Running higher rev limits reliably

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Mar 3, 2007 | 03:08 AM

#16

ghoonk

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From: Dubai, UAE

Quote:

Originally Posted by Ted B

So what turbo will you be using to justify this lofty rev limit?

Hi Ted. I will be running the stock turbo (9.8T) as i am getting very good spool and power from it on the A1 track in Dubai.

Mar 3, 2007 | 03:13 AM

#17

ghoonk

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From: Dubai, UAE

okay, now that I have had a chance to go through the replies, it appears that it doesn't make sense to be able to rev that high (yes, I used to own an S2000) without a bigger turbo and some serious machine work.

As mentioned, being able to rev that just allows me to hang in 3rd and 4th longer and doesn't require me to shift mid-bend, where I run out of 3rd or 4th. I'm not getting it to get the 9000 rpm kick that I got out of the F20C engine.

As such, I'll be saving up for a 20G LT or FP Green and some decent coilovers, seats and a proper harness.

Mar 3, 2007 | 07:10 AM

#18

Soon2BEVO

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Yeah even with the FP Green, 8500 seems well out of range. Going that high is for GT35Rs with some serious cams. When I went to the track and shifted at 7500rpm, I went consistenly slower than when I shifted at 7300. Stock turbo of course.

Mar 4, 2007 | 06:15 AM

#19

PeteyTurbo

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Quote:

Originally Posted by Ted B

No, it means the rate of acceleration is on the decline.

Regardless of whether one has a 5 or 6 spd, a shift point calculator reveals that point whereby spinning it faster means going slower - for each gear change. If one has a copy of his dyno sheet and knows his gear ratios, it takes about 10 minutes to get the facts.

Ted, this is all well and true, but when you have to shift into 5th shortly before the finish line it pretty much throws that right out the window..It could be the difference of making 280hp for .2sec compared to making nothing at all for the same amount of time, and then going to 320hp for another .2..There Will become a point where it would be a good idea to shift but I am certainly not there yet and I am not sure I will be there with cams either but we will see..

Mar 4, 2007 | 09:07 AM

#20

Ted B

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Obviously, if more time is lost to making the shift than gained from making the shift, that has to be considered. Just shift it faster.

Mar 4, 2007 | 09:12 AM

#21

A418t81

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8500 is for 35R or bigger and with a head that can actually flow well that high as well which means big cams, port work, etc.

Mar 4, 2007 | 11:23 AM

#22

PeteyTurbo

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From: Philadelphia

Also, if you are running a 35R you will most likely have to shift anyway because of the added power you will be shifting gears at a closer distance from the start line..