Dyno Differences between 3rd and 4th gear?? - SR20 Forum
 
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#1 (permalink) Old 05-29-2003, 01:48 AM
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Dyno Differences between 3rd and 4th gear??

Hey guys, theres a thread about this over at the pulsar board and they are saying that there is a big difference between 3rd and 4th gear dyno pulls. When I dynoed it was only a difference of 2hp, but I'm NA. I was wondering if you guys (both NA and turbo) could post the difference between your 3rd and 4th gear dyno pulls. Thanks a lot.
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#2 (permalink) Old 05-29-2003, 03:36 AM
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I also noticed a difference of ~2whp between a 3rd gear pull and a 4th gear pull on my DET.

Antonio G.
BLACK 91 SE-R w/ DET, 7psi - 13.9@101.9 on streets, 206whp/196wtq
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#3 (permalink) Old 05-29-2003, 09:43 AM
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4th gear is safer, especially for the high hp turbo guys

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#4 (permalink) Old 05-29-2003, 09:48 AM
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I don't know what a DET is but if it get me through the 1/4 at 13.9 I want one

'91 SE-R, Original owner, PowerSlots, Axxis MM, Magnacore, Michelins, NGK's , Stromung cat-back and 90K orig miles. Spring '06 work: GR2's and boots with orig. springs, ball joints, TR ends - inner and outer, ES front CA bushings, CV joint rebuild.
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#5 (permalink) Old 05-29-2003, 09:48 AM
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I have always wondered about this. In which gear are your numbers more accurate 3rd or 4th?
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#6 (permalink) Old 05-29-2003, 09:54 AM
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Big turbo cars usually get more accurate results from a 4th gear pull and even then it doesn't load them down like the street.

The dyno showed my turbo coming on strong around 4700rpm in 4th...on the street it was much lower like 4200rpm. In third it wouldn't do anything until about 5300rpm on the dyno.

As for actual hp numbers...it's splitting hairs on the dynojet as it can calculate either accurately. I can't speak for whatever brand dyno they use down under.

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#7 (permalink) Old 05-29-2003, 10:03 AM
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Quote:
Originally posted by SE-Rican
I have always wondered about this. In which gear are your numbers more accurate 3rd or 4th?
Everybody wonders about it!!!!

If you think about it though, there is no answer. What do you mean "more accurate"??? There is no such thing. A dyno at 3rd shows xxx.xx whp, another at 4th shows yyy.yy whp. You pick the best and you do your pulls in that speed from there on!!!

Seriously though, "street" wisdom (??) says that you do your pulls in the gear closer to 1:1. Almost all BMWs for example have their 5th at 1:1 so I suppose BMWs should dyno in 5th!.

In SR20s, 4th is closer to 1:1 but we give the N/A cars some leaway and allow them to dyno in 3rd since N/A SR20s give better results in 3rd.

Chris

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#8 (permalink) Old 05-29-2003, 10:15 AM
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My NA dyno results were basically the same in each gear. Some High HP cars can spin the tires a bit in 3rd so 4th is a better option.

Steve
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#9 (permalink) Old 05-29-2003, 11:12 PM
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Same here, they are saying there is a 20KW difference at the wheels which is like 27 horsepower which is rediculous. This is on two cars with the same mods dynoed on different days on the same dyno. The one in 3rd dynoed at 76KW at the wheels and the car in 4th at 94KW. I suspect there was something funky with the dyno for the 76KW pull. The cars also run the quarter mile withen .2 sec's of each other.

Quote:
Originally posted by 98sr20ve
My NA dyno results were basically the same in each gear. Some High HP cars can spin the tires a bit in 3rd so 4th is a better option.

Ryan
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#10 (permalink) Old 05-30-2003, 12:20 AM
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I've seen high HP Supra's dyno in 5th, so each car is different. I witnessed first hand a se-r smoking the tires in 3rd on a dyno. They ended up doing the pull in 4th.
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#11 (permalink) Old 05-30-2003, 06:18 AM
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where the rollers locked(dyno brakes) on the dyno?

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#12 (permalink) Old 05-30-2003, 08:43 AM
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You need to realize this. Strange things can happen on a Dyno. In my 50+ odd pulls with my car I have had numbers pop out that are just wrong. For instance I once got 205+whp (I really had 180whp). It was a weather station error and took 15 minutes to figure out. People have this stuff happen to them and post it as fact. Ignore half the crap you read on the internet. So much of it just is not accurate enough to really care about. If it doesn't sound right from the start then 99% of the time it is wrong.

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#13 (permalink) Old 06-01-2003, 03:25 AM
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Just my two cents.....

But I am positive that my 3rd gear tops out at 100 mph @7500 rpms....Never been at 4th gear redline, but I would guess it would in excess of 130 mph. Isn't that a bit fast on the dyno? From what I have seen, most dyno runs top out around 80-110 mph. That would mean 3rd gear for me.

BTW, I have the G20...definitely taller gearing than the classic SE-R's.

-Brian --2007 Corvette, 2007 G35 sedan; 1995 G20; Tacoma v6; 1969 Olds 4-4-2
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#14 (permalink) Old 06-03-2003, 10:36 AM
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Anyone else have any input on this?

Ryan
former pulsar car whore, missin the PGA (pulsar group of Australia) people
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#15 (permalink) Old 06-03-2003, 05:04 PM
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So then the really high hp cars that dyno in 4th or 5th gear are spinning the rollers at 150 + mph....that's cool

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