Top Speed in your Infiniti M?

[WCCBaLLeR]

Around 140 and i was on 22's. Rides sweet and handles great at high speeds.

[speedfreak786]

150 MPH yesterday morning on the 101 in CA.

[buhdda]

145ish

Anyone know if the 03-04 M45 or the 05-present m45 are faster?

[sr79labrat]

Yea...who would win? haha I think we are all on "the track" so to speak while it would be illegal to reach these speeds on public roads. Had the M45 to 110 on the track...and my Legend one to 140...on the track. Cant try to kill the new ride yet though I am sure I will some day. hahaKTW

[Popsickle]

When my friend was driving my drunk @$$ to his house (yager bombs all night w/dressed patrons) he hit around 145-150mph. He didn't tell me till the next week lol, but he made me feel better by saying he was toying with the last generation Mustang GT and a z28 *shrugs* He also passed a cop who didn't even flip his lights on :O I should have beat my friend senseless since he only drove like that in my IS300.D.

[oztiks]

Ive hit the 145-150 mark before but it's been a few months and i dont have pics/recording, on a particularly adventurous day I did record this and upload it though (~130):

http://video.google.com/videop...hl=en

It's clearer if you put it to into the non-zoomed mode.

[jbillion]

I recently took my M45 up to 135 on the Dan Ryan at about 4am. There was a lot of wind noise coming from above the windows and the tires were kind of loud. The ride was silky smooth though.

[maxnix]

Give or take a few mph the orginal Q45 sold in 1989 could achieve 140 mph in 3rd gear and 150-155 mph in 4th depending on ambient temperature and altitude..........a modified ecu and exhaust old Q with a decent engine [mileage] can attain 152-157 mph some might hit a real 160mph eventually.

Had a guy who worked at Infiniti corporate in the early days tell me he had a 1990 Q45 on either Phoenix or W Texas proving ground up to 160+ mph timed.

[NBP45]

You should only speed when your the only one on the road...its important to be considerate of other drivers that are being safe.....i hate when people speed through traffic

[szh]

You should only speed when your the only one on the road...its important to be considerate of other drivers that are being safe.....i hate when people speed through traffic

Totally agreed. Always be safe and courteous.

Like I said earlier in this thread:

I agree entirely with you! Driving fast in heavy traffic is downright dangerous and irresponsible. I am always careful to be on way open roads before I do anything like that!

Z

[450GT]

I did 155mph in 4th gear .

[ArbitrageMan]

Im lucky if I break 70 around here. Its rare. Really rare.

I think one saturday I hit 110 but thats it. Its the record for the slowest, fastest Ive driven a car that Ive owned.

[M35 Sport]

About 120 chasing what I call a boy racer in an Dodge Caliber SRT-4 He could not leave me.

[ken in az]

When I bought my car last october we drove it from IL back to phoenix. My girl was driving, I was riding shotgun with my laptop and air card probably searching this forum and I noticed that the wind noise had increased a little. I looked up and asked how fast we were going and she said 120mph. I put my head back down and kept searching the internet - lol

I don't like top speed runs....I like to do onramp wot runs....fatsest I got on an onramp was 110mph-ish - I'm sure I've gone faster but I pay attention to the road not the speedo when I'm going that fast. In my old turbo 300zx I wrapped the speedo all the way around past the 145mph mark and hit my shift light at 6800rpm in 5th gear. I did the math and I was going 167mph. Only reason I know is because it was videotaped.

[YMm45]

i got up in the high 150's not to long ago heading back from orlando to tampa it was like 4am so the roads were clear it was me and a friend in a cls500 it was a very smooth ride for those speeds

[450GT]

Yesterday i did my first speed run after Rev limit changed to 7500rpm . I did285 km/h. Finally yeah i didnot know it had all hidden potential.

[ken in az]

Yesterday i did my first speed run after Rev limit changed to 7500rpm . I did285 km/h. Finally yeah i didnot know it had all hidden potential.

Holy Crap! that's 176mph!!! How is your Mines ECU? how long was shipping? is the rest of your car stock meaning intake and exhaust? Since you are overseas do you know what your rear differential ratio is?

