Hi everybody!

New person here so try not to feel the need to go overkill on me!

Right..Ive ben looking thru here for a few days now. Mainly at different gear sets on offer and FD on offer from companies.

Ive also got over 5 pages of spreadsheets and calculations but they are only theory and now I finally need some practical answers. Like I said, ive read thru here a lot and done a whle load of searching about the topic but often find a lot of opinion and I really would like to here some straight facts! (hope that dont sound rude!)

Now ive seen what OS giken, quaife and kaaz offer and TBH, the OS 5th is too long for my liking and would stunt 5th gear performance although. The quaife first is similar....far too tall a gear to warant driving everyday!

Now Ive got a lot of calculations for the ATS FD and 3-4-5 set. Im not too bothered about the 1st gear cos I reckon 3.23 is adequate.

from my calculations:

JDM ITR 4.785 w 205/50/16 tyre w/ ATS 3-4-5: Top speed=117mph
5ht gear/70mph =5000rpm

ATS 4.929 w 205/50/16 w/ ATS 3-4-5; Top Speed=114mph
5th gear/70mph =5100rpm

Now can anyone tell me from experience what the actual tope speeds in 5th gear are for the 2 setupd I mentioned.....either with 15in or 16in rims...and also what tyre size was used

Also, I plan to buold my engine and up the limiter. Has anyone done such a thing with their setup so that they have either of the gearing setups and an upped limiter....what is your top speed now with the raised limiter?

And also, can anyone quantify the difference in acceleration that wither of those setups will make.

Oh and before anyone jumps in with the gas mileage remarks....it doesnt bother me

If anyone would be so kind as to help

And ive searched already!

 

I don't know of anyone that has the ATS 3,4 & 5 but I would be quite interested in hearing from someone that does. Perhaps, get in touch w/ Yasu from ATS, he may be running those gears in his EG or DC.

 

With the ats 3,4,5 gear set and either of the FD's, you'll have to shift so soon in every gear...that may prevent you from fully utilizing your power band...also, with stock first gear, your traction would be a problem unless you got some really nice tires.

 

The thing I saw from my graphs is that if you shift at redline (8300rpm), then with either FD, the revs will come back slap bang in the middle of the power band....whcich I would call a good thing.....itll be great for strong acceleration.

However....over say a quarter mile (I dont do drag racing and never intend to...Im using that distance as a performance marker), I dont think the car will limit out on either FD (4.785 or 4.929), but would the extra gearchange reqd over a quarter mile difference void any gains made by shortening the gearing?

I really need to know from someone with expericen on one of these setups...at what speed will my car limit out and how much more aggressive is the acceleration?

IF I was to drag against a standard Evo8, how far behind (or infront ) would I be? Assuming I have a JDM b18c1 engine (180PS...dual runer IM)

Sorry for the question overload...Im just trying to quanitfy the increase in acceleartion against other cars

 

I have the ATS 3-4-5 gears with 4.4FD. I am running a b18c-r motor with 9100rpm redline. Tire size is 195-55-15.

I strongly recommend you do NOT use the ATS 3-4-5 gears with the 4.785FD. With that combo, you will simply run out of revs. Especially with a 8300rpm redline. With the ATS gears and the 4.785FD, your cruising rpm will be very high. at highway cruising speeds you may possibly be in VTEC.

With my setup, my top speed is in excess of 230kph (143mph) indicated on the speedo. I have never hit my top speed, but on the track have seen the speedo pass 230kph with still a few hundred rpm left before my redline.

With the 4.785 or 4.929 FD's, you will run out of top speed too quickly... it will be a huge hindrance especially on the main straight of any track. You will run out of gearing and top speed very quickly. Basically because of your gearing, the last 10kph before your max speed will take forever to reach.

Most guys in Japan who run gear sets will switch to a 4.4 or even 4.2FD. Almost no one runs 4.785 or higher.

Gas mileage results will vary. Depending on what kind of driving you do. Ultimately, you control what rpm's and speeds your car travels at. For city driving, my mileage improves; because of the gearing, I have more usable power at lower rpm's so I shift earlier. For city driving, I usually shift gears at between 1500-2000rpm and am in 5th gear before 40kph.

