Re: UPDATE, Swapped to carb to rule out ignition.. and pseudo-intro..

[olbap <olbap@mail.mia.bellsouth.net>]

 Interesting, the only thing is that im using a very short runner intake and
despite even a very small throttle body it should pull strongly up to
ATLEAST 5500 yet it does not with the tbi.. the only theory I have i just
posted to the list.  

I also have a complete TPI setup from an 87 LB9, but because the motor was
built with high rpm in mind( heads and cam), I dont plan on using it.

Pablo





At 06:56 PM 5/31/00 EDT, you wrote:
>I have only converted one car from carbs to FI.  It was a Jag straight 6 from 
>two 2inch SUs to port injection.  Low end grunt improved (according to the 
>butt-o-meter) and 'around town' fuel economy improved dramatically.  But the 
>top end did not feel nearly as quick (again, according to the butt-o-meter.)  
>And I used to get rubber in second, and never got it with FI.  Yet, my 
>stop-watch timing to 60mph showed a good 1-second quicker (the low end grunt, 
>maybe?)
>But I really missed that top end screaming that put you back in the seat 
>(well, relatively speaking, given the 4200 lb sedan with a 6cyl).
>It wasn't a restrictive throttle body ( 3 inch) or to small injectors (24lb). 
> It just seemed the nature of the FI.  Maybe it's the long runners, I don't 
>know.
>Now I have a Chevy v8 that I am going to switch to TPI.  This car pulls real 
>hard on the highway, but is kinda wimpy in first gear (stumbles a lot, I 
>don't know why).  I'm hoping I get the Fuel economy gains and the low end 
>grunt, but I will be very disappointed if I lose the high end pull.  (and by 
>high end pull, I mean from 3500rpm to 5000rpm.  The auto. doesn't really let 
>it do much more than that, and I'm going 100mph by then anyway!)  Also, 
>basically stock engine ('75 L48 with a 4 bbl.)  It was rebuilt at some time, 
>so maybe it is slightly hotter than stock, but has a smooth idle and 
>absolutely stock on the outside.  0-60 is about 9 seconds (when it doesn't 
>stumble to much in first gear) but 60 to 80 is 5 seconds flat, which is 
>pretty quick.  1/8 is 10.3 at 69mph (it's only just starting to get moving!)
>So to sum up, my experience so far has been similar to yours.  I hope the 
>trend doesn't continue with my TPI.  Maybe someone on this list knows why 
>this is, or can just tell us to stop using the But-o-meters?
>Ted
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