Bolt-on M6 guys. Got a question.
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From: Silver Spring, Md.
Bolt-on M6 guys. Got a question. Alot of you guys have responded to my other thread in this section but not everyone believes my times were possible with me short shifting. My questions is, at what rpm do you guys shift your bolt-on cars?
I'll go first. I was always told that shifting at 6200 was the way to get the quickest et's with these cars. My previous best was a 12.40@112.8 on dragradials using that method.
My new best...12.27@113.4 on street tires, shifting at 5500 (possibly 5700 with these inaccurate tachs).
Has anyone truly experimented with lower shiftpoints?
I'm sure the 4.10s have a lot to do me getting away with the lower shiftpoints. I really don't think it would work with a car with 3.42s but may be possible with 3.73s.
I'll go first. I was always told that shifting at 6200 was the way to get the quickest et's with these cars. My previous best was a 12.40@112.8 on dragradials using that method.
My new best...12.27@113.4 on street tires, shifting at 5500 (possibly 5700 with these inaccurate tachs).
Has anyone truly experimented with lower shiftpoints?
I'm sure the 4.10s have a lot to do me getting away with the lower shiftpoints. I really don't think it would work with a car with 3.42s but may be possible with 3.73s.
Last edited by big dave; Mar 2, 2008 at 05:41 AM.
I argued with you a bit about it but I really don't know. The thing is when I **** at 6,200 I run out of 4th gear 15 feet before the traps. Had I short shifted it like you I would have finished the race with maybe a better e/t or trap speed since it didn't slow down of rev limiting. It's kind of in the air for me. I'm going tomorrow evening and launching all out and going for low 12's with a limiter set @ 6,500 still on the stock tune though. I'll let you know. Also what size tire are you running? I'm running 275/40/17 e/t streets...
Thread Starter
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From: Silver Spring, Md.
I argued with you a bit about it but I really don't know. The thing is when I **** at 6,200 I run out of 4th gear 15 feet before the traps. Had I short shifted it like you I would have finished the race with maybe a better e/t or trap speed since it didn't slow down of rev limiting. It's kind of in the air for me. I'm going tomorrow evening and launching all out and going for low 12's with a limiter set @ 6,500 still on the stock tune though. I'll let you know. Also what size tire are you running? I'm running 275/40/17 e/t streets...
Last edited by big dave; Feb 29, 2008 at 04:19 AM.
i agree i with the short shifting. back in my old bolton days i was running 12.6s and they guy i worked with (who has a 7sec car) told me to try adj my shift points i told him my peak on the dyno and that i tried to shift about 200 or so after that. he said try lower as it may put me closer to the MEAT of the torque curve. i did (about 5800 ish) anb i dropped to a best of 12.42 and i was on my way to a 12.3 but i let off as i was bracket racing.
so in short i suggest tryin all diff shift points to find you best.
so in short i suggest tryin all diff shift points to find you best.
Big Dave, your car has pretty much the same mods as me so I'm hoping for a good time like your's this Sunday at MIR. Are you running this weekend? BTW, I have my shift light set at 5800 so I'm sure that I'm in the low 6000's when I react and shift with my 4.10's.
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Last edited by big dave; Feb 29, 2008 at 04:22 AM.
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Brett Foote Thread Starter
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From: Silver Spring, Md.
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From: Silver Spring, Md.
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From: Grafton Ohio
Yes I have tried different RPM's and have found that 5500 work's the best. I was surprised to see how much my car would fall off by just raising the RPM's by a couple hundered. Every car is just a little different so every car will like a different RPM.
Yea my cars best is when I shift at 5700rpm and I was shifting at 6200rpm for the longest. Im like the other guy why would you shift that high if it does not make the power after 5500-5600rpm. I don't speed shift either that is why I shift at 5700rpm so the rpm want drop to much during the next shift. Hopefully when I get to be a full bolton car I can get those times you got thoa.
Dave I think it is true that you ran that time because if the track is preped very well you can dead hook a street tire. Back in 06 I ran my factory street tire and they prepped it very well because they had some big hp drag cars there all week long. I pulled up from the staging lane and tried doing a little dry hop since I was on just a street tire and they dead hooked! My first reaction was to check the TCS and it was off. So I reved it up to 5k and dropped the clutch and got just a few tire revelutions and pulled up to the line. I used to launch at 2800 rpm on the street tire but since I new it was real sticky that nite I took her up to 3500rpm! And then the light turned green and it dead hooked to my surprise. I think my 60ft was some where around the line of 2.0X when I usally ran 2.2X all day long.
Thread Starter
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From: Silver Spring, Md.
Yea my cars best is when I shift at 5700rpm and I was shifting at 6200rpm for the longest. Im like the other guy why would you shift that high if it does not make the power after 5500-5600rpm. I don't speed shift either that is why I shift at 5700rpm so the rpm want drop to much during the next shift. Hopefully when I get to be a full bolton car I can get those times you got thoa.
Dave I think it is true that you ran that time because if the track is preped very well you can dead hook a street tire. Back in 06 I ran my factory street tire and they prepped it very well because they had some big hp drag cars there all week long. I pulled up from the staging lane and tried doing a little dry hop since I was on just a street tire and they dead hooked! My first reaction was to check the TCS and it was off. So I reved it up to 5k and dropped the clutch and got just a few tire revelutions and pulled up to the line. I used to launch at 2800 rpm on the street tire but since I new it was real sticky that nite I took her up to 3500rpm! And then the light turned green and it dead hooked to my surprise. I think my 60ft was some where around the line of 2.0X when I usally ran 2.2X all day long.
here is a link with the stock dyno curve and look at the power dip when it is past 5500 i think you might be on to something. They also talk about how it does not make any more power past 5500 a few paragraphs into the article.
http://www.compcams.com/Community/Ar...ID=-1044516358
http://www.compcams.com/Community/Ar...ID=-1044516358
Thread Starter
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Joined: Feb 2002
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From: Silver Spring, Md.
here is a link with the stock dyno curve and look at the power dip when it is past 5500 i think you might be on to something. They also talk about how it does not make any more power past 5500 a few paragraphs into the article.
http://www.compcams.com/Community/Ar...ID=-1044516358
http://www.compcams.com/Community/Ar...ID=-1044516358