first gen q45 top speed?

[maxnix]

The original LS400 was good for 150 mph with a slight downhill run or near perfect sea level conditions. The G50 had to be good for 155 - 160 mph under similar conditions, but the gearing and drag would prevent anything over that.

If I ever get the right tires and brakes, must drive in the Siver State in Nevada once.

[jamesmost]

you guys,what is the top speed of a non speed limited first gen q45?a few of you have the jwt ecu,what has your top speed been?thanks.of course,i would like to know the q45 weight,as well.i know i could probably search for this stuff,but,hell,i would like to discuss it.450zxttvh45dett power,baby.

Slim what up ? hope all is well. I have had my Q up to 160 was told limiter removed will hit 180 @ redline.

[maxnix]

I have had my Q up to 160 was told limiter removed will hit 180 @ redline.

Won't pull redline in OD, so big if.

[jamesmost]

didn't one of the origional articles on the Q have it doing laps (i think @ limerock) @ 180mph?

[PoorManQ45]

well, why doesn't someone put their car on the rollers(dyno) and find out what the none drag limited top speed really is?

Want to increase the Top speed limiter? Put larger then OEM tires on

Oh, what's this? I talked about having my Q up to ~150~155 about 11 months ago. IIRC ALL of you said I was lying.

[maxnix]

well, why doesn't someone put their car on the rollers(dyno) and find out what the none drag limited top speed really is?

Want to increase the Top speed limiter? Put larger then OEM tires on

Oh, what's this? I talked about having my Q up to ~150~155 about 11 months ago. IIRC ALL of you said I was lying.

Gee, PMQ45, what makes you think aerodynamic drag would affect top speed?

[szh]

Want to increase the Top speed limiter? Put larger then OEM tires on

Oh, what's this? I talked about having my Q up to ~150~155 about 11 months ago. IIRC ALL of you said I was lying.

As I also recall, weren't you also running tires that were 2" smaller in diameter than OEM?

Z

[maxnix]

As I also recall, weren't you also running tires that were 2" smaller in diameter than OEM?

Z

How do you think he got it to indicate 150 mph?

Personally, I was holding out for the cliff.

[spankme234]

Ive gone up to and a little past 145 on two occasions in my stock 1991. I took a glance down at the speedo which was at 145 and climbing but tried to keep my eyes concetrated on the road so i didnt look at the rpms. I think a stock Q can top out at 150-155.

[rsiwicki]

you all must have some very very long and traffic free roads....the Q is fast but not that damn fast, especially after 135mph it slows down a lot considering both wind factor and the gearing.

before my mods I only had the Q up to 125 once or twice over a 6+ year period of ownership. It took way too long to get up to those speeds and then have adequate room to bring it back down to normal safer speeds. After all my mods I can hit 140+mph it a heart beat compared to a stock Q...but still need a long stretch of highway and have the balls to do it as well. My car now daily sees above 100mph going across the causeway on the way home from work....but still need good room to do it not to mention that I will not do it unless I know the car is perfectly running with good tires.

[PoorManQ45]

As I also recall, weren't you also running tires that were 2" smaller in diameter than OEM?

Z

hehe, yep. Higher total gear ratio = better acceleration

The speedo is off by ~8%. At a rated 155mph that'd still be 142.6mph. Note that doesn't include tire expansion which may put it closer to 144mph.

Gee, PMQ45, what makes you think aerodynamic drag would affect top speed?

Yep, it would indeed.

Lets assume a tail wind. That'd decrease drag a bit.

What is the theoretical top speed of the Q given max RPM and 4th gear?

[Q45denver]

What is the theoretical top speed of the Q given max RPM and 4th gear?

[/QUOTE]

About 224 mph at 7300 rpm but you need about 800 hp to get there.

http://www.popularmechanics.co...2&c=y

[PoorManQ45]

Ah, good find. I've never actually seen pictures of the engine that was in the speed record car.

Any idea what the drag limited speed would be with a 2in lowered Q with a real body kit and under car aerodynamics reworked to reduce drag? I would think that in the right conditions the stock engine *could* hit 170~180

[Q45Racing]

Ive had my Q up to 145 a couple of time, other wise stock, CAI and it still had more power to go..... I thought a guy here in florida got caught in a Q at 180mph was in the news and forum in the past.

[Jesda]

well, why doesn't someone put their car on the rollers(dyno) and find out what the none drag limited top speed really is?

Want to increase the Top speed limiter? Put larger then OEM tires on

Oh, what's this? I talked about having my Q up to ~150~155 about 11 months ago. IIRC ALL of you said I was lying.

You said 170, not 155.

It took about 5 miles for me to reach 160. Then I went over an overpass and on the way down the speedo bounced off of 170. When I was back on level road, the speedometer stayed at ~170.

[PoorManQ45]

You said 170, not 155.

That is correct. The speedo does go past 160, it's just not numbered

[Altiman94]

so all this talk about the Q cruising along effortless at 160+ mph is impossible considering the top speed is 10 mph less than that. Finally, the truth comes out.

[PoorManQ45]

haha, I don't like people like you altiman. You fine one fault in a conversation and then you will raise a flag stating somethihng like, "you lied" and then you'll try to discredit everything

[rsiwicki]

I am not a lawyer.....but what you just said about Altiman94 is exactly the kind of lawyer you would want defending you to put any sort of doubt into the jury's mind

[PoorManQ45]

Agreed, bu thta't snot the point.

He's going to wave the "you lied" flag in Performance oriented Q45 threads

[Altiman94]

I didn't know they were even performance oriented. Every luxo car has a mildly powerful engine, so it's not like one is better than the other anyhow.

[Jesda]

In theory, only the early production 1990 Q45s can reach 160mph in ideal conditions.

Why? There was no speed limiter.

[Jesda]

I didn't know they were even performance oriented. Every luxo car has a mildly powerful engine, so it's not like one is better than the other anyhow.

He's referring to the thread, as$hat.

[Rex]

so all this talk about the Q cruising along effortless at 160+ mph is impossible considering the top speed is 10 mph less than that. Finally, the truth comes out.

It like the 240 (a sports car) is electronically limited, but with an ECU swap, the "limit" is removed and the topspeed is higher.

[Rex]

I didn't know they were even performance oriented. Every luxo car has a mildly powerful engine, so it's not like one is better than the other anyhow.

How many of them have a V8 with a redline north of 6500 RPMs stock, the ECU takes it to >7k, if you're willing.

[450zxtt]

well,the vh45de will motivate a z much faster...450zxttvh45dett power,baby.

[elwesso]

I dont know of any other V8s that were put in any car within 5 years of the last VH45DE in america (1996) that went to 7000 stock, and 7300 with chip....

[96Qowner]

I talked to the owner of T3 last week and he said he'd had a G50 with JWT ECU and Tri-Mode up to 169, with a feeling that it had more in it. I quizzed him about air resistance limitations and he said no, it had more. I didn't think until later about the speedometer. Maybe he was estimating from the tach. But he was insistant - 169 mph.

[q man bk]

comin from fl 2 ny got it up 2 152 on the clock nocomp upgrades, I had thermostate out, it was about 94 noticed the temp gauge quickly rising had to back off the gas! no complaints

[TgduMg]

The early 90's Q45 is a former record holder of the Land Speed Authority Class 3, Engine Category 2, Engine Class Size 12, unsupercharged gasoline record at 163 mph by deactivation of the speed limiter according to plaque at the bottom of this page.

I thought that I saw this originally on Nico a few years back.

169 mph with a JWT ECU doesn't seem at all farfetched to me one bit.

BTW, the Ford guys did a little more than deactivate the speed limiter on the Mark VIII.



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