doesn't understeer unless driver induced.
      My issue right now is that the car shuts power down when brake and throttle overlap(left foot braking) and it's killing my times, so if anyone dealt with that on newer VW or Audi what did you come up with?




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      Last edited by madmax199; 11-12-2011 at 01:11 PM.

    2. Member XvwX's Avatar
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      06-09-2010 02:41 PM #2
      I wish I had some info for you so instead I'll just show you my support with a "HELL YEAH BROTHER!!".
      Best of luck and PLEASE keep us updated!

    3. Banned madmax199's Avatar
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      06-09-2010 02:56 PM #3
      thanks!

    4. 06-09-2010 09:21 PM #4
      I think the TT will dominate DSP.


      I'm interested in your tire selection. You have the 6 speed, so your gearing was different than mine, but where are those tires putting the top of second for you? For me, I wanted the shorter 285/30/18's as they were taller than the "almost-tall-enough 275/35/15's", but also in a more wallet friendly V710 vs. A6.

      This was my car:



      I'd be tempted to build a TT225 for DSP with how much fun my GTI was.

      Where in NY are you running? If you're running out on Long Island, come out to some NNJR events.

    5. Banned madmax199's Avatar
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      06-10-2010 08:42 AM #5
      I'm in long island, and now that NNJR is trying to be at the meadowlands I'll be coming to their events but the Englishtown is kind of a stretch with all the traffic!

      I choosed the taller 315/17 over the 285/18 because of the gearing that becomes problematic in the faster national tour type of events. I haven't calculated what my top of second gear speed is with the 25.4" tall 315 but I'll take every extra mph I can get!

    6. 06-10-2010 12:44 PM #6
      I'm wondering why you started with a convertible? Maybe you already had it?

      Anyways, I think you're off to a great start. What are your spring rates?
      You should also consider either a Haldex orange controller, or a custom solution. Wait...is that SP legal?

      F/R LSD's make a huge difference in the overall behavior of the car, so if your wallet allows that, I would wait to mess around with the suspension till the driveline is finished.

    7. 06-10-2010 12:49 PM #7
      The biggest enemy of the TT is weight, so I would start looking at how to shed some. If you can make a quick disconnect for the exhaust, right behind the driver, that should help some in the lightening department and free up a few ponies as well.
      What sort of downpipe do you use? Why just a generic chip and how does it behave? There is good power to be extracted from the Ko4, but it has a habit of being very peaky. So look for a solution that gives a relatively smooth boost delivery but a high hp.

      Last I remember putting on 10 inch wheels, they weren't offset that far out. Is there any more room inside the fender?

    8. 06-10-2010 02:40 PM #8
      You should also consider either a Haldex orange controller, or a custom solution. Wait...is that SP legal?
      Not SP legal. And to the OP what is the offset on those wheels?

    9. Banned madmax199's Avatar
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      06-10-2010 02:57 PM #9
      The car is actually my wife's TT, I already have an XP evo an EP saturn but one day I just decided that it would make a cool Street Prepared car!

      A rear LSD and Haldex controller is in my list of mods but not on this season's budget, maybe I should edit the original post and add a to do list.

      My spring rates are:
      685lbs front with a wheel rate of 657.87lbs/in (modified front bar)
      1150lbs rear with a wheel rate of 645.38lbs/in (no rear bar)

      Edit: I opted to bring the stock rear swaybar into the equation in an attempt to get a little more rear wheel rate(I am still not getting any rear lift with the stock bar)
      Last edited by madmax199; 02-18-2011 at 01:01 PM.

    10. Banned madmax199's Avatar
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      06-10-2010 03:06 PM #10
      The car is sitting at 3200lbs right now, the exhaust is pretty light with a straight 3" pipe and a muffler. The bulk of the weight reduction is going to come from the seats and a light battery, that would save me about a 100lbs and put the car at 3100lbs.

      The generic tune came with the car and I plan on advancing the timing map in the near future to match the race fuel I run.
      Last edited by madmax199; 06-15-2010 at 08:00 PM.

    11. Banned madmax199's Avatar
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      06-10-2010 03:17 PM #11
      CC GTI, what makes the haldex controller not legal in SP?

      The offset is +10 on the wheels in the first picture, I since pushed the rear wheels inboard since there was plenty of room. The front however have 2mm of room between the tires and the coilovers and maybe more with less negative camber.



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      Last edited by madmax199; 06-10-2010 at 03:22 PM.

    12. 06-11-2010 01:06 PM #12
      Its not legal because there is no place in the rules that say you can add the controller. I believe the controller would bump you to SSM.
      I ask about the offset on the wheels because it look like you are having the same issue that DIAF and I were have when setting up the GTi. I wonder how big the shock bodies are on your coilovers. We originally were use Teins and had to have some crazy spacers machined to get the wheels to fit. After more research we found that going to Koni Yellow with GC coilover kit gave us more room to pull the wheel in closer helping bump steer. We also used camber plates as our *one* adjustment and did not go the route of the of the LCA adjusters.