2 words......Awesome!

[450GT]

My car is stock without any modification but the ecu is from mine`s . Mines ecu changed the rev limiter from 6800 rpm to 7250 rpm .But , i took the ecu to a special car computer specialist and changed the rev limit to 7500 rpm. Actually the car was able to go for more speed but the road have a speed camera .

[YMm45]

okay let me get a grip on this there is a company that makes a ecu for this car or do they just add a chip to your current ecu and where is this company at did you have to ship your ecu away and wait for them to send back sorry about all the questions just never heard about anything like this for this car and would like to know more

[ken in az]

okay let me get a grip on this there is a company that makes a ecu for this car or do they just add a chip to your current ecu and where is this company at did you have to ship your ecu away and wait for them to send back sorry about all the questions just never heard about anything like this for this car and would like to know more

He's in Bahrain which is overseas. Correct me if I'm wrong 450GT - He ordered a Mines ECU from japan and then found someone to tune it for more rpms.

[YMm45]

okay thank you for the info what is the importing process i have had a motor come from japan once but it was at the port for like 4 weeks is it something like that for shipping and any clue on price and who to contact to order one any one in the united states running one in there car

[450GT]

You can say that. You call them i told them where i live and what i need. They it is difficult because a problem which they say that i can not installed it without a professional. What i did is told to send it by DHL to my address and told them i do what they told me. I told my friends about the problem . one of them said that he know someone which is elctrical / electronic specialist in nissan cars. I went there and said yes i can install that but do you need me to upgrade the new ecu . After thinking i said yes

[450GT]

Go to a specialist and they might help you to decode the original ecu if you don`t want to buy the mine`s ecu and tell them to remove the speed limiter if he can . The specialist I went for . Told me give chance to decode your original ecu but i told him no . But he said that the original ecu can go to 280km/h and more without speed limit. My friend told me that blitz made a flash to original ecu and do what ever you want to do. But i don`t recommand it can damage your engine if made tuneing wrong.

[M4T5]

Take your M to UpRev and have them do it the right way!They have all the tuning knowledge, tools, chassis dynometer, and codecs needed to tune the Infiniti ECU's as needed.

Give them a call and see what they can do for your specific ride. They specialize in tuning Nissan vehicles.

J

[ken in az]

Take your M to UpRev and have them do it the right way!They have all the tuning knowledge, tools, chassis dynometer, and codecs needed to tune the Infiniti ECU's as needed.

Give them a call and see what they can do for your specific ride. They specialize in tuning Nissan vehicles.

J

I just called UpRev and they said my ECU was patched and ready but the real time tuning hadn't been added yet. They said they are super busy with a ton of projects but hope to get mine done this week and ready for tuning next week. I expect alot of power to be added, but only time will see.

My advise is to wait till I'm done, then call with a fury to uprev so they can add it as a product line. They can tune any nissan/infiniti so it doesn't matter m35 or m45 - call!! I'm adding boost as soon as possibleas long as the stock fuel system can take it.

[YMm45]

what is uprev charging for the reflash and tune and also where are they located at

[tigerclaws1318]

I did 155mph in 4th gear .

4th Gear tops out at 130mph and I would know cause thats the gear I ran it in when doing my dyno pulls. lol

[Johntomferg]

4th Gear tops out at 130mph and I would know cause thats the gear I ran it in when doing my dyno pulls. lol

Not validating his claim, but if you run the gear ratios (available from here http://blogs.thecarconnection....specs) and tire size through gearcalc (available from here http://www.locost7.info/gearcalc.php )

4th gear is close to 6000 RPM @ 150

Theorectically possible, of course gear calc doesn't adjust for coefficient of friction or tire deflection (which impacts rotation diameter)

Output:

GearCalc v2.0.0.3 Copyright ©2001, Peter Ogden Gear Ratio, Speed and RPM Calculator

Gear set: Manually entered values Gear 1 2 3 4 5 Final Ratios: 3.540 2.260 1.470 1.000 0.830 3.130

