I'm just trying to figure out what the top speed would be with a ATS 4.9 Final drive on my R.I have 215/45/16 on it now and I shift usally at 9k rpm's.Does anyone run this setup?

 

I run 225/45/15 Hoosiers and cut out at ~142mph indicated. Not sure how close it is to the actual speed.

FYI, stock gearing w/ATS 4.929 final.

 

Doesn't matter where you normally shift, does matter where your car makes peak power (usually around 8 K rpm on a stockish ITR). The stock top speed is about 143-145 mph, with a 4.4 final drive.

New top speed with a 4.9 FD will be about 130 mph.
That being said, you'll most likely get to 130 faster though.

 

I think with my 215/45/16 the speedo is off like 3 mph.How many rpm's are you turning and 142 mph?I usally try to shift around 8K maybe a lil' higher depending if I'm racing or not.I go to around 9K when I'm stringing it out which is not really that often.Just trying to decide if I should go with the FD when I put a new clutch and flywheel in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zygspeed &raquo;</TD></TR><TR><TD CLASS="quote">New top speed with a 4.9 FD will be about 130 mph.
That being said, you'll most likely get to 130 faster though. </TD></TR></TABLE>

Holy crap, is that right, Ed? I didn't realize the speedo was that far off.

For the post above, I'm hitting the limiter at that point.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jason Franza &raquo;</TD></TR><TR><TD CLASS="quote">

I'm hitting the limiter at that point.</TD></TR></TABLE>

The stock limiter?8500?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jason Franza &raquo;</TD></TR><TR><TD CLASS="quote">Holy crap, is that right, Ed? I didn't realize the speedo was that far off.</TD></TR></TABLE>

May have to adjust somewhat for tire size, and I know you have more power than a "stock" ITR Jason.

But it still comes down to 4.4/4.929 x previous (stock) top speed, ...
= previous top speed x 0.893

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zygspeed &raquo;</TD></TR><TR><TD CLASS="quote">But it still comes down to 4.4/4.929 x previous (stock) top speed, ...
= previous top speed x 0.893</TD></TR></TABLE>

2 words Ed...

"Business Major"

Seriously, makes sense

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jason Franza &raquo;</TD></TR><TR><TD CLASS="quote">Seriously, makes sense </TD></TR></TABLE>

I'd watch out for the guy drafting you with a stock FD down a long straight/speedway once you top out and if there's still some room left before the next turn/chicane. hehe

 

Mine hit 145 on a Dyno

I think a friend captured it in this vid:

*Right click save as*
http://www.we-todd-did-racing....DE%3D

EDIT: video works now!


Modified by 92TypeR at 7:42 PM 1/26/2004


Modified by 92TypeR at 11:00 PM 1/27/2004

 

Ammm ... linkey no workey?

 

with stock rev limiter, ats 4.9 final, and a little extra power than stock; I was banging off the 8600 rev limiter in 5th gear on the hwy one time. ~145 indicated.

I calculated it one time with stock tires and it was like 138mph.

No reason to keep the stock 4.4 unless you're Ed/ zyg.....

And fwiw, you get there a LOT faster. I don't recommend testing it out though.

Jason's speed is off significantly b/c of the tire size.


-hth

 

The top speed of the stock ITR is higher than 145. Mine, stock, saw 155mph w/ 3 people in the car. I've got the video . I've got the ATS FD w/ stock gearing and with 205/50/15's it was showing ABOUT 135-137ish when I hit 8400rpms in 5th gear. I'm now running 215/45/16's but I haven't done a top speed run with this setup. If anyone wants to see the 155mph video, right click here and save (30mb). It requires DIVX codec. I was not driving, this was the previous owner. Please don't flame me. The blue car in the right lane when everyone goes OH **** is a cop. That explains the "running" in the end.

http://www.kosmodog.com/98itrd.avi

 

Here's a speedo shot from the video:

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Fat Bradstard &raquo;</TD></TR><TR><TD CLASS="quote">The top speed of the stock ITR is higher than 145.
</TD></TR></TABLE>
totally agree with you bro mine brother hit atleast 155 like you did and perhaps even 160 the needle was stuck and couldn't go anymore....with the ATS and 205/50/15 Azenis and two people in the car..and didn't take long either to get to that speed..that **** is scary driving that speed in that light *** car...this was accomplished on the NJ TWP at Exit 14 alongside Newark Airport..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Fat Bradstard &raquo;</TD></TR><TR><TD CLASS="quote">Here's a speedo shot from the video:

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

that's retarded unless you're on a dyno or track

 

Look guys, the speedo's a bit off at that speed.
Especially if you've got different size tires on.

Though, with three people in the car it might have been sitting a little lower and therefore you might have lessend the drag coefficient.

 

That was completely stock, stock tires, no mods to the motor, only about 3k miles on it.

 

With a 215/46/16 = 23.6" DIamater the top speed at 9000 rpms with a 4.9 FD is 152.1 mph

a 205/50/15 ATS FD at 9000 RPMs is 148

Stock Tire 195/55/15 ATS at 9000 RPM is 150.8 mph

Stock Fuel cut woudl make a 215/45/16 = 142

205/50/15 with stock fuel cut is 140 mph.

True top speed of a USDM R assuming we had enough power to over come drag is 159 mph

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Asahi &raquo;</TD></TR><TR><TD CLASS="quote">True top speed of a USDM R assuming we had enough power to over come drag is 159 mph</TD></TR></TABLE>

I expect that is if you make peak power @ 9K instead of the stock 8K?

However this is representative of a stock and OEM ITR powerplant ...


159 x (8/9) = 141.3 mph

Then again, if you had something like this and ran some longer gearing ...


... then you could top out in the true 170-180 mph range.

Car and Driver article from Josh's site of a 97 ITR (check the gearing/speed specs).
http://69.53.28.141/reviewArti....html

BTW -- The above turbo motor is for sale along with the tuned Hondata S200 unit, AVC-R (glove box mounted along with Greddy Warning meter EGT and Oil Temp), MSD, etc.

If interested please e-mail: Steve@sgt-racing.com about them since that's where the car was disassembled.

Thanks for putting up with my little sales pitch. Ed


Modified by zygspeed at 11:04 PM 1/26/2004

 

Are you saying that car would stop accelorating at 8000rpms?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Fat Bradstard &raquo;</TD></TR><TR><TD CLASS="quote">Are you saying that car would stop accelorating at 8000rpms?</TD></TR></TABLE>

Yes, unless it was going down a hill or had a nice tail wind.

I once did a true 124 mph in my fairly stock 1st Gen 87 CRX Si,
which was only supposed to have a top speed of 112 mph.

 

Thanks for all the good responses guys!Looks like I'm gonna be getting the ATS 4.9 after all.I've heard the 4.9 FD and Lightweight flywheel makes a really big difference in acceleration,but I was always worried about the top speed.Looks like I have nothing to worry about now,just glad I got a Mugen chipped obd1 ecu with a higher rev limit,so that helps out alot.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zygspeed &raquo;</TD></TR><TR><TD CLASS="quote">

Yes, unless it was going down a hill or had a nice tail wind.

I once did a true 124 mph in my fairly stock 1st Gen 87 CRX Si,
which was only supposed to have a top speed of 112 mph.</TD></TR></TABLE>

Just because power falls at a certain point doesn't mean the curve after it can't support increasing acceleration.

My R bounced the rev limiter in 5th gear laying down less than 173whp with 195/50 tires, a true calculated speed of 155mph by the way. It made peak power at 7,800rpm but sure as heck kept pulling past that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ActiveAero &raquo;</TD></TR><TR><TD CLASS="quote">Just because power falls at a certain point doesn't mean the curve after it can't support increasing acceleration.</TD></TR></TABLE>

Actually it does, simple physics wrt the power needed to counteract the aero drag of the car at that speed or higher (in top gear).

http://69.53.28.141/reviewArti....html

See page 4 in that article.