Basically, a close ratio gear set such as ATS improves/increases the usable power in each gear. Acceleration is noticeably stronger compared to stock gear ratios. Also, you do not lose as much rpm during a gear shift, so after each shift, you land at a better portion of the powerband. Furthermore, the top speed in each gear is higher than the equivalent stock gear, which is a benefit on the track as you do not run out of rpm's on some corners.

Traction is not an issue when you are talking about the 3-4-5 gears. And if you did get the ATS 1st gear, traction would be improved as the ratio is 3.077.

 

thats some good info.. but 5th before reaching 40 kph.. damn.

 

Thanks Spikey, thats very informative. Maybe a 4.785 FD with 3-4-5 isnt the way forward.

Looking back thru my options, that leaves me with 3 oher options:

1. 96 Spec JDM ITR Tranny w/ ATS 3-4-5 (or USDM Tranny)

2. My current tranny (JDm B18c1) w/ ATS 3-4-5

3. 98 Spec ITR Tranny w/ ATS 4.929

Now option 2 I dont like cos 3rd gear only has 10mph during hard acceleration

Which of the other 2 is the more aggressive acceleration? I dont know about the ATS 4.929/98 Spe ctranny cos Im already having wet traction issues and that would just put 1 and 2 up more?

And also, would it be possible to put an ITR 2nd gear into my current tranny (JDM B18c1) as this would save me the cost and hassle of finding a 96 JDM ITR tranny?

Spikey...did you ever use your ATS 3-4-5 on stock rev limiter? What was the top speed if you did? Or anyone else...?

Basically, I want very aggressive acceleration but Id like to be able to see 125mph




Modified by Navigator2012 at 1:01 AM 9/20/2004

 

I've seen ppl in Japan with close gearset AND short final drive, it's not uncommon. I think it's fine for them because they don't see as much highway action than we do here.

Like Spikey has mentioned, you are probably better off doing one OR the other. If you are on a budget, I would totally go with a shorter 1st gear and a short final drive (4.785 or 4.929 or even 5.000). I know several ppl who have done that and they absolutely love it. Talk to RagingAngel, he has one of these setups.

Another friend of mine has the 5.000 final with 96spec gears and I think it's also very effective. Same goes with the 4.929. And keep in mind, even with the shortest final drive (say 5.000) you will still have a higher top speed than having an ATS 5th with stock 4.4 final.

If money is not a very big factor, definitely consider a full gearset.

Did you mean ATS 4.929 for your 3rd option? I personally would do the 1st option...along with the ATS 1st gear.

 

Who sells a 5.000 FD??? Ive never heard of that? I knew Cusco did one...but thats discontinued now?

And wrt to my 3rd option./...my mistake! corrected now

I spose 125 ish would be handy....I just cant decide which would be more aggresive? ATS 4.929 or ATS 3-4-5 and 4.4FD??!!!

Argghh!! I hate these dilemma cos sods law says that the one I dont get wil be the one that will be most effective!

 

somebody call me name?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Saga &raquo;</TD></TR><TR><TD CLASS="quote"> Talk to RagingAngel, he has one of these setups.

</TD></TR></TABLE>

Saga is right..... we've had a lot of discussion over the wide range of available gears for different applications and I still believe I have the best gear set

ATS 1st gear with 2-3-4-5 '96 spec but I "shorten" everything with a 4.785 final.

I say it is best solely based on the money spent with the returns given as well.

I run the 1-2 '96 spec ratios on a B16A, motor is completely stock, but with the ATS 3-4-5.

Just consider what you have for a motor and what your demands are. I am confident I'd be able to hold my own on the track with just the 4.785. If you are using the stock limiter and find yourself lusting after top speed....stay with just the JDM final drive.

If you are building a more track oriented monster.....ATS 3-4-5. This is NOT to say neither is not capable for both daily/track duty. It really just comes down to YOUR preference and setup.

 

I know how you feel. Been there, done that.

ATS 3-4-5 with 4.4FD will be more aggressive. It certainly gives you a lower top speed. Search on google for "Gear Speed Calculator" and plug in all the gear ratios in there and compare the graphs....then decide from there.

I am not sure if Cusco still sells the 5.0.