    13. Banned madmax199's Avatar
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      06-11-2010 03:17 PM #13
      The shock body is not big at all and even if it was smaller it would have to be like a pencil in diameter to allow you to effectively bring that front wheel in-ward another inch.

      I don't know if your closest point between the tire and the shock is the collar or the actual body but I had to run shorter springs to move the collars above tire height, so you could check that too. I just see it as one of the design flaws of the chassis and work around the potential bump steer!

      I stayed away from the camber plates and fabricated my own BJ exenters because they didn't offer enough adjustement to justify the $400 investement. I don't know about the GTI but the TT need way more than 3" of negative camber according to pyrometer.

    14. 06-11-2010 05:10 PM #14
      Quote Originally Posted by madmax199 View Post
      The shock body is not big at all and even if it was smaller it would have to be like a pencil in diameter to allow you to effectively bring that front wheel in-ward another inch.

      I don't know if your closest point between the tire and the shock is the collar or the actual body but I had to run shorter springs to move the collars above tire height, so you could check that too. I just see it as one of the design flaws of the chassis and work around the potential bump steer!

      I stayed away from the camber plates and fabricated my own BJ exenters because they didn't offer enough adjustement to justify the $400 investement. I don't know about the GTI but the TT need way more than 3" of negative camber according to pyrometer.

      The Konis are identical to the stock shocks in size, and there's a part that's inset to allow for more clearance. It was worth 3/4 of an inch or so for us.

      Just something to look into. If you still have the stock struts around, throw one in and see how much more clearance there is, that's how much you'd gain by going to konis/GC.

      Perhaps a bigger benefit than bump steer is the narrower track and reduced steering input effort.

    15. Banned madmax199's Avatar
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      06-12-2010 10:50 AM #15
      I did the six speed TT gear ratio to mph calculations for the 3 most likely ran R-compound sizes on the car. Since that kind of info was not available anywhere when I was looking for it, i'll post it for future references.

      The TT has a final drive of 3.32:1 and second gear ratio is at 2.11:1 so on top of second gear:

      25.4"▼▼ (275/17 or 315/17) ----- 24.8"▼▼(285/18)
      RPM ------------(MPH) ----------- RPM----------- (MPH)
      8000 rpm 86.30 mph -------- 8000 rpm 84.26 mph
      7500 rpm 80.90 mph -------- 7500 rpm 78.99 mph
      7000 rpm 75.51 mph -------- 7000 rpm 73.73 mph
      6500 rpm 70.12 mph -------- 6500 rpm 68.46 mph
      6000 rpm 64.72 mph ------ 6000 rpm 63.19 mph
      5500 rpm 59.33 mph ------- 5500 rpm 57.93 mph
      5000 rpm 53.93 mph ------- 5000 rpm 52.66 mph
      4500 rpm 48.54 mph ------- 4500 rpm 47.39 mph
      4000 rpm 43.15 mph ------- 4000 rpm 42.13 mph
      3500 rpm 37.75 mph ------- 3500 rpm 36.86 mph
      3000 rpm 32.36 mph ------- 3000 rpm 31.60 mph
      2500 rpm 26.97 mph ------- 2500 rpm 26.33 mph
      2000 rpm 21.57 mph ------- 2000 rpm 21.06 mph

      Keep in mind that the TT redlines at 6600 rpm in stock form and the motor runs out of breath past
      5900 rpm.
      Last edited by madmax199; 06-12-2010 at 05:51 PM.

    16. Banned madmax199's Avatar
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      06-16-2010 12:17 PM #16
      I did my 3rd event with the car last weekend and was pretty happy with the outcome, we gave a nationally prepped GT3 with good drivers and fresh A6 a run for their money while still on very old v710.
      They beat us, don't get me wrong and got FTD but in their own words "that little TT really husled"

      You could tell that the GT3 was pulling much harder in the few power section of the course but was not outhandling us, so I need to loose some weight and get more power.



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    17. Member aircooled56's Avatar
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      06-17-2010 09:46 PM #17
      Nice setup.

      I wish I read this thread before I went through all the trouble to figure out wheel rates on my RSS's on my R32

      I don't know about you, but I personally think that our chassis could benefit from a tad more rear rate (assuming you are leaving your front bar connected).
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      06-18-2010 08:15 AM #18
      Sweet car." Now just need to loose some weight and add power."

      The TT may benefit from using my dynamic rear steer. (DRS).
      Picks up a tenth or two any twist beam VW .
      The http://www.fwdracingguide.com/ Money back guarantee!, You can go 100$ faster with this 20$ guide
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    19. Banned madmax199's Avatar
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      06-18-2010 09:47 PM #19
      Quote Originally Posted by aircooled56 View Post
      Nice setup.

