Blasphemy101's 2013-2014 AutocrossThread

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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby Yoshi » Thu Apr 17, 2014 10:58 am

M20 power tapers off past 5 though. I'd shift before 6, assuming it'd keep you above 4 when you're done shifting.

Been a while since I drove an M20 though.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby M20_fever » Thu Apr 17, 2014 12:55 pm

Every b25 I've driven redlined at 6800 with stock chip. The eBay chip I have bumps that up to 7k, but with MS I'll be setting it to 7200. The stock 'i' cam stops making power around 6200, but its still faster to stretch the gear to resline than to shift unless you can hold the next gear for at least a few seconds. In a slalom situation you would be better off with the extra top end rpm than shifting up, then shifting back down at the end.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby blasphemy101 » Fri Apr 18, 2014 5:05 pm

Now I'm confused. It's been so long since I used the stock DME, I couldn't remember what the stock rev limit was... I thought it was 6300... :oops:

Nsquared97 wrote:That's pretty awesome to be in the top 4 at a Corvette club event, nice work!


Yeah - everyone faster than me was on slicks and I believe over 400whp, so I'm happy with 4th :)

Yoshi wrote:M20 power tapers off past 5 though. I'd shift before 6, assuming it'd keep you above 4 when you're done shifting.

Been a while since I drove an M20 though.


With my current lag situation (hopefully to be tackled this weekend), that would never work lol I

I do catch myself short-shifting pretty often on straights, though.

M20_fever wrote:Every b25 I've driven redlined at 6800 with stock chip. The eBay chip I have bumps that up to 7k, but with MS I'll be setting it to 7200. The stock 'i' cam stops making power around 6200, but its still faster to stretch the gear to resline than to shift unless you can hold the next gear for at least a few seconds. In a slalom situation you would be better off with the extra top end rpm than shifting up, then shifting back down at the end.


In this case, I was shifting to 3rd and leaving it there until the ~180 deg. hairpin, but I see what you're saying. Typically the less shifting the better...

Once I get all the peripheral items (turbo, cooling, steering rack) sorted, I'd like to refresh the head. With a reground cam and some smoothed HD rockers, I want to run up to 7k. Think that would do the trick?
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby M20_fever » Fri Apr 18, 2014 5:40 pm

7k is what I run it at now with no problems at all. Even with a more aggressive cam 7k is fine as long as you upgrade rockers and springs with it.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby blasphemy101 » Thu Sep 25, 2014 4:14 pm

Well, no news on the cam front, but after my swap to a smaller turbo, the car feels much more peppy. It's no improvement from a peak-horsepower perspective (it's looking like I actually lost power), but the car is much more fun to drive on course, because I'm never waiting for the turbo to kick in. I was running with my boost controller open, so I was making a little under 9 PSI ( 220-240whp). I imagine the car will become a handful in some corners if I decide to bump the boost up.

I did not run into the same understeer issues I had at the last event. A friend of mine had the same problem (understeer) at the last event, but his car was sliding all over the place this time around. Neither of us had changed anything since the previous event, so we're thinking it may have had something to do with the driving surface. My personal theory is that my large amount of turbo lag was causing me to push too deep into corners while trying to get/keep in boost.

I managed to come in 4th out of ~40 drivers behind a C6 corvette, two mustangs on slicks, and an S2000 driven by one of the competitors from the GT Academy TV show (c'mon - I have to make some kind of excuse). Videos to come...
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby Yoshi » Fri Sep 26, 2014 11:23 am

Too lazy to look through posts. Got an EBC?
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby blasphemy101 » Fri Sep 26, 2014 1:45 pm

Nope - just a very simple MBC. I'm pretty satisfied with power delivery for now, but it's in the plans for "Stage 2".

Once I have the rest of the car solid and where I want it, I want to get creative with engine management stuff.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby Yoshi » Fri Sep 26, 2014 4:47 pm

Remember that regular wastegates "creep" open. An EBC will keep the WG closed until it reaches boost then sends the full open signal to the WG. This should greatly help spool.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby blasphemy101 » Fri Sep 26, 2014 5:06 pm

Yoshi wrote:Remember that regular wastegates "creep" open. An EBC will keep the WG closed until it reaches boost then sends the full open signal to the WG. This should greatly help spool.


Yeah - I think we talked about this issue before when I had my Holset turbo. I'm okay with the spool-up characteristics right now. At 3500+ RPM, I'm in boost and scooting right along, and since I have a 3.73 final drive, I'm ALWAYS over 3500 RPM.

Even cruising on the highway, I can tell the turbo is spooling pretty well. As soon as I add any throttle, it builds boost. It's a pretty cool sensation, but cruising at 100 kpa means rich AFR. Now that I think of it, a EBC could probably fix that...
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby Yoshi » Fri Sep 26, 2014 5:13 pm

Boost problems.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby blasphemy101 » Mon Jan 12, 2015 2:42 pm

Small update closing up 2014 -

I drove in a "Porsche vs. BMW" autocross event in November, putting down the fastest street tire times and fastest raw (not counting a cone) time of the day. I fell behind a E90 M3 and Porsche Boxter S (both on R-Compounds) by a few tenths of a second. In the process, I corded a tire, raising a dilemma: to buy more street tires or move up with the big guys and run r-compounds.

R-compounds obviously have more grip, but they wear much faster. In the end, I made the only logical choice...

I got a new set of wheels with used Hoosier R6s! R6 is the old Hoosier track compound, which doesn't have as much grip at lower temperatures as their autocross-only compound, but I think they should last me a little longer. I wasn't sure how much better the Hoosiers would perform compared to top-tier street tires, but they didn't disappoint.

In December, I placed first at a Corvette-club autocross by a comfortable margin (a couple thousandths), and this past weekend, I placed second 1.5 seconds behind my friend who is a robot driver in an awesomely set up C5 Z06. These positions are up from my ~5 place finishes on street tires.

These tires seem to work really well, but they are very sensitive. Alignment and temperature have a huge impact on their performance; the December event was fairly hot, so I was surprised by my lack of grip in the morning (~60 deg.) this past Saturday. Sliding and wheelspin also massively increase wear, after a spin on cold tires and a couple other big slides on the same corner, my outside rear tire is showing way more wear than the others, and I hope it is able to last me another event.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby Yoshi » Mon Jan 12, 2015 5:31 pm

How long are these lap times? a few thousandths of a second are huge in a sub 1 min lap time. But in a >1 min lap, not much.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby blasphemy101 » Tue Jan 13, 2015 3:28 am

~50 seconds so my first place finish wasn't by much, but the top 3 times we're within a few hundredths.

As the course gets shorter the gaps obviously get smaller, but I think you can only consider that up to a point. When you get into the hundredths or thousandths of a second, you're talking about a slightly faster clutch engagement on shifts or a little less wheelspin off the line - things that typically don't matter at local-level autocrosses.

Basically, the three of us tied in my book, but it was nice to see my name at the top.

There was ~1.5 seconds between my buddy and I this past weekend, which is obviously huge, but that's what happens when you put a monster driver in a monster car.
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby Ryki » Wed Jan 14, 2015 3:48 am

So nice to hear about you racing against Corvette's and winning, or tying, with em! Keep up the posting and keep up with the video posts, it's like crack and we always gotta have more of it!
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Re: Blasphemy101's 2013-2014 AutocrossThread

Postby M20_fever » Wed Jan 14, 2015 7:18 pm

I really want to move into an R comp class. How much did the R6 cost you? Do your laps even last long enough to get them heated up? I was going to run their autox compound for my track stuff since we only do one lap with a cold start.
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