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Old 11-13-2005, 07:42 PM   #1
Nixlimited
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Default First AutoX in my STi

Well, the reason I bought my STi was so that I could have a more suited autox car. I just finished a 2 day autox and all I have to say is that I am very impressed. The STi is a fantastic car of the lot and I now know which direction I want to go in to modify it for better handling: first step, JDM pinks and Cusco sways. That's what one of the local guys was running when he won last year's regionals. The body roll is pretty intense and I need some more camber in front for sure. I think after two days my RE070s are about toast so I am going to start deciding which R-comps to run (since I am already in SM).

Another interesting thing ... I think all of my thought process about really small turbos that spool well for autox is somewhat off. When driving autoxs, I am almost always at the top of the rev range for the car. I recorded some runs on my defis and noticed that I never hit full boost and that's mostly because when I shift I am already way past where the small VF39 hits full boost (~3000 rpms on my car). I think I have finally made up my mind for the SZ49 over the 20G.

All in all, a great weekend
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Old 11-13-2005, 08:13 PM   #2
theicewall
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Here is the thing. You are always on the top of your rev range in autoX, but, you are also on and off throttle with many stabs in between to get the car to act properly. If you go with a very large turbo you will not deal with the lag you get while the car is still pulling through vacuum and the lower rpm band due to the nature of your gear ratio, but you will get lag while the turbo spools at higher rpms in on/off throttle situations. Ideally you should build the car to have a solid midrange and responsiveness as well as a strong top end. You may need something larger than the VF39, but the sz and 20g might be too big.
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Old 11-13-2005, 08:18 PM   #3
nimblegimbal
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yup, look at it this way, a laggy setup is still gonna lag to some degree on a dyno no matter where you start the pull, gotta find that happy medium
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Old 11-13-2005, 09:14 PM   #4
vintagemilano
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I may be wrong..... but I thought SM (street modified) was a street tire class, no R compounds....
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Old 11-13-2005, 09:16 PM   #5
Nixlimited
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Default

Quote:
Originally Posted by theicewall
Here is the thing. You are always on the top of your rev range in autoX, but, you are also on and off throttle with many stabs in between to get the car to act properly. If you go with a very large turbo you will not deal with the lag you get while the car is still pulling through vacuum and the lower rpm band due to the nature of your gear ratio, but you will get lag while the turbo spools at higher rpms in on/off throttle situations. Ideally you should build the car to have a solid midrange and responsiveness as well as a strong top end. You may need something larger than the VF39, but the sz and 20g might be too big.
A 20g is barely bigger than the VF39 and it spools the same. The SZ49 is a medium sized turbo that spools about 300-500 rpms later.

Quote:
Originally Posted by vintagemilano
I may be wrong..... but I thought SM (street modified) was a street tire class, no R compounds....
You are wrong, I was beaten by a civic running r-comps in SM today
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Old 11-13-2005, 09:36 PM   #6
WRXedUSA
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What did you drive before in autoX?


I would pass on a bigger turbo. The torque and gears help the Sti a bunch. Build your car to the class you are comfortable in. SM/STU is an expensive endeavour for an STi.
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Old 11-13-2005, 10:13 PM   #7
KC
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Quote:
Originally Posted by vintagemilano
I may be wrong..... but I thought SM (street modified) was a street tire class, no R compounds....
SM must run on DOT rated tires. So, yes.. R-compounds 'technically' are street tires.

--kC
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Old 11-13-2005, 10:29 PM   #8
Nixlimited
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Quote:
Originally Posted by WRXedUSA
What did you drive before in autoX?


I would pass on a bigger turbo. The torque and gears help the Sti a bunch. Build your car to the class you are comfortable in. SM/STU is an expensive endeavour for an STi.
I still autox my other car, it is an E46 M3.

I am already past STU because I have EM (Cobb Pro-tune). I have thought about tuning a stock boost map, but it may raise some eyebrows still. Bottom line, I like to heavily modify my cars so whether or not I will have the best car for SM or not, that's likely where I will end up. It's all about having fun and learning to drive the car better. Hell, I came in 2nd today.
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