      I wish I read this thread before I went through all the trouble to figure out wheel rates on my RSS's on my R32

      I don't know about you, but I personally think that our chassis could benefit from a tad more rear rate (assuming you are leaving your front bar connected).
      You are right that the chassis would've benefited from a little more rear rate but a rear swaybar even stock would be too much IMO and make the car tripod(you don't want that with awd).

      The other option would be to add more rear spring but the rear natural frequency right now is almost at 3hz and raising it would make bumpy turns problematic, so I made the decision to leave it as is for now. I tried the no front bar approach but transitions suffered a little so I modified the stock front bar to cut the rate significantly and I'm happy with the balance.

      I am currently at the dc prosolo and the chassis will have a real test tomorrow and I will report my findings!

    20. 06-18-2010 09:51 PM #20
      Quote Originally Posted by madmax199 View Post
      You are right that the chassis would've benefited from a little more rear rate but a rear swaybar even stock would be too much IMO and make the car tripod(you don't want that with awd).

      The other option would be to add more rear spring but the rear natural frequency right now is almost at 3hz and raising it would make bumpy turns problematic, so I made the decision to leave it as is for now. I tried the no front bar approach but transitions suffered a little so I modified the stock front bar to cut the rate significantly and I'm happy with the balance.

      I am currently at the dc prosolo and the chassis will have a real test tomorrow and I will report my findings!
      Good luck tomorrow and Sunday. CSP is a real challenge, though you should have a real advantage at the lights.

      Come talk to Chris and I at the NNJR events, I think a lot of what we did on my MKIV for DSP would help you.

    21. Banned madmax199's Avatar
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      06-18-2010 10:43 PM #21
      Quote Originally Posted by DIAF View Post
      Good luck tomorrow and Sunday. CSP is a real challenge, though you should have a real advantage at the lights.

      Come talk to Chris and I at the NNJR events, I think a lot of what we did on my MKIV for DSP would help you.
      Thank-you, I Will let you guys know how it went and I'll see you guys at the next nnjr event!

    22. Member flyinglizard's Avatar
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      06-20-2010 01:02 PM #22
      I wasnt kidding about the rear steer.
      You will pick up a cleaner turn in using the DRS. It is legal in SCCA and a definite improvement over the firm rear axle placement. I have about 20 cars using it now and none will go back to the old way. Email me and Igive you some details.
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    23. Banned madmax199's Avatar
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      06-20-2010 09:21 PM #23
      Quote Originally Posted by flyinglizard View Post
      Sweet car." Now just need to loose some weight and add power."

      The TT may benefit from using my dynamic rear steer. (DRS).
      Picks up a tenth or two any twist beam VW .
      Anything that can make the car faster legally is going to have my interest but I'm not sure how the system works and if it applies to the TT's suspension design. Can you give us more details, and you also mentioned something about twist beams can you clarify?

    24. Banned madmax199's Avatar
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      06-20-2010 10:18 PM #24
      After a long and hot weekend we put the car in the trophies in CSP at the DC prosolo and that makes me happy although it's my co-driver's accomplishment.

      I sucked at life this weekend and coned or redlighted all my potentially good runs.

      We had some issues with the driver's side front tire rubbing where the fender attaches to the bumper but took care of it while staging with a breaker bar. Our 710n diverter valve also failed and is honking like crazy now, it made the car sluggish all weekend but we had no choice but to continue with it since the closest dealer with one in stock was a little out of the way.

      The car performed surprisingly well against the stiff competition of the miatas and was also the the fastest non miata(an Mr2 and an Rx7) of a healthy class of 12.
      We were pulling high ones in the sixty foot, while the rest of the class was averaging mid twos(as a reference, SM evos with two steps launch control were doing mid ones at the sixty foot mark)

      Overall I am satisfied with the result for a car with only 4 events under it's belt and limited prep. I will post some pictures and videos later because I am shot after the 6 hour drive and lots of traffic.
      Last edited by madmax199; 02-18-2011 at 01:12 PM.

    25. Banned madmax199's Avatar
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      06-23-2010 01:19 AM #25
      Here are a couple of pictures of the car at the pro in DC, I edited them to remove most of the shadows for photo analysis.
      The pictures reveals a few things:
      1)The car is not too stiff and still has some healthy roll, so the suspension is working
      2)The high static camber is justified as you can see that when fully loaded the camber goes a hair positive
      3)The car does not tripod and that makes me happy because I worked really hard to make that happen(according to my suspension simulation I would pick up a front wheel first with the setup)
      4) I need to up my tire pressure all around by a few pound(I was running 23/20 front to rear and it looks like it is too low)

      Maybe there are things that I'm missing so I'm open for inputs!





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      Last edited by madmax199; 06-26-2010 at 08:26 AM.

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