Mike;
Is this the U-20 turbo of yours that had the cobbled up single SU carb with a
welded together float bowl because it kept running out of gas? I have trouble
comparing the single overhead can two valve per cylinder, mile long cam chain,
old distributor technology that gets 350? horsepower with the FJ-20 that starts
out with 4 valves per,computerized ignition, fuel injected, dual overhead cams,
designed for charging to 25 lbs,175 horse stock motor that with custom equal
length exhaust header and new Mitsubishi 16G turbo with 9.5 lbs boost and the
numbers only come to approximately 305 horsepower. My math must be wrong! Must
be the fact that the FJ tachs to 8500 rpm +or is it the 3 inch throttle body
that isn't as good as the old welded up carb?
:-)
Ron
Mike Kerr wrote:
> <I'm curious as to how many of you are relying on speedometer readings and
> how many are actually calculating speed? Also, are you using a U20 or
> something else, and how did the car feel at top speed, handling
> wise...fairly secure or downright scary? Mine felt rather twitchy, >
>
> U20 motor but the turbo does and some extra HP over twice as much
> at 150 mph on the gauge (stock rear end 3:70 with stock dia tires)
> was pushing 7 lbs. boost to keep it at 150, the waste gate was set for 15
> lbs. but the turbo would push it to 17 to 18 lbs.., needed larger waste
> gate. the u20 breaths so well it gains hp with boost quite well.
> At 120 you could change lanes on a dime, at 150 i wasn't trying to do
> anything but go strait on the road. but it was not twitchy at all. I have
> the front dropped 2 inches and 66 rear springs this keeps the air on top of
> the hood pushing the front end down. I have driven some roadsters I
> wouldn't have wanted to go 80 mph in also.
>
> Mike Kerr
> Roadster Restoration
> 3730 Todrob LN.
> Placerville CA. 95667
> Ph.# 530-644-6777
> Fax# 530-644-7252
> E-mail: mikekerr@innercite.com
> Web page : http://www.innercite.com/~wolfgang
> Visa & master card
> -----Original Message-----
> From: Rob Robinson <FastrTime@t-three.com>
> To: datsun-roadsters@autox.team.net <datsun-roadsters@autox.team.net>
> Date: Tuesday, December 14, 1999 6:24 AM
> Subject: High velocity
>
> >I went for a speed run last Saturday just to see what my 2000 would do...I
> >hadn't tried a top speed run since prepping the car for CSP several years
> >ago and with all this talk of speed records...I just couldn't stand it!
> >Anyhow, I ran out of steam at 6350rpm in 5th, 3.89's, and 205/50/15. Works
> >out to about 133mph although the speedo (Autometer) said 142. The car
> >probably would have gone faster with 3.70's or larger diameter tires, as
> >6350rpm is a bit past peak hp. BTW, the 6350rpm figure is not a guess, it
> >was plucked from my fuel computer.
> >
> >I'm curious as to how many of you are relying on speedometer readings and
> >how many are actually calculating speed? Also, are you using a U20 or
> >something else, and how did the car feel at top speed, handling
> >wise...fairly secure or downright scary? Mine felt rather twitchy, but
> >that's expected of a car set up for under 60mph autocrossing. I don't think
> >I would have even attempted such a speed run with stock suspension/tires.
> >
> >Non-Roadster content: Anyone got an impressive personal top speed in a
> >non-roadster? I used to own a '70 240Z with a 13B rotary
> turbo...intercooler
> >filled the entire nose, header wrapped to the front of the engine where
> >there was room for the turbo, 3.54 viscous LSD (from a Q45) and 225/50/16.
> I
> >hit the rev limiter in 4th (8500rpm) and got scared. That calculated to
> >about 185mph, and it could have gone faster...with someone else driving it.
> >
> >
> >Rob Robinson
> >CSP 67 2000 (not Solexes...45mm throttle bodies)
> >Roanoke, VA
> >
> >
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