RPM Limit: 7000 RPM @Peak Power: 6400 Tyre Size: 235/45 x 18 Tyre Diameter: 26.33 in Tyre Circumference: 82.72 in

Gear Mph per 1000 RPM Mph @6400 RPM Mph @7000 RPM -------------------------------------------------------- 1 7.07 45 49 2 11.07 71 78 3 17.02 109 119 4 25.03 160 175 5 30.15 193 211 Mph RPM (in Gears) ------------------------------------------------- 1 2 3 4 5 ------------------------------------------------- 5 707 452 294 200 166 10 1415 903 587 400 332 15 2122 1355 881 599 497 20 2829 1806 1175 799 663 25 3536 2258 1468 999 829 30 4244 2709 1762 1199 995 35 4951 3161 2056 1399 1161 40 5658 3612 2350 1598 1327 45 6365 4064 2643 1798 1492 50 ........ 4515 2937 1998 1658 55 ........ 4967 3231 2198 1824 60 ........ 5418 3524 2398 1990 65 ........ 5870 3818 2597 2156 70 ........ 6321 4112 2797 2322 75 ........ 6773 4405 2997 2487 80 ........ ........ 4699 3197 2653 85 ........ ........ 4993 3396 2819 90 ........ ........ 5286 3596 2985 95 ........ ........ 5580 3796 3151 100 ........ ........ 5874 3996 3317 105 ........ ........ 6168 4196 3482 110 ........ ........ 6461 4395 3648 115 ........ ........ 6755 4595 3814 120 ........ ........ ...... 4795 3980 125 ........ ........ ...... 4995 4146 130 ........ ........ ...... 5195 4312 135 ........ ........ ...... 5394 4477 140 ........ ........ ...... 5594 4643 145 ........ ........ ...... 5794 4809 150 ........ ........ ...... 5994 4975 155 ........ ........ ...... 6194 5141 160 ........ ........ ...... 6393 5306 (...) Gear Change RPM drop (change @6400) RPM drop (change @7000) ------------------------------------------------------------- 1 -> 2 -2314 (to 4086) -2531 (to 4469) 2 -> 3 -2237 (to 4163) -2447 (to 4553) 3 -> 4 -2046 (to 4354) -2238 (to 4762) 4 -> 5 -1088 (to 5312) -1190 (to 5810)

Modified by Johntomferg at 2:09 AM 4/23/2009
Modified by Johntomferg at 2:37 AM 4/23/2009

[oztiks]

http://www.caranddriver.com/co...5.pdf

DRIVETRAINTransmission . . . . . 5-speed automatic with manumatic shiftingFinal-drive ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.36:1Gear Ratio Mph/1000 rpm Max test speedI 3.83 6.0 40 mph (6600 rpm)II 2.37 9.7 64 mph (6600 rpm)III 1.52 15.2 102 mph (6600 rpm)IV 1.00 23.1 152 mph (6600 rpm)V 0.83 27 .8 155 mph (5600 rpm)

From my experience, the car would shift into 5th at about 140 when in automatic mode. If you were in manual-shift mode, I think I could hold it until about 145-150 (per speedometer)... it DEFINITELY hit 5th gear before the speed limiter.

[Johntomferg]

http://www.caranddriver.com/co...5.pdf

DRIVETRAINTransmission . . . . . 5-speed automatic with manumatic shiftingFinal-drive ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.36:1Gear Ratio Mph/1000 rpm Max test speedI 3.83 6.0 40 mph (6600 rpm)II 2.37 9.7 64 mph (6600 rpm)III 1.52 15.2 102 mph (6600 rpm)IV 1.00 23.1 152 mph (6600 rpm)V 0.83 27 .8 155 mph (5600 rpm)

From my experience, the car would shift into 5th at about 140 when in automatic mode. If you were in manual-shift mode, I think I could hold it until about 145-150 (per speedometer)... it DEFINITELY hit 5th gear before the speed limiter.

Oops! thanks for the ratio corrections, for some reason I thought he had the prior gen... thanks!