Ron,
Joe Klokkevold said the same thing yesterday before Mike even
replied with his 350 horsepower U20. Joe has alot of experience
with Datsun/Nissan engines. He said about the same thing you did.
although he even stated that the FJ20 is not a match for the SR20.
He felt that the cam timing chain was a weak link along with the
cast iron block casting. He felt that the U20 was good for around
250 horsepower. Normally aspirated ones around 210 with 13 to 1
pistons.
I tend to believe what he says. The U20 designers never intended
it to be a turbocharged power plant.
This is my opinion based on information I have received from various
other Datsun / Nissan owners.
I am not saying Mike's car doesn't produce a fair amount of power,
but I don't think it is 350. Didn't the VG30ETT only produce 320
horsepower.
Maybe now I will seriously consider an SR20 :-}
Mike
Ron Hamilton wrote:
